Invoice Total Calculator
The Invoice Total Calculator computes a final invoice amount from a subtotal, applying a discount, then tax, then adding shipping — matching how most invoices are structured.
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How This Tool Works
Enter your invoice subtotal, any discount percentage, your tax rate, and shipping charges to calculate the exact total due.
Formula & Method
Discount amount = subtotal × discount%. After-discount subtotal = subtotal − discount. Tax = after-discount subtotal × tax%. Total = after-discount subtotal + tax + shipping.
Example Calculation
A $500 subtotal with a 10% discount ($450 after discount), 8% tax ($36), and $25 shipping totals $511.
Frequently Asked Questions
Is tax calculated before or after the discount?+
This calculator applies the discount first, then calculates tax on the discounted amount — the standard approach used by most invoicing software.
Is shipping taxed?+
This calculator does not tax shipping charges, matching common practice, though tax rules on shipping vary by state and product type — check your local requirements.
Can I use this for quotes as well as invoices?+
Yes, the same math applies whether you're preparing a quote, estimate, or final invoice.
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