£150,000 Savings at 4.5% — Tax on Interest 2025-26
Annual interest earned: £6,750 · Personal Savings Allowance applied
Tax breakdown — £150,000 savings at 4.5%
| Taxpayer band | PSA | Taxable interest | Tax owed | Net interest |
|---|---|---|---|---|
| Basic rate (salary ≤ £50,270) | £1,000 | £5,750 | £1,150 @20% | £5,600 |
| Higher rate (£50,270–£125,140) | £500 | £6,250 | £2,500 @40% | £4,250 |
| Additional rate (over £125,140) | Nil | £6,750 | £3,038 @45% | £3,712 |
Frequently asked questions
How much tax do I pay on interest from £150,000 savings at 4.5%?
Interest earned: £6,750/year. Basic rate taxpayer (salary under £50,270): tax £1,150, net interest £5,600 — the first £1,000 is covered by your Personal Savings Allowance. Higher rate taxpayer (salary £50,270-£125,140): tax £2,500, net £4,250 (PSA is only £500). Additional rate taxpayer (salary over £125,140): no PSA, tax £3,038, net £3,712.
What is the Personal Savings Allowance for 2025-26?
The PSA allows basic rate taxpayers to earn £1,000 in savings interest tax-free per year, and higher rate taxpayers £500. Additional rate taxpayers (over £125,140) have no PSA — all interest is taxed at 45%. ISA interest is always tax-free and does not count toward the PSA.
At 4.5%, what balance triggers a tax bill for a basic rate taxpayer?
A basic rate taxpayer's PSA covers £1,000 of interest. At 4.5% interest, this is used up at a balance of £22,222. With £150,000 at 4.5%, your interest is £6,750, so you exceed the PSA by £5,750, which is taxed at 20%, giving a bill of £1,150.
Should I put £150,000 in an ISA or savings account?
A cash ISA pays tax-free interest regardless of your tax band. A regular savings account uses your PSA first (but at 4.5% on £150,000 you earn £6,750, exceeding the basic rate PSA of £1,000). If you are a higher or additional rate taxpayer, an ISA is more valuable. Basic rate taxpayers may not benefit from an ISA if interest stays within their £1,000 PSA.