Fixed or tracker mortgage?
Fixed or tracker mortgage? How the two differ, when each tends to suit, and the Bank Rate level where a tracker stops being cheaper.
Quick answer
A fixed rate stays the same for the length of the deal, so your payment is certain. A tracker follows Bank Rate plus a set margin, so your payment moves when Bank Rate moves. Trackers often start cheaper and some have no early repayment charge, but you carry the risk of rises.
Choosing a fixed or tracker mortgage usually comes down to how much certainty you need, where markets expect Bank Rate to go, and whether you might want to leave early.
Updated today
What markets expect
Reading today’s signals
Six levels, from Easing fast to Severe. Theo lights the gauge up to today’s level.
- Easing fast
- Easing
- Steady
- Building
- High
- Severe

Fixed or tracker mortgage, in the app
Theo’s Fixed or tracker card compares a tracker with no early repayment charge against a fix, on your own mortgage, and shows the Bank Rate level where the tracker stops being cheaper.
Theo’s read
Loading today’s read.
Every weekday Theo writes a plain English read of what moved in the market and what it has usually meant for fixed rates.
Watch Bank Rate
Theo updates trackers the day Bank Rate changes.
Where a tracker stops being cheaper
Enter a fixed rate and a tracker’s margin above Bank Rate. Bank Rate and today’s average 2 year fix are filled in when Theo’s live figures load.
A guide to the break even point, not a prediction. Bank Rate can rise or fall during a deal.
Fixed or tracker mortgage: the difference
| Fixed rate | Tracker | |
|---|---|---|
| Your rate | Stays the same for the deal | Bank Rate plus a set margin |
| Your payment | Certain until the deal ends | Moves when Bank Rate moves |
| Priced from | Swap rates | Bank Rate |
| Early repayment charge | Usually, during the deal | Some trackers have none |
| Suits people who | Want certainty for budgeting | Can absorb rises, or want flexibility |
Fixed rates are priced from swap rates, which reflect where markets expect Bank Rate to go. That is why a fix can cost more than a tracker today: the market is pricing in what it expects over the deal.
The break even point
A tracker costs less than a fix while Bank Rate plus the tracker’s margin stays below the fixed rate. With a 5.00% fix and a tracker at Bank Rate plus 0.80%, the tracker is cheaper while Bank Rate stays below 4.20%. The calculator above works this out with today’s figures.
The break even point tells you how much room Bank Rate has to rise before the tracker costs more. Whether it will rise that far is the uncertain part. See the Bank of England base rate and Theo’s reading of where rates are heading.
When a fixed or tracker mortgage suits
A fix tends to suit people who need to know their payment for budgeting, or who would struggle if rates rose. A tracker tends to suit people who can absorb a rise, expect Bank Rate to fall, or value being able to leave or overpay without a charge, which some trackers allow. Many people choose a tracker with no early repayment charge so they can switch to a fix later if rates start to rise. An FCA-authorised mortgage adviser can weigh this up with you.
Things to check on a tracker
Check the margin, how long the tracker lasts, whether there is an early repayment charge, and whether there is a floor or collar, a minimum rate the tracker will not fall below even if Bank Rate does. For more on how trackers work, see tracker mortgages explained. For the length of a fix, see should I fix for 2 or 5 years.
Common questions
What is the difference between a fixed and a tracker mortgage?
Is a tracker mortgage a good idea at the moment?
Are trackers cheaper than fixed rates?
Can I switch from a tracker to a fixed rate?
Should I get a fixed or tracker mortgage?
What is a tracker collar?
Keep exploring
Theo App Ltd is not authorised by the Financial Conduct Authority and does not give mortgage advice. This page is information only and is not a recommendation. Figures marked illustrative are examples, not offers. Speak to an FCA-authorised mortgage adviser about your own circumstances.
Your home may be repossessed if you do not keep up repayments on your mortgage.

