Strategy

What to do with a lump sum

Quidsmith Guides · Updated 2026-07-03 · 6 min read

Windfalls arrive in Quidsmith when you least expect them: a work bonus, an inheritance, a life-event choice that pays off. A lump sum feels like a moment for a big decision. It is really a moment for a boring checklist.

The instinct is to pour it into whatever looks most exciting, usually stocks. But a lump sum does the most good when you spend it plugging holes in order of urgency. Here is a priority order that works well in the game.

1. Clear expensive debt

Paying off a debt charging 8% is a guaranteed 8% return, tax-free and risk-free. No investment in the game reliably beats that with certainty. If your starting loan or any high-interest balance is still hanging around, the lump sum's first job is to make it disappear. See should you pay off the initial debt for the full case.

2. Top up the emergency fund

Quidsmith fires unexpected events that hit your current account directly, and their cost grows as you age. If a shock lands and you cannot cover it, you are forced to liquidate investments, often at a bad time. A lump sum is a chance to build the buffer that stops that happening. Aim for enough to absorb a typical event without selling anything.

3. Capture free money in your pension

If you are still working, pension contributions come with tax relief and, for the workplace pension, an employer match. That match is an instant, guaranteed uplift you get nowhere else. Routing part of a lump sum toward pension top-ups (up to the annual allowance) is often the highest-return move on the board, even if the money is then locked until 57.

4. Fill your ISA

With debt gone, a buffer in place and the pension match captured, the remainder belongs in tax-free growth. The £20,000-a-year ISA allowance is use-it-or-lose-it, so a lump sum is the perfect way to fill it. Inside an ISA your Global ETF and gilts grow with no tax on gains, income or dividends.

5. Only then, the extras

Whatever is left can go to a taxable General Investment Account, an exotic like gold, or simply be enjoyed. There is nothing wrong with spending some of a windfall. The point of the order above is that by the time you reach this step, the money that needed to work hard already is.