Key Takeaway

Early repayment charges (ERCs) penalise UK borrowers who repay all or part of their mortgage during the initial deal period, typically on fixed-rate, tracker, or discount mortgages. Lenders calculate ERCs as a percentage of the amount overpaid or redeemed early, with the rate declining each year of the deal. ERCs can run into thousands of pounds, making it essential to check your mortgage terms before remortgaging, selling, or making large overpayments.

What Is an Early Repayment Charge?

An early repayment charge is a fee lenders impose when you repay your mortgage faster than the agreed schedule during the deal period. The deal period is the initial fixed, tracker, or discounted term during which your lender offers a specific interest rate. Once this period ends and you revert to the lender’s standard variable rate (SVR), ERCs typically no longer apply.

Lenders use ERCs to protect themselves from losses when borrowers exit the deal early. As covered in foundational finance texts such as Principles of Finance, lenders hedge against interest rate movements when they set fixed rates, and early redemptions disrupt that hedging. The charge compensates the lender for administrative costs and the lost interest income over the remaining deal period.

When Do Early Repayment Charges Apply?

ERCs apply during the deal period on most fixed-rate, tracker, and discount mortgages. They do not normally apply to:

  • Standard variable rate mortgages (SVR), as these have no deal period
  • Repayments made after the deal period ends
  • Regular monthly payments within the agreed schedule
  • Permitted overpayments (usually up to 10 per cent of the outstanding balance per year without penalty)

Common situations that trigger an ERC include:

  • Remortgaging to a new lender or switching products before the deal expires
  • Selling your property and repaying the mortgage in full
  • Making lump-sum overpayments that exceed the penalty-free allowance
  • Porting your mortgage to a new property but repaying part of the balance

According to MoneyHelper, borrowers should check their mortgage illustration or offer letter to confirm the ERC terms, as they vary by lender and product.

How Lenders Calculate Early Repayment Charges

Most UK lenders calculate ERCs as a percentage of the outstanding mortgage balance (or the amount overpaid). The percentage usually decreases each year of the deal. A typical structure for a five-year fixed-rate mortgage might be:

  • Year 1: 5 per cent of the balance
  • Year 2: 4 per cent
  • Year 3: 3 per cent
  • Year 4: 2 per cent
  • Year 5: 1 per cent
  • After year 5 (on SVR): no ERC

For example, if you have a mortgage balance of £200,000 and decide to remortgage in year three of a five-year fix with a 3 per cent ERC, the charge would be £200,000 x 3 per cent, which equals £6,000. If you only overpay £50,000 beyond the penalty-free allowance, the ERC applies to that overpayment: £50,000 x 3 per cent, which equals £1,500.

Some lenders calculate the ERC differently. A few base the charge on the initial loan amount rather than the current outstanding balance, which can result in a higher penalty if you have already paid down part of the mortgage. Others cap the ERC at a fixed cash sum or apply a flat fee instead of a percentage. Always read your mortgage conditions document to understand the calculation method for your specific product.

Overpayment Allowances

Most UK mortgages allow you to overpay up to 10 per cent of the outstanding balance per year without incurring an ERC (as of August 2026, rates and terms change frequently, verify current terms with an FCA-authorised lender or adviser before deciding). The 10 per cent limit usually resets each mortgage year (the anniversary of your completion date, not the calendar year).

Read also: UK Remortgage Guide: When to Switch Deals and How to Get the Best Rate

If you overpay £5,000 when your outstanding balance is £150,000, and the 10 per cent allowance is £15,000, no ERC applies. If you overpay £20,000, the excess £5,000 may attract the ERC. Some lenders allow unused overpayment allowances to roll over into the next year, while others do not.

Offset mortgages, which link your savings to your mortgage balance, typically offer more flexibility and may permit unlimited overpayments without penalty during the deal period.

Comparing ERC Costs Against Remortgage Savings

Before remortgaging during the deal period, calculate whether the savings from a lower interest rate outweigh the ERC and other switching costs (arrangement fees, valuation, legal fees). For instance, if switching from a 4.5 per cent fixed rate to a 3.5 per cent tracker saves you £150 per month but the ERC is £4,000, it will take approximately 27 months to break even.

Use a remortgage break-even calculator to model the total cost. If you plan to stay in the property beyond the break-even point, switching may be worthwhile. If you expect to move or refinance again soon, paying the ERC may cost more than it saves. MoneySavingExpert provides tools and guidance for comparing remortgage scenarios.

Porting Your Mortgage and Partial Redemptions

Porting allows you to transfer your existing mortgage to a new property, preserving your current deal and avoiding the ERC. However, if the new property costs less than your current mortgage balance, you must repay the difference, which may trigger an ERC on the redeemed amount. Similarly, if you need a larger mortgage, you will take out an additional loan at the new prevailing rate, creating a blended rate structure.

Not all mortgages are portable, and lenders reassess your affordability when you port. If your circumstances have changed (lower income, higher debts), the lender may decline the port, forcing you to remortgage elsewhere and pay the ERC.

Regulatory Protections and Disclosure

The Financial Conduct Authority (FCA) requires lenders to disclose ERC terms clearly in the mortgage illustration (the pre-application summary) and the offer document. Lenders must also remind you of the ERC before the deal period ends, giving you time to decide whether to remortgage, switch products with the same lender (a product transfer, which often avoids ERCs), or revert to the SVR.

If a lender fails to disclose the ERC properly or applies a charge incorrectly, you can complain to the lender and, if unresolved, escalate to the Financial Ombudsman Service. The FCA sets conduct standards for mortgage firms to ensure fair treatment and transparency.

Conclusion

Early repayment charges protect lenders but can be expensive for borrowers who need to remortgage, move home, or repay their mortgage during the deal period. Understanding how your lender calculates the ERC, the overpayment allowances, and the break-even point for switching deals enables you to make informed decisions. Always verify your mortgage terms and current ERC before committing to a remortgage or large overpayment, and consider speaking to an FCA-authorised mortgage adviser for personalised guidance.

Your home may be repossessed if you do not keep up repayments on your mortgage.

Financial Disclaimer: This article provides general educational information about early repayment charges on UK mortgages. It is not regulated mortgage advice, nor personalised financial, lending, or legal advice. Refisage is not authorised by the Financial Conduct Authority (FCA). Early repayment charge structures, overpayment allowances, and eligibility vary by lender, product, and your personal circumstances. Rates and terms change frequently. Before making decisions about remortgaging, overpaying, or porting your mortgage, verify current terms with an FCA-authorised mortgage adviser or lender for advice specific to your situation.