Use the COUPDAYS function to return the number of coupon days in the coupon period that contains the settlement date.

COUPDAYS(Settlement, Maturity, Frequency[, basis])

 Argument Data type Description Settlement (required) Date The bond settlement date: The date the bond is traded to the buyer. Maturity (required) Date The bond maturity date: The date when the bond expires. Frequency (required) Number The number of coupon payments per year. Enter: 1 for annual 2 for semi-annual 4 for quarterly Basis Number The basis determines how many days exist in a year. A full year has: 360 days when basis US (NASD) 30/360, Actual/360, and EUR 30/360 are used 365 days when basis Actual/365 is used 365 or 366 days when Actual/Actual is used US 30/360 is the default basis for COUPDAYS. It can also be specified by entering 0. To use a different type of day count basis, enter: 1 for Actual/Actual 2 for Actual/360 3 for Actual/365 4 for European 30/360 Learn about the conventions used to calculate the day count for basis.

The COUPDAYS function returns a number.

• The settlement and maturity dates must be valid dates between 01/01/1900 and 12/31/2399.
• The maturity date must be later than the settlement date.
• The frequency must be either 1 (annual), 2 (semi-annual), or 4 (quarterly).
• The basis, when specified, must be either 0 (US (NASD) 30/360), 1 (Actual/Actual), 2 (Actual/360), 3 (Actual/365), or 4 (EUR 30/360).

Most financial functions are currently unavailable in Polaris. Learn more about the differences between Anaplan calculation engines.

COUPDAYS

This example shows how the number of days in the coupon period that contains the settlement date can be calculated when a basis is specified.

 Formula Description Result COUPDAYS(DATE(2018, 1, 15), DATE(2021, 1, 15), 1, 1) This formula uses: a settlement date of 01/15/2018 a maturity date of 01/15/2021 a frequency of 1 (annual) a basis of 1 (Actual/Actual) 365

In this example, the number of days in the coupon period that contains the settlement date is calculated without specifying a basis. As a result, the basis defaults to US 30/360.

 Formula Description Result COUPDAYS(DATE(2018, 1, 15), DATE(2021, 1, 15), 4) This formula uses: the settlement date is 01/15/2018 the maturity date is 01/15/2021 the frequency is 4 (quarterly) 90