Where applicable, Plum offers you a bonus interest rate that is credited for the stated period after the opening of your Cash ISA account. The bonus rate is calculated in the background on a daily basis, and it will be credited to your account after the bonus period ends.
For example, when the bonus period is 1 year, it will be credited at the beginning of the thirteenth month after the opening of your Cash ISA account. If the bonus period is 3 months, your account will be credited at the beginning of the fourth month after your Cash ISA account is opened.
Before 1 September 2025: Bonus was credited at the end of the thirteenth month after opening the Cash ISA. If the bonus period were 3 months, your account would be credited at the end of the fourth month after your Cash ISA account was opened.
When the bonus period ends, the interest rate will revert to the basic rate plus any new bonus rate we decide to offer at that time. You can read more details about the current Cash ISA interest rates we offer here.
Transfer Ins
Eligibility for the bonus rate for funds transferred in from other providers depends on the date your Cash ISA was activated.
Where a transfer rate is specified in the Bonus rate field here, transferred funds will earn that rate; otherwise, they will earn the basic rate.