Mortgage Calculator UK

Calculate UK mortgage repayments for repayment and interest-only mortgages, including Stamp Duty Land Tax (SDLT) estimates.

Calculator Inputs

£
Property price in pounds.
£
Cash deposit (typically 10-20%).
%
Fixed or variable rate.
Repayment length.

Calculated Results

Monthly UK Mortgage Repayment
GBP 1,518.22 / month
Stamp Duty (SDLT) Liability GBP 2,500.00
Interest-Only Monthly Payment GBP 1,062.50 / mo
Loan-to-Value (LTV) 85.0%
Values calculate live as you adjust inputs.

About Mortgage Calculator UK

Calculates UK residential home repayment and interest-only mortgage payments in pounds sterling, accounting for HMRC Stamp Duty.

What is Mortgage Calculator UK?

Calculates UK residential home repayment and interest-only mortgage payments in pounds sterling, accounting for HMRC Stamp Duty.

How to Use This Calculator

  1. Enter property price and deposit in GBP.
  2. Enter mortgage interest rate.
  3. Select term length (typically 25 years).
  4. View monthly repayment and estimated Stamp Duty.

The Mathematical Formula & Variables

Repayment = Loan * (r * (1 + r)^n) / ((1 + r)^n - 1)

Step-by-Step Worked Example

Scenario: £300,000 house with £45,000 deposit (£255k loan) at 5% over 25 years.

  1. r = 0.05 / 12 = 0.004167; n = 300 months.
  2. Monthly repayment = £1,490.72.
  3. Stamp Duty on £300,000 for standard mover = £2,500.

Result: GBP 1,490.72 / month

Frequently Asked Questions

Are first-time buyers exempt from Stamp Duty in the UK?

First-time buyers in England and Northern Ireland pay 0% Stamp Duty on properties up to £425,000.