The Ultimate Invoicing Tool
If you run a business, dealing with sales tax, VAT, or GST is a daily headache. This calculator allows you to instantly add the correct tax amount to your invoices before sending them to clients.
Reverse-Calculate Tax for Expenses
When you buy a coffee or a piece of software for your business, the receipt often just shows the total price. To claim it as a business expense, you need to extract the tax. You can't just subtract 20% from the total—you have to use reverse tax math. Our "Remove VAT" mode does this perfectly.
Frequently Asked Questions
Select 'Add VAT', enter the net amount, and enter your local tax rate (e.g., 20%). The calculator will tell you the exact tax amount to add, and the final gross total.
This is much harder to do manually! Select 'Remove VAT', enter the total price you paid, and enter the tax rate. The calculator uses reverse mathematics to isolate the original net amount.
They are essentially the same type of consumption tax. The UK and Europe call it Value Added Tax (VAT), while Australia, Canada, and India call it Goods and Services Tax (GST).