Data

Calculating Your Potential Refund: A Deep Dive into the Math

How is compensation actually calculated? We explain the formula used to determine how much you are owed.

The Car Finance Refund Team
November 26, 2025
2 min read

While every claim is unique, the methodology for calculating refunds is becoming standardised. Here is how the numbers work.

The Formula

Refund = (Interest Paid - Interest That Should Have Been Paid) + 8% Statutory Interest

Step 1: Determine the "Fair" Rate

The lender must disclose what the "Base Rate" was at the time. Let's say you paid 9%, but the base rate was 4%. The "unfair" portion is the 5% difference.

Step 2: Recalculate the Loan

They run a simulation of your loan as if it had been at 4%.

  • At 9%, you might have paid £2,000 in total interest.
  • At 4%, you would have paid £900.
  • The difference is £1,100.

Step 3: Add Statutory Interest

You were deprived of that £1,100 for years. The courts award 8% simple interest per year on that money as compensation.

If the loan was 4 years ago, that could add another £300-£400 to your total.

Variables

  • Loan Size: Larger loans generate larger refunds.
  • Duration: Longer loans accrue more compound interest.
  • Date: Older loans have accrued more statutory interest.
Written By

The Car Finance Refund Team

A collective of consumer rights advocates, legal researchers, and software engineers dedicated to helping UK drivers reclaim unfair car finance commissions.

Disclaimer: This content is for informational purposes only and does not constitute legal or financial advice.

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