# Futurebasic/Language/Reference/annuity

## FN Annuity# edit

### Function edit

✔ Appearance ✔ Standard ✔ Console

### Syntax edit

annuityFactor# = fn annuity#( rate, periods )

### Description edit

Returns the annuity factor for the given interest rate and number of periods. The interest rate should be expressed as a fraction of 1; for example, 5.2 percent should be expressed as 0.052.

### Notes edit

`fn annuity#`

uses the following formula: