# Excel formula for Beginners – How to Subtotal by invoice number in Excel

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In this end-to-end excel example, you will learn – How to Subtotal by invoice number in Excel.

### Generic formula

`=IF(COUNTIF(range,criteria)=1,SUMIF(range,criteria,sumrange,"")`

### Explanation

To subtotal values by invoice number, you can use a formula based on COUNTIF and SUMIF. In the example shown, the formula in E5 is:

`=IF(COUNTIF(\$B\$5:B5,B5)=1,SUMIF(\$B:\$B,B5,\$D:\$D),"")`

### How this formula works

This formula uses COUNTIF with an expanding range to first check if the current row is the first occurrence of a given invoice number:

`COUNTIF(\$B\$5:B5,B5)=1`

This expression only returns TRUE when this is the first occurrence of a given invoice number. If so, a SUMIF calculation is run:

`SUMIF(\$B:\$B,B5,\$D:\$D)`

Here, SUMIF is used used to generate a total sum by invoice number, using the amounts in column D.

If the the count is not 1, the formula simply returns an empty string (“”)

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