ISA & Savings Calculator 2026/27

ISA & Savings Calculator

✓ Verified for 2026/27

Savings Details

£
£
Maximum standard ISA allowance is £20,000 per tax year.
%
years
Final Balance
£0
at term end
Total Contributed
£0
your deposits
Total Growth
£0
earned interest
Total Return %
0%
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.
🛡️
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

  1. Input variables: Enter the relevant amounts, rates, or percentages in the form.
  2. Real-time breakdown: The calculator applies HMRC rules and thresholds for the 2026/27 tax year to process the values.
  3. 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

Pension CalculatorInheritance Tax CalculatorPension Carry Forward CalculatorIncome Tax Calculator

Frequently Asked Questions & Detailed Tax Guide

What is an Individual Savings Account (ISA)?

An Individual Savings Account (ISA) is a tax-free wrapper for your savings and investments in the UK. Under HMRC rules, you do not pay any Income Tax on interest earned, dividend tax on stocks, or Capital Gains Tax on any investment growth inside an ISA. For the 2026/27 tax year, the combined annual ISA allowance is capped at **£20,000**. You can split this allowance across different types of ISAs, including Cash ISAs, Stocks & Shares ISAs, Innovative Finance ISAs, and Lifetime ISAs.

Step-by-Step Mathematical Calculation: ISA vs. Taxable Account

Let’s compare the growth of £20,000 saved at a 5% interest rate over 5 years for a higher-rate (40%) taxpayer who has already used their £500 Personal Savings Allowance, comparing an ISA wrapper against a standard taxable savings account:

  • 1. Standard Taxable Account: Interest is subject to 40% income tax.
    – Stated interest rate: 5%.
    – Net interest rate after tax: 5% * (1 – 0.40) = 3% per annum.
    – Compound growth over 5 years: £20,000 * (1.03)^5 = **£23,185**.
  • 2. Tax-Free ISA Account: No tax applies.
    – Net interest rate: 5% per annum.
    – Compound growth over 5 years: £20,000 * (1.05)^5 = **£25,526**.
  • 3. Total Savings with ISA: £25,526 – £23,185 = **£2,341 extra cash** due to the ISA tax shield.

Tax Expert Pro-Tips: The Lifetime ISA 25% Government Bonus

David Vance, CTA FCA, recommends: “If you are aged between 18 and 39 and saving to buy your first home (valued up to £450,000), you should utilize a Lifetime ISA (LISA). You can save up to £4,000 per year inside a LISA, and the government will add an automatic **25% bonus** (up to £1,000 per year) completely tax-free. However, be aware that if you withdraw the money for any purpose other than buying a first home or retirement after age 60, you will trigger a 25% withdrawal penalty, losing the bonus and a portion of your original capital.”

Legislative References

  • Individual Savings Account Regulations 1998 – Primary statutory framework governing ISA limits and structures.
  • Savings (Government Contributions) Act 2017 – Establishes the Lifetime ISA bonus and penalty guidelines.