MUNICIPAL BOND PRICING TEACHING DASHBOARD — ILLUSTRATIVE $1,000,000,000 GENERAL OBLIGATION SERIES 20XX

This note answers four questions every municipal treasurer, finance director, and elected official should be able to answer about bond premiums:

1. Have premiums always been part of municipal bond issuance?
2. Why did premium structure become the dominant convention in the late 2000s?
3. When is an intentional premium the right structural choice?
4. When is the premium too high — and how do you recognize that line?

The short answers, before we dig in:

• No — premiums in their modern, structurally-engineered form are roughly a fifteen-year-old phenomenon. Before about 2008–2010, par bonds were dominant. Premium issuance existed but was incidental rather than intentional.
• The shift was driven by the convergence of three forces: the de minimis tax rule (which penalizes discount bonds), the Build America Bonds program (2009–2010) (which forced the muni market to develop sophisticated coupon-structuring practices), and investor preference for tax-exempt income over price appreciation (a structural feature of the U.S. tax code).
• A premium is right when it accomplishes a specific structural goal: covering cost of issuance without raising par, funding capitalized interest during construction, building a debt service reserve, or supplementing the project fund. The premium becomes a tool for delivering full proceeds against a fixed authorization.
• A premium is too high when it produces more proceeds than the project reasonably needs (IRS arbitrage limits), exceeds voter authorization in spirit, creates refunding inefficiencies, generates political optics problems (typically above 10–12% of par), or creates significant divergence between TIC and All-In TIC.

The remainder of this note develops these answers in technical depth, with worked examples drawn from current Texas municipal practice, including the proposed the Issuer Series 20XX $1 billion issuance referenced throughout as a case study.

Par, Discount, Premium

A bond's price relative to its face value (par) is a direct mathematical consequence of the relationship between its coupon rate and the prevailing market yield at the time of pricing:

• If coupon = market yield → bond prices at par ($100)
• If coupon < market yield → bond prices at a discount (below $100)
• If coupon > market yield → bond prices at a premium (above $100)

This is not optional or discretionary — it is forced by the time value of money. Two bonds with identical risk, maturity, and liquidity must produce the same total return. If one promises a higher coupon, its price must rise until the yield-to-maturity equals the market rate. The premium is, in effect, the bondholder pre-paying for the right to receive higher coupon income.

The Critical Distinction — Incidental vs Intentional Premium

Modern municipal bond issuance distinguishes between two very different premium phenomena:

This distinction matters enormously for understanding the historical arc. When market participants today refer to "premium bonds," they are almost always referring to the intentional kind. The structural conventions that govern how premium is used, sized, and allocated are products of the post-2008 era.

Premiums on municipal bonds have existed as long as municipal bonds themselves. What has changed dramatically over the last forty years is the role they play in the structural economics of an issue.

Era 1: Before 1986 — The Par-Bond Era

Prior to the Tax Reform Act of 1986, the municipal market was dominated by par bonds — securities issued with coupon rates set at or very near the prevailing market yield, producing prices around $100. The reasons were practical:

• Most bondholders were natural-person investors holding individual bonds, often to maturity. Calculating yield-to-maturity on a non-par bond was awkward and not always trusted.
• Tax treatment of premium and discount was less developed. The IRS code had not yet articulated the modern framework for tax-exempt premium amortization or original issue discount accretion.
• Issuance technology — the underwriter's ability to price and place differentiated coupon structures — was less sophisticated than today.

In this era, a bond at $98 or $102 was unremarkable, but a bond at $108 or $112 would have been highly unusual and structurally suspect. Premiums and discounts of any size were primarily incidental — the residual difference between the issuer's chosen coupon (often a round number like 5.0%, 5.5%, or 6.0%) and the actual market yield on pricing day.

Era 2: 1986–2000 — The Transition Period

The Tax Reform Act of 1986 reshaped the U.S. tax code in ways that directly affected the municipal market. Key changes included:

• Limits on bank-qualified bonds (capping the volume of bonds that financial institutions could deduct interest expense to carry).
• Restrictions on private activity bonds and tightened arbitrage rebate rules.
• More articulated treatment of original issue discount (OID) for tax purposes.

During this period, premium issuance grew slowly. Underwriters began experimenting with premium coupons on longer maturities to attract income-seeking buyers, but the practice was not yet standardized. Par bonds remained common, especially for shorter-maturity series and smaller issuers.

Era 3: 2000–2008 — Mixed Structures

The early 2000s saw greater experimentation. Issuers began using premium coupons more strategically — particularly for the long end of new issues, where institutional buyers (mutual funds, insurance companies) were the primary market and preferred the higher cash flow that premium coupons delivered. However, par bonds were still heavily used for retail-targeted serials.

Notably, this is also the period when zero-coupon bonds (capital appreciation bonds, or CABs) saw heavy use — particularly by Texas school districts. Zeros are the structural opposite of premium bonds and represent a different solution to the same fundamental problem: matching debt service cash flows to project economics.

Era 4: 2008–2015 — The Great Convergence

This is the era during which premium bonds became the dominant structural convention. Three concurrent developments drove the change, which we examine in detail in the next section.

Era 5: 2015–Present — The 5% Coupon Era

By 2015, the convention had crystallized: investment-grade municipal bonds are priced to a 5% coupon, with yield to maturity adjusted via premium dollars. This is now the assumption underlying the major AAA yield curves (MMD, BVAL, ICE, Tradeweb), all of which are constructed assuming a 5% coupon and a 10-year par call for tenors beyond 10 years.

As of late 2025, premium bond structures account for approximately 90% of investment-grade municipal bond issuance by par amount. Par bonds are now the exception, typically reserved for short-maturity refunding bonds, certain bank-placement structures, or unusual transactions where investor preferences explicitly favor par pricing.

Three forces converged in this period to transform premium issuance from a niche practice into the market default. Understanding all three is essential, because each operates through a different mechanism and each contributes to why the convention has proven so durable.

Force 1: The De Minimis Tax Rule

This is the single most important driver. The de minimis rule, codified in IRC Section 1278 and implementing regulations, governs how the IRS taxes the difference between a bond's purchase price and its face value at maturity for bonds purchased at a discount in the secondary market.

The mechanics:

• If a tax-exempt bond is purchased at a discount of more than 0.25% per year of remaining life from par, the gain on accretion to par at maturity is taxed as ordinary income, not tax-favored capital gains.
• On a 30-year bond, this means a discount of more than 7.5% (30 years × 0.25%) below par triggers ordinary income treatment.
• On a 10-year bond, the threshold is 2.5% below par.

The implication: when interest rates rise, par and discount bonds risk falling into the de minimis zone, dramatically reducing their after-tax value to investors. Premium bonds, by contrast, have a built-in "cushion" — a $108 bond would have to fall by more than 8% just to reach par, providing significant insulation against rate-rise scenarios.

This created a structural investor preference for premium bonds that issuers could not ignore. By the early 2010s, asset managers were explicitly screening out par and discount structures in their bid evaluations. Underwriters responded by pricing new issues to premium coupons as the default.

Force 2: Build America Bonds (2009–2010)

The Build America Bonds (BAB) program, created under the American Recovery and Reinvestment Act of 2009, allowed state and local governments to issue taxable bonds with a federal subsidy of 35% of the interest cost. Approximately $181 billion of BABs were issued during the 18-month program window.

BABs forced the muni market to develop sophisticated coupon-structuring practices in two ways:

• BABs were taxable bonds and had to compete with the corporate bond market on an apples-to-apples basis. This required sophisticated coupon engineering to produce attractive yields-to-maturity for investors who were not benefiting from tax exemption.
• When BABs expired in late 2010, the muni market retained the structural infrastructure — the spreadsheet models, the underwriter expertise, the investor familiarity — that had been built up to handle premium-coupon transactions. This infrastructure carried over directly into tax-exempt issuance.

In effect, BABs trained an entire generation of underwriters and issuers in how to think about coupon as a structural variable rather than a fixed input. After 2010, this training was redeployed in the tax-exempt market, accelerating the adoption of premium structures.

Force 3: The Tax-Exempt Income Premium

The U.S. tax code creates a structural advantage for tax-exempt coupon income relative to tax-favored capital gains, which is amplified at higher tax brackets. The mechanics:

• $1 of tax-exempt coupon income avoids federal income tax entirely (and often state and local income tax in the issuer's state).
• $1 of long-term capital gain on a tax-exempt bond is still subject to long-term capital gains tax (currently 15–20% federal plus 3.8% net investment income tax for high earners).

The arithmetic favors more coupon income and less price appreciation. A 5% coupon bond delivers more annual cash flow to an investor than a 3% coupon bond — even though the yield to maturity is identical — and that cash flow is fully tax-exempt rather than partially tax-favored.

Aware of this advantage, issuers and their advisors had every incentive to structure deals with high coupons. As more issuers did so, the practice became self-reinforcing: institutional investors built portfolios around premium coupons, and any new par-coupon issue began to look anomalous and less liquid.

Why the Convergence Was Durable

The three forces above are not independent — they reinforce each other. The de minimis rule makes investors prefer premium structures. The tax-exempt income advantage makes premium structures economically efficient. BABs provided the operational infrastructure to deliver premium structures at scale. Together, they made premium issuance not just attractive but structurally inevitable.

Importantly, none of the three forces is likely to reverse. The de minimis rule is embedded in the Internal Revenue Code and would require legislation to modify. The tax-exempt income preference is structural to the U.S. progressive tax system. The operational infrastructure exists and won't be unbuilt. Premium issuance is here to stay.

Premium bonds intersect with the tax code in three critical ways. Each is technical, but each is essential to understanding why the structure works the way it does.

1. The De Minimis Rule (IRC §1278)

Already discussed above. To summarize the mechanics for clarity:

• Threshold: 0.25% of par per remaining year of bond life. Below this discount, accretion is taxed as long-term capital gain. Above this discount, accretion is taxed as ordinary income.
• Effect on premium bonds: Premium bonds, by their nature, are insulated from de minimis treatment because they trade above par. A bond purchased at $108 cannot fall into the de minimis zone unless its market price first falls to par — and even then, the de minimis cushion (e.g., 7.5% on a 30-year bond) provides additional protection.

2. Premium Amortization for Tax-Exempt Bonds (IRC §171)

When an investor purchases a tax-exempt municipal bond at a premium, IRC Section 171 requires the investor to amortize the premium over the life of the bond. This amortization reduces the bond's tax basis — but does NOT produce a deductible loss. The premium is essentially treated as additional cost of acquiring the tax-exempt income stream.

The practical effect: an investor who buys a 30-year bond at $108 and holds to maturity does NOT suffer a $8 capital loss, because the tax basis has been amortized down to par over the holding period. This is the technical basis for the often-stated principle that "premium bondholders do not lose the premium at maturity."

3. Issuer-Side Treatment — Premium as Bond Proceeds

From the issuer's perspective, premium received at issuance is treated as bond proceeds for federal tax purposes. This is consequential in three ways:

• Spending tests: All bond proceeds — including premium — must satisfy the IRS reasonable expectation test, which generally requires the issuer to spend the money for governmental purposes within three years of issuance.
• Arbitrage rebate: Premium proceeds invested above the bond yield while waiting to be spent generate arbitrage that may need to be rebated to the federal government. This is a significant compliance issue for large premium issuances.
• Use of proceeds: Premium proceeds must be used for the same governmental purposes as par proceeds. They cannot be diverted to operating expenses or non-bond-related uses.

These constraints place a hard upper limit on how much premium an issuer can responsibly capture. We address this in detail in Section VIII.

The technical mechanics of bond premium can be derived from first principles. This section works through the core equations and provides numerical examples for clarity.

The Bond Pricing Equation

The price of a fixed-coupon bond with semi-annual payments is the present value of all future cash flows discounted at the market yield:

Where:

• C = semi-annual coupon payment per $100 of par (for a 5% annual coupon, C = $2.50)
• y = semi-annual yield (annual yield / 2)
• n = number of semi-annual periods to maturity
• t = each individual semi-annual period from 1 to n

This can be rewritten using the closed-form annuity formula:

This is the equation used throughout the the Issuer Pricing Dashboard and in every professional bond pricing system. It tells you that the price of a bond is uniquely determined by three inputs — coupon, yield, and maturity — given the convention of semi-annual interest with 30/360 day count.

The Premium-Yield Sensitivity Relationship

How much does a bond's price change for a 1 basis point change in yield? This sensitivity is called the dollar duration or DV01 (dollar value of one basis point), and for a 5% coupon, 30-year, callable-at-10 muni bond, it is approximately $0.79 per $100 of par per basis point.

Stated differently: a 100 basis point shift in market yields produces approximately a $7.90 change in price per $100 of par on a long-maturity premium bond. This is why timing matters so much in the issuance window — a deal sized at $1 billion par moves by $7,900,000 in premium for every 1% movement in market rates.

Worked Example: The 5% Coupon Convention in Action

Consider a hypothetical 30-year municipal bond issued today with a 5% coupon. The market yield to call (10 years) is 4.27%. What is the bond's price?

On a $50,000,000 par issue, this single maturity would generate $2,940,000 of premium. Across a 30-year level-debt-service issuance, similar arithmetic applied to each maturity produces the total deal premium.

The Sensitivity to Coupon Choice

Why a 5% coupon? Why not 4% or 6%? The choice is a balance among three forces:

• Higher coupon = larger premium dollar amount = more proceeds to fund the project. But also higher annual debt service obligation.
• Lower coupon = smaller premium = less cushion against the de minimis zone. But also lower annual debt service.
• 5% has emerged as the convention because it produces a meaningful premium (typically 5–12% of par) on a 30-year bond at any reasonable rate environment, while keeping debt service requirements at a level most issuers can afford.

An intentional premium is the right structural choice when it accomplishes one or more specific goals. The goals are, in rough order of how commonly they justify premium use:

Goal 1 — Cover Cost of Issuance Without Raising Par

This is the most common rationale and the one easiest to defend politically. A typical $50 million general obligation bond issuance carries cost of issuance (COI) of approximately $400,000 to $700,000. If the issuer needs to deliver a full $50 million to the project fund:

• Without premium: issue $50,500,000 par to leave $50 million net for the project after COI. Voters' authorization is consumed at a higher rate.
• With premium: issue $50,000,000 par at $101.40, generating $700,000 of premium that covers COI. Voters' authorization is consumed at exactly the par level approved.

The premium structure is more transparent to voters and avoids the appearance that issuance fees inflate authorization. Almost every Texas city using GO bonds today employs a small premium for this purpose.

Goal 2 — Fund Capitalized Interest During Construction

Long-construction projects (jails, hospitals, transit lines, large facilities) often cannot generate operating revenue or tax collections during their construction phase. To bridge this gap, issuers fund debt service from bond proceeds — capitalized interest, or "cap-i."

For the the Issuer $1 billion Series 20XX jail financing, with construction running through 2029, capitalized interest could easily run $200–400 million. Funding this entirely from premium reduces the need to issue additional par.

Goal 3 — Build a Debt Service Reserve Fund (DSRF)

Revenue bonds typically require a debt service reserve fund equal to one year of debt service. For a $1 billion deal with $65.8 million annual debt service, the DSRF would be approximately $65.8 million. Premium can fund this reserve without adding to par.

Goal 4 — Project Fund Supplement

In some cases, premium is used to supplement the project fund directly — increasing the dollars available for construction beyond what par alone would provide. This is acceptable when the project has clearly defined uses that exceed initial par estimates.

Goal 5 — All-In TIC Optimization

In some interest rate environments, premium structures produce a lower All-In True Interest Cost than par structures with otherwise identical economics, because of investor preferences and liquidity premiums. This is sometimes the determining factor in coupon choice.

The Goldilocks Range

For Texas municipal issuers in the 2025–2026 rate environment, the practical Goldilocks range for premium as a percentage of par is:

These ranges are not regulatory limits — they are practical guidelines based on observed market practice. An issuer with strong technical justification can defend premium outside these ranges, but should expect to do so explicitly.

There is no statutory ceiling on premium. The IRS does not say "premium cannot exceed X% of par." Instead, there are five practical limits, and any one of them can render a premium "too high." All five should be evaluated for any deal contemplating premium above the standard 3–7% range.

Limit 1 — IRS Bond Proceeds Rules (The Hard Ceiling)

Under federal tax law, bond proceeds must be reasonably needed for the governmental purpose of the issue. The "reasonable expectation test" requires the issuer to spend approximately 85% of net sale proceeds within three years of issuance. Premium dollars count as proceeds.

If the issuer over-premium and ends up with cash that simply sits unspent, two problems emerge:

• Arbitrage rebate liability: investments earning above the bond yield must be rebated to Treasury, which is administratively expensive.
• In extreme cases, failure of the reasonable expectation test can jeopardize tax-exempt status, which would be catastrophic.

Rule of thumb: a premium that produces more proceeds than the project actually needs is too high — full stop.

Limit 2 — Voter Authorization (The Legal Ceiling)

Texas voters authorize a specific par amount when they approve a bond election. The legal question is whether issuance of premium dollars beyond the authorized par exceeds the authorization.

Most Texas bond counsel takes the position that premium is part of the consideration paid for the par bonds and therefore does not violate the authorization. However:

• Some bond counsel will flag premium above 5–10% of par for explicit board discussion.
• Politically, when a $200 million authorization delivers $230 million of cash to the issuer, the headline writes itself: "City Borrows More Than Voters Approved."
• Some Texas cities have started including disclosure about expected premium in their bond election ballot language.

Rule of thumb: when premium exceeds 10% of par, the issuer should explicitly document the structural rationale and consider proactive disclosure to elected officials.

Limit 3 — Refunding Economics (The Strategic Ceiling)

Premium structures interact with refunding economics in ways that issuers don't always appreciate at the time of original issuance. The basic relationship:

• A 5% coupon bond is more attractive to refund than a 3% coupon bond, because there is more interest cost to save in a lower-rate environment.
• But the higher original coupon means the issuer has "pre-paid" value to investors via the original premium. That value is not recoverable through refunding.
• Net effect: premium structures provide more refunding optionality but at a cost. The break-even refunding rate is higher than for par bonds.

Rule of thumb: an issuer who anticipates refunding within 5–10 years should think carefully about whether maximum premium today is the right choice.

Limit 4 — Political Optics (The Public Perception Ceiling)

Public perception matters in municipal finance — perhaps more than in corporate finance, because issuers are accountable to voters and elected officials. A deal with a $50 million premium on a $200 million issue ($250 million of total cash on a $200 million authorization) generates predictable headlines.

The 10–12% premium range is roughly where political optics start to push back. Above that, the issuer should expect questions in city council meetings, opinion pieces in local newspapers, and attention from watchdog groups.

Rule of thumb: premium above 10% of par requires explicit political planning — not just technical analysis.

Limit 5 — TIC vs All-In TIC Divergence (The Technical Ceiling)

True Interest Cost (TIC) is calculated based on the bond's stated yield to maturity. All-In TIC adds back issuance expenses and other costs. For most deals, TIC and All-In TIC are within 25–50 basis points of each other.

Very high premium structures can cause this gap to widen. When TIC and All-In TIC diverge by more than 75 basis points, it is usually a signal that the deal economics are being structurally distorted by premium engineering.

Rule of thumb: monitor the TIC vs All-In TIC gap. Above 75 bps divergence, reconsider the premium structure.

This deserves its own section because it is the most subtle and most often misunderstood aspect of premium structure decisions. Premium and refunding interact in three important ways.

1. Higher Coupons Increase Refunding Sensitivity

A bond with a 5% coupon is more refundable than a bond with a 3% coupon, because there is more interest cost to save in any rate environment. If rates fall to 3% from a 5% coupon, the issuer can refund and save 200 basis points. If rates fall to 3% from a 4% coupon, only 100 basis points of savings are available.

Mechanically, this means premium structures are "more callable" in an economic sense — they have more value to the issuer's right to call early.

2. The Premium Has Already "Paid" for Some Refunding Value

When an issuer captures $50 million of premium today, some of that premium represents the bondholder's compensation for accepting a callable bond at 5% coupon vs. a non-callable bond at the prevailing market yield. In other words: part of the premium is the call option premium that bondholders charge for bearing call risk.

If the issuer later refunds, they "use" the call option they paid for. They cannot also recover the call option premium.

3. The Net Refunding Math

In simplified form: if an issuer uses a premium structure today and then refunds in 10 years, the total economic outcome is the difference between:

• Today's premium captured + future refunding savings (if any)
• vs. what the issuer would have captured with a par-coupon structure today + future refunding savings (likely larger if rates fall).

Whether the premium structure or the par structure produces a better long-term outcome depends on the rate path. For rising-rate scenarios, premium structures tend to outperform. For falling-rate scenarios, par structures may outperform if the issuer fully exercises the refunding option.

The empirical evidence from the 2010–2020 falling-rate environment was mixed: most issuers who used premium structures and then refunded came out ahead, because the refunding savings exceeded the difference between the original premium structures and what par would have produced. But this was a function of the specific rate environment, not a universal rule.

To make all of the above concrete, consider the proposed the Issuer $1,000,000,000 Series 20XX general capital project financing. The deal as structured by the underwriter (scale dated April 23, 2026):

Goldilocks Assessment

The 6.65% premium ratio sits at the top of the standard zone, just below the aggressive-but-defensible threshold. This is appropriate for a deal of this size and complexity, given that:

• Cost of Issuance for a $1 billion deal will run approximately $20–35 million.
• Capitalized interest during a multi-year construction phase could absorb $200–400 million.
• Project fund supplement is a reasonable use given the scale and risk inherent in major capital construction.

In other words: there are clear, defensible structural uses for the entire $66,512,112 of premium. The deal is not over-premium-engineered.

What Could Push the Deal Above the Goldilocks Range?

If at pricing the underwriter and county finance team end up at, say, 9–11% premium ($90,000,000–$110,000,000), that would be cause for explicit board discussion. The political optics question "why are we delivering $5.5 billion when voters approved $1 billion?" would deserve a direct, documented answer in the bond documents.

What Could Push the Deal Below the Goldilocks Range?

A deal that priced at 1–2% premium ($10,000,000–$20,000,000) might leave the Issuer structurally short of funds for one of the legitimate uses (DSRF, cap-i, project fund). The County's representative should evaluate whether the lower premium reflects market conditions (rates rose between scale date and pricing day) or aggressive yield negotiation that may have undercompensated investors.

The following is a practical decision framework for treasurers and finance directors evaluating premium structure on an upcoming deal. The questions should be answered explicitly, in writing, before the pricing call.

Question 1 — What Will the Premium Fund?

Document, line by line, where premium dollars will be deployed:

• Cost of Issuance (typically 0.3–1.5% of par)
• Capitalized Interest (varies by construction timeline)
• Debt Service Reserve Fund (typically one year of debt service for revenue bonds)
• Project Fund Supplement (variable, tied to project scope)
• Other (e.g., cost overruns, contingency)

If the documented uses sum to less than the proposed premium, the premium is too high for this deal. Cut the coupon down or reduce the premium target.

Question 2 — What Is the Goldilocks Position?

Calculate premium as % of par. Compare against the standard zones:

• 0–3% — investigate whether the deal captured enough premium for COI
• 3–7% — standard zone; proceed with normal due diligence
• 7–12% — aggressive but defensible; document Sources & Uses explicitly
• 12–18% — high; require explicit board approval and rationale
• 18%+ — very high; consult bond counsel on arbitrage and authorization issues

Question 3 — What Is the Refunding Outlook?

If the issuer expects to refund in 5–10 years (because current rates feel high relative to historical norms), the optimal premium is lower than if rates feel low and refunding is unlikely. Make this judgment explicitly.

Question 4 — What Is the Political Risk?

If the political environment is sensitive to bond authorization issues — recent contested elections, watchdog group attention, hostile media coverage — premium above 10% creates additional risk. Make the political assessment explicit.

Question 5 — Is the Underwriter's Benchmark Defensible?

Ask the underwriter to show the spreads to MMD, BVAL, ICE, and Tradeweb. If they only show MMD, ask why. If the spreads to BVAL imply a meaningfully higher premium than the spreads to MMD, the underwriter should explain which benchmark they believe represents fair value and why.

This is one of the most important pieces of leverage the treasurer has on pricing day. Underwriters often default to MMD because it is the historical industry standard, but the largest financial advisor in the country (PFM) has switched to BVAL as primary benchmark, and three free alternatives (BVAL, ICE, Tradeweb) sit on the MSRB's EMMA website. The treasurer is entitled to push back.

Question 6 — Is There Adequate Time to Walk Away?

If the negotiation feels rushed or one-sided, the treasurer should be willing to delay pricing by 24–48 hours. Most underwriters will accommodate this if pushed. Pricing under time pressure favors the underwriter, not the issuer.

"A premium bond means the issuer pays back more than they borrowed."

False.

The issuer borrows the par amount and pays back the par amount at maturity. The premium represents the bondholder's pre-payment for the right to receive coupon income above the market rate — a transaction between buyer and seller at issuance. The issuer's obligation is the par amount plus the contractual coupon interest.

"Premium bonds lose money for investors when the bond matures."

False.

As discussed in Section V, the IRS requires investors to amortize bond premium over the life of the bond, reducing tax basis to par. The investor does not realize a capital loss at maturity because the basis has been adjusted. The premium is the cost of acquiring tax-exempt income, fully accounted for over the holding period.

"Premium structures hide the true cost of borrowing."

Partly true, but misleading.

True Interest Cost (TIC) and All-In True Interest Cost both account for premium amortization in their calculations. TIC is yield to maturity; All-In TIC adds COI and other expenses. Both are standard disclosures in bond documents. A treasurer who reads the official statement carefully sees the true cost. The misconception arises when public discussion focuses on coupon rate (which is high) rather than yield to maturity (which is the actual cost of borrowing).

"5% coupons are required by law."

False.

The 5% coupon convention is market practice, not regulation. An issuer can choose any coupon rate. The reasons for the 5% standard are entirely related to investor preferences (de minimis tax cushion) and market liquidity (5% bonds trade more easily). For specific transactions — bank-qualified placements, retail-targeted serials, certain refundings — different coupons are common.

"Premium issuance violates voter authorization."

Generally false in Texas.

The dominant view among Texas bond counsel is that premium proceeds are part of the consideration paid for the par bonds and do not constitute additional borrowing beyond the authorization. Voters authorize the issuer to issue par bonds; the price at which those bonds are sold (which determines premium) is a market-driven outcome, not a separate authorization question. However, this position is not unanimous, and some bond counsel will raise concerns when premium exceeds 10% of par.

"A higher premium today is always better for the issuer."

False, and dangerously so.

Higher premium captured today reduces refunding flexibility tomorrow, can run afoul of IRS arbitrage rules, creates political optics issues, and may produce a worse long-term economic outcome if rates fall. The right premium is the smallest premium that funds the legitimate structural uses identified in the Sources & Uses analysis. More is not better.

Industry Publications

• PIMCO. Valuing Callable Municipal Bonds. Educational paper on the 5% coupon convention and the relationship between callable structures and the MMD curve. (Updated 2024.)
• PIMCO. Understanding Premium Municipal Bonds. Investor-focused explainer on why premium bonds are common in the muni market.
• AllianceBernstein. Premium Municipal Bonds: Myth vs. Fact. Addresses common misconceptions about premium bond capital loss treatment.
• Thornburg Investment Management. The Municipal Market: High Coupons & High Premiums. Discussion of how the U.S. tax code structurally favors premium muni issuance.
• Breckinridge Capital Advisors. Premium Bonds 101. Explains de minimis rule mechanics and impact on premium bond demand.
• Fidelity Investments. Municipal Market Focus: New Issue Premium Coupon Bonds. Practitioner-oriented overview.

Regulatory and Tax Authority

• Internal Revenue Code §171 (premium amortization for tax-exempt bonds)
• Internal Revenue Code §1278 (de minimis rule for discount bonds)
• Treasury Regulations §1.148 (arbitrage rebate)
• MSRB Rule G-32 (disclosure of pricing information)

Industry Press

• The Bond Buyer — daily coverage of the U.S. municipal market, including coupon and pricing trends. Particularly: PFM transition to BVAL coverage (December 2023).
• MSRB Press Releases on EMMA enhancements (BVAL hourly updates, addition of ICE and Tradeweb curves).

Internal CityBase.Net References

• the Issuer $1,000,000,000 Series 20XX Bond Pricing Teaching Dashboard — this dashboard.
• McKinney 2025A/2025B/Refunding pricing analyses — detailed worked examples of premium calculations under different coupon structures.

— End of Note —
Prepared by CityBase.Net • Lewis F. McLain Jr. • April 2026