Start With Two Numbers, Not a Feeling

Almost every “should I overpay or save?” question comes down to comparing two percentages: the rate you are paying on your loan and the rate you are earning on your savings. If the loan costs more than the savings pay, overpaying usually wins. If your savings pay more, saving usually wins.

The comparison sounds simple, and it largely is — but there is a third number people forget, and it can flip the answer entirely: the early repayment charge. Get all three in front of you before you move any money.

Work Out What Your Loan Really Costs You

Look at your loan agreement rather than your memory. The figure that matters is the interest rate applied to the outstanding balance, not the headline amount you borrowed or the monthly payment. The APR is useful for comparing deals at the outset, but once you are mid-term, the balance and the rate are what count.

Two details are worth checking carefully:

• Whether interest is calculated daily. Most personal loans calculate interest on the reducing balance, so an overpayment made early in the month reduces the interest added at the end of it. Every day you delay has a small cost.
• Any early repayment charge. Fixed-rate personal loans often allow overpayments up to a limit — commonly around £1,000 or 10% of the balance a year — without penalty. Above that, or if you clear the loan entirely, you may be charged. Ask your lender for an early settlement figure in writing. It is usually valid for a limited period, so don’t request it months in advance.

Regulated personal loans give you a statutory right to settle early, and the rules limit how much interest a lender can charge you for doing so. That protection is real, but it is not the same as being free of charge — always get the exact figure.

Work Out What Your Savings Really Earn

Now the other side. Advertised savings rates are usually gross, quoted as an AER, and tax may be taken off the interest you earn.

Most people have a Personal Savings Allowance: £1,000 of interest a year for basic-rate taxpayers, £500 for higher-rate, and nothing for additional-rate taxpayers. If the interest on your savings stays under your allowance, the advertised rate is what you get. If it spills over, the excess is taxed at your marginal rate.

As a rough guide, a 4.5% savings account pays about 3.6% to a basic-rate taxpayer once tax applies, and about 2.5% to an additional-rate taxpayer. Interest held in a cash ISA is tax-free, so an ISA at 4% can beat a taxable account at 4.5%.

The Straightforward Comparison

Put the two figures side by side and the decision often makes itself:

• Loan at 8.9%, savings at 4.5% gross. Overpaying wins comfortably. The return is guaranteed, tax-free and instant.
• Loan at 3.9%, ISA at 4.5% tax-free. Saving wins on paper, though the gap is small and savings rates move around.
• Loan at 6%, savings at 5% but with an early repayment charge of two months’ interest. Do the sums on the charge before overpaying aggressively — it can wipe out a year of advantage.

Think of overpaying as a risk-free, tax-free return equal to your loan rate. Very few savings accounts can promise that, which is why clearing debt is so often the stronger move.

Build a Small Buffer First

Before you send every spare pound to your lender, make sure you have a cushion. Aim for at least one to three months’ essential outgoings in an easy-access account, and more if your income is variable or you are self-employed.

The reason is simple: money paid into a loan is very hard to get back. If the boiler fails or your hours are cut, you would have to borrow again — often at a worse rate than the loan you just cleared. A modest buffer is not a detour from good financial sense; it is part of it.

Putting It Into Practice

• Check your outstanding balance, your rate and your overpayment limit today.
• Request an early settlement figure if you are thinking of clearing the loan in full.
• Compare the loan rate with the after-tax rate on your savings.
• Fund a small emergency buffer, then direct spare cash to whichever rate is higher.
• When you overpay, ask whether it reduces your term or your monthly payment. Reducing the term saves more interest.
• Review every six months, or whenever savings rates or your loan rate change.

One more thing worth knowing: clearing a loan reduces your committed monthly outgoings, which can help when a mortgage lender assesses your affordability later. And if the numbers are genuinely close, splitting your spare cash between the two is a perfectly sensible answer — you make progress on the debt while keeping some flexibility in reserve. There is no prize for choosing the theoretically perfect option if a slightly imperfect one helps you sleep at night.