How to Invoice US Clients as a Freelancer: Best Practices 2026

US clients expect a specific invoice structure. Missing even one of these fields slows payment: 1. **Your business name + EIN or SSN** — so they can file a 1099 if needed 2. **Client's legal business name + address** 3. **Invoice number** — sequential, unique 4. **Invoice date** AND **Due date** (not "Net 30" — specific calendar date) 5. **Itemized line items** — description, quantity, rate, amount 6. **Subtotal, tax (if applicable), total** — all clearly shown 7. **Payment terms** — how they pay (ACH, check, Wise, etc) 8. **Contact info** for invoice questions Leave any out, and Accounts Payable teams have an excuse to delay payment.

Common terms and real-world payment times: • **"Due upon receipt"** — suggests urgency. Average payment: 12-18 days. • **Net 15** — tight but reasonable for small projects. Average payment: 14-20 days. • **Net 30** — US corporate standard. Average payment: 28-45 days. • **Net 60** — large corporations. Average payment: 50-70 days. Pro tip: always use **specific calendar dates**. "Due March 15, 2026" is clearer than "Net 30 days from March 15" — Accounts Payable systems parse it directly. For new clients, consider 50% upfront or Net 15 until trust is established.

**1. ACH bank transfer (the gold standard):** - Fee: usually $0 - Clearing time: 1-3 business days - US clients prefer this - Requires you to share routing + account number (via secure channel or platform) **2. Wise / Zelle (for smaller amounts):** - Fee: low to none - Clearing time: same-day to 2 days - Works well for agencies, not large enterprises **3. PayPal:** - Fee: ~3.5% of the invoice - Clearing time: instant - Convenient but pricey for large amounts **4. Credit card (via Stripe, Square, etc):** - Fee: ~2.9% + $0.30 - Clearing time: instant - Small businesses and solopreneurs prefer this **5. Paper check (avoid if possible):** - Fee: $0 - Clearing time: 3-7 days + mail time - Enterprise clients still send these. Tell them "ACH is faster, I can send bank details securely"

If you're outside the US but invoicing US clients, two extra considerations: **W-8BEN form:** US clients may ask you for this (for individuals) or W-8BEN-E (for businesses). It's how you certify you're a foreign person for tax withholding purposes. No tax is usually withheld on service income under most treaties, but the form is still required. **Tax ID:** you don't need an EIN or SSN. Your home country tax ID (CNPJ, CIF, VAT ID, etc) suffices. **Currency:** invoice in USD if the client wants USD. Use Wise, Payoneer, or international bank wire to receive.

**Day 0:** Send invoice immediately after work is accepted. **Day 7 before due:** Friendly reminder. > "Hi [Name], just a friendly heads-up that invoice #INV-1234 ($X) is coming due on [date]. Let me know if you need anything to process it." **Day 0 (due date):** Quick ping if no payment. > "Hi [Name], invoice #INV-1234 was due today. Let me know if you need anything from my end!" **Day +3:** Polite follow-up. > "Hi [Name], I wanted to follow up on invoice #INV-1234, now 3 days past due. Is there any issue I can help resolve?" **Day +7:** Firmer follow-up with late fees reminder. > "Hi [Name], invoice #INV-1234 is now 7 days past due. Per our terms, a 1.5% monthly late fee applies. Please advise." **Day +30:** Escalate. Consider collection services or small claims court for larger amounts.

Late fee clauses in US contracts: **Standard (enforceable):** - 1.5% per month (18% APR) — this is the common ceiling in most states - Capped at the amount due - Clearly stated in the original engagement **Not enforceable:** - Rates above state usury limits (vary by state) - Fees added AFTER the fact without prior notice - "Interest on interest" compounding Put the clause in your contract AND on every invoice. Clients are more likely to pay if they see "A late fee of 1.5% per month will apply to invoices past 30 days" on the invoice itself.

Manual invoicing is a tax on your time. A modern invoicing system should: • Auto-generate invoice numbers sequentially • Save client info for reuse • Calculate taxes based on client location • Send professional PDFs via email • Remind clients automatically of due dates • Track paid vs unpaid • Export reports for tax season Faturio does all of this in 3 languages and 8 currencies, perfect for international freelancers serving US clients. Free plan covers 3 invoices/month; Pro plan is $5.90/month for unlimited invoices and clients.