COUPNUM Function

Calculates the number of coupon payments from a bond s settlement date to its maturity date

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What is the COUPNUM Function?

The COUPNUM Function[1] is a financial function. It helps calculate the number of coupon payments that we will receive from the settlement date of a bond to its maturity date.


=COUPNUM(settlement, maturity, frequency, [basis])

The COUPNUM function uses the following arguments:

  1. Settlement (required argument) – This is the settlement date of a given security. It is the date after the security is traded to the buyer.
  2. Maturity (required argument) – The date when the security expires.
  3. Frequency (required argument) – This is the number of coupon payments per year. The argument can take a value of 1 (annual payment), 2 (semi-annual payments), or 4 (quarterly payments).
  4. Basis (optional argument) – It specifies the day count basis to be used. It uses one of the following values:

BasisDay Count basis
0 or omittedUS(NASD) 30/360
4European 30/360


The function will default to 0 when omitted. It indicates that the days in the month are counted using the US 30-day method with a 360-day year. When we enter 1 as the basis, the function uses the actual number of days in the month and year. Whereas, when we enter 2, it will count the actual days in the month with a 360-day year while 3 will assume a 365-day year. When we enter 4 as the basis, it is the same as 1 except that it uses the European 30-day method.

How to use the COUPNUM Function in Excel?

To understand the uses of the COUPNUM function, let’s consider a few examples:

Example 1

Let’s see how the COUPNUM function works when we are given the following data:

COUPNUM Function

Additionally, we are told that the count basis should be 1.

Using the formula =COUPNUM(C5,C6,C7,1), we get 5 as the result, which means we will get five coupon payments.

COUPNUM Function - Example 1

Example 2

As the COUPNUM function doesn’t accept dates in text format, we need to convert them into DATE format. Let’s see an example to understand it. Suppose we are given the following data:

COUPNUM Function - Example 2

As we need to find the number of coupon payments that we will receive, using COUPNUM, we will need to first convert the dates given in text format.

The result we get here is 5. The COUPNUM function first converted the dates in text format into proper dates and then calculated the number of days. Here,  we used 1 as the frequency and 2 as the basis.

COUPNUM Function - Example 2a

A few notes about the COUPNUM Function:

  1. #NUM! error – Occurs in the following scenarios:
    • When the settlement date provided is greater than or equal to (≥) the maturity date.
    • When the given frequency argument provided by the user is not equal to 1, 2, or 4.
    • When the given basis argument is a number other than 0, 1, 2, 3 or 4.
  2. #VALUE! error – Occurs in the following scenarios:
    • When the given settlement date or maturity date is not a valid date. Remember that we need to enter dates in date format or else use the DATE function to convert them into proper dates. The function doesn’t work when dates given are in text format. For example, =COUPNUM(“1/25/2023″,”11/15/2024”,2,1) = #VALUE.
    • Any of the arguments given is non-numeric.
  3. The COUPNUM function truncates all arguments to integers.

Additional Resources

Thanks for reading CFI’s guide to the COUPNUM Excel function. By taking the time to learn and master Excel functions, you’ll significantly speed up your financial analysis. To learn more, check out these additional CFI resources:

Article Sources

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