Freelance project
Base amount is $1,200 and tax is 20%.
Invoice total is $1,440.
This gives you the full amount to place on the invoice.
Invoice Calculator
Use this when you want a clean invoice total before you send it to a client or customer.
Inputs
Invoice Calculator
Calculate the invoice total after adding tax to the base amount.
Results
Invoice total
See the base amount, tax, and final total together.
Amount
$2,500.00
Original invoice amount.
Tax amount
$250.00
Tax added to the invoice.
Total
$2,750.00
Final invoice total.
Quick take
A quick read before you calculate
Use this when you want a clean invoice total before you send it to a client or customer.
Formula
Invoice formula
Examples
2-3 real scenarios to make the result easier to trust.
FAQ
Clear answers to the questions people usually ask first.
Formula
Invoice formula
Tax amount = Base amount × Tax rate. Invoice total = Base amount + Tax amount.
It is a simple way to turn a pre-tax fee into the full amount the client should pay.
Examples
Retainer fee
Base amount is $2,500 and tax is 10%.
Invoice total is $2,750.
Good for monthly retainers where tax is added on top.
Small job
Base amount is $480 and tax is 15%.
Invoice total is $552.
Useful for quick estimates before sending the invoice draft.
When to use
Use it when drafting invoices, quoting new work, or checking whether tax is being added correctly.
Common mistakes
- Adding tax twice after the invoice is already grossed up.
- Forgetting to change the tax rate for a different client region.
- Using the invoice total as if it were the full take-home amount.
FAQ
Is this the same as a receipt total?
Yes, in practice it is the amount due after tax is added to the base amount.
Can I use this for deposits?
Yes. Just enter the deposit base amount and the tax rate you need to apply.
Next step
Keep invoices and payments tidy
QuickBooks or Xero can help if you want invoicing, expenses, and payment history in one place.
Recalculate the total whenever the base amount or tax rate changes.