What to Include in an Invoice: Complete Checklist

Missing information on your invoice can delay payment or create legal issues. Here's a comprehensive checklist to ensure every invoice is complete and professional.

Mandatory Invoice Information

1. Invoice Header

• The word "INVOICE" clearly displayed
• Your company logo (optional but professional)

2. Invoice Number

• Unique sequential number (e.g., INV-001, INV-002)
• Never reuse invoice numbers

3. Important Dates

• Issue date: When the invoice was created
• Due date: When payment is expected
• Service/delivery date (if different)

4. Your Business Details

• Legal business name
• Full business address
• Phone number
• Email address
• Website (optional)
• Tax ID or VAT number (if applicable)

5. Client Information

• Client's legal name or business name
• Contact person name (if applicable)
• Full billing address
• Additional contact details

6. Itemized Services/Products

For each line item:

• Detailed description of service/product
• Quantity or hours
• Unit price or hourly rate
• Line item total (quantity × rate)

7. Financial Breakdown

• Subtotal (before tax)
• Tax rate and amount (VAT, sales tax, GST)
• Any discounts applied
• Total amount due (prominent display)

8. Payment Terms

• Net 30, Net 15, Due on Receipt, etc.
• Late payment fees or penalties (if applicable)
• Early payment discounts (if offered)

9. Payment Methods

• Bank transfer details
• Bank name
• Account name
• Account number
• Sort code or routing number
• Online payment links
• Credit card acceptance
• Check mailing address

Optional But Recommended

Purchase Order Number

Reference the client's PO number if provided.

Project Reference

Include project name or reference number for easy tracking.

Notes Section

• Thank you message
• Payment instructions
• Specific terms or conditions
• Next steps or follow-up actions

Terms and Conditions

• Cancellation policy
• Refund policy
• Ownership rights
• Warranty information

Region-Specific Requirements

United Kingdom

If VAT registered:

• Your VAT registration number
• Customer's VAT number (B2B transactions)
• Detailed VAT breakdown
• Gross and net amounts

United States

• Federal EIN (for corporations)
• State sales tax ID (if applicable)
• Sales tax by jurisdiction (if multi-state)

European Union

• VAT number (mandatory for VAT-registered businesses)
• Currency clearly stated
• Cross-border transaction notes

Australia

• ABN (Australian Business Number)
• GST amount (if applicable)
• "Tax Invoice" designation for GST claims

Professional Touches

While not required, these enhance professionalism:

• Consistent Branding: Use your brand colors and fonts
• Professional Layout: Clean, easy-to-read design
• Contact Person: Name of person to contact with questions
• Reference Links: Link to original quote or contract

Common Mistakes to Avoid

❌ Missing or duplicate invoice numbers

❌ No payment due date specified

❌ Vague service descriptions

❌ Mathematical errors in totals

❌ Incorrect client information

❌ Missing tax information

❌ Unclear payment methods

Quality Check Before Sending

Before sending any invoice, verify:

✅ All calculations are correct

✅ Client information is accurate

✅ Invoice number is unique and sequential

✅ Payment terms are clear

✅ Tax amounts are properly calculated

✅ Payment methods are listed

✅ Professional appearance

✅ PDF format (prevents editing)

Create Perfect Invoices Every Time

Our free invoice generator automatically includes all essential elements, calculates totals, and exports professional PDFs.

Disclaimer: This guide provides general information. Consult with an accountant about specific requirements for your business and location.