How to Create an Invoice

An invoice is a simple document that tells a client exactly what they owe, why they owe it, and how to pay. Done well, it gets you paid faster and looks professional. Below is the exact structure professional freelancers, contractors and small businesses use — plus a free invoice template you can edit in your browser and download as a PDF.

1. What every invoice must include

Every professional invoice contains the same core fields. Missing any of them is a common reason invoices get paid late:

• The word "Invoice" and a unique invoice number (e.g. INV-2026-001).
• Your business name, address, email, and — if applicable — tax/VAT ID.
• Your client's name and billing address.
• Invoice date and due date (Net 7, Net 14 or Net 30 are typical).
• A line-by-line breakdown: description, quantity, unit price, line total.
• Subtotal, tax, discounts, and the final amount due.
• Accepted payment methods (bank transfer, card, PayPal, Stripe, etc.).
• Optional but recommended: notes, thank-you message, late-fee policy.

2. How to calculate totals and taxes

Compute a line total as quantity × unit price. Add every line total to get the subtotal. Apply discounts (typically a percentage of the subtotal) before tax. Then apply your local sales tax or VAT to the discounted subtotal to get the final amount due.

Example: 10 hours × $80 = $800 subtotal. A 10% discount reduces it to $720. Add 8% sales tax: $777.60 total due. Our hourly invoice template does this math automatically as you type.

3. Pick the right invoice format

Match the template to how you charge:

• Freelancer invoice — clean, minimal, per-project or per-hour.
• Hourly invoice — hours × rate, ideal for consultants.
• Contractor invoice — labor + materials, milestones.
• Service invoice — cleaning, landscaping, repair.
• Simple invoice — one-off jobs, no frills.

4. Etiquette for sending an invoice

• Send within 24 hours of finishing the work — memory is your ally.
• Attach a PDF (never editable Word) so totals cannot be altered.
• Use a clear email subject: "Invoice INV-2026-014 from [Your Name] — due July 30".
• Include a one-line thank-you and the total inside the email body.
• Send a polite reminder 3 days before the due date, and again if overdue.

5. Common mistakes to avoid

• No invoice number — makes tracking and follow-ups painful.
• Missing due date — clients default to whenever they feel like paying.
• Vague descriptions ("Consulting") — be specific: "Landing page redesign, 12 hours".
• No payment instructions — always list at least one clear method.