When to Remortgage 2026: ERC Calculations, Best Rate Timing and Broker Tips

Remortgaging -- switching to a new mortgage deal before your current deal ends -- can save thousands of pounds if timed correctly. However, early repayment charges (ERCs) often block the path to savings. This guide shows you how to calculate whether remortgaging makes financial sense and when to lock in your new rate.

Understanding Early Repayment Charges (ERCs)

Most fixed-rate mortgages impose a penalty if you repay the loan before the deal ends. This is the early repayment charge.

Typical ERC structure:

• Year 1: 5% of outstanding balance
• Year 2: 4% of outstanding balance
• Year 3: 3% of outstanding balance
• Year 4: 2% of outstanding balance
• Year 5: 1% of outstanding balance
• Year 6+: 0%

However, ERCs vary widely by lender. Some charge a flat 2% regardless of year; others use tiered bands. Always check your mortgage offer or contact your lender for your exact ERC schedule.

Example: You have an outstanding mortgage of GBP 180,000. Your lender charges 3% ERC in year 3.

• ERC cost: GBP 180,000 × 0.03 = GBP 5,400

This GBP 5,400 cost must be justified by monthly savings from a better rate.

Calculating the Break-Even Point

Before remortgaging, determine how many months it takes monthly savings to offset the ERC cost.

Formula: Break-Even Months = ERC Cost / Monthly Saving

Worked Example:

Current situation:

• Outstanding mortgage: GBP 180,000
• Current rate: 5.2% fixed (2 years remaining)
• Monthly payment: GBP 979

New mortgage offer:

• Rate: 4.5% fixed (5 years)
• Monthly payment: GBP 854
• Monthly saving: GBP 125
• ERC cost: GBP 5,400 (3% in year 3)

Break-even calculation:

• Break-even months: GBP 5,400 / GBP 125 = 43.2 months (3.6 years)
• You recover the ERC after approximately 43 months

Decision: Your current deal ends in 24 months (2 years). After expiry, switching is penalty-free. However, you're considering switching now and paying the GBP 5,400 ERC. You would need to keep the new mortgage for at least 43 months to break even financially.

If you're unlikely to keep this property or mortgage for 3.6 years, don't remortgage. Wait until your current deal expires.

When to Lock in a Rate Early (6 Months Before End Date)

Most lenders allow rate-locking up to 6 months before your current deal ends. This strategy protects against rising rates without paying ERCs.

Scenario: Your 5-year fixed rate ends in 8 months. You lock in a new rate 6 months early.

Advantages:

• No ERC charged (you're locking in on time, not early repaying)
• You secure a rate before further increases
• New rate kicks in automatically when current deal ends
• Psychological comfort -- you know your payment in advance

Disadvantages:

• If rates fall significantly in the final 2 months, you're locked into a higher rate
• Lenders charge fees for early switching (typically GBP 0-500, or built into the rate)

Most financial advisers recommend locking in when rates appear elevated or volatile, or when your deal is within 6 months of expiry.

Using a Mortgage Broker vs Direct Application

DIY (Applying directly to your lender):

• Pros: You know your lender, quick process
• Cons: Limited to one lender's products; rarely best rates; inflexible negotiation

Mortgage broker:

• Pros: Access to 90%+ of the market; negotiates better rates; arranges the conveyancing; fee-free for most borrowers (lender pays commission)
• Cons: Slower process (typically 4-6 weeks vs 2 weeks direct); may recommend products earning them higher commission

Cost consideration: A good broker often saves GBP 5,000-10,000 over a 5-year term through better rates. Even a GBP 500-1,000 fee is recovered within months.

For amounts over GBP 100,000, using a broker typically outweighs DIY applications.

Porting Your Mortgage: Moving House Without Remortgaging

Porting allows you to move your mortgage to a new property without breaking your current deal or paying ERCs. This is invaluable if you're moving before your fixed deal ends.

Example: You have 2 years remaining on your 5-year fixed at 4.2%. You're selling your GBP 250,000 property and buying a new one for GBP 320,000.

Without porting:

• ERC charge: GBP 150,000 (outstanding) × 3% = GBP 4,500
• You'd switch to a new lender and new deal

With porting:

• Your existing rate (4.2%) ports to the new property
• You borrow an additional GBP 70,000 at your current 4.2% (not current market rate)
• No ERC charged
• You avoid the hassle of switching

Porting requirements:

• Lender must approve the new property (usually rubber-stamped)
• Loan-to-value ratio must remain acceptable (typically under 85%)
• No more than 90 days between selling and buying

If your new property is significantly more expensive, you'll need to borrow additional funds. The new amount splits: original loan ports at the old rate, additional borrowing is usually at a fresh rate (though sometimes negotiated at the same rate).

Tax Relief and Rate Comparisons

Since April 2020, non-landlord borrowers no longer receive tax relief on mortgage interest. For landlords, interest remains deductible, but mortgage capital repayment does not.

This changes the effective cost of remortgaging:

• Homeowner: Interest cost is real; compare net savings carefully
• Landlord: Interest is tax-deductible (at 20-40% depending on income); an ERC might pay for itself faster due to tax benefits

The Rate-Lock Decision Framework

Use this logic to decide whether to remortgage now:

Lock in now if:

• You're within 6 months of current deal end anyway
• New rate is at least 0.5% lower than current (GBP 1,250+ annual saving on GBP 250,000 mortgage)
• You plan to keep the property/mortgage 3+ years beyond lock-in
• Rates appear elevated; lender stress tests suggest future increases

Wait until deal expires if:

• You'll move house within 2 years (port instead)
• ERC exceeds 12+ months of monthly savings
• Rates are falling trend
• You're in an uncertain employment situation

Calculating Your Exact Monthly Saving

Online mortgage calculators provide approximate figures, but here's the precise method:

For a GBP 180,000 mortgage:

• Current: 5.2% over 23 years remaining = GBP 979/month
• New: 4.5% over 23 years = GBP 904/month
• Saving: GBP 75/month

Now factor the ERC:

• ERC: GBP 5,400
• Months to recover: GBP 5,400 / GBP 75 = 72 months (6 years)

If you're not staying 6+ years, waiting is financially superior.

Remortgage Rate Timing Strategy

Mortgage rates track the Bank of England base rate loosely. Understanding this helps time your switch:

Base rate rising: Wait until near the end of your current deal (or lock in if it's within 6 months). New rates will be higher, but at least you'll be forced to switch at that point anyway.

Base rate falling: Consider switching immediately if rates have fallen significantly (0.5%+). The cost of missing a further 0.25% fall is usually less than the ERC to switch now.

Base rate stable: Lock in when your deal is 6 months from expiry. You remove uncertainty and secure a rate before further movement.

For 2026, the base rate outlook is uncertain. Most commentators expect stability or modest rises, favouring patience unless you find a rate 0.5%+ lower than your current deal.

Hidden Costs in Remortgaging

Beyond the ERC, remortgaging incurs:

Direct costs:

• Broker fee: GBP 0-1,500 (usually zero as lender pays)
• Valuation: GBP 150-400 (sometimes waived)
• Legal/conveyancing: GBP 300-800 (rarely needed if same lender, sometimes waived)
• Product fee: GBP 0-2,000 (often offered free by lenders)

Opportunity cost:

• Time spent on applications and paperwork

Total direct cost is typically GBP 500-2,000. Add this to the ERC when calculating break-even.

Conclusion

Remortgaging makes sense only when monthly savings exceed ERC and other costs within your planned holding period. Most borrowers benefit from waiting until their current deal expires, or using the 6-month lock-in window to avoid ERCs entirely. If moving house before your deal ends, porting saves thousands in penalties.

Use our remortgage calculator or speak to a broker to model your specific scenario. Many GBP 5,000+ mistakes occur when borrowers remortgage unnecessarily due to ERC miscalculation or impatience.