Is this calculator updated for the 2026/27 tax year?

Yes, all calculators are fully updated with the latest HMRC thresholds, personal allowances, and National Insurance rates for 2026/27.

Can I use this for official tax submissions?

These tools are for estimation and illustrative purposes only. For official tax returns, please consult a qualified accountant or reference HMRC directly.

Free ISA & Savings Tax Calculator 2026/27: Compound Interest

ISA & Savings Calculator

✓ Verified for 2026/27

Savings Details

Initial Investment

Monthly Deposit

Maximum standard ISA allowance is £20,000 per tax year.

Expected Annual Return (%)

Investment Term (Years)

years

Final Balance

£0

at term end

Total Contributed

£0

your deposits

Total Growth

£0

earned interest

Total Return %

on total contributions

Savings breakdown

Initial Deposit £0

Total Monthly Deposits £0

Total Contributions £0

Investment Growth £0

Investment Term 0 years

Final ISA Value £0

Growth over Term

ℹ️ Individual Savings Accounts (ISAs) are tax-free wrappers. Any growth or dividend yield generated inside a UK ISA is entirely exempt from Capital Gains Tax and Income Tax. The annual ISA allowance for the 2026/27 tax year is capped at £20,000.

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Verified for Accuracy (2026/27 Tax Year)

Fact-checked and audited by David Vance, CTA FCA, Chartered Tax Advisor & Accountant. Verified against official HMRC rules.

How We Calculated This

Input variables: Enter the relevant amounts, rates, or percentages in the form.
Real-time breakdown: The calculator applies HMRC rules and thresholds for the 2026/27 tax year to process the values.
Display outputs: The visual graphs, donut charts, and tables are compiled dynamically to show your net take-home and deductions.

Real-World Examples

Standard Scenario

A basic calculation applying standard UK tax bands and allowances.

Calculation runs based on standard HMRC rules.

With Pension or Deductions

Factoring in a percentage of salary sacrifice or pension contributions.

Deductions are calculated and adjusted accordingly.

Related Calculators

Frequently Asked Questions

What are the annual ISA limits and how do the tax benefits work?

An Individual Savings Account (ISA) is a tax-free wrapper for your savings and investments. For the 2026/27 tax year, the maximum annual ISA allowance is £20,000. You can save or invest up to £20,000 across Cash ISAs, Stocks & Shares ISAs, Innovative Finance ISAs, and Lifetime ISAs. All interest earned on cash savings, dividend payouts on stocks, and capital gains on investments held within an ISA wrapper are completely exempt from UK tax and do not need to be declared to HMRC. The allowance does not roll over to the next tax year, so it is a ‘use it or lose it’ tax benefit.

What is the Personal Savings Allowance vs. a Lifetime ISA?

If you save money in standard, non-ISA bank accounts, your interest is subject to the Personal Savings Allowance (PSA). Basic rate taxpayers can earn £1,000 of savings interest tax-free per year, higher rate taxpayers can earn £500, and additional rate taxpayers receive £0. Any interest exceeding these limits is taxed at your standard income tax rate. A Lifetime ISA (LISA) is a specialist account for individuals aged 18 to 39 saving for their first home (valued up to £450,000) or retirement. You can deposit up to £4,000 per year as part of your overall £20,000 ISA limit, and the government adds a 25% bonus (up to £1,000 annually) to your savings. However, withdrawing money for other reasons incurs a 25% government penalty, clawing back the bonus and some of your own savings.