How do I know if a loan will pay for itself?

2 min read

Return > total costThe core test

Quantify bothBenefit and cost

Discount for riskBe conservative

Clear marginNot a close call

The framework

Every borrowing decision reduces to one comparison: the value of what the loan funds — extra revenue, cost savings, a captured discount — against the total cost of borrowing over the term. If the return clearly exceeds the cost, the loan pays for itself and is worth taking. If it does not, or the two are close, the loan is a cost the business carries rather than an investment that funds itself.

Quantifying both sides honestly

Put real numbers on both. The cost side is straightforward — the total repayable from a true cost calculation. The return side needs discipline: estimate the extra revenue or saving conservatively, and discount it for the risk it does not materialise as hoped. Optimistic return estimates are how good-looking loans turn bad. If the case only works on best-case assumptions, treat it as a fail.

Requiring a clear margin

Do not borrow on a knife-edge. Because the cost is certain and the return is not, you want the expected return to beat the cost by a clear margin, not to scrape past it. That margin is your buffer against a return that disappoints. When the return comfortably exceeds the cost even on cautious assumptions, borrow with confidence; when it is marginal, keep the cash or find a cheaper way. See borrowing to grow.

Run the cost on the true cost calculator, test the affordability on the affordability calculator, and when the case is clear, apply.

Frequently asked questions

What return should a business loan generate to be worth it?

Enough to clearly exceed the total cost of borrowing over the term, with a margin to spare — not just scrape past it. Because the cost is certain and the return is not, you want the expected benefit to beat the cost comfortably even on conservative assumptions. A loan whose case only works on optimistic figures is too risky; require a clear margin before committing.

How do I estimate the return conservatively?

Base it on evidence rather than hope: proven demand, signed contracts, documented savings, realistic ramp times. Then discount it — assume revenue arrives later and smaller than you expect, and that some of the benefit does not materialise. If the loan still pays for itself under those cautious assumptions, the case is genuinely strong. If it only works on best-case numbers, it is not.