How is sales tax calculated on a US invoice?

Sales tax is the taxable subtotal multiplied by your combined state and local rate. For example, a $1,000 subtotal at a 8.25% rate adds $82.50, for a $1,082.50 total. The builder applies your rate to the subtotal automatically.

Do I need to charge sales tax?

It depends on your nexus, the buyer's location, and whether the item is taxable. Many services are exempt while goods are usually taxable. Set the rate to 0% if the sale is not taxable. This tool computes the math but does not determine your tax obligations.

What does NET 30 mean on an invoice?

NET 30 means the full balance is due within 30 days of the invoice date. The builder lets you choose NET 7, 15, 30, or 60, or due on receipt, and shows the resulting due date.

What is an EIN and do I need it on invoices?

An EIN is the IRS Employer Identification Number that identifies a US business. It is optional on invoices but often requested by clients for their records, so the builder includes an optional EIN field.

Is the calculation accurate for my state?

The math is exact for whatever rate you enter, but you must supply the correct combined rate for the transaction. Rates vary by state and locality, so confirm the applicable rate before sending the invoice.

US Invoice Builder — Gera Tools

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A clean, correct US invoice in one screen

Getting paid starts with a professional invoice that adds up. This builder takes your business details, client, and line items, applies the sales-tax rate you specify, and produces a USD invoice with subtotal, tax, total, NET payment terms, and a calculated due date — ready to paste into an email.

How it works

Each line item is quantity times unit price, and those line totals sum to the subtotal. Sales tax equals the subtotal multiplied by the combined state-and-local rate you enter, expressed as a percentage. The grand total is subtotal plus tax. Payment terms drive the due date: choosing NET 30 adds 30 days to the invoice date, while “due on receipt” sets the due date to the invoice date. The tool does the arithmetic precisely, but you remain responsible for whether tax applies and at what rate — sales-tax obligations depend on nexus, the buyer’s location, and whether the item is taxable, none of which this tool determines.

Tips and example

Number invoices sequentially (for example INV-1042) so your records reconcile cleanly. If a sale is tax-exempt — many professional services are — set the rate to 0% rather than omitting the line, so the invoice still shows tax was considered. Include your EIN when a client requests it for their bookkeeping. State terms explicitly: a $1,000 subtotal at 8.25% becomes $82.50 tax and a $1,082.50 total due by the NET date shown. Always confirm the correct combined rate for the transaction before sending.