Growth debt interest rates and costs

The interest rate is only one part of the cost of growth debt. A borrower may also pay arrangement fees, charges on undrawn commitments, end-of-term payments, legal expenses, prepayment costs and equity participation.

The right comparison is the complete cash and equity cost under the company’s expected use of the facility and realistic downside scenarios. A low headline margin can be expensive if little of the commitment is usable or the company exits early.

How the interest rate is built

A floating rate commonly combines a reference rate and a margin. The reference rate moves with the market; the margin is the lender’s additional percentage for the credit risk and required return.

For sterling loans the reference may be linked to SONIA, the Sterling Overnight Index Average administered by the Bank of England. US dollar loans may reference SOFR, the Secured Overnight Financing Rate published by the Federal Reserve Bank of New York. The agreement determines the precise benchmark, calculation method and observation period.

A fixed rate stays at an agreed percentage for the relevant period. It provides payment certainty but may not become cheaper if market rates fall. A borrower should compare the rate and any break or prepayment cost rather than assuming fixed or floating is inherently better.

Reference rate, margin and floor

A floor matters when the benchmark falls below the stated minimum. If a loan is benchmark plus margin with a benchmark floor, the margin is added to the higher of the actual benchmark and that floor.

Check whether the margin steps up or down with leverage, performance, time or an event. Model the exact dates and conditions rather than using one rate for the entire term.

Cash interest and PIK interest

Cash-pay interest is paid in cash on scheduled dates. Payment-in-kind interest, commonly called PIK, is added to the loan balance instead of being paid immediately.

PIK preserves near-term liquidity but increases the amount on which later interest may be calculated. If it compounds, the borrower can pay interest on earlier interest. The maturity payment therefore grows.

Some facilities allow or require a mixture. Check whether the split is fixed, selected by the borrower or controlled by the lender, and whether choosing PIK changes the rate.

Arrangement, commitment and unused fees

An arrangement or upfront fee is usually charged for putting the facility in place. It may be calculated on the total commitment even if the company initially draws less.

A commitment or unused fee is charged on capital that the lender has committed but the borrower has not drawn. It compensates the lender for reserving capital. Confirm which undrawn amounts count, when the fee starts and whether conditional tranches are included.

Other process costs can include lender legal fees, due diligence, valuation, monitoring, account-control and security-registration expenses. Some are capped or require consent; others pass through at cost.

End fees and final payments

An end-of-term fee, final payment or back-end fee is an amount due at maturity, repayment or another specified event. The calculation may use the original commitment, amount drawn, peak balance or amount repaid.

The name does not determine the mechanics. Ask whether the payment accrues from signing, survives early repayment and becomes due on refinancing, an exit or acceleration after default.

A fee paid later still has economic value today and can materially increase the annualised cost of a short loan.

Prepayment costs

Prepayment means repaying before the scheduled date. The agreement may require a percentage premium, a minimum amount of interest, a make-whole calculation or payment of the end fee.

These terms protect the lender’s expected return but can reduce flexibility. Model a sale, refinancing and early equity-funded repayment at several dates.

A loan that appears cheap to maturity can be costly if the company expects to refinance within a year.

Warrants and equity participation

A warrant is a right to buy shares under stated terms. It can give the lender an equity return in addition to cash interest and fees.

Value depends on coverage, exercise price, share class, expiry, dilution protection and what happens on a financing, sale or listing. The cash cost may be zero today while the eventual equity cost is substantial if the company succeeds.

Do not add an arbitrary percentage to the cash rate and call that the warrant cost. Model ownership outcomes under plausible valuations and dilution scenarios, and separate them from contractual cash payments.

Commitment is not the same as usable capital

Interest normally applies to drawn principal, while fees may apply to the full commitment or undrawn amount. A facility split into tranches may carry costs before every tranche is available.

Compare net usable cash: amounts the company can actually draw, less upfront fees and required cash balances. Then compare payments and restrictions against that net amount.

Conditions based on revenue, an equity round or lender discretion make a later tranche less certain. A larger conditional commitment should not be valued like cash available at closing.

A simple illustrative example

Assume a fictional company draws £3 million for one year. The floating rate is an illustrative 4% benchmark plus a 7% margin, with no change during the year. The arrangement fee is 2% of the amount drawn and the final payment is 4% of that amount. These are arithmetic examples, not market terms.

The simple £510,000 total equals 17% of the £3 million draw, but it is not a complete annual percentage rate calculation. Payment dates, principal amortisation and whether fees are paid upfront change the effective cost. Any warrant also needs a separate scenario value.

If the company receives only £2.94 million after the upfront fee but pays charges based on £3 million, cost relative to net proceeds is higher. If principal amortises during the year, interest falls but the company gives up cash earlier.

How to compare two offers

Build a monthly model for each facility using the same operating case. Include:

• cash received at each draw, net of fees;
• reference-rate assumptions and any floor;
• cash and PIK interest on the correct balance;
• arrangement, unused, monitoring and final fees;
• principal repayments and required minimum cash;
• prepayment charges at likely exit or refinancing dates; and
• warrant ownership under several company valuations.

Run at least the expected case, delayed growth, a missed tranche and early repayment. Compare lowest cash, total cash paid, debt outstanding and equity transferred.

An internal rate of return calculation can help finance teams compare timed cash flows, but it should not replace operational judgement. Covenants, consent rights and lender behaviour are not captured by one percentage.

What determines the price

Pricing can reflect company stage, cash burn, recurring revenue, profitability, investor support, sector, security, facility size, lender mandate, competition and wider interest-rate markets.

These factors do not produce a universal venture debt or growth credit rate. Market quotes move, definitions differ and a stronger structure may trade a lower cash price for tighter control or equity upside.

Ask when an indicative price can change and what remains subject to credit approval, diligence or documentation.

Questions to ask before signing

1. 1What balance attracts interest, and from which date?
2. 2How are the benchmark, floor and margin calculated?
3. 3Which fees apply to the commitment, drawn amount or undrawn amount?
4. 4What is payable on maturity, refinancing, sale or default?
5. 5Can interest be added to principal, and does it compound?
6. 6What does early repayment cost at each likely date?
7. 7How is any warrant or equity participation calculated?
8. 8How much cash is definitely usable after conditions and fees?

The bottom line

Growth debt cost is the combined effect of interest, fees, repayment timing, conditional availability, prepayment terms and any equity participation.

Compare offers using actual monthly cash flows and equity scenarios. The cheapest margin is not necessarily the cheapest facility, and the largest commitment is not necessarily the most useful one.

Where to go next

• Growth debt term sheets explained shows how to read the whole offer before long-form documents.
• PIK and cash-pay interest compares cash-pay and capitalised interest.
• Warrants and equity kickers in growth lending explains lender equity rights and potential dilution.
• Growth debt repayment structures compares interest-only periods, amortisation and maturity structures.