When you deposit money, the bank makes a commitment to provide you with the advertised annual equivalent rate (AER) until the end of the term. Locking in a guaranteed deposit interest rate is a key benefit of these accounts, which can be particularly valuable at times when interest rates are high or expected to fall.
In return, you commit to not withdrawing your money until the term expires. This makes fixed term savings accounts the least flexible type of savings account available.
The fixed term can be as short as three months or as long as seven years, depending on the savings account.
Because the bank knows they won’t have to return the deposit for an agreed period, they can offer higher deposit interest rates on fixed term savings accounts. Longer fixed terms tend to come with higher interest rates than shorter fixed terms, but not always.