What Are the Benefits and Drawbacks of Fixed Interest Rates?

Instead of being based on a prime rate or underlying index, a fixed interest rate is fixed for the duration of the loan agreement.

Interest rates can make the difference between a good bargain and a terrific offer when contacting your bank. But what about a set interest rate? Find out more about fixed interest rates here.

Calculating fixed interest rates

You can use the interest formula below to see how much your payments will be:

Interest is calculated as (Interest Rate / Payments) x Loan Principle.

Therefore, if you took out a £40,000 loan with a 10-year term and an annual interest rate of 5%, you would make the following 12 payments:

(0.05 / 12) x 40,000 = £166.66

To find out the amount that is still owed on a loan that you have already started making payments on, apply the formula below:

Principle – (Repayment – Interest) = New Balance

For illustration, if you have previously returned £5,000, the equation would be as follows:

40,000 – (5,000 – 5%) = £35,250

For as long as your fixed interest rate term is in effect, you can use this formula to forecast your repayments because it won’t fluctuate from month to month.

Definition of fixed interest rates

For the duration of your loan, or at the very least for a defined period of time, a fixed interest rate remains constant. UK banks frequently use fixed interest rates for mortgages and savings accounts. For instance, banks will provide a set interest rate of 5% on your savings for the first year before reducing it to 1% or less. The fact that this interest is frequently withheld until the account matures effectively acts as a “golden handcuff” to keep you as a client for at least a year.

The benefits and drawbacks of a fixed interest rate

A fixed-interest loan offers the security of knowing that your interest rate won’t fluctuate as a result of shifting market conditions, an increase in the prime rate, or any other index rate.

Of course, it also functions the other way. The interest on a fixed-rate loan will remain the same even if index rates decline and your lenders reduce their variable rates.

However, it’s crucial to be aware that a lender may modify your fixed rate in specific situations, so it’s necessary to read and comprehend your loan’s terms and conditions. Any time a fixed rate changes, your lender is normally required to let you know in advance.


As was already discussed, the interest rate affects how much you will be paying back each month. People who require the stability of a fixed price can benefit significantly from a fixed interest rate. A variable rate might be better acceptable for people willing to pay more on the possibility that they might also pay less in the end. A set interest rate can assist in eliminating any uncertainty since interest rates are one of the key considerations when looking for a loan. Finally, a set rate can be useful if you wish to keep a tight lid on your business’s spending.