Whether you're buying a new home or remortgaging your current one, getting the right mortgage isn't just about chasing the lowest headline rate. There are four key decisions that shape what you end up paying — and what fits your circumstances best.
This guide walks through each one, the trade-offs to think about, and where a broker can help.
Decision 1: How much you can borrow
The starting point for any mortgage decision is understanding your parameters: the property price you're aiming at, the deposit or equity you have, and what you can realistically borrow.
Lenders assess applications based on a range of factors, but income and existing credit commitments — loans, car finance, credit cards — are the most important. A general rule of thumb is that lenders use around 4.5 times your income to set their maximum mortgage offer, though there are exceptions in either direction depending on the lender.
For more on what affects your borrowing, see our guide on first-time buyer FAQs (the borrowing question applies to all buyers, not just first-timers).
Decision 2: What mortgage term?
Your mortgage term is how long you'll be paying off the loan. There's a common myth that mortgages have to be over 25 years — they don't. Most lenders today will offer terms of 35 or even 40 years if it fits with your anticipated retirement age.
The trade-off:
Shorter term
- Higher monthly payments
- Less total interest paid over the life of the mortgage
- Mortgage cleared sooner
Longer term
- Lower monthly payments
- More total interest paid over the life of the mortgage
- More breathing room in your monthly budget
Many borrowers start with a longer term for affordability, then make overpayments or shorten the term at remortgage time when their income grows.
The right answer depends entirely on your personal circumstances and budget — a conversation with your adviser will work out what makes sense for you.
Decision 3: What type of interest rate?
Most clients we speak to prefer the security of knowing exactly what they'll pay each month, rather than being subject to market conditions. That's the appeal of a fixed rate — covered in detail in our fixed rate mortgages guide.
But fixed isn't the only option. The main alternatives are:
Tracker rates
Your interest rate "tracks" a reference rate (usually the Bank of England base rate) plus a fixed margin. When the base rate moves, your rate moves with it — up or down.
Variable rates
Your rate can be changed at the lender's discretion, within the terms of your deal. Less predictable than a tracker, but typically cheaper to exit if you want to move.
Both tracker and variable rates usually allow you to exit the deal without penalty, which is the key advantage over a fixed rate. The trade-off is that your monthly payments can fluctuate.
Fixed rates also come in different lengths — most commonly 2-year and 5-year fixes, though 3, 7 and 10-year options exist with some lenders. The right length depends on your plans and how long you want to lock in for.
Decision 4: Product fees vs lower rate
A common misconception is that the lowest interest rate is automatically the best deal. It often isn't.
Many of the lowest-rate products come with a Product Fee payable to the lender — typically in the range of £500 to £1,500. Once you factor that fee in, a slightly higher-rate product with no fee may actually work out cheaper over your fixed period.
The maths depends on:
- The size of your mortgage (the bigger the loan, the more impact the rate has)
- How long the fixed period is
- Whether you can roll the fee into the loan or have to pay it up front
A broker will run these comparisons across multiple products to find the most cost-effective option for your specific situation — not just the lowest rate on a comparison site.
The bottom line
These four decisions together — how much, what term, what rate type, and how to weigh fees — shape what you end up paying over the life of your mortgage. None of them have a universally "right" answer; the right combination depends on your circumstances, your plans, and your appetite for monthly payment certainty.
If you'd like to talk through your options, get in touch with the team. We'll work through each decision with you and recommend the products that genuinely fit your situation. You may also find our guide on the mortgage process useful for understanding what comes next once you've chosen a product.