Overview
The date your fixed mortgage rate ends is a planning deadline. Waiting until that month to compare options can leave little time for underwriting, documents and legal work.
Starting early does not mean paying off your current mortgage early. The application, offer and completion can happen at different times, allowing you to prepare a replacement while checking when it is economical to switch.
Quick Answer (Read This First)
Begin reviewing your options around six months before the current deal ends. Check your lender's switching window, any early repayment charge and the validity of a proposed new offer. MoneyHelper recommends setting a reminder at least six months before a fixed or discounted deal reverts. MoneyHelper: remortgaging.
Six months is a useful starting point, not a universal guarantee that every lender will reserve every deal for that long.
Find the Dates That Control the Switch
Read your current mortgage offer or ask the lender to confirm the product end date, early repayment charge end date and rate that follows. Also check whether different parts of the mortgage have different deals.
Write the dates down separately. A mortgage term ending in twenty years and an introductory rate ending this December are different events. The replacement needs to be coordinated with the product and charge dates, not the final lifetime repayment date.
For example, if a charge applies through 31 December, do not assume a replacement completing on 30 December is close enough. Ask for the amount payable on the intended completion date and let the conveyancer coordinate redemption.
Compare a Product Transfer With a New Lender
A product transfer changes the deal with your existing lender. A remortgage to a different lender involves a new mortgage and usually additional assessment and legal work.
Existing-customer switches can be simpler, but their requirements depend on the lender and what you want to change. The Co-operative Bank, for example, says a straightforward product-only switch normally needs no credit search or new valuation. That should not be extended to additional borrowing or every other lender. Co-operative Bank: switching an existing deal.
Obtain both sets of terms where available. Compare fees, payments, balance remaining at the end of the deal and restrictions, using the same intended repayment term. Our mortgage comparison guide explains the cost calculation.
Use the Lead Time for Evidence
An early review gives you time to obtain documents and resolve discrepancies before an application becomes urgent. Check income evidence, credit reports, mortgage statements and information about the property.
If you are self-employed, identify which accounts and tax documents the proposed lender requires. Do not assume the lender will accept figures that have not yet been finalised. See self-employed mortgage evidence.
Also review your borrowing needs. Adding money for home improvements or consolidating debts changes the application and cost. Comparing a larger new mortgage with a smaller existing balance can make a simple rate comparison misleading.
A Practical Planning Schedule
This is an illustrative workflow rather than a promise about processing times.
| Time before the deal ends | Useful action |
|---|---|
| Around six months | Confirm dates, review affordability and ask when new deals can be reserved |
| Following weeks | Compare existing-lender and external options; gather evidence |
| Once a suitable option is identified | Check offer validity, fees and the intended start or completion date |
| Before completion | Confirm legal progress, redemption charges and any changes to circumstances |
| After switching | Check the closing statement and first payment under the new arrangement |
MoneyHelper explains that applications can usually be made up to six months ahead, while actual availability and terms need checking with the provider. MoneyHelper: changing mortgage provider.
If Rates Change After You Reserve
Ask the lender or broker whether you can move to another available product before completion, what notice is needed and whether fees or a fresh assessment apply. Keep the existing offer in place until you understand the replacement process.
There is no need to predict the exact direction of rates to organise your paperwork. The useful comparison is between the concrete options available to you, including the consequences if you wait and no replacement is ready.
If circumstances change, such as a job move or new borrowing, disclose that as required. A reservation or offer does not make the information in the application irrelevant afterwards.
If Time Is Already Short
Contact your existing lender promptly about available switches and ask a broker or proposed new lender about realistic completion timing. Check the reversion rate and likely payment if there is a gap.
Compare the cost of a short period on that rate with any charge for switching early. Do not pay a substantial early repayment charge merely to avoid a few days of higher interest without doing the arithmetic.
If the new payment is unaffordable, discuss support before missing it. MoneyHelper describes lender support and switching options for borrowers facing rising payments. MoneyHelper: mortgage payment concerns.
Frequently Asked Questions
Read about remortgage declines or browse mortgage guides. This is general information; sources were checked on 9 September 2026.
