How to Invoice a Client in United States

A complete guide to Sales Tax-compliant invoicing

A US invoice needs your legal business name, registered address, and EIN or SSN, plus a unique sequential invoice number, line items with quantity and unit price, and payment terms such as Net 30. Sales tax depends on whether you have nexus in the buyer's state and on what you sell; rates vary by state, from 0% to 10.25%. Collect each client's W-9, because payments of $600 or more to a contractor trigger a 1099-NEC.

Invoicing in United States requires compliance with local Sales Tax regulations and specific formatting standards. Whether you are a freelancer, small business owner, or agency, this guide covers everything you need to create professional, legally compliant invoices in United States using USD ($).

Legal Requirements for United States Invoices

✓Include your W-9 information and Employer Identification Number (EIN) or Social Security Number on all invoices for tax reporting purposes.
✓Determine sales tax nexus for each state where you have a physical or economic presence, and charge the appropriate state and local sales tax rates.
✓Track cumulative payments to each vendor and client against the $600 threshold for 1099-NEC or 1099-MISC reporting at year end.
✓Clearly specify payment terms such as Net 30, Net 60, or due on receipt, and include late payment penalties if applicable.
✓Provide detailed line item descriptions including quantity, unit price, and any applicable discounts to ensure clarity and avoid disputes.
✓Display your full legal business name and registered business address on every invoice, matching the information on file with the IRS.
✓Follow standard net terms conventions (Net 15, Net 30, Net 60) and clearly state the due date to maintain professional payment expectations.

Step-by-Step: Create an Invoice for United States

Follow these steps to create a compliant United States invoice with proper Sales Tax handling.

Estimated time: About 10 minutes

1
Set Up Your Business Information
Enter your legal business name, EIN or SSN, registered business address, phone number, and email. This information must match your IRS filings and will appear on every invoice you create.
2
Add Client Details with W-9 Information
Enter your client's full legal name or business name, address, and contact information. For US-based clients, collect their W-9 form to ensure you have the correct taxpayer identification number for potential 1099 reporting.
3
Create Detailed Line Items
Add each product or service as a separate line item with a clear description, quantity, unit price, and any applicable discounts. Detailed descriptions help prevent payment disputes and make record-keeping easier for both parties.
4
Handle Sales Tax by State
Determine whether you have sales tax nexus in the client's state. If so, apply the correct state and local tax rates. Some states have no sales tax (e.g., Oregon, Montana), while others have combined rates exceeding 10%. Services may be taxed differently than goods depending on the state.
5
Set Payment Terms and Due Date
Choose standard payment terms such as Net 30 or Net 60 and set a clear due date. Include accepted payment methods (ACH, wire transfer, check, credit card) and specify any late payment fees or early payment discounts.
6
Review Invoice for Accuracy
Double-check all amounts, tax calculations, client details, and your business information. Ensure the invoice number follows your sequential numbering system and that all required fields are present for tax compliance.
7
Download or Send the PDF Invoice
Generate a professional PDF invoice and send it to your client via email. Keep a copy for your records, as the IRS requires you to retain financial records for at least three years from the date of filing.
8
Track Payments and Maintain Records
Record when payments are received and follow up on overdue invoices. Maintain organized records of all invoices for 1099 reporting, quarterly estimated tax payments, and annual tax filing purposes.

Tips for Invoicing in United States

Net 30 is the most common payment term in the US. If cash flow is a concern, consider offering a 2% discount for payment within 10 days (2/10 Net 30) to incentivize early payment.
Track your sales tax nexus across all states where you sell. Economic nexus thresholds (typically $100K in sales or 200 transactions) can trigger tax collection obligations even without a physical presence.
Keep a running total of payments to each contractor and client throughout the year. Once payments to a single payee exceed $600, you are required to issue a 1099-NEC form.
Offer multiple digital payment options such as ACH transfers, credit cards, or platforms like PayPal and Venmo to reduce payment friction and speed up collections.
Set aside 25–30% of your income for quarterly estimated tax payments to the IRS. Missing quarterly deadlines can result in underpayment penalties.

United States Invoicing FAQ

Do I need to charge sales tax on my invoices?

Whether you need to charge sales tax depends on your nexus in the buyer's state, what you're selling, and the state's tax rules. Physical goods are generally taxable in most states, while services and digital products vary. You should check each state's Department of Revenue website or consult a tax professional to determine your obligations.

When do I need to report payments on a 1099?

If you pay a non-employee (such as a freelancer or contractor) $600 or more during the tax year, you must file a 1099-NEC form with the IRS and provide a copy to the payee. This applies to payments for services, not for goods. The deadline for issuing 1099-NEC forms is January 31 of the following year.

What fields are legally required on a US invoice?

While the US does not have a single federal law mandating specific invoice fields, best practice and state-level requirements generally call for your business name and address, client details, a unique invoice number, date, itemized list of goods or services, total amount, and payment terms. Including your EIN is important for tax reporting and professional credibility.

What are standard payment terms for US invoices?

The most common payment terms in the US are Net 30 (payment due within 30 days), followed by Net 15, Net 60, and Due on Receipt. Many businesses also offer early payment discounts such as 2/10 Net 30, meaning the client gets a 2% discount if they pay within 10 days. Late payment fees typically range from 1% to 1.5% per month.

Are there different invoicing rules for each state?

Yes, invoicing rules can vary by state, particularly regarding sales tax. Five states have no sales tax at all (Alaska, Delaware, Montana, New Hampshire, Oregon), while others have varying rates and rules about what is taxable. Some states require specific disclosures on invoices, and local jurisdictions may add additional tax layers on top of state rates.