Reference

Financial calculations Functions and data for financial calculations
tax_parameters	Key income tax parameters for the UK.
liability_tax()	Calculate UK income and/or National Insurance taxes
probability_ruin()	Calculate the probability of retirement ruin
probability_ruin_rate()	Calculate the spend rate for a given probability of retirement ruin
rate_annuity()	Get the latest annuity rates for the UK
Error checking Functions to check other functions
stop_not_positive()	Stop the function the value entered is (or is below) zero
stop_not_scalar_double()	Stop the function if zero or more than one value is entered