Remortgage Savings: Common Mistakes, Tips and FAQs

Updated 14 July 2026 · Property and mortgages

Introduction

Property numbers are large, so small misunderstandings turn into expensive mistakes. The rules also differ across England, Scotland, Wales and Northern Ireland, which catches out many buyers.

This article covers the most common mistakes people make with remortgage Savings, what really moves the result, and answers to the questions we hear most often.

Why it matters

A few percentage points on LTV, rate or tax can change what you pay by thousands of pounds. Running the numbers early helps you set a realistic budget and compare deals properly.

How it's calculated

We calculate the monthly payment on your remaining balance at both rates. The break-even point is the fees divided by the monthly saving.

What changes the result most

We raised each input by 10% on its own, starting from a typical example where monthly saving is £167.56. Here's what happened:

Raising current rate from 6 % to 6.6 % changes monthly saving to £237.65 (+41.8%).
Raising new rate from 4.5 % to 4.95 % changes monthly saving to £118.47 (-29.3%).
Raising remaining balance from £200,000 to £220,000 changes monthly saving to £184.32 (+10.0%).
Raising remaining term (years) from 20 to 22 changes monthly saving to £171.38 (+2.3%).

The result is especially sensitive to current rate – a 10% change there moves it by more than 10%, so get that figure right first.

Common mistakes to avoid

Forgetting to budget for stamp duty, legal fees and surveys on top of the deposit.
Comparing mortgage deals on rate alone and ignoring arrangement fees.
Assuming first-time buyer relief applies above the price limit.
Calculating rental yield on rent alone without deducting running costs.

A quick example

With the inputs below, monthly saving comes out at £167.56.

Input	Value
Remaining balance	£200,000
Current rate	6 %
New rate	4.5 %
Remaining term (years)	20
Fees for new deal	£999

Tips

Stamp duty rules differ by nation: SDLT in England and Northern Ireland, LBTT in Scotland and LTT in Wales.
Lenders price mortgages in LTV bands, so a slightly bigger deposit can unlock a noticeably lower rate.
Always compare the total cost of a mortgage deal including fees, not just the headline rate.
Most lenders let you overpay up to 10% of the balance each year without early repayment charges.

Frequently asked questions

What's the quickest way to work out remortgage Savings?

Use our free remortgage Calculator. It applies this method automatically: We calculate the monthly payment on your remaining balance at both rates. The break-even point is the fees divided by the monthly saving.

Do these calculators cover Scotland and Wales?

Yes. We have separate calculators for LBTT in Scotland and Land Transaction Tax in Wales, as well as SDLT for England and Northern Ireland.

Are the mortgage figures a mortgage offer?

No. They are estimates. A lender's decision depends on your credit history, outgoings and their own affordability checks.

How accurate is the monthly repayment?

It uses the standard repayment formula and matches lender illustrations closely for a fixed rate, but actual payments can vary if your rate changes.

Related calculators

Try the remortgage Calculator

Enter your own figures and get an instant answer – free, no sign-up.

Open the remortgage Calculator

For the full method, read How to Calculate Remortgage Savings in the UK: Step-by-Step Guide.

More property and mortgages guides

This guide is general information, not financial, tax, legal or medical advice. Figures use 2025/26 UK rates where relevant. Always check GOV.UK or NHS.uk for official guidance.