Fixed or Tracker mortgage: how to choose

Tracker-rate and fixed-rate mortgages are two common ways to structure your borrowing. Both can be suitable, but they behave differently when interest rates change—so the “best” choice depends on what you want your repayments to do over time.

This guide explains the key differences, the main advantages and drawbacks, and the questions worth asking before you decide.

This guide is written for home buyers. If you're remortgaging an existing home, read our remortgage rate choices guide.

You may also find these guides useful:

• Fixed or variable mortgage guide — comparing fixed against the whole variable-rate family, including SVR and discounted deals.
• How interest rates affect your mortgage — a broader look at how interest rates affect your mortgage, including affordability and borrowing power.

What is a tracker-rate mortgage?

A tracker-rate mortgage is designed to move in line with a reference rate—typically the Bank of England (BoE) base rate.

How repayments can change

• If the BoE base rate falls, your mortgage rate may fall too, reducing your monthly payments.
• If the BoE base rate rises, your mortgage rate may rise, increasing your monthly payments.

Types of trackers You may see tracker deals offered as:

• Introductory trackers: the tracker rate applies for a set period, then you move to another rate.
• Lifetime trackers: the tracker feature applies for the entire mortgage term.

Why people choose trackers Tracker mortgages can be attractive if you want the possibility of lower payments when interest rates fall.

Main risk with trackers The trade-off is repayment uncertainty. If interest rates rise after you take the mortgage, your repayments can increase—sometimes at a time when your budget is already under pressure.

What is a fixed-rate mortgage?

A fixed-rate mortgage keeps the interest rate the same for a set period (commonly 2, 3, 5, or 10 years).

How repayments stay the same During the fixed period:

• Your interest rate is fixed.
• Your monthly repayments typically remain unchanged.

What happens when the fixed period ends When the fixed term finishes, you will usually move onto a rate set by the lender (often referred to as their standard variable rate (SVR)), unless you remortgage or choose another product.

Why people choose fixed rates Fixed-rate mortgages are often chosen for repayment certainty. Knowing what you’ll pay each month can make it easier to plan household finances.

Main drawbacks with fixed rates

• If interest rates fall after you take the mortgage, you generally won’t benefit during the fixed period.
• Some fixed-rate mortgages can include early repayment charges if you repay too much or refinance within the fixed term.

Tracker vs fixed: the practical trade-off

A simple way to think about it:

• Tracker-rate: repayments may be lower if rates fall, but can rise if rates increase.
• Fixed-rate: repayments are usually higher (or at least not always lower) at the start, but you get protection from rate rises during the fixed term.

Neither option is “always better”. The decision is about matching the mortgage structure to your priorities and your ability to absorb changes.

Why fixed and tracker rates move differently

A common misunderstanding is that fixed rates simply “follow” base rate decisions in the same way trackers do. In reality, fixed-rate pricing is influenced by expectations and market pricing well before the Bank of England acts.

How fixed rates are priced Fixed rates are typically influenced by market expectations for future interest rates, including:

• expectations about inflation and economic conditions
• investor expectations about future policy rates
• swap market pricing (often used as a reference for fixed-rate risk)

That’s why fixed rates can change even when the base rate itself hasn’t moved.

How tracker rates are priced Trackers are more mechanical: base rate + margin. That means they usually change when the base rate changes, rather than when markets merely anticipate a future move.

What to consider when choosing between them

1. How sensitive is your budget to payment changes? If a rise in monthly payments would cause stress, a fixed rate may be more suitable because it limits uncertainty.

If you have a buffer and can manage potential increases, a tracker could be worth considering—particularly if you’re comfortable with variable costs.

2. Your expectations for interest rates (and how much you trust them) It’s difficult to predict where rates will go. Even if you believe rates will fall, the timing and pace matter.

A fixed rate can be viewed as paying for predictability, while a tracker can be viewed as accepting variability in exchange for potential upside.

3. How long you expect to stay in the property Your likely time horizon matters:

• If you might move or refinance within the fixed period, early repayment charges and flexibility become important.
• If you expect to stay longer, the balance between certainty and potential savings becomes clearer.

4. Flexibility needs (overpayments and refinancing) Some mortgages allow overpayments and partial repayments with different rules depending on the deal.

If you anticipate making extra payments or you might want to refinance, it’s important to understand how the mortgage deal handles early repayment.

5. The “after the deal” rate Both tracker and fixed deals can end, and your mortgage will then move to another rate.

When comparing options, it’s useful to consider not only the initial period, but also what happens when that period ends.

When a tracker-rate mortgage may suit you

A tracker could be a better fit if you:

• Prefer a mortgage that can reduce payments if interest rates fall.
• Have a budget that can handle potential increases.
• Are comfortable with repayment variability.
• Are planning to stay long enough for the tracker structure to matter.

When a fixed-rate mortgage may suit you

A fixed rate may be a better fit if you:

• Want stability and predictability for budgeting.
• Would struggle with payment increases if interest rates rise.
• Value certainty over the possibility of benefiting from falling rates.
• Plan to remain on the mortgage for at least the length of the fixed term.

Key takeaways

• Trackers follow a reference rate (often the BoE base rate), so repayments can go up or down.
• Fixed rates keep repayments stable for a set period, offering protection from rate rises.
• The “best” option depends on your budget flexibility, time horizon, and how much you value certainty vs potential savings.