Sinking Fund
Plain-English definition of Sinking Fund — part of our saving glossary.
Definition
A sinking fund is a dedicated savings pot for a predictable future expense — Christmas, a car replacement, annual insurance. Separate from the emergency fund because the spending is planned, not unexpected.
Worked example
A household with predictable annual costs of £1,200 car insurance, £600 Christmas, £400 MOT/service, and £300 birthdays runs a sinking fund of £208/month split into named pots. Comes payday, every category is already funded — no December credit card panic, no January “where did that come from”.
Why it matters
Savings are the foundation of everything else — you cannot invest, buy a home, or weather a redundancy without a cash buffer. Even modest sums build meaningful resilience if they are parked in the right wrapper and left alone.
Common mistake
Leaving large balances in a current account earning 0–1% is one of the most expensive "default decisions" in personal finance. Over a few years, the opportunity cost versus a simple easy-access account regularly runs into the hundreds of pounds per £10,000 held.
Calculators that use this concept
See also
- AER (Annual Equivalent Rate) — AER is the savings equivalent of APR — the rate of interest you earn on a savings account assuming interest is…
- ISA (Individual Savings Account) — An ISA is a UK tax-free savings or investment wrapper. You can contribute up to £20,000 per tax year across Ca…
- Emergency Fund — An emergency fund is cash set aside specifically for income interruption or unexpected major expenses — typica…
- Premium Bonds — A UK government-backed savings product where returns come as tax-free prize wins rather than fixed interest. T…