Fixed-Rate Savings Calculator

Our fixed-rate savings calculator shows interest earned on fixed-term savings bonds. Fixed rates typically exceed easy-access rates in exchange for locking your money away for 1, 2, or 5 years.

Enter the deposit amount, the fixed rate on offer, and the term in months or years. Fixed-rate bonds lock in a rate for a guaranteed period — typically one to five years — in exchange for restricted access during the term. The calculator shows the gross interest earned, the tax position based on your income tax band (interest from fixed bonds counts as income in the tax year the interest is paid or credited), and the net return after tax. Compare the after-tax return against current easy-access ISA rates — for higher-rate taxpayers in particular, the tax-free ISA rate can exceed the after-tax fixed bond rate even when the gross fixed rate is higher. Some fixed bonds allow a one-off penalty-free withdrawal — check terms carefully if there is any possibility you might need access.