First-home planning · Free · No sign-up

First-Time Buyer Mortgage Calculator

Explore an illustrative borrowing range and deposit position. The Lifetime ISA bonus is shown only when the qualifying-use checks you confirm are met.

Plan your first-home budget

Combined annual gross income

Deposit saved outside your current-year LISA contribution

Expected property price

This tax year's LISA contribution

The annual contribution limit is £4,000 and the maximum annual government bonus is £1,000.

I confirm all buyers are first-time buyers, the account has been open at least 12 months and the purchase will use a mortgage

A qualifying LISA first-home withdrawal must also be for a property costing no more than £450,000. If this condition is not met, this tool does not add a bonus.

Lifetime ISA checks before using the result

A Lifetime ISA can be used towards a first home or later life. You can contribute up to £4,000 a year until age 50 and receive a 25% bonus. The rules are detailed, so this calculator does not determine every condition.

The first LISA payment must have been made before age 40.
For a first-home withdrawal, the property price must not exceed £450,000.
Confirm the account-open period and all buyer eligibility rules with your provider before exchange.
Use the Property Tax Calculator to plan SDLT, LBTT or LTT separately.

Sources

Last checked: 2026-08-13. This is a planning guide, not personal financial advice.