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SavingRegular savers pay interest only on money that has been in the account. The first month earns 12 months of interest; the last earns one. This calculator shows the actual maturity value, not the inflated figure you get from multiplying headline rate by total deposits.
Runs entirely in your browser — your numbers are never sent to a server.
The headline AER is the annual rate. But because interest accrues on each deposit from the day it lands, the average balance across the term is roughly half the final balance. So on a 12-month saver at 6% AER with £200/month, you earn about £78, not £144 (6% of total £2,400 deposited).
When you can commit the full monthly amount every month, and the headline rate materially beats top easy-access rates. Not when you may need the money early or might miss a month — many providers close the account or forfeit interest.
Because interest accrues on each deposit from the day it lands. The effective rate on your total deposited is roughly half the AER on a 12-month saver.
Yes, unless inside a Cash ISA. It counts towards your Personal Savings Allowance.
Depends on the provider — many close the account or reduce interest if you miss payments.
Illustrative calculation. Not personalised financial advice. Rates, bands and allowances for the 2026/27 UK tax year, verified against gov.uk at time of review. For regulated advice consult an FCA-authorised adviser.