Fixed versus Floating Rate Borrowing Decisions

Why This Topic Matters
Every treasury professional who raises debt must answer one question before anything else: should the interest cost be locked in or allowed to move with the market? The fixed-versus-floating decision sits at the intersection of capital structure, interest rate risk management, and liquidity planning, which is why the AFP CTP exam tests it in the Capital Structure and Long-Term Capital domain. Getting it wrong can mean paying far more than necessary for financing, exposing earnings to volatility that erodes credit metrics, or breaching covenants when rates move unexpectedly. The exam expects you to understand not only the mechanics of each borrowing type but the reasoning a treasurer uses to choose between them and the tools (especially interest rate swaps) used to convert one into the other.

What It Is
Fixed rate borrowing is debt on which the coupon or interest rate is set at issuance and does not change for the life of the instrument. Examples include most corporate bonds, many term loans, and fixed-rate mortgages. The borrower knows the exact cash interest cost in advance.

Floating (variable) rate borrowing is debt on which the interest rate resets periodically (daily, monthly, quarterly) based on a reference rate plus a credit spread. Common reference rates include SOFR (Secured Overnight Financing Rate), the prime rate, EURIBOR, SONIA, and historically LIBOR. Examples include bank revolving credit facilities, commercial paper programs (functionally floating because each issuance reprices), floating rate notes (FRNs), and syndicated term loans. The spread reflects the borrower's credit quality and generally stays constant, while the reference rate moves with the market.

How It Works: The Core Trade-Offs

1. Cost expectations and the yield curve. In a normal (upward-sloping) yield curve, short-term rates are lower than long-term rates, so floating rate debt usually starts out cheaper than fixed rate debt of the same maturity. The borrower is essentially betting that rates will not rise enough to eliminate that initial advantage. Fixed rate borrowing locks in a higher starting cost in exchange for certainty. If the curve is inverted, floating may initially cost more than fixed. Exam questions frequently describe the shape of the yield curve or the rate outlook and ask which structure is appropriate.

2. Cash flow certainty versus flexibility. Fixed rate debt produces predictable interest expense, which simplifies budgeting, protects interest coverage ratios, and supports stable dividends. Floating rate debt introduces variability but usually offers easier and cheaper prepayment, which matters if the company expects to retire debt early or refinance.

3. Asset-liability matching. A fundamental treasury principle is to match the interest rate characteristics of liabilities to the assets or revenues they finance. If a firm's revenues or asset returns rise and fall with short-term interest rates (for example, a financial institution holding floating rate loans, or a company whose pricing is linked to inflation and rates), floating rate debt creates a natural hedge. If revenues are fixed or contractual (a long-term lease stream, a regulated utility tariff), fixed rate debt is the natural match. Mismatches expose the firm to margin compression when rates move.

4. Interest rate risk exposure. Floating rate borrowers carry cash flow risk: rising rates increase interest payments. Fixed rate borrowers carry opportunity cost or fair value risk: if rates fall, they are stuck paying above-market rates, and the market value of their debt rises (which matters for mark-to-market reporting and for any early redemption). Neither choice eliminates risk; each simply changes its form.

5. Prepayment and call features. Floating rate bank debt is typically prepayable at par with little or no penalty. Fixed rate bonds often carry make-whole provisions or call premiums, making early retirement expensive. A company anticipating a sale of assets, an IPO, or strong cash generation may favor floating for flexibility.

6. Market access and credit quality. Investment-grade issuers can access long-dated fixed rate bond markets at attractive spreads. Smaller or lower-rated borrowers often depend on bank financing, which is predominantly floating. In practice, the decision is sometimes constrained by what the market will offer.

7. Covenants and credit metrics. Rising floating rates reduce interest coverage (EBIT divided by interest expense) and fixed charge coverage. Treasurers model stress scenarios (for example, a 200 basis point rate shock) to confirm covenant headroom under floating structures.

Converting Between Fixed and Floating: Interest Rate Swaps
The decision is not permanent. An interest rate swap allows a borrower to change the effective nature of its debt without refinancing. In a plain vanilla swap, two parties exchange interest payments on a notional principal: one pays fixed and receives floating; the other pays floating and receives fixed. No principal changes hands.

Pay-fixed / receive-floating swap: A company with floating rate debt enters a swap in which it pays a fixed swap rate and receives the floating reference rate. The floating receipt offsets the floating interest on the loan, leaving a net fixed cost (fixed swap rate plus the loan's credit spread). This synthetically converts floating debt to fixed. Use this when you expect rates to rise or want certainty.

Receive-fixed / pay-floating swap: A company with fixed rate bonds swaps to receive fixed and pay floating, converting its effective cost to floating. Use this when you expect rates to fall or want to match floating rate assets.

Worked example: A company borrows $50 million at SOFR + 150 basis points. It enters a 5-year pay-fixed swap at 3.50%, receiving SOFR. Net cost = pay (SOFR + 1.50%) on the loan, receive SOFR on the swap, pay 3.50% on the swap = 3.50% + 1.50% = 5.00% fixed. If SOFR later rises to 5%, the loan costs 6.50%, but the swap pays the company 5% while it pays 3.50%, netting a 1.50% gain and restoring the 5.00% all-in cost.

Other hedging tools tested on the CTP include interest rate caps (the borrower pays a premium for protection if the floating rate exceeds a strike, while keeping the benefit if rates fall), floors (used by lenders or sold by borrowers), collars (buying a cap and selling a floor to reduce or eliminate premium cost, locking the rate within a band), and forward rate agreements (locking a rate for a single future period). Swaptions give the right to enter a swap in the future.

Comparative Advantage and Swap Rationale
Exam questions sometimes present two companies with different borrowing costs in fixed and floating markets. The classic example: Company A (strong credit) borrows at 5% fixed or SOFR + 0.25%; Company B (weaker credit) borrows at 6.50% fixed or SOFR + 1.00%. A has an absolute advantage in both, but a larger relative advantage in fixed (150 bp versus 75 bp). If A borrows fixed and B borrows floating and they swap, total borrowing cost falls by the difference in spreads (150 minus 75 = 75 bp), which the parties share. The exam may ask you to identify which company should borrow in which market or to compute the total gain.

Decision Framework a Treasurer Applies
1. What is the interest rate sensitivity of the assets or cash flows being financed?
2. What is the current shape of the yield curve and the company's view on rate direction?
3. How much interest expense volatility can earnings, covenants, and credit ratings absorb?
4. Is early repayment or refinancing likely?
5. What does the company's interest rate risk policy specify as the target fixed/floating mix (many policies target, for example, 50 to 75 percent fixed)?
6. Can derivatives achieve the desired profile more cheaply than issuing directly?

Most companies do not choose all fixed or all floating. They manage a portfolio mix and adjust it over time using swaps, guided by board-approved policy.

Accounting and Reporting Considerations
Under US GAAP (ASC 815) and IFRS 9, swaps used to convert floating to fixed are typically designated as cash flow hedges, with effective changes in fair value recorded in other comprehensive income. Swaps converting fixed to floating are fair value hedges, with gains and losses on the swap offset by changes in the hedged debt's fair value in earnings. Hedge accounting requires documentation at inception and effectiveness assessment. The CTP exam tests the ability to identify which hedge type applies to which swap direction.

Exam Tips: Answering Questions on Fixed versus Floating Rate Borrowing Decisions

Tip 1: Translate the rate outlook into a recommendation immediately. If the question says rates are expected to rise, the answer favors fixed rate debt or a pay-fixed swap, or buying a cap. If rates are expected to fall, favor floating or a receive-fixed swap. This single mapping resolves a large share of questions.

Tip 2: Memorize the swap direction logic. Floating debt + pay-fixed/receive-floating swap = synthetic fixed. Fixed debt + receive-fixed/pay-floating swap = synthetic floating. Write this down on your scratch material at the start of the exam if the topic appears. Questions often try to confuse you by describing the counterparty's side; always answer from the perspective of the company named in the question.

Tip 3: Compute net cost step by step. For synthetic fixed: all-in rate = swap fixed rate + credit spread on the loan. The floating legs cancel. Do not forget the spread; a common wrong answer is the bare swap rate.

Tip 4: Apply the matching principle. When the question describes the nature of the company's assets or revenues, choose the debt type that matches. Floating rate assets or rate-sensitive revenues call for floating debt; fixed, long-term, contractual cash flows call for fixed debt. Banks and finance companies are classic floating-rate borrowers for this reason.

Tip 5: Distinguish certainty from cheapness. The exam often contrasts the lowest expected cost (usually floating on a normal yield curve) with the greatest predictability (fixed). Read the question stem for words like budget certainty, covenant protection, minimize volatility (answer: fixed) versus minimize expected cost, flexibility to prepay, short holding period (answer: floating).

Tip 6: Know the yield curve implications. Normal (upward-sloping) curve means floating is cheaper today. Inverted curve means fixed may be cheaper today. Flat curve means the choice rests on risk preference rather than cost.

Tip 7: Caps, floors, collars. A borrower wanting protection against rising rates but wanting to keep the benefit of falling rates buys a cap. A borrower who also sells a floor to offset the cap premium has a collar and gives up some downside benefit. A floating rate lender buys a floor. Match the instrument to who is protected against which direction.

Tip 8: Hedge accounting pairings. Converting floating to fixed = cash flow hedge. Converting fixed to floating = fair value hedge. Expect at least one question that tests this.

Tip 9: Comparative advantage problems. Each party borrows where its relative advantage is greatest, then swaps. Total gain = difference between the fixed rate differential and the floating spread differential. Compare differences, not absolute levels.

Tip 10: Watch for prepayment and refinancing clues. Expected early repayment, pending asset sale, or anticipated refinancing points toward floating rate bank debt because of easy prepayment. Long-lived assets with stable financing needs point toward long-term fixed rate bonds.

Tip 11: Remember policy and mix. If a question references treasury policy or risk tolerance, the best answer usually describes maintaining a target fixed/floating mix and using swaps to adjust it, rather than an all-or-nothing choice.

Tip 12: Eliminate answers that confuse the forms of risk. Floating rate borrowers face cash flow risk; fixed rate borrowers face fair value and opportunity cost risk. An answer stating that fixed rate debt has no interest rate risk is wrong.

Quick Review Summary
Fixed rate debt: certain cost, higher initial rate on a normal curve, costly to prepay, best when rates are expected to rise or when cash flows being financed are fixed. Floating rate debt: variable cost tied to a reference rate plus spread, cheaper initially on a normal curve, easy to prepay, best when rates are expected to fall or when assets are rate-sensitive. Swaps convert one to the other: pay-fixed creates synthetic fixed (cash flow hedge), receive-fixed creates synthetic floating (fair value hedge). Caps protect borrowers against rising rates; collars reduce premium cost by capping the benefit of falling rates. Most treasuries manage a target mix guided by policy, asset-liability matching, covenant headroom, and the rate outlook. Master these linkages and the exam questions on this topic become a matter of careful reading and direct application.