Fifty thousand pounds is the kind of sum people reach after decades of saving, an inheritance or the sale of a flat. The question that follows is almost always the same: how much can it pay me every month, while the £50,000 itself stays intact? The honest answer ranges from about £105 to about £178 before tax, and the popular rule of thumb that promises more works by spending the pot.
What £50,000 can pay you each month
The arithmetic is simple: capital multiplied by the annual rate, divided by twelve. What changes the result is where the money sits. Using Moneyfacts market averages for September 2026, a typical easy-access account pays 2.53% and a typical one-year fixed bond 4.28%.
£50,000 at 4.28% is £2,140 a year, or £178.33 a month, paid entirely from interest. Only the interest is spent, so the £50,000 is still there when the bond matures, and all of it sits within the £120,000 the FSCS protects per person at each banking licence.
The catch is the word "fixed". The money is locked for the year, and the rate on offer when it matures may be lower: Bank Rate has stood at 3.75% since December 2025. Some bonds pay interest monthly, usually at a slightly lower gross rate than annual interest.
The rule of 300, and why it spends your savings
A popular shortcut says you need £300 of capital for every £1 of monthly income. On that rule, £50,000 supports about £167 a month, and £1,000 a month needs £300,000. It sounds like a yield. It is not.
The rule is a rewording of the 4% rule, devised by the American financial planner William Bengen in 1994 from US market history going back to 1926: withdraw 4% of a portfolio in the first year, raise it with inflation, and the money historically lasted at least 30 years. Withdrawing 4% a year is a plan to run the pot down slowly, not to live on its interest, and it assumes the portfolio is invested in shares and bonds, not held in cash.
What you actually keep after tax
Interest is taxable above the Personal Savings Allowance. On the £2,140 from the fixed bond, assuming no other savings interest:
- A basic-rate taxpayer keeps about £159 a month: the first £1,000 is tax-free and 20% is due on the other £1,140.
- A higher-rate taxpayer keeps about £124 a month: the allowance falls to £500 and 40% is due on £1,640.
- An additional-rate taxpayer keeps about £98 a month: there is no allowance, and 45% is due on all of it.
Interest inside a cash ISA is tax-free, but the annual allowance is £20,000, so £50,000 cannot all go in at once, and from April 2027 savers under 65 can put only £12,000 a year into cash. Spreading it over several tax years, or between partners, is the usual answer.
Three ways to keep the income coming without selling
- Ladder fixed-term accounts: split the money across bonds maturing at different dates, so part of it is always close to being free and you are never relying on one renewal rate.
- Use the tax wrappers: fill cash ISAs over time and use both partners' Personal Savings Allowances, so more of the interest is yours.
- Take income, not units: if you invest, choose income-paying funds, dividend shares or bonds held to maturity, and spend what they pay out rather than selling holdings. Unlike savings, these can fall in value.
Keep an emergency fund in easy access before locking anything away. And remember inflation: with CPI at 3.1% in the year to August 2026, the £50,000 you never touch will buy a little less each year, so reinvesting part of the interest is what genuinely preserves it. Our guide to the best current accounts covers where to keep the everyday buffer, and our guide to UK banks compares the main providers.