Invoice Tax Calculator
Add tax to an invoice subtotal in seconds.
Tax
$0.00
Total
$0.00
What this tool does
Enter your subtotal and tax rate to see the tax amount and final total. Works for VAT, GST, sales tax, or any flat percentage rate — before you create the invoice itself.
How to use it
- 1Enter the invoice subtotal (the sum of all line items).
- 2Enter the tax rate as a percentage, such as 20 for 20%.
- 3The calculator shows tax and the final total.
Worked example
Subtotal $850.00 with 20% VAT → tax $170.00, total $1,020.00.
Frequently asked questions
Does Invoala calculate tax automatically?
Yes. In the invoice generator you enter a tax rate and the preview updates the totals live, including the tax line on the PDF.
Is tax included or added on top?
It depends on your jurisdiction and pricing. This calculator adds tax on top of the subtotal. If you sell inclusive of tax, you can use the VAT calculator to work back to the pre-tax amount.
Do I have to charge tax?
Whether you must charge tax depends on where your business is registered, your revenue, and local rules. Consult a tax professional or your local tax authority to confirm your obligations.
Turn the result into a real invoice
Create a professional PDF from your numbers in under two minutes.
Create an invoice