Mis-Sold Mortgage Calculator
Overpayment Estimate
Monthly Overpayment-
Total Interest Overpaid-
Excess Fees-
Statutory Interest (8%)-
Total Estimated Claim-
Common Mis-Sold Mortgage Scenarios
| Type | Description | Typical Claim |
|---|---|---|
| Interest-Only | No repayment vehicle arranged | £5,000–£50,000 |
| Wrong Product | Fixed when tracker better (or vice versa) | £2,000–£20,000 |
| Unaffordable | Lending beyond means | £5,000–£100,000+ |
| Hidden Fees | Undisclosed broker commissions | £1,000–£10,000 |
Key Facts
FOS Limit
£430,000
Claim Window
6 Years
Statutory Interest
8%
How to Use This Calculator
1
Enter original mortgage amount
The total amount borrowed on the mortgage.
2
Enter the rate you paid
The interest rate on the mortgage product you were sold.
3
Enter the fair rate
The rate you should have been offered based on your circumstances.
4
Enter years on wrong product
How long you were on the unsuitable mortgage before switching or discovering the issue.
5
Review your overpayment
See monthly overpayment, total excess interest, and claim with statutory interest added.
Frequently Asked Questions
How do I know if my mortgage was mis-sold?
Signs include: being sold interest-only without a repayment plan, a product that did not match your needs or risk profile, undisclosed fees or commissions, lending more than you could afford, or not being told about early repayment charges.
Can I still claim for an old mortgage?
You have 6 years from the event, or 3 years from when you became aware of the problem. If you only recently discovered the mis-selling, you may still be able to claim even for older mortgages.
What is statutory interest?
When the FOS or a court awards compensation for financial mis-selling, they typically add 8% simple interest per year on the amount overpaid, running from the date of each overpayment to the date of settlement.
Should I use a claims company?
No. You can complain directly to your lender for free, and escalate to the Financial Ombudsman Service (FOS) if unsatisfied. Claims companies charge 15-30% of your compensation.
What about mortgage broker commissions?
If your mortgage broker received undisclosed commissions that influenced their advice, this may constitute mis-selling. Recent court rulings have strengthened consumers' rights regarding undisclosed broker commissions.
Can I claim if I am still paying the mortgage?
Yes. You can claim while still on the mortgage. If successful, your lender may reduce your outstanding balance, change your product, or pay compensation.
Official Sources & References
Data verified against official UK government sources. Last checked April 2026.