UK Savings & Compound Interest Calculator (2026/27)

An initial deposit of £10,000 with £250 monthly contributions at 5.0% AER earns £4,835.11 in compound interest over 5 years, reaching a final balance of £29,835.11.

Initial Deposit (+£250/mo for 5 Yrs at 5.0% AER) Total Interest Earned Final 5-Year Balance
£5,000 Initial Deposit £3,418.31 £23,418.31
£10,000 Initial Deposit £4,835.11 £29,835.11
£20,000 Initial Deposit £7,668.69 £42,668.69
£50,000 Initial Deposit £16,169.45 £81,169.45

Frequently Asked Questions (2026/27 & 2027/28 UK Rules)

What is the UK Personal Savings Allowance (PSA) for 2026/27?

Basic rate taxpayers can earn up to £1,000 of savings interest tax-free per year, Higher rate taxpayers receive a £500 allowance, and Additional rate taxpayers (£125,140+) receive £0.

Authoritative UK Calculators & 2027/28 Early Access