ISAs UK: Cash, Stocks & Shares, Lifetime, Junior and Transfer Rules

Lifetime ISA Calculator UK — How Much Government Bonus Will I Get?

Calculate your Lifetime ISA government bonus for 2026/27. Find out how much you can contribute, how the 25% bonus is applied, and when you can access your money without penalty.

Savings and investment information is for educational purposes only. The value of investments can go down as well as up. Cash savings up to £85,000 per person per institution are protected by the FSCS.

The Lifetime ISA (LISA) is one of the government’s most generous savings incentives — a 25% bonus on every pound you save, up to £4,000 per year. This guide explains exactly how the bonus is calculated, when you can access your money, and how the LISA compares with other first-home and retirement saving options.

For the full PocketWise guide to ISA types and allowances, see the ISA Hub.

How the Lifetime ISA bonus works

Contribution Government bonus (25%) Total in account
£1,000 £250 £1,250
£2,000 £500 £2,500
£3,000 £750 £3,750
£4,000 (maximum) £1,000 £5,000

The bonus is added automatically — you do not need to claim it. It is paid monthly (for most providers), and it earns interest or investment returns alongside your own contributions.

Annual limit: £4,000 per tax year
Annual bonus maximum: £1,000
Lifetime bonus maximum: £33,000 (if you open at 18 and contribute the maximum until age 50)

Bonus over time: the long-term picture

Years contributing £4,000/year Total contributed Total bonus earned Total value (ex-investment growth)
5 years £20,000 £5,000 £25,000
10 years £40,000 £10,000 £50,000
20 years (from age 18 to 38) £80,000 £20,000 £100,000
32 years (from age 18 to 50) £128,000 £32,000 £160,000

These figures are before investment growth. A Stocks and Shares LISA invested in a globally diversified fund could grow the balance significantly over 20–30 years.

Using a LISA to buy your first home

The LISA is specifically designed to help first-time buyers get onto the property ladder. The rules:

Requirement Detail
Property price limit £450,000 or less
Who can use it First-time buyer only
Account age LISA must have been open at least 12 months
How it is used Funds transferred directly to conveyancer at completion
Joint purchase Both buyers can use their own LISA

Example: A couple both aged 26, each with a LISA open for 3 years and each contributing £4,000/year:

  • Each person: £12,000 contributed + £3,000 bonus = £15,000 per LISA
  • Combined: £30,000 available for deposit from LISA alone

If each LISA is also invested and earns 5% annually over 3 years (rough estimate), the combined value could be closer to £32,000–£33,000.

The 25% withdrawal penalty explained

If you withdraw money for an ineligible reason, a 25% withdrawal charge applies to the total balance (contributions + bonus).

Why this is worse than it sounds:

  • You contribute £4,000 and receive a £1,000 bonus → balance is £5,000
  • A 25% charge takes £1,250 from £5,000 → you receive £3,750
  • You put in £4,000 and get back £3,750 — a net loss of £250 on your own money

This is not a bug, it is intentional — the LISA is meant to be locked away for a specific purpose. The penalty acts as a disincentive to treat it as a general savings account.

Eligible withdrawal reasons (no penalty):

  • Buying a qualifying first home
  • Turning 60
  • Terminal illness

Ineligible reasons (25% penalty applies):

  • Emergencies
  • Buying a second property or a property over £450,000
  • Early retirement before 60 (unless terminally ill)

LISA vs pension: which to prioritise?

Feature Lifetime ISA Workplace pension
Government top-up 25% bonus 20%–45% tax relief
Employer contributions None At least 3% (auto-enrolment)
Access age 60 (or first home) 57 (rising from 55)
Annual limit £4,000 £60,000
Penalty for early access 25% charge No — just tax on withdrawals
Counts towards ISA allowance Yes No

The general rule: If you have a workplace pension with employer contributions, prioritise contributing enough to get the full employer match first — it beats the LISA bonus on a pound-for-pound basis. The LISA is then best used as a first-home savings vehicle or as a secondary retirement savings tool after maximising employer-matched pension contributions.

Cash LISA vs Stocks and Shares LISA

Type Best for Risk Returns
Cash LISA Buying a home in the next 1–5 years Low Savings interest (current accounts typically 3–5% AER)
Stocks and Shares LISA Retirement savings or long-term first-home saving (5+ years) Higher Potential for inflation-beating growth over time

For a house purchase within a few years, a Cash LISA protects your balance. For longer time horizons, a Stocks and Shares LISA can significantly outperform the bonus on a cash LISA.

Sources

  1. GOV.UK — Lifetime ISA
  2. HMRC — Lifetime ISA technical note
  3. MoneyHelper — Lifetime ISA