Invoice Calculator
Build a polished invoice total from itemized charges. Add line items, apply discount and tax, include shipping, and track how much remains due after payments received.
| Description | Qty | Rate ($) | Line Total | Action |
|---|---|---|---|---|
| $750.00 | ||||
| $500.00 | ||||
| $570.00 |
Tax is calculated after the discount is applied.
Invoice Summary
Line Item Totals
Discount Amount = Subtotal x Discount %
Tax Amount = (Subtotal - Discount) x Tax %
Invoice Total = Subtotal - Discount + Tax + Shipping
Balance Due = Invoice Total - Amount Paid
What does an invoice calculator do?
An invoice calculator totals line items and then applies discounts, taxes, shipping, and payments already received. It helps you quickly move from raw charges to a client-ready subtotal, tax amount, total due, and remaining balance.
Should tax be applied before or after the discount?
Many businesses apply discounts before tax so sales tax is charged only on the discounted taxable amount. This calculator follows that common workflow by calculating tax after the discount is applied.
Can I use this for products and services?
Yes. Each row can represent an item, hourly service, fixed-fee deliverable, or bundled package. Quantity and rate can be adapted to your billing style as long as each line has a non-negative quantity and rate.
Why track amount paid on the invoice?
Recording deposits or partial payments makes it easier to see the remaining balance due. This is useful for staged projects, retainers, and any invoice that is not paid in full at the time it is issued.
🔗 Related Calculators
📐 Formula
Discount Amount = Subtotal x Discount %
Tax Amount = (Subtotal - Discount) x Tax %
Invoice Total = Subtotal - Discount + Tax + Shipping
Balance Due = Invoice Total - Amount Paid