Total With Tax
This calculated column uses a SharePoint formula to add tax to an amount using a tax rate. Because it lives in a calculated column, SharePoint fills the value in for every item automatically - no custom development and nothing for your users to type.
How It Works
- What it does: Adds tax to Amount using the Tax Rate.
- What you get: A currency amount – Amount 100 at a 0.08 (8%) rate shows 108.
- If a value is missing: If Amount or Tax Rate is blank, you get a blank or an error instead of a total.
Common Use Cases
- Gross invoice amounts
- Quote totals including tax
- Expense reporting with tax
- Price displays with tax
Details
- Formula Type: Calculated Column
- Formula Category: Numbers & Money
Required Columns
| Display name | Column type |
|---|---|
| Amount | Currency |
| Tax Rate | Number |
| Total With Tax | Calculated |
Prerequisites
- Create the columns the formula reads: Amount and Tax Rate
- Add or edit a few items so there is data for the formula to work with
How to Apply the Formula
- Add a column, choose More…, then select Calculated (calculation based on other columns)
- Set the data type returned from this formula to Number
- Paste the formula below into the Formula box
- Click OK to create the column
Formula
=[Amount]+([Amount]*[Tax Rate])Common Questions About Total With Tax Formula
What does this formula do?
Add a tax rate. It lives in a calculated column, so SharePoint fills the value in automatically for every item.
Which columns do I need to set this up?
You need: Amount (Currency), Tax Rate (Number). The formula reads these to produce its result.
Can I change the formula for my own columns?
Yes. Swap the column names in brackets for your own, and adjust any numbers or text.
If LookBook 365 is code-free and out-of-the-box, why does this example use a formula?
A SharePoint formula is native, declarative configuration, not custom development. It only works with the item’s own fields and simple logic – it cannot run scripts, reach external services, or change other data, and nothing is deployed to your tenant. It keeps working through Microsoft updates. If you would rather not set this up yourself, this is exactly the kind of thing I configure for clients.
Total With Tax Formula Example