Your friend has fixed their mortgage for five years.

Someone at work says they’re taking a tracker because they expect interest rates to fall.

Both sound convinced. You still have to decide which payment comes out of your bank account.

For Peterborough households comparing mortgages, the choice starts with understanding who can change the interest rate the price you pay for borrowing and what happens when they do.

A fixed rate gives you a period of certainty

With a fixed-rate mortgage, your interest rate stays the same for an agreed period, commonly two or five years.

If you keep the borrowing and repayment arrangements unchanged, your monthly payment stays steady during that deal.

That can help when childcare, food and other bills already leave little room for surprises.

If mortgage rates fall, your existing fixed rate does not automatically fall with them.

You can investigate switching, but leaving early may trigger an early repayment charge: a fee for repaying the mortgage or leaving the deal before an agreed date.

A five-year fix also does not mean you will finish paying for the house in five years. It describes how long the rate lasts. You might still be repaying the loan over 25 years or longer.

A tracker follows a rule

A tracker is a type of variable-rate mortgage, meaning its interest rate can change.

It usually follows the Bank of England’s Bank Rate, often called the base rate.

This is the interest rate set by the UK’s central bank, which influences borrowing costs.

Your agreement might say “base rate plus 0.75 percentage points”.

That means the lender adds 0.75 to the base rate to calculate yours.

For illustration, if the base rate were 4%, your mortgage rate would be 4.75%. If the base rate fell to 3.5%, yours would fall to 4.25%, subject to the agreement’s terms and timing.

Those are example figures, not today’s rates or a mortgage offer.

The movement works upwards too. A tracker lets you benefit from a fall, but you need enough room in the household budget to cope with a rise.

Check for a floor, sometimes called a collar.

This is a contractual limit on how far the tracked rate or your mortgage rate can fall.

Nationwide, for example, explains that some trackers have a floor that can stop further reductions reaching the borrower.

“Variable” does not always mean “tracker

A lender’s standard variable rate, usually shortened to SVR, works differently.

The lender sets it under the terms of the mortgage agreement.

It does not have to follow every Bank of England change by the same amount.

This is often the rate borrowers move onto when an introductory deal finishes, unless they arrange something else.

The Financial Conduct Authority, which regulates financial firms, warns that this can mean higher payments.

You may also see a discounted variable mortgage.

That gives you a reduction from the lender’s standard variable rate for an agreed period.

The discount might stay the same while the rate underneath it changes.

So ask what the mortgage follows. “It’s variable” is only the beginning of the answer.

What could a rise cost in pounds?

Consider a £200,000 repayment mortgage over 25 years. A repayment mortgage pays off some of the loan as well as interest each month.

Using the same starting balance and repayment period:

• At 4%, the monthly payment is about £1,056.

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• At 5%, it is about £1,169.

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• At 6%, it is about £1,289.

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These are illustrations calculated with monthly repayments, excluding fees. Actual lender calculations can differ.

The difference between 4% and 6% is roughly £233 a month. Before choosing a changing rate, put that extra payment into your household budget.

What would have to give up or earn extra?

Would fixing help you—or get in your way?

A fixed payment may suit a household that needs certainty.

Someone with more spare income might be comfortable accepting changes.

Your plans for the home count too.

If you expect to move or repay a large amount soon, ask about exit charges and limits on extra payments.

Do not assume every tracker is free to leave.

Compare fees over the same period as well.

A £999 fee spread across a two-year deal is roughly £42 a month, before any interest if you add it to the loan.

That can change how attractive a lower advertised rate looks.

Ask an qualified mortgage adviser to show you the total cost of the deals you qualify for, alongside payments under different rate scenarios.

Nobody can promise which option will turn out cheapest.

What would you ask a mortage expert?

Would you rather know your mortgage payment for the next few years, or accept changes for the chance of paying less?

Send us the question behind your choice.

Perhaps it’s “What happens if I move during a fix?” or

“How much could my tracker payment rise?”

And if someone you know is comparing mortgages, send them this article. It could give them a better starting point for that conversation

with a professional adviser.

Remember this article is just to explain how things work and before you make any decisions you should speak to a qualified mortgage professional.