Raising a Series A almost always means selling 12% to 18% of your company. For founders with strong, predictable customer acquisition, there is another route: finance the growth spend itself with a structured CAC loan and keep the equity. This guide explains how those loans work, what they cost against an equity round, how repayment and covenants are structured, and when the trade is worth making.
Structured CAC loan versus a Series A equity round
The two ways to fund the same growth look very different once you price them out.
| Feature | Structured CAC loan | Typical Series A equity |
|---|---|---|
| Dilution | 0% — ownership unchanged | 12% to 18% given up |
| Cost | Low single-digit interest plus a small fee | Implied cost ~30% to 45% via valuation uplift |
| Control | No board seats | Often 1 to 2 board seats |
| Flexibility | Repay early without penalty when coverage is healthy | Cannot unwind without a secondary sale |
| Exit impact | Debt clears on repayment and leaves the cap table | Equity stays, affecting every future round |
Put numbers on it. Fund $250,000 of growth as a CAC loan at roughly 4% all-in, and the financing costs about $10,000. Raise the same $250,000 as equity at an implied 30% cost of capital, and you effectively pay around $75,000 in surrendered value, plus a permanent slice of every future dollar. For a company that can service the debt, the gap is large and entirely in the founder's favour.
How a structured CAC loan works
The mechanics are built around your unit economics, not your valuation. A lender advances capital sized to your acquisition spend, then takes repayment as a fixed share of the revenue those new customers generate, commonly 5% to 7% of CAC-derived revenue a month, until the principal and a modest fee are repaid. Because the loan is underwritten on the predictability of your cohorts, the stronger your unit economics, the better the terms. It is the same logic that underpins a customer value fund: acquisition treated as a financeable asset rather than an expense.
Covenants and the coverage ratio
The key control is a cash-flow coverage ratio (CCR), the ratio of CAC-derived cash to the scheduled repayment. Lenders typically set a floor around 1.5; stay above it and you keep full flexibility, including early repayment. Fall below, usually when CAC spikes or revenue dips seasonally, and the agreement may accelerate repayment or add a small supplemental fee. The practical lesson is to model a worst-case CAC increase before signing, so a seasonal dip does not trip a covenant you assumed was safe.
Who qualifies
A CAC loan fits a company past early traction with clean, measurable acquisition. Lenders look for predictable monthly recurring revenue, a healthy CAC payback period inside twelve to eighteen months, and an LTV:CAC ratio around 3:1 or better. If your cohorts are noisy or your payback is long, the terms get expensive fast, and equity may genuinely be the cheaper option for that stage.
How to present it to lenders
- Lead with a CAC dashboard. Show month-over-month CAC, churn, and LTV, with the LTV:CAC ratio front and centre.
- Bring a sensitivity table. Model best, base, and worst cases, for example CAC rising 12% versus falling 8%, and show the coverage ratio holding above the floor in the worst case.
- Emphasise what stays clean. Retained equity, no board seats, and a cap table that keeps future rounds simple.
- Explain the risk controls. Walk through the covenant triggers, reporting cadence, and any reset clause that lets you refinance lower if metrics improve.
Where it fits in the capital stack
A CAC loan is rarely the whole answer. Many founders use it to bridge between seed and a later, smaller equity round, funding proven growth without dilution in the meantime. It sits alongside the wider menu of non-dilutive financing, including revenue-based financing and venture debt, each suited to a different stage and risk profile. The art is using debt for the predictable spend and saving equity for the genuinely unprovable risk.
Frequently asked questions
What is the typical cost of a CAC loan? All-in costs usually land in the low single digits annualised plus a small upfront fee, far below the implied 30% or more cost of an equity round, provided the business can service the repayment.
Can a CAC loan be combined with an equity round? Yes. A common pattern is to use the loan to bridge between seed and Series A, then raise a smaller equity round later, with the loan repaid before it dilutes ownership.
How is repayment calculated? Repayment is a fixed share of the cash flow from newly acquired customers, commonly 5% to 7% of CAC-derived revenue a month, until the principal plus fee is satisfied.
What happens if my CAC spikes? If the coverage ratio falls below the agreed floor, usually around 1.5, the lender may accelerate repayment or add a small supplemental fee. Modelling a worst-case CAC rise before signing avoids the surprise.
This article is for educational purposes and is not financial advice. Consult a licensed advisor before making funding decisions.
