Building Society Mortgage Early Repayment Charges Explained

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UK Mortgage Help • Independent 2026 Guide

Building Society Mortgage Early Repayment Charges Explained

An Early Repayment Charge (ERC) is a fee your building society may charge if you repay all or part of your mortgage, exceed an overpayment allowance or switch your mortgage deal during a restricted period.

If you are remortgaging, moving house, making a lump-sum overpayment or paying off your mortgage early, the first thing to check is the exact charge in your mortgage offer—not the headline percentage on a new deal.

Estimate My ERC Ways to Avoid a Charge Official Building Society Guidance
Important: Charges are product-specific, not universal across all building societies. The examples and calculator here are for planning only. Ask your own lender for the exact charge and, if repaying in full, a dated redemption statement before transferring money or completing a remortgage.

Editorial review: 14 October 2026. UK guidance based on MoneyHelper, the Financial Ombudsman Service and building society mortgage information.

Early Repayment Charges: Quick Answers

What is an ERC?A fee for repaying, overpaying or switching a mortgage within a period specified in your agreement.
Typical chargeMoneyHelper says ERCs are commonly around 1%–5% of the outstanding mortgage balance, although calculations differ.
When does it apply?Often during a fixed, capped or discounted rate period, but the charging period can sometimes extend beyond it.
Can you overpay?Many products allow limited penalty-free overpayments. Your own agreement decides the amount and reset rules.
Can it be waived?Sometimes, under specific product exceptions, bereavement arrangements, porting conditions or lender discretion.
Where is the exact amount?Your mortgage offer, product-switch documentation, lender account service or dated redemption statement.
Fast example: an ERC of 3% on £200,000 of mortgage borrowing would be £6,000 if the charge applies to that full balance. A £20,000 overpayment charged at 3% only on the portion above an available allowance could produce a very different result.

When Will a Building Society Charge an Early Repayment Fee?

A mortgage ERC is governed by your individual mortgage contract. It is not necessarily charged every time you make an additional payment or change products.

Your actionCould an ERC apply?What to check first
Pay off the entire mortgage during a dealYes, commonly.ERC end date, applicable percentage and redemption amount.
Remortgage to another lender before the deal endsYes, commonly.Completion date and the old lender’s ERC schedule.
Make an extra lump-sum paymentPossibly.Annual allowance, cumulative overpayments and the chargeable amount.
Change to a different product with the same building societyPossibly.Whether the existing deal is ended early and whether an ERC-free switch window applies.
Move house and port the existing mortgageDepends.Porting eligibility, timing, borrowing amount and any refund conditions.
Pay off a mortgage after the ERC period endsUsually no ERC.Check for mortgage exit, administration and other applicable charges.
Repay after a borrower’s deathException may apply.Lender bereavement provisions, borrower circumstances and loan terms.
Date trap: an ERC period can be different from the date your fixed interest rate ends. Check the exact contractual dates. Do not assume a charge automatically disappears on the date your next payment is collected.

Building Society Early Repayment Charge Calculator

Use this estimator to model either a full mortgage repayment or a lump-sum overpayment. For partial payments, enter any remaining penalty-free allowance available for the relevant period.

Estimate an ERC Before You Pay

Example figures are editable. The charge is calculated on the amount selected as chargeable, not automatically on your full property value.

Use your latest mortgage balance or lender quote.
Use the rate that applies on your intended payment date.
Optional separate charges; do not add an arrangement fee unless you are actually paying it.
Illustrative early repayment charge£6,000
Amount subject to ERC£200,000
Other entered exit costs£0
Estimated ERC plus other costs£6,000

The example assumes a flat 3% charge on the full £200,000 mortgage balance. It is not a redemption statement.

Calculator limitations: some mortgage products calculate ERCs differently, with stepped rates, different parts of the loan, minimum amounts, daily balances or lender-specific allowances. This tool assumes a straightforward percentage of the amount subject to the charge. The lender’s own calculation takes precedence.

Early Repayment Charge Examples: 1% to 5%

These examples assume the percentage is applied to the whole outstanding mortgage balance. They are not quotes from any particular building society.

Mortgage balance1% ERC2% ERC3% ERC5% ERC
£100,000£1,000£2,000£3,000£5,000
£150,000£1,500£3,000£4,500£7,500
£200,000£2,000£4,000£6,000£10,000
£250,000£2,500£5,000£7,500£12,500
£300,000£3,000£6,000£9,000£15,000

Why the Charge Can Reduce Over Time

Some fixed-rate mortgages have an ERC schedule that decreases as the deal progresses. For example, a particular illustrative deal might charge 5% in its first year, 4% in its second year and a lower percentage near the end.

However, this is not a standard schedule every building society follows. Some deals use different percentages, dates or calculation methods. Refer to the charge table in your mortgage offer and any later product-switch offer.

Mortgage Overpayments: When Does the ERC Start?

A regular or one-off mortgage overpayment reduces the amount you owe. Many building society mortgage products let you overpay within a defined allowance without an Early Repayment Charge, but there is no universal 10% rule applying to every account.

Allowance basisSome lenders use a percentage of the balance at a specific date. Others use a different contractual calculation.
Allowance periodThe reset could be linked to a calendar year, mortgage anniversary or another product-defined period.
Existing overpaymentsPrevious payments may have used some or all of your penalty-free allowance.
Different mortgage partsIf your loan contains multiple sub-accounts, each part may have separate limits and ERC rates.

Example: Overpaying Above a 10% Allowance

Suppose your mortgage balance is £200,000 and your product gives you an unused £20,000 penalty-free allowance for the current period. You want to overpay £30,000 and an ERC of 3% applies only to the excess.

Planned overpayment£30,000
Unused penalty-free allowance£20,000
Chargeable excess£10,000
Illustrative ERC at 3%£300
Check before transferring: some agreements treat full redemption differently from partial overpayments, and some calculate the charge on a larger amount than the simple excess used above. The £300 example only applies if your mortgage terms expressly support this method.

Can You Avoid Paying an Early Repayment Charge?

Sometimes. The realistic options depend on why you want to leave the deal, how soon it ends and whether the building society offers a relevant exception or alternative.

Wait until the charge endsArrange the mortgage completion or final repayment date after the exact ERC expiry date.
Use unused overpayment allowanceStay within the permitted allowance and check when it resets.
Book a future product transferAsk whether you can reserve a replacement rate now but start it after the existing ERC period.
Ask about portingIf moving home, ask whether the mortgage product can be transferred to the new property.
Check bereavement provisionsSome lenders waive an ERC when repayment follows the death of a borrower, subject to their rules.
Ask about hardship or exceptional circumstancesThe lender may consider your situation, but there is no general right to have a valid charge waived.
Useful practical step: request two personalised figures from your building society—one for redeeming on your intended date and one for redeeming immediately after the ERC period ends. Compare both against the costs of keeping your present deal.

Is Paying an ERC Worth It to Get a Lower Mortgage Rate?

Paying an ERC can occasionally make financial sense, especially on a large mortgage where a meaningful interest-rate reduction could offset the one-off charge. But a lower advertised rate does not prove that switching early will save money.

Compare the entire cost over the same period, including the old and new interest rates, fees, ERC, repayment method and what happens when the introductory rate ends.

Stay With Your Current Deal

  • Existing monthly repayment.
  • Interest due until the present deal ends.
  • Any available penalty-free overpayment options.
  • Next rate after the current deal expires.
  • Future product-switch costs.

Switch Before the Deal Ends

  • ERC payable to the current lender.
  • New mortgage product fee.
  • Legal, valuation or administration charges.
  • New monthly payments and interest.
  • New fixed-rate period and future ERC commitment.

Simple Break-Even Example

Imagine the ERC is £3,000, additional switching costs are £500, and your new mortgage would reduce the monthly payment by £150.

Simple payback estimate: (£3,000 + £500) ÷ £150 = approximately 23.3 months.

This is a quick cash-flow illustration, not proof of a saving. A lower payment may partly reflect slower capital repayment or a longer mortgage term. For a sound comparison, check remaining mortgage balances and total interest over matching periods, not only monthly payment differences.

Important: if your existing ERC ends in only three months, paying £3,500 to save £150 a month during those three months would generally be difficult to justify from that short-term saving alone. Timing can matter more than the headline rate.

Moving House: Can You Port a Building Society Mortgage Without an ERC?

Porting means applying to transfer an existing mortgage product to a new property, rather than simply moving the original loan automatically. It can help preserve an existing rate and may prevent or reduce an ERC when the lender’s conditions are met.

Porting is still subject to the building society’s lending criteria, property assessment and application process. Additional borrowing can have a different interest rate and separate conditions.

Same borrowing amountAsk whether the whole existing product can transfer to the new home.
Smaller new mortgageReducing the loan could trigger a partial ERC depending on the product.
More borrowingThe additional mortgage portion may need a separate product and affordability assessment.
Different completion datesCheck whether you must redeem first and later receive a refund if the port completes within the permitted window.
Do not assume porting is guaranteed: the Financial Ombudsman Service considers circumstances where a lender declines a porting request and the borrower subsequently faces an ERC. A dispute depends on the facts and relevant lending requirements.

Official Building Society ERC Rules: Where to Check

The charge on your mortgage depends on the product you actually hold. Even two borrowers with the same building society may have different ERC end dates, overpayment allowances and mortgage parts.

Yorkshire Building SocietyYBS Early Repayment Charge Guidance

Yorkshire Building Society explains when an ERC can apply, how to check your individual mortgage and why separate loan parts may have different charges.

After opening this link:
  1. Read the situations that can trigger an ERC.
  2. Find the explanation of charge-free circumstances and overpayments.
  3. Check your mortgage offer for your own percentage and expiry date.
  4. If the mortgage contains several parts, check the terms of each part.
  5. Ask YBS for a personalised figure before repayment or switching.

MoneyHelperMoneyHelper: Switching Early and Mortgage Charges

MoneyHelper explains how paying an ERC to switch mortgage deals can sometimes be worth considering, while also highlighting the potential cost.

After opening this link:
  1. Find the guidance on being stuck on an uncompetitive mortgage rate.
  2. Read the section covering paying to switch your mortgage early.
  3. Review the typical ERC range and how charges can affect the decision.
  4. Consider the separate guidance on mortgage overpayments.
  5. Compare the total cost of staying against moving to another deal.

Financial Ombudsman ServiceMortgage ERC Complaint Guidance

The Financial Ombudsman Service explains the types of ERC disputes it can consider and what evidence is relevant.

After opening this link:
  1. Read the explanation of Early Repayment Charges.
  2. Check whether your situation matches one of the complaint categories.
  3. Review the information about mortgage terms and lender disclosure.
  4. Make a complaint to your building society first.
  5. If the response does not resolve the problem, check the Ombudsman’s referral rules and time limits.
Always use your own building society’s official mortgage management or contact route. A general published tariff may explain account fees without stating the ERC that applies to your particular mortgage offer.

How to Get an Exact Mortgage Redemption Statement

A redemption statement shows what the lender requires to repay the mortgage on a specified date. It can include the outstanding capital, accrued interest, ERC and any other applicable fees.

Mortgage account referenceHave your account number ready when contacting the lender through an official channel.
Intended repayment dateChoose a realistic date because interest and charges may change if completion is delayed.
Mortgage sub-accountsCheck whether several parts of the mortgage have different rates or ERC schedules.
Source of repayment fundsYour building society or conveyancer may require information about where the repayment money is coming from.

Questions to Ask Your Building Society

  1. Does my mortgage currently have an Early Repayment Charge?
  2. What is the exact ERC if I redeem on my planned date?
  3. What date does the charge end, and is there a penalty-free switch window?
  4. How much unused overpayment allowance remains?
  5. Do different sub-accounts have separate charges?
  6. Are there exit fees, administration charges or daily interest adjustments?
  7. If I am moving house, can I port the product or qualify for a refund?
  8. How long is the redemption statement valid, and how do I obtain an updated one?
Before sending money: confirm the settlement instructions directly through your building society or authorised conveyancer. Be particularly careful if payment details arrive in an unexpected email or change shortly before completion.

Can You Challenge an Unfair Early Repayment Charge?

Yes. You can complain if you believe the ERC was calculated incorrectly, inadequately disclosed or applied unfairly. That does not mean every charge is unlawful or will be refunded.

The Financial Ombudsman Service considers the mortgage terms, relevant regulatory requirements, what the lender explained, the circumstances of repayment and how the charge was calculated.

Useful Complaint Evidence

  • Original mortgage offer.
  • Latest product-switch offer, if relevant.
  • ERC schedule and product conditions.
  • Redemption statement.
  • Mortgage statements and payment records.
  • Relevant correspondence with the lender.
  • Notes from calls about repayment or porting.

Possible Reasons for a Dispute

  • Incorrect percentage or balance used.
  • Charge applied outside the agreed period.
  • Misleading or missing information before the mortgage was agreed.
  • Incorrect treatment of a permitted overpayment.
  • Problems connected with a declined porting request.
  • Failure to consider relevant financial difficulty or exceptional circumstances fairly.
Complaint timescale: the lender normally has up to eight weeks to provide a final response for most mortgage complaints. If you remain dissatisfied, you can generally refer the complaint to the Financial Ombudsman Service, usually within six months of the final response. Specific jurisdiction and time-limit rules apply.

Official complaint routeFinancial Ombudsman Service: Early Repayment Charges

After opening this link:
  1. Read the examples of ERC complaints the service considers.
  2. Check what the service looks at when deciding whether a charge was fair.
  3. Contact the lender using its formal complaint procedure first.
  4. Keep the final response letter and the supporting mortgage documents.
  5. Use the Ombudsman’s complaint instructions within the relevant referral deadline.

Common ERC Mistakes to Avoid

Assuming every mortgage permits 10% overpaymentsCheck the exact limit, definition and allowance period in your own offer.
Repaying a few days too earlyConfirm the lender’s exact date and the date your redemption payment will be received.
Ignoring separate mortgage partsA mortgage with multiple products may have different rates, allowances and ERC dates.
Comparing only monthly paymentsA lower payment may reflect a longer mortgage term rather than a genuine reduction in total cost.
Assuming porting is automaticA lender normally needs to approve the new property and the proposed borrowing arrangements.
Using an old redemption figureInterest and amounts due can change. Obtain an updated statement for the actual completion date.

Related Building Society Mortgage Guides

These existing Building-Society.org articles provide further information about mortgage rates, remortgaging, product switching and lender-specific conditions.

Nationwide Building Society Mortgage Rates and Remortgaging Yorkshire Building Society Mortgage Rates and ERCs Coventry Building Society Mortgage Rates and Overpayments Norwich & Peterborough Existing Mortgage Customer Guide Family Building Society Mortgage Options

Building Society Mortgage Early Repayment Charge FAQs

1. What is an Early Repayment Charge on a building society mortgage?

An Early Repayment Charge is a fee a lender may apply if you repay your mortgage, overpay beyond a permitted allowance or switch products during a restricted period stated in your mortgage agreement.

2. How much is a typical mortgage Early Repayment Charge?

MoneyHelper says ERCs are commonly around 1% to 5% of the outstanding mortgage balance, although some products use different calculations. Your own mortgage offer determines the applicable charge.

3. How much is a 3% ERC on a £200,000 mortgage?

A straightforward 3% charge on £200,000 is £6,000. This assumes the entire balance is subject to the charge and does not account for additional fees or product-specific exceptions.

4. Can I make mortgage overpayments without an ERC?

Many mortgage products permit overpayments within a specified allowance without an ERC. The allowance, reset date and way excess payments are charged depend on your mortgage terms.

5. Does an ERC always end when a fixed-rate mortgage finishes?

No. The charging period and fixed-rate period are often linked but are not necessarily identical. Check the exact ERC expiry date shown in your mortgage offer or product-switch agreement.

6. Can I remortgage before my fixed-rate deal ends?

Yes, but an Early Repayment Charge and other switching costs may apply. Compare the cost of redeeming early with the potential savings from a new deal and the option of waiting until the ERC period ends.

7. Do I pay an ERC if I move house and port my mortgage?

Not necessarily. Some building societies permit a qualifying mortgage product to be ported to a new property, possibly avoiding or refunding an ERC. Approval, timing and borrowing conditions vary.

8. Can a building society waive an Early Repayment Charge?

Sometimes. A lender may offer specific exceptions or consider individual circumstances. An automatic waiver should never be assumed unless it is confirmed in the mortgage terms or directly by the lender.

9. Where can I find the exact ERC on my mortgage?

Check the original mortgage offer, any later product-switch offer, the relevant mortgage account service or a personalised redemption statement from your building society.

10. Can I complain if my building society charged an unfair ERC?

Yes. Complain to the lender first and provide your mortgage offer, charge information and relevant correspondence. If the complaint remains unresolved, the Financial Ombudsman Service may be able to consider it subject to its rules and time limits.

Official Sources and Editorial Accuracy

This article explains general UK mortgage ERC principles. It does not assign one building society’s current charges to all lenders or claim that a particular overpayment allowance is universal.

MoneyHelper: Mortgage Switching and ERCs MoneyHelper: Remortgaging Costs Yorkshire Building Society: ERC Guidance Financial Ombudsman: Consumer ERC Guidance Financial Ombudsman: ERC Rules and Disputes
Independent financial information notice: Building-society.org is not a building society, mortgage lender, mortgage broker, regulator or financial adviser. This content and calculator do not provide personalised mortgage advice, a binding redemption quote or a promise that an ERC can be avoided. Your mortgaged property may be repossessed if you do not keep up repayments.

Last editorial review: 14 October 2026. Verify mortgage-specific charges, conditions and redemption amounts directly with your lender before acting.

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