Fixed-Rate Mortgages Explained: How They Work and How to Choose the Right Term

This guide explains how fixed-rate mortgages work, what determines the rate you are offered, and how to decide which fixed-rate term suits your circumstances. Whether you are buying your first home, remortgaging at the end of a deal or moving to a new property, understanding fixed-rate products will help you make an informed decision about one of the largest financial commitments you are likely to take on.

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For a free initial consultation about fixed-rate mortgage options, call 01202 155992 or contact Mortgage One.

How Fixed-Rate Mortgages Work

A fixed-rate mortgage locks in your interest rate for an agreed period, typically two, three, five or ten years. During this time, your monthly repayments remain the same regardless of what happens to the Bank of England base rate or wider interest rates. This makes it easier to budget because you know exactly what you will pay each month for the duration of the fixed term.

The rate you are offered on a fixed-rate mortgage is not set directly by the Bank of England base rate. Instead, lenders price fixed-rate deals primarily using swap rates, which reflect the market’s expectation of where interest rates will be over a given period. A two-year fixed rate is influenced by two-year swap rates, while a five-year fixed rate follows five-year swaps. When swap rates rise, fixed-rate mortgage pricing tends to increase, and when they fall, lenders can offer more competitive deals. Other factors that affect the rate include your loan-to-value ratio, credit profile, income type and the lender’s own funding costs and commercial appetite.

The Bank of England base rate stood at 3.75 per cent following the Monetary Policy Committee’s decision on 19 March 2026, having been held at that level since December 2025. The next MPC decision is due on 30 April 2026.

In early April 2026, the average two-year fixed rate across all loan-to-value bands was approximately 5.9 per cent and the average five-year fixed rate was approximately 5.78 per cent, according to Moneyfacts. Rates had risen sharply from early March levels following increases in swap rates linked to geopolitical developments and higher energy prices. However, there are signs that the pace of increases may be stabilising.

Mortgage One’s rate forecast page covers the latest Bank of England base rate outlook and what it could mean for mortgage pricing.

Fixed-Rate Terms Compared

The length of your fixed-rate term affects both the rate you pay and the flexibility you have. Here is how the most common terms compare.

Two-year fixed. Typically the shortest standard fixed term. Two-year deals may carry lower initial rates in a falling rate environment because the lender’s funding cost is based on a shorter swap period. However, you will need to remortgage sooner, which means paying arrangement fees more frequently and being exposed to whatever rates are available when the deal ends.

Three-year fixed. A middle ground that some lenders offer. Three-year fixes can suit borrowers who want slightly longer certainty than a two-year deal without committing to five years. Availability varies by lender.

Five-year fixed. The most popular fixed-rate term in the UK. A five-year fix offers a longer period of payment certainty and means you avoid arrangement fees and the remortgage process for a longer stretch. In stable or rising rate environments, locking in for five years can provide useful protection.

Seven and ten-year fixed. Longer-term fixes provide extended certainty but are less widely available. Rates on longer fixes are not always higher than shorter-term deals; in some market conditions, the yield curve can be flat or inverted. Early repayment charges on longer fixes apply for a longer period, which reduces flexibility if your circumstances change.

The right term depends on your plans, your appetite for rate risk and how long you expect to stay in the property. A mortgage broker can model different scenarios to show how each term length would affect your total costs. Mortgage One’s guide to getting a competitive mortgage rate explains the factors that influence what rate you can access.

What Happens When Your Fixed Rate Ends

When your fixed-rate period expires, your mortgage does not simply continue at the same rate. Your lender will move you onto their standard variable rate, which is a rate set by the lender that can change at any time. Standard variable rates are typically significantly higher than fixed-rate deals.

The average standard variable rate across UK lenders was approximately 7.15 per cent in April 2026, compared with average fixed rates in the high fives. Remaining on an SVR for even a few months can add hundreds of pounds to your annual mortgage costs.

To avoid paying the SVR, most borrowers remortgage to a new deal before their current fixed rate expires. Many lenders allow you to secure a new product up to six months before your existing deal ends, locking in a rate without any obligation to proceed if something more competitive becomes available closer to the time. Mortgage One’s remortgaging guide explains the process and timing in detail.

If you are currently on a standard variable rate and unsure whether to fix, Mortgage One’s standard variable rate mortgage guide explains how SVRs work and when switching may be worthwhile.

To discuss your fixed-rate options or find out what rates may be available for your circumstances, call 01202 155992 or contact Mortgage One.

Early Repayment Charges and Overpayments

Fixed-rate mortgages come with early repayment charges that apply if you repay the mortgage in full, switch to a different product or move to another lender during the fixed-rate period. ERCs are usually expressed as a percentage of the outstanding balance and can range from around 1 per cent to 5 per cent depending on the lender and how far through the fixed term you are. On a mortgage of £250,000, a 3 per cent ERC would amount to £7,500, so this is an important consideration if you think your circumstances may change.

Most lenders allow overpayments of up to 10 per cent of the outstanding mortgage balance per year without triggering an ERC. This means you can reduce your balance faster and save on interest without penalty, provided you stay within the allowance. Some lenders offer higher overpayment limits or no ERCs at all on certain products, so it is worth checking the specific terms of any deal you are considering.

If flexibility to make large overpayments or repay early without penalty is important to you, a tracker mortgage may be worth considering as an alternative. Mortgage One’s tracker mortgage guide explains how tracker deals work and when they may suit.

Who Fixed-Rate Mortgages Suit

Fixed-rate mortgages are the most popular product type in the UK for good reason. They suit borrowers who want certainty over their monthly outgoings and prefer not to take on the risk of rate movements during the fixed period. They are particularly relevant for:

•       First-time buyers managing a new set of housing costs alongside a deposit, stamp duty and moving expenses. Mortgage One’s first-time buyer mortgage guide covers the full process from application to completion.

•       Families with fixed household budgets who need to know their mortgage payment will not change unexpectedly.

•       Borrowers remortgaging from an SVR or an expiring deal who want to lock in a known rate before potential further market movement.

•       Anyone who prefers predictability over the possibility of short-term savings from a variable rate.

Fixed rates are not always the right choice for every borrower. If you expect to move home or make significant changes to your mortgage within a short period, the early repayment charges on a fixed-rate deal could outweigh the benefit of rate certainty. Mortgage One’s mortgage affordability guide can help you understand how different rate types affect what you can borrow and what you will pay.

Fixed Rates Versus Variable Alternatives

The main alternative to a fixed-rate mortgage is a variable-rate product. Variable rates come in several forms, each with different characteristics.

Tracker mortgages follow the Bank of England base rate by a set margin. If the base rate falls, your payments decrease; if it rises, your payments increase. Trackers offer transparency because the rate moves in line with an external benchmark rather than at the lender’s discretion.

Discount mortgages offer a reduction on the lender’s standard variable rate for an initial period. Unlike trackers, the underlying SVR can change at the lender’s discretion, so the discount does not guarantee a specific relationship to the base rate. Mortgage One’s discount mortgage guide explains how these products work.

In an environment where rates are expected to remain stable or rise, fixing provides protection against higher costs. In a falling rate environment, variable products may offer lower payments, but with the trade-off of uncertainty. Neither approach is inherently better; the right choice depends on your financial position, risk tolerance and how long you plan to keep the mortgage.

How Mortgage One Can Help

Choosing between fixed-rate terms and comparing products across different lenders takes time and market knowledge. As a whole of market mortgage broker, Mortgage One has access to deals from across the lending market, including products that may not be available directly to borrowers.

Mortgage One can assess your income, deposit, credit profile and plans to identify which fixed-rate products may be suitable for your circumstances. This includes modelling different term lengths to show how each option would affect your monthly payments and total cost over the deal period.

Figures as of April 2026, London time.

For expert guidance on fixed-rate mortgages tailored to your situation, call 01202 155992 or contact Mortgage One.

The information provided in this article is for general guidance only and does not constitute personal or regulated financial advice. If you’d like to understand what these moves could mean for you, speak to Mortgage One. We can explain your options and timings based on your specific circumstances.

Some Buy to Let mortgages are not regulated by the Financial Conduct Authority.

FAQs

1. What is a fixed-rate mortgage?

A fixed-rate mortgage locks in your interest rate for an agreed period, typically between two and ten years. Your monthly repayments stay the same throughout the fixed term, regardless of changes to the Bank of England base rate or wider interest rates.

2. How are fixed-rate mortgage rates set?

Lenders price fixed-rate mortgages primarily using swap rates, which reflect the market’s expectation of where interest rates will be over the relevant period. Your individual rate also depends on your loan-to-value ratio, credit profile, income type and the lender’s own criteria.

3. Should I choose a two-year or five-year fixed rate?

A two-year fix gives you flexibility to remortgage sooner but means paying arrangement fees more frequently. A five-year fix offers longer payment certainty and avoids the remortgage process for a longer period. The right choice depends on your plans, your view on future rate movements and how much you value payment stability.

4. What happens when my fixed-rate deal ends?

Your mortgage will revert to your lender’s standard variable rate, which is usually significantly higher than fixed-rate deals. Most borrowers remortgage to a new product before the fixed term expires to avoid paying the SVR.

5. Can I overpay on a fixed-rate mortgage?

Most lenders allow overpayments of up to 10 per cent of the outstanding balance per year without charging an early repayment charge. Any overpayment above that limit will typically trigger an ERC. Check the specific terms of your deal before making additional payments.

6. What are early repayment charges?

Early repayment charges are fees that apply if you repay your mortgage in full, switch products or move to another lender during the fixed-rate period. They are usually calculated as a percentage of the outstanding balance and can be significant, so it is important to factor them into any decision to exit a fixed deal early.

7. Are fixed rates always higher than variable rates?

Not necessarily. In some market conditions, fixed rates can be lower than the lender’s standard variable rate or even lower than tracker rates. The relationship between fixed and variable rates depends on swap rates, the base rate and lender pricing strategies at the time.

8. How far in advance can I lock in a fixed rate?

Many lenders allow you to secure a fixed-rate product up to six months before your current deal expires or before completion on a purchase. This lets you lock in a rate with the option to switch if something more competitive becomes available closer to the time.