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What to Include in an Invoice: Complete Checklist

4 min read

Introduction

A missing field on an invoice can delay payment, trigger compliance issues, or create disputes. This checklist covers everything a professional invoice should include — whether you're a freelancer, contractor, or small business owner.

The Essential Invoice Checklist

1. The Word "Invoice"

Label the document clearly as an "Invoice" at the top. This distinguishes it from quotes, receipts, or other documents.

2. Invoice Number

A unique sequential number for each invoice. Required for your accounting records and often requested by clients' finance departments.

Good format: 2026-042 or INV-2026-042

3. Invoice Date

The date you issued the invoice. This is the starting point for calculating the due date.

4. Due Date

When payment is expected. Without a due date, clients have no clear deadline. Common terms: Net 15, Net 30.

5. Your Name and Contact Details

  • Full name or registered business name
  • Address
  • Email address
  • Phone number (optional but helpful)
  • VAT/tax registration number (if applicable)

6. Client's Name and Address

The full legal name and billing address of the person or company you're billing. This must match their official records for accounting purposes.

7. Description of Services or Goods

For each line item:

  • Clear description of what was delivered
  • Quantity (hours, units, days)
  • Unit price
  • Line total

Avoid vague descriptions like "work done." Instead: "Website design — 12 hours @ €75/hour."

8. Subtotal

The sum of all line items before taxes or discounts.

9. Taxes (VAT or Other)

If you charge VAT:

  • VAT rate (e.g., 20%)
  • VAT amount
  • Whether prices are shown net (before VAT) or gross (including VAT)

If you're not VAT-registered, a note like "Exempt from VAT" avoids confusion.

10. Discounts (If Any)

If you're applying a discount, show it clearly — the original price, the discount percentage or amount, and the new total.

11. Total Amount Due

The final amount the client owes, including all taxes and after any discounts.

12. Currency

Always specify the currency, especially when working with international clients. Don't assume — be explicit: EUR, USD, GBP.

13. Payment Instructions

How should the client pay? Include:

  • Bank name and account details (IBAN, BIC/SWIFT for international)
  • PayPal or other accepted methods
  • Reference to include (often the invoice number)

14. Payment Terms and Late Fees

State your late payment policy. For example: "Invoices unpaid after 30 days are subject to a 1.5% monthly interest charge."

15. Notes (Optional)

Any additional information: a thank-you message, project reference codes, or special instructions.

Common Mistakes to Avoid

  • Missing due date — clients will pay whenever they feel like it
  • Unclear service descriptions — causes disputes and delayed approvals
  • Wrong client name — their accounting system may reject it
  • No payment method — you'd be surprised how often this is forgotten

Build a Compliant Invoice in 2 Minutes

Use our free invoice generator to create invoices with all the required fields — formatted professionally and ready to download as PDF.