ukcapitalgains

Work out the tax on your shares and savings.

Free calculators that follow HMRC's rules, and plain-English guides with worked examples. For UK investors outside an ISA or pension.

Work out your Capital Gains Tax →Tax on savings interest

Your trades and savings stay in your browser and are never sent to us.

ExampleTax year 2026–27
12 May 2025BuyWorld shares£16,000.00
20 Nov 2025BuyWorld shares£9,200.00
3 Mar 2026BuyGlobal fund£15,000.00
9 Jun 2026SellWorld shares£36,000.00
Gain on the sale£10,800.00
Capital Gains Tax£1,872.00
For a higher rate taxpayer. Paste your trades or import them from your broker, and the same-day, 30-day and Section 104 rules are applied for you.
Shares and funds

Capital Gains Tax calculator

Paste in your share trades to see your gains, your tax-free allowance and how much Capital Gains Tax is owed.

  • Matches your sales the way HMRC does, including the 30-day rule
  • Try out a sale before you make it
  • Shows the working, line by line

Reads exports from Trading 212, Freetrade, Hargreaves Lansdown, AJ Bell, Vanguard, Interactive Brokers and more.

Open the CGT calculator →
Savings, gilts and Premium Bonds

Tax on savings interest calculator

Add your savings accounts, cash ISAs, gilts and Premium Bonds to see what each leaves after tax, year by year.

  • Uses your Personal Savings Allowance and tax band
  • Shows when fixed-rate money becomes available
  • Compares yields on the same after-tax basis
Open the savings calculator →

The 2026–27 tax year at a glance

How Capital Gains Tax works →
Tax-free allowance
£3,000*of gains each, per tax year
Basic rate on shares
18%*on gains within the basic rate band
Higher rate on shares
24%*on gains above it
Tax return deadline
31 January 2028online, for gains in 2026–27

* Correct at the time of writing. Rates and allowances can change, so check HMRC's current Capital Gains Tax rates and tax-free allowance on GOV.UK.

Latest guides

All guides →
A woman at her kitchen table holds a phone showing a Bed and ISA screen, moving 2,000 shares worth £15,000 from a general investment account into a Stocks and Shares ISA.
New

What Is Bed and ISA, and Do You Pay Capital Gains Tax on It?

Why the sale in a Bed and ISA is taxed like any other, why the 30-day rule leaves the ISA purchase alone, and how to work out the gain.

Are Premium Bonds Worth It? Who They Suit, and Who They Don't

Do You Pay Capital Gains Tax When You Sell RSU Shares?

Do You Pay Capital Gains Tax on Shares You Inherit From Your Spouse?

Does Exchange Rate Affect CGT on US Shares?

New to Capital Gains Tax? Start here.

Short guides that cover most of what share investors need.

  1. 01How Capital Gains Tax on shares worksThe allowance, the rates and when you pay.
  2. 02Section 104: your average costHow HMRC pools your shares.
  3. 03The 30-day ruleWhy selling and buying back doesn't work.
  4. 04Reporting gains on SA108Which boxes to fill in, and when.

HMRC's rules, not rules of thumb

The same-day rule, the 30-day rule and the Section 104 pool, applied in HMRC's order. Every guide links to the GOV.UK pages it's based on.

Private by design

The calculators run on your own device. Broker files are read there too, and nothing you enter is uploaded.

Plain English, with the sums shown

Short guides with worked examples, checked against the calculator so the numbers agree.