How much is a 300k mortgage per month in the UK
  • December 15, 2025
  • Alex Walia
  • 0

To give you a detailed estimate of how much a £300,000 mortgage might cost per month in the UK, I’ll walk through the key factors and provide an example calculation.

Key Factors Affecting Monthly Mortgage Payments:

  1. Loan Amount: £300,000
  2. Interest Rate: This varies depending on the lender, type of mortgage, and your credit profile. Typical rates might range from 3% to 6% or more.
  3. Mortgage Term: Usually between 20 and 30 years. Common terms are 25 years.
  4. Type of Mortgage: Fixed-rate or variable (tracker or standard variable rate).
  5. Additional Costs: Sometimes, there are arrangement fees, insurance, etc., but for simplicity, we’ll focus on the core mortgage payments.

Example Calculation:

Let’s assume:

  • Loan Amount: £300,000
  • Interest Rate: 4% (fixed for simplicity)
  • Term: 25 years (300 months)

The formula for monthly repayments on a fixed-rate mortgage is:

M=P×r(1+r)n(1+r)n−1M = P \times \frac{r(1 + r)^n}{(1 + r)^n – 1}=P×(1+r)n−1r(1+r)n​

Where:

  • MM = monthly payment
  • PP = loan principal (£300,000)
  • rr = monthly interest rate (annual rate / 12)
  • nn = total number of payments (months)

Calculations:

  • r=4%/12=0.003333r = 4\% / 12 = 0.003333=4%/12=0.003333
  • n=25×12=300n = 25 \times 12 = 300=25×12=300

Plugging in:

M=300,000×0.003333×(1+0.003333)300(1+0.003333)300−1M = 300,000 \times \frac{0.003333 \times (1 + 0.003333)^{300}}{(1 + 0.003333)^{300} – 1}=300,000×(1+0.003333)300−10.003333×(1+0.003333)300​

Calculating this gives approximately:

M≈£1,580M \approx £1,580≈£1,580

Summary:

Assumption Estimated Monthly Payment
£300,000 loan at 4% fixed for 25 years £1,580

Important Notes:

  • Interest rates fluctuate, so your actual payment may differ.
  • If you choose a longer term (30 years) or a lower interest rate, your monthly payments will change.
  • Using a mortgage calculator online can help you customize the figures further based on current rates and specific terms.

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