Excel allows us to create subtotal for invoices by age, using the **SUMIF** function. This step by step tutorial will assist all levels of Excel users in creating subtotal for invoices by age.

*Figure 1. The final result of subtotal invoices by age*

**Syntax of the SUMIF formula**

**=SUMIF(range, criteria, sum_range)**

The parameters of the SUMIF function are:

**range**– a range of cells which we want to evaluate**criteria**– criteria for summing data**sum_range**– a range of cells that we want to sum. This parameter is not mandatory, so if it’s omitted, a range will be summed.

**Setting up Our Data for the SUMIF Function**

Our table consists of 4 columns: “Delivery Number” (column B), “Age” (column C), “Invoice Date” (column D) and “Amount” (column E). In cells H3 and H4, we want to get subtotals for the age conditions in the cells G3 and G4.

* Figure 2. Data that we will use in the SUMIF example*

**Create Subtotal of Invoices by Age**

In the cell H3, we want to create the subtotal of all amounts where the age is lower than 25. All other amounts will be summed in the cell H4.

The formula looks like:

**=SUMIF($C$3:$C$9, G3, $E$3:$E$9)**

The **range** is $C$3:$C$9, while the **criteria** is G3. The **sum_range** is $E$3:$E$9. Note that we need to fix both range and sum_range, because they are not changing, only the criteria cell.

To apply the SUMIF function, we need to follow these steps:

- Select cell H3 and click on it
- Insert the formula:
`=SUMIF($C$3:$C$9, G3, $E$3:$E$9)`

- Press enter
- Drag the formula down to the other cells in the column by clicking and dragging the little “+” icon at the bottom-right of the cell.

*Figure 3. Using the SUMIF function to create subtotals by age*

As we can see in Figure 3, rows 7 and 8 have age lower than 25, so corresponding amounts are summed ($1,200 and $250). Therefore, the result of the SUMIF function in the cell H3 is $1,450.

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