2 min read
Two uses for the same surplus
Surplus cash can go two ways: overpay the loan, or invest in the business. Overpaying a reducing-balance loan saves a guaranteed amount of interest — a certain, risk-free return equal to your borrowing rate. Investing in the business might earn more, but the return is uncertain and could disappoint. The choice is between a sure thing and a gamble with a potentially higher payoff.
Comparing them properly
The honest comparison is the guaranteed interest saving against the risk-adjusted expected return of the investment — not its best case. An investment that might return well above your loan rate can still be the wrong call if the risk of it failing is high. Overpaying wins when the guaranteed saving beats a realistic, discounted view of the alternative. Investing wins when a genuine, evidenced opportunity clearly exceeds the borrowing rate even after allowing for risk.
The buffer comes first
Before either, keep a healthy cash buffer — neither overpaying nor investing should leave you exposed. With the buffer secure, if the loan rate is high and no strong opportunity exists, overpay. If a compelling, well-evidenced investment offers a clearly better risk-adjusted return, deploy the cash there and keep the loan running. Many businesses do a mix. See borrow or use cash.
Check for any early repayment charge before overpaying, model the saving on the repayment calculator, and if you'd rather invest and borrow for it, apply.
Frequently asked questions
Is overpaying my loan a guaranteed return?
Effectively yes, on a reducing-balance loan — every pound of overpayment saves the interest that pound would otherwise have accrued, at your borrowing rate, risk-free. That makes overpaying a certain return equal to your loan rate. An investment has to beat that rate on a risk-adjusted basis to be the better use of the cash. Check for any early-repayment charge, which can reduce the saving.
When should I invest rather than overpay?
When you have a genuine, evidenced opportunity whose expected return clearly beats your borrowing rate even after discounting for risk — and you have kept a healthy buffer. If the investment case rests on optimistic assumptions or the opportunity is speculative, the guaranteed saving from overpaying is usually the wiser choice. Compare risk-adjusted return against the certain interest saving, not best-case against the loan rate.
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