First-Time Buyer Calculator

Mortgage Calculator
Estimate your monthly mortgage payments and total cost over the full term.

Switch between repayment and interest-only.

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Navigating Your First Home Purchase

Buying your first home is an exciting milestone. This calculator helps you understand the potential monthly costs involved. As a first-time buyer, there are several key things to consider.

The Deposit

Your deposit is the amount you pay upfront. A larger deposit means you borrow less, which results in lower monthly payments and often gives you access to better interest rates. Many first-time buyer schemes are designed to help with this hurdle.

Loan-to-Value (LTV)

This is the ratio of your mortgage loan to the property's value. For example, if you buy a £200,000 home with a £20,000 deposit, you are borrowing £180,000, which is a 90% LTV. Lenders use this to assess risk.

Additional Costs

Remember to budget for other costs beyond the deposit, such as legal fees, valuation fees, and stamp duty (though first-time buyers often get relief on this). These are not included in this calculator but are an important part of the overall cost.

Logic & Formulas

The monthly payment is calculated using the standard loan amortization formula. The calculator first determines the total loan amount by subtracting the deposit from the property value.

M = P [ i(1 + i)^n ] / [ (1 + i)^n – 1 ]

Where:

  • M = Monthly Payment
  • P = Principal Loan Amount (Property Value - Deposit)
  • i = Monthly Interest Rate (Annual Rate / 100 / 12)
  • n = Number of Payments (Loan Term in Years * 12)

For "Interest Only" mortgages, the calculation is simpler: Monthly Payment = P * i.