Interest Rates - The calculator assumes that interest rates will remain the same throughout the calculation. Interest is calculated daily and paid monthly. The Variable rate Cash ISA calculator includes a 2% bonus for new accounts for 12 months after the account opens.
Tax rules relating to ISAs - The calculator assumes the current tax rules, correct as of 6 April 2012, remain the same throughout the calculation. The value of the tax benefits described depend on your individual circumstances. Tax laws could change in the future.
ISA limits - The calculator assumes the ISA limits remain the same throughout the calculation. £5,640 this tax year.
Transferring ISA balances - The calculator allows the insertion of balances from other cash ISA providers. You may transfer balances from cash ISAs held in previous tax years.
Length of Month - Months are of equal length. However given some months are longer than others interest accrued will vary depending upon the month. Number of Weeks/Fortnights in a Year. One year is assumed to contain exactly 52 weeks or 26 fortnights. Thus each year has 364 days.
Deposit frequencies - The calculator assumes deposits are all subscribed on day one.
Rounding - The calculator uses the unrounded payment to derive the amount of interest accrued over the full term of the deposit. As this is rounded down, in some cases the calculator may underestimate interest paid.
The figures provided by the calculator are a guide only and are not a precise calculation.