Effect of 1% Rate Difference Over Time

How a small difference in Interest Rate builds up over time.

Impact of a 1% Interest Rate Difference on a £200,000 Mortgage

Mortgage Details:

  • Loan Amount: £200,000
  • Interest Rates: 3% vs. 4%
  • Loan Terms: 25 years, 30 years, 35 years

Calculations:

1. Mortgage Term: 25 Years

  • Monthly Payment at 3% Interest: £948.42
  • Monthly Payment at 4% Interest: £1,055.67
  • Total Payment at 3% Interest: £948.42 * 300 months = £284,526
  • Total Payment at 4% Interest: £1,055.67 * 300 months = £316,701
  • Difference in Total Payment: £316,701 – £284,526 = £32,175

2. Mortgage Term: 30 Years

  • Monthly Payment at 3% Interest: £843.21
  • Monthly Payment at 4% Interest: £954.83
  • Total Payment at 3% Interest: £843.21 * 360 months = £303,555
  • Total Payment at 4% Interest: £954.83 * 360 months = £343,739
  • Difference in Total Payment: £343,739 – £303,555 = £40,184

3. Mortgage Term: 35 Years

  • Monthly Payment at 3% Interest: £770.60
  • Monthly Payment at 4% Interest: £888.47
  • Total Payment at 3% Interest: £770.60 * 420 months = £323,652
  • Total Payment at 4% Interest: £888.47 * 420 months = £373,157
  • Difference in Total Payment: £373,157 – £323,652 = £49,505

Summary Table:

Loan Term Monthly Payment at 3% Monthly Payment at 4% Total Payment at 3% Total Payment at 4% Difference
25 Years £948.42 £1,055.67 £284,526 £316,701 £32,175
30 Years £843.21 £954.83 £303,555 £343,739 £40,184
35 Years £770.60 £888.47 £323,652 £373,157 £49,505

This example illustrates that even a small difference in interest rates can lead to significant savings over the life of a mortgage. A lower interest rate not only reduces your monthly payments but also decreases the total amount of interest paid over the term of the loan.

This can also be shown on a graph – the longer your mortage is for, the more a 1% higher rate will cost you!

Graph of savings on different repayment lifetimes

Key take away:  Small amounts make big differences over time!

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