What is the annual UK ISA allowance for 2025/2026?

The statutory annual ISA allowance is £20,000 per person per tax year. This limit can be split across Stocks & Shares ISAs, Cash ISAs, Innovative Finance ISAs, and up to £4,000 into a Lifetime ISA (LISA).

How does the Lifetime ISA (LISA) 25% government bonus work?

UK residents aged 18 to 39 can open a Lifetime ISA and save up to £4,000 each tax year. The government adds a 25% cash bonus on all contributions, meaning a maximum annual bonus of £1,000 per year until age 50.

What is the penalty for withdrawing money from a Lifetime ISA?

If you withdraw funds from a Lifetime ISA for any purpose other than buying your first residential home valued at £450,000 or less, or reaching age 60, HMRC charges a 25% government withdrawal penalty on the total amount withdrawn. This claws back the bonus plus a 6.25% penalty on your original deposited principal.

Are ISA returns completely free of UK Capital Gains and Dividend Tax?

Yes. All capital gains, share dividends, and savings interest generated inside an Individual Savings Account (ISA) are 100% tax-free. You do not need to declare ISA earnings on your HMRC Self Assessment tax return.

£20,000 Annual Allowance • 25% Lifetime ISA Bonus

UK ISA & Lifetime ISA (LISA) Calculator

Simulate long-term compound growth for Stocks & Shares ISAs, Cash ISAs, and Lifetime ISAs. Project your 25% government bonus, first-home house deposit, and tax shielded from HMRC.

1 ISA Type & Contribution Strategy Max £20k/yr

Account Structure

Starting Balance (£)

Monthly Contribution (£)

Annualised: £4,000.00 / yr

Investment Duration 5 years

1 yr 5 yrs (First Home) 15 yrs 30 yrs (Retirement)

2 Expected Return & Fees

Expected Annual Return (%)

Cash: ~4-5%, S&P 500 / Global: ~7-9%

Platform & Fund OCF Fee (%)

Typical low-cost index tracker: ~0.15% - 0.45%

HMRC 25% Unauthorised Withdrawal Penalty

Withdrawing for any purpose other than buying a qualifying first home (up to £450,000) or retirement after age 60 triggers a 25% penalty on the total pot. Because the penalty applies to bonus + growth, you lose 6.25% of your original deposited cash!

Unauthorised Withdrawal Net Loss: -£1,562.50

Projected Total ISA Pot 100% Tax-Free

£29,380.00

Zero Capital Gains Tax, zero Dividend Tax, zero UK Income Tax on withdrawals.

Total You Deposit £20,000.00

Investment Growth £4,380.00

Pot Composition Breakdown

Personal Cash Contributed: £20,000.00

Lifetime ISA 25% Government Bonus: +£5,000.00

Net Compound Growth (After Fees): +£4,380.00

Platform & Fund Fees Paid: -£312.40

Estimated Tax Shielded vs GIA (CGT + Div): ~£1,240.00

Final Tax-Free Lump Sum: £29,380.00

Year-by-Year Growth Trajectory

Year	Deposits	Bonus	Pot Value

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Lifetime ISA (LISA)

For UK first-time buyers aged 18-39 buying a property under £450,000, or for retirement at 60. Enjoy £1,000 free bonus every year you deposit £4,000.

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Stocks & Shares ISA

Invest up to £20,000/year into global index funds, UK shares, or bonds. Completely protects all capital gains and dividends from HMRC tax.

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Cash ISA

Zero investment risk. Earn tax-free interest on deposits up to £20,000/year, protecting you from breaching the Personal Savings Allowance (£1,000 basic / £500 higher).

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