Interest Rate Cap and Floor: Collars, Pricing, and ASC 815

An interest rate cap and an interest rate floor are mirror-image hedging contracts tied to a floating benchmark rate. A cap pays the buyer whenever the benchmark rises above an agreed strike rate, protecting a floating-rate borrower from rising rates. A floor pays the buyer whenever the benchmark falls below an agreed strike rate, protecting the holder of a floating-rate asset from falling rates. Both are over-the-counter derivatives, both require an upfront premium from the buyer, and both reference a floating index — most commonly the Secured Overnight Financing Rate (SOFR), which currently sits near 3.66% on a 30-day average basis.¹ No principal ever changes hands between the parties; only the rate differential, applied to a notional amount, moves.

How an Interest Rate Cap Works

A cap is a one-way bet the buyer makes against rising rates. The seller agrees to pay the buyer whenever the reference rate exceeds the strike rate, and the payout equals the difference between the two rates, applied to a notional principal that typically mirrors the outstanding loan balance.² The buyer pays a single upfront premium. After that, the cap either pays out or it sits dormant, and there is no ongoing fee either way.

Take a borrower who buys a cap with a 6% strike on a $10 million floating-rate loan. If 30-day average SOFR climbs to 7%, the cap provider pays the borrower 1% on the notional, which effectively caps the borrower’s index rate at 6%.² If SOFR stays at 6% or below, nothing happens and the borrower pays market rates. That is the cap’s central advantage over fixing the rate outright: the borrower keeps the full benefit of lower rates while shedding the exposure to higher ones.

A cap is not a single option. It is a series of smaller options called caplets, each covering one reset period of the underlying loan. A five-year cap with quarterly resets contains twenty caplets, and each one is independently priced against the forward rate for its specific period. The settlement dates are synchronized with the loan’s reset dates, so when SOFR exceeds the strike on a reset date, the cap payment arrives at the same time the borrower owes higher interest. Mismatched timing would make the protection almost useless.

Why Lenders Require Them

On commercial floating-rate loans, buying a cap is rarely optional. Lenders routinely require the borrower to purchase one as a condition of the loan, because the lender needs assurance the borrower can service the debt if rates spike. The cap is then collaterally assigned to the lender, meaning the lender controls it and receives any payments directly into the loan’s cash management account. Lenders also police the cap provider’s credit quality. Fannie Mae, for example, requires cap providers to hold minimum ratings of A from S&P and A2 from Moody’s on issuer or senior debt.² A cap from an under-capitalized provider is cheap for a reason: counterparty credit risk is the main vulnerability in any cap arrangement, because the cap is only as good as the seller’s ability to pay when the time comes.

If the cap expires before the loan matures, the borrower has to buy a replacement, and lenders typically require a replacement cap escrow funded at closing to make sure the money is there. Freddie Mac sizes this escrow at 100% to 125% of the estimated cost of a replacement cap, with semi-annual reviews.³

How an Interest Rate Floor Works

A floor is the inverse product. It protects the holder of a floating-rate asset — a lender, bond investor, or fund manager — against falling rates. The seller pays the buyer whenever the reference rate drops below the floor strike, and the payout equals the shortfall applied to the notional. The buyer pays an upfront premium for this minimum-income guarantee.

If an investor buys a floor with a 3% strike and SOFR falls to 2%, the floor pays out 1% on the notional, replacing the lost interest income. As long as SOFR stays above 3%, the floor sits dormant and the investor collects market rates. Like a cap, a floor is structured as a series of individual options, called floorlets, each covering one reset period.

Floors are most valuable when central banks are cutting benchmark rates. The periodic payments stabilize the holder’s revenue stream without forcing a conversion of the floating-rate asset into a fixed-rate instrument, which would mean giving up the benefit if rates later rebound.

Combining Them: The Interest Rate Collar

A collar combines both instruments into one strategy. The borrower buys a cap for upside protection and simultaneously sells a floor for income, using the premium received from the floor to offset the premium paid for the cap. The result is a defined band inside which the borrower’s effective rate floats freely.

A borrower with a $100 million floating-rate loan might buy a 6% cap and sell a 3% floor. Rates above 6% become the cap seller’s problem. Rates below 3% become the borrower’s loss, because selling the floor means paying out when the market drops that low. Between 3% and 6%, the borrower simply pays the market rate.

When the premium received from selling the floor exactly equals the premium paid for the cap, the result is a zero-cost collar. The borrower gets rate protection with no net cash outlay, which is why collars appeal to companies that want hedging without a large derivative premium on the books. The real trade is that you give up the benefit of favorable rate moves to pay for protection against unfavorable ones.

Cap or Swap?

The most common alternative to a cap is an interest rate swap, in which the borrower exchanges floating-rate payments for a fixed rate. Both hedge against rising rates, but they behave very differently.

A swap typically requires no upfront premium, because the fixed rate is set so the swap’s initial value is zero. A cap requires an upfront payment that can be substantial for longer terms or lower strikes.
A cap preserves the benefit of falling rates. A swap locks in the fixed rate regardless of where the market goes, so the borrower gets no help if rates fall after execution.
A swap gives certainty: the effective rate is fixed. A cap gives catastrophe insurance: it only helps when rates exceed the strike, so the borrower still faces rate variability below that strike.
A swap can become a sizable liability if rates move against the borrower, creating ongoing credit exposure for the counterparty. A cap buyer’s maximum loss is the premium already paid, which makes caps available to borrowers with weaker credit or thinner banking relationships.
A cap can generally be terminated at no penalty, because it has a residual market value the buyer can recover. A swap can carry a significant breakage cost if terminated early when it is out of the money.

For a short-term transitional loan where the borrower expects to refinance or sell, a cap is almost always the better fit. For a long-term loan where budget certainty matters more than keeping the upside, a swap often makes more sense.

What Caps and Floors Cost

Because each caplet or floorlet is a separate option on a future interest rate, pricing relies on option pricing models — the Black-76 model is the standard. The seller prices each individual option and adds them up. Four variables drive the total premium.

The strike rate relative to the forward rate curve is the single biggest factor. The forward curve is the market’s expectation of where SOFR will sit at each future reset date. A cap struck well above the forward curve is out-of-the-money and cheap. A cap struck at or below the forward curve is at- or in-the-money and expensive. The same logic runs in reverse for floors.

Implied volatility is next. Higher volatility means a greater probability that rates will breach the strike at some point, so each option is worth more. Premiums compress in calm rate environments and expand when the market is uncertain about the path of rates.

Term adds up quickly. Longer caps cost more because they contain more caplets and each later caplet covers a period with greater uncertainty. A five-year cap costs far more than a one-year cap at the same strike. Notional scales linearly: a $50 million cap costs twice as much as a $25 million cap on otherwise identical terms.

Pricing moves constantly. As of late March 2026, with 30-day average SOFR near 3.66%, a two-year cap on a $25 million notional at a 4% strike runs roughly $161,000, while the same cap at a 3% strike costs about $476,000.¹ Push that 3% strike out to five years and the premium jumps to around $1.27 million. Those numbers change daily, but the trade-off they illustrate is permanent: lower strikes and longer terms cost dramatically more.

Cap costs surged in 2022 and 2023 when the Federal Reserve raised rates aggressively, catching many commercial real estate borrowers off guard at renewal. A cap that cost $50,000 in early 2022 might have cost $500,000 a year later for similar terms. That is why lender-required replacement cap escrows exist, and why borrowers who underfund them can find themselves scrambling.

Documentation and Regulation

Caps and floors are documented using standardized forms published by the International Swaps and Derivatives Association (ISDA). A typical transaction involves an ISDA Master Agreement between the parties, a schedule customizing its terms, a confirmation setting out the economic details of the particular cap or floor, and often a Credit Support Annex governing collateral. The confirmation references the 2006 ISDA Definitions, which standardize rate calculations, business day conventions, and payment mechanics. The Master Agreement’s closeout netting provisions let the solvent party terminate all transactions and net gains against losses if the other side defaults, instead of fighting over each trade separately.

Under the Dodd-Frank Act, most standardized swaps must be centrally cleared. A non-financial company hedging commercial risk can qualify for the end-user exception, which keeps the transaction bilateral rather than running it through a clearinghouse. To qualify, the company must not be a financial entity, must be using the swap to hedge or mitigate commercial risk, and must notify the CFTC of how it meets its financial obligations on non-cleared swaps.⁴ Even when the exception applies, the bank selling the cap, as a registered swap dealer, still carries its own compliance obligations.⁵

Early Termination and Transfer

A cap buyer can generally terminate the cap early and recover whatever market value remains. Unlike a swap, which can carry negative value the borrower would have to pay to exit, a purchased cap’s value cannot drop below zero. The worst case is that it is worthless because rates sit far below the strike. If rates have risen since purchase, the cap may actually be worth more than the original premium.

Transfer is more complicated when the cap secures a loan. Once the cap is collaterally assigned to a lender, the borrower cannot sell, transfer, modify, or terminate it without the lender’s written consent. The lender controls the cap until the loan is repaid. If the property or loan is transferred through an assumption, the cap assignment typically travels with it, and the new borrower steps into the existing cap arrangement. The cap provider acknowledges the assignment and continues making payments into the original cash management account until instructed otherwise. The collateral assignment ends when the cap expires or the loan is paid in full, whichever comes first.⁶

Accounting Under ASC 815

Under U.S. GAAP, ASC Topic 815 governs how derivatives appear on financial statements.⁷ The practical question is whether the cap or floor qualifies for hedge accounting, because the answer decides whether fair value swings hit the income statement each quarter or sit in equity until they are needed.

To qualify, the company must formally document the hedging relationship at inception, identifying the hedging instrument, the hedged item (such as a specific loan’s variable interest payments), the nature of the risk being hedged, and how the company will assess whether the hedge is working. Retroactive designation is not allowed; you cannot buy a cap, wait to see how it performs, and then claim it was a hedge all along.

When a cap or floor qualifies as an effective cash flow hedge, changes in its fair value go to Other Comprehensive Income rather than through the income statement. The gains or losses stay there until the hedged interest payments actually affect earnings, at which point they are reclassified to match. If the instrument does not qualify — either because the documentation is defective or because it is being held speculatively — every change in fair value hits earnings immediately.⁷ For a public company, that can introduce quarterly earnings swings that have nothing to do with the underlying business.

Federal Tax Treatment

For federal tax purposes, caps and floors are classified as notional principal contracts, and Treasury Regulation Section 1.446-3T governs how their payments are reported.⁸

The upfront premium is a nonperiodic payment, and the IRS generally splits it into two components for tax purposes: an on-market swap with level payments spread over the contract’s life, and a financing element that generates imputed interest. The practical result is that the premium is spread over the contract’s life rather than deducted all at once. Exceptions apply for contracts with a term of one year or less and for contracts subject to daily margin or collateral requirements that fully collateralize the mark-to-market exposure; in those cases, the bifurcation does not apply.⁸

Periodic cap or floor payments received during the contract’s life are reported as ordinary income, and payments made are ordinary deductions, recognized when they accrue to match the timing of the underlying interest income or expense. Cap providers receiving payments of $600 or more attributable to notional principal contracts report them on Form 1099-INT.⁹

1
Federal Reserve Bank of St. Louis. SOFR Averages and Index
2
Fannie Mae. Multifamily Interest Rate Cap FAQs
3
Freddie Mac. Interest Rate Cap Options for Floating Rate Cash Loans
4
CFTC. Final Rule on End-User Exception to the Clearing Requirement
5
Federal Register. Revisions to Business Conduct and Swap Documentation Requirements for Swap Dealers and Major Swap Participants
6
SEC. Collateral Assignment of Interest Rate Cap Agreement
7
Financial Accounting Standards Board (FASB). Topic 815 – Hedge Accounting Improvements
8
GovInfo. 26 CFR 1.446-3T – Notional Principal Contracts
9
Internal Revenue Service. Instructions for Forms 1099-INT and 1099-OID