When a lender quotes you an interest rate, it is either fixed or variable. Understanding the difference can help you work out which type of loan suits your situation before you commit to borrowing.
This article is information only. It explains how fixed and variable interest rates work on loans. It does not constitute financial advice, and it does not assess your personal circumstances.
What is the difference between a fixed and variable rate?
A fixed interest rate stays the same for the entire loan term. Your monthly repayment is the same in month one as it is in month 36 (or however long you borrow for).
A variable interest rate can change. It may be tied to an external benchmark, such as the Bank of England base rate, or set at the lender's discretion within the bounds of your loan agreement. If the rate rises, your repayment rises. If the rate falls, your repayment falls.
For most unsecured personal loans in the UK, fixed rates are the norm. Variable rates are more commonly seen on mortgages, credit cards, and some overdrafts.
How do fixed and variable rates compare?
The table below sets out the main differences side by side.
| Fixed rate | Variable rate | |
|---|---|---|
| Monthly repayment | Same every month | Can change |
| Total repayable | Known upfront | Changes if rate changes |
| Budgeting | Easy to plan around | Harder to predict |
| Benefit if rates fall | No, your rate stays put | Potentially yes |
| Risk if rates rise | None, you are protected | Repayments could increase |
| Common product types | Most personal loans, some car finance | Mortgages (SVR/tracker), credit cards, overdrafts |
| Early repayment charges | Sometimes apply | Less common |
Who does a fixed rate suit?
A fixed rate tends to suit people who:
- want to know exactly what they will pay each month
- are borrowing for a specific purchase and need a predictable budget
- prefer certainty over the possibility of saving money if rates fall
For example, if you borrow £5,000 over three years at a fixed rate of 7% APR, you know the repayment figure before you sign, and it will not change.
Who does a variable rate suit?
A variable rate may be worth considering if:
- you think interest rates are likely to fall during your loan term
- the loan allows flexible overpayments or early repayment without charges
- you are comfortable with some payment uncertainty in exchange for potentially lower costs
Variable rates are less predictable, so they are harder to plan around on a tight monthly budget.
What drives variable rates in the UK?
Many variable-rate products are linked, directly or loosely, to the Bank of England base rate. When the base rate rises, many variable lending rates follow. When the base rate falls, those rates may fall too, though lenders are not obliged to pass on every change immediately or in full.
The Bank of England's Monetary Policy Committee sets the base rate several times a year. This means a variable-rate borrower can see their repayments change multiple times over a loan's life.
It is worth checking how your lender defines the variable rate in your agreement, whether it tracks the base rate automatically, or whether the lender sets it at their own discretion.
What should you check before choosing?
Before deciding which rate type to look for, a few things are worth reviewing.
Total amount repayable. This is more useful than the headline rate alone. It shows what you will actually pay back in full, including all interest. Both fixed and variable-rate lenders must display this figure before you sign.
The APR. The annual percentage rate includes interest and compulsory charges, expressed as a yearly figure. It allows like-for-like comparison between loan products. The representative APR shown in adverts is the rate offered to at least 51% of successful applicants, your actual rate may differ based on your credit profile.
Early repayment charges. Some fixed-rate personal loans charge a fee if you want to pay off the loan early. This can reduce the flexibility of switching to a better deal later if rates drop. Checking the pre-contractual information document (the SECCI) before signing will show whether a charge applies.
Loan term. A longer term usually means lower monthly repayments, but more interest paid overall. This is true for both fixed and variable rate loans.
Your budget. If your monthly budget is tight, a fixed rate removes the risk of a payment rise. That predictability has practical value even if the initial rate is slightly higher than a variable alternative.
A note on personal loans specifically
The vast majority of unsecured personal loans in the UK, the kind used for home improvements, car purchases, weddings, or debt consolidation, come with a fixed interest rate. This is partly a consumer preference (people like to know what they owe each month) and partly how the personal loan market has evolved.
If you are comparing personal loan quotes, you are very likely comparing fixed rates. Variable rate personal loans do exist, but they are less widely offered by mainstream lenders.
Mortgages are the main place where variable rates are prominent and the rate-type decision carries the most financial weight. If you are looking at a mortgage, MoneyHelper has detailed guidance on tracker and standard variable rate mortgages.
FAQ
Are most personal loans in the UK fixed or variable rate? Most unsecured personal loans in the UK come with a fixed interest rate. This means your monthly repayment stays the same throughout the loan term. Variable-rate personal loans exist but are less common. Mortgages and some credit products are more likely to use variable rates.
Can a lender change my fixed rate once I have signed? No. Once you have accepted a fixed-rate loan offer and the agreement is signed, the interest rate is locked for the full term. This is one of the main reasons borrowers choose a fixed rate, certainty about what they will repay each month.
What happens if the Bank of England base rate falls and I have a fixed-rate loan? Your rate stays the same. You will not benefit from a lower base rate during a fixed-rate term. This is the trade-off: certainty in exchange for potentially missing a rate drop. If your loan has no early repayment charges, you may be able to repay early and refinance.
Is a lower interest rate always better? Not necessarily. A lower rate over a longer term can cost more in total interest than a slightly higher rate over a shorter term. It is worth checking the total amount repayable, not just the monthly payment or the rate headline.
Does the type of rate affect my credit file? The rate type itself does not affect your credit file. What matters to your credit record is whether you make repayments on time. Both fixed and variable rate loans are recorded the same way by credit reference agencies.
Where can I check whether a loan rate is fixed or variable? The loan's pre-contractual information, called the Standard European Consumer Credit Information (SECCI) document, must state whether the rate is fixed or variable. Lenders are required by FCA rules to give you this before you sign.
Related reading
For a broader look at how loan interest rates are calculated and what affects the rate you are offered, the parent guide Loan interest rates covers the full picture.
Sources
- FCA (Financial Conduct Authority), consumer credit rules, pre-contractual information requirements, and APR disclosure obligations. Source slug:
fca - Bank of England, base rate history and Monetary Policy Committee decisions. Source slug:
bank-of-england - MoneyHelper, plain-English guidance on loan types and mortgage rate types. Source slug:
moneyhelper
- Are most personal loans in the UK fixed or variable rate?
Most unsecured personal loans in the UK come with a fixed interest rate. This means your monthly repayment stays the same throughout the loan term. Variable-rate personal loans exist but are less common. Mortgages and some credit products are more likely to use variable rates.
- Can a lender change my fixed rate once I have signed?
No. Once you have accepted a fixed-rate loan offer and the agreement is signed, the interest rate is locked for the full term. This is one of the main reasons borrowers choose a fixed rate — certainty about what they will repay each month.
- What happens if the Bank of England base rate falls and I have a fixed-rate loan?
Your rate stays the same. You will not benefit from a lower base rate during a fixed-rate term. This is the trade-off: certainty in exchange for potentially missing a rate drop. If your loan has no early repayment charges, you may be able to repay early and refinance.
- Is a lower interest rate always better?
Not necessarily. A lower rate over a longer term can cost more in total interest than a slightly higher rate over a shorter term. It is worth checking the total amount repayable, not just the monthly payment or the rate headline.
- Does the type of rate affect my credit file?
The rate type itself does not affect your credit file. What matters to your credit record is whether you make repayments on time. Both fixed and variable rate loans are recorded the same way by credit reference agencies.
- Where can I check whether a loan rate is fixed or variable?
The loan's pre-contractual information — called the Standard European Consumer Credit Information (SECCI) document — must state whether the rate is fixed or variable. Lenders are required by FCA rules to give you this before you sign.