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The COUPDAYBS function is one of the financial functions. It is used to calculate the number of days from the beginning of the coupon period to the settlement date.


COUPDAYBS(settlement, maturity, frequency, [basis])

The COUPDAYBS function has the following arguments:

Argument Description
settlement The date when the security is purchased.
maturity The date when the security expires.
frequency The number of interest payments per year. The possible values are: 1 for annual payments, 2 for semiannual payments, 4 for quarterly payments.
basis The day count basis to use, a numeric value greater than or equal to 0, but less than or equal to 4. It is an optional argument. The possible values are listed in the table below.

The basis argument can be one of the following:

Numeric value Count basis
0 US (NASD) 30/360
1 Actual/actual
2 Actual/360
3 Actual/365
4 European 30/360


Dates must be entered by using the DATE function.

How to apply the COUPDAYBS function.


The figure below displays the result returned by the COUPDAYBS function.


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