Mortgage affordability calculator

Enter your pay, the share of it a lender would let go on repayments, the rate and the term. You get the most you could borrow and, with your deposit, the price of home you could afford.

Rates in force from 1 Sept 2026 · checked 25 Sept 2026 · source · source · source · source

An estimate for planning, not financial advice. A lender's own checks decide what you can borrow.

How it works

Lenders look at how much of your take-home pay would go on repayments, other loans included. The share they accept, their rate and their longest term vary, so every figure here is yours to change.

The most you could borrow is the loan whose monthly repayment, at the rate and term you enter, fits in that share. Pay before tax is turned into take-home pay with the current PAYE bands and SSNIT.

Questions people ask

How is the amount I can borrow worked out?: Take the share of take-home pay a lender allows for repayments, less any other loan repayments. The most you can borrow is the loan that monthly sum would repay at the rate and over the term: payment × (1 − (1 + r)^−n) ÷ r, where r is the monthly rate and n the number of months.
Does a longer term mean I can borrow more?: Yes, but less than you might think at high rates: most of each early repayment goes on interest, so adding years adds less and less to what you can borrow, and a lot to what you repay.

How it works

Lenders look at how much of your take-home pay would go on repayments, other loans included. The share they accept, their rate and their longest term vary, so every figure here is yours to change.

The most you could borrow is the loan whose monthly repayment, at the rate and term you enter, fits in that share. Pay before tax is turned into take-home pay with the current PAYE bands and SSNIT.

Questions people ask

How is the amount I can borrow worked out?

Take the share of take-home pay a lender allows for repayments, less any other loan repayments. The most you can borrow is the loan that monthly sum would repay at the rate and over the term: payment × (1 − (1 + r)^−n) ÷ r, where r is the monthly rate and n the number of months.

Does a longer term mean I can borrow more?

Yes, but less than you might think at high rates: most of each early repayment goes on interest, so adding years adds less and less to what you can borrow, and a lot to what you repay.