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Estimate what you may keep from savings interest after UK tax for 2026/27.
Restoring your saved savings inputs…
£0–£100,000,000
£0–£100,000,000
Enter an annual rate from 0–100%.
Editable sample. Change the inputs to see your estimate; Reset restores this example.
Local estimate shown from these inputs; the UK calculation service has not returned a matching result yet.
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Annual interest split between tax-free amounts and interest taxed
| Treatment | Amount |
|---|---|
| Personal Allowance | £0 |
| Starting Rate for Savings | £0 |
| Personal Savings Allowance | £500 |
| Interest taxed | £350 |
Tax on taxable interest slices; the table also shows any Personal Allowance taper effect
| Band | Taxable interest | Rate | Tax |
|---|---|---|---|
| Basic rate savings | £0 | 20% | £0 |
| Higher rate savings | £350 | 40% | £140 |
| Additional rate savings | £0 | 45% | £0 |
| Extra tax from reduced Personal Allowance | — | — | £0 |
Estimated year-end balance (£); annual interest flows are not plotted as balances
| Year | Gross interest | Tax | Net interest | Ending balance |
|---|---|---|---|---|
| Year 1 | £850 | £140 | £710 | £20,710 |
| Year 2 | £880 | £152 | £728 | £21,438 |
| Year 3 | £911 | £164 | £747 | £22,185 |
| Year 4 | £943 | £177 | £766 | £22,950 |
| Year 5 | £975 | £190 | £785 | £23,736 |
Illustration only: holds this year’s income, tax rules and AER constant for five years; monthly deposits, if any, are assumed to arrive evenly through each year.
Annual net interest using the same gross interest in both scenarios
| Scenario | Gross interest | Estimated tax | Net interest |
|---|---|---|---|
| Cash ISA (illustrative) | £850 | £0 | £850 |
| Taxable account | £850 | £140 | £710 |
| ISA net-interest advantage | — | — | £140 |
This assumes the same gross interest in both accounts. It does not compare provider rates, ISA subscription eligibility, access or product features.
Interest on UK savings accounts may be taxable after the Personal Allowance, Starting Rate for Savings and Personal Savings Allowance. This 2026/27 calculator estimates tax on gross interest using the details entered below.
Enter gross annual employment income and either annual gross interest or a savings balance and AER. The estimate applies the Personal Allowance, Starting Rate for Savings and Personal Savings Allowance, then shows estimated tax and net interest. It does not include other income, pension contributions, Gift Aid or every relief that can affect your tax position.
Employment income here means gross pay in a simplified model; benefits, dividends, rental income, multiple jobs and some Scottish interactions are not included. In Annual Interest mode, enter total gross interest across taxable accounts. The five-year projection holds income, allowances, 2026/27 tax rates and AER constant; it does not model the enacted increase in savings rates from 6 April 2027 (22% basic, 42% higher and 47% additional). The Cash ISA comparison assumes equal gross interest and does not compare provider rates, ISA eligibility or subscription limits.
These official UK sources support the savings tax, allowance, ISA and Premium Bond explanations on this page. The calculator is an estimate and does not replace HMRC or regulated financial advice.