How to Invoice Freelance Clients in 2026

Updated 2026 · 9 min read · General information, not accounting or legal advice

Sending a professional invoice is the difference between getting paid in 14 days and chasing money for three months. In 2026, most freelancers work with clients in several countries, which adds VAT, sales tax and currency questions. This step-by-step guide covers what to put on every invoice, how to number them, how to handle tax, and what to do when a client doesn't pay.

The 9 things every invoice must include

Requirements differ slightly by country, but an invoice that is legal and gets paid fast almost always contains:

• Your full business details — legal name, trading name, address, email and tax ID / VAT number if you have one.
• The client's details — company name, billing address, and VAT number for B2B invoices in the EU.
• A unique invoice number and the issue date.
• A line-by-line description of the work, with quantities, rate and unit (hour, day, project).
• The subtotal, any discounts, and the tax line shown separately.
• The total due, in the currency you want to be paid in.
• Payment terms — due date (e.g. "Net 14" or "Due within 30 days").
• Late payment penalty — interest rate or fixed fee, stated in writing.
• Payment methods — bank details, PayPal, Wise, Stripe link, or a "Pay now" button.

Invoice numbering that keeps auditors happy

• Never reuse a number, even after a cancellation — issue a credit note instead.
• Keep them sequential and unique. Gaps are fine; random duplicates are a red flag.
• Use a readable format: 2026-0001, INV-2026-0142 or CLIENT-0007.
• Restart each calendar year at 0001 to make tax reporting trivial.

VAT and sales tax by region

Region	Tax that applies	When you charge it
EU	VAT (17–27% depending on country)	Over the local threshold (e.g. €10,000 in France); B2B cross-border is usually reverse-charged
UK	VAT (20% standard)	When taxable turnover exceeds £90,000 (2026 threshold)
US	State sales tax (0–10%+)	Only when you have "nexus" in the client's state — most service freelancers never collect it
Australia / NZ	GST (10% / 15%)	Over the registration threshold (A$75,000 / NZ$60,000)

• Under the threshold, don't add a tax line you can't remit. Write "VAT not applicable" if needed.
• EU B2B across borders: no VAT — write "Reverse charge" and include both VAT numbers.
• Check your numbers with a calculator before sending: use our free VAT calculator to add or extract VAT in seconds.

Payment terms that get you paid faster

• Ask for a 30–50% deposit before starting — it filters out bad clients and funds your cash flow.
• Start with Net 14 for new clients; relax to Net 30 once trust is established.
• Offer instant options — card payment links and instant bank transfers remove friction.
• Send a friendly reminder 3 days before the due date, not 3 days after.
• Charge in your own currency or use a multi-currency account to avoid FX losses.

Late payment: what you can charge

• EU & UK: the Late Payment Directive allows statutory interest (base rate + 8 points) plus a fixed recovery fee (€40 / £40) after 30 days past due.
• US: no federal rule — your contract governs. Common practice: 1–1.5% per month after 15–30 days.
• Always write the penalty on the invoice. If it's not written, you can rarely enforce it.

What to do when a client doesn't pay

1. Day 1 past due: polite reminder with the invoice attached and the payment link.
2. Day 15: firm email — restate the penalty, offer a payment plan if they're genuinely struggling.
3. Day 30: stop work on their projects (your contract clause covers this).
4. Day 45: send a formal demand letter; consider a debt collection service or small claims court.

Use our free payment deadline calculator to track due dates and late days automatically across all your clients.

Checklist before you hit send

• Unique invoice number and correct date ✔
• Your details + client's details complete ✔
• VAT / sales tax correct — or explicitly not applicable ✔
• Amounts match your quote or contract ✔
• Late payment penalty stated ✔
• Due date and payment methods clear ✔
• Sent as PDF from your business email ✔

Tools that make invoicing painless

You don't need paid software to start. Use our free VAT calculator to verify amounts, the payment deadline calculator to track due dates, and the freelance day-rate simulator to price the work before you quote. Upgrade to dedicated invoicing software only when you send more than a handful of invoices per month.

In summary: complete fields, sequential numbering, correct tax treatment, written late fees and a clear due date — that's the recipe for getting paid on time, every time.