How to write an invoice
A well-written invoice is clear, complete, and easy for your client to pay. This guide covers every part of an invoice, what each term means, why you should document it, and examples you can use.
Parts of an invoice: definitions
Header and title
What it is: The word “Invoice” (or “Bill,” “Statement”) at the top so the reader knows what the document is.
Why document it: Removes ambiguity. In some countries, “invoice” has legal meaning (e.g., tax or payment due). A clear title helps accounting and disputes.
Invoice number
What it is: A unique reference for this invoice (e.g. INV-001, 2024-003, or a custom scheme).
Why document it: Lets you and the client track payments, follow up (“we haven’t received payment for INV-007”), and match payments to the correct job. Essential for audits and bookkeeping.
Invoice date
What it is: The date you issue the invoice.
Why document it: Establishes when the debt was created, starts the clock for payment terms, and helps with tax and record-keeping.
Due date
What it is: The date by which payment is expected (e.g. “Net 30” = 30 days from invoice date).
Why document it: Sets clear expectations, reduces “when do I pay?” questions, and supports late fees or reminders if you use them.
Bill-from (seller) information
What it is: Your business or name, address, phone, email, and optionally logo, website, or tax ID.
Why document it: The client needs to know who to pay and how to contact you. Legal and tax rules often require correct seller details on invoices.
Bill-to (buyer / client) information
What it is: The client’s name (or company), address, and often a contact or purchase order number.
Why document it: Ensures the invoice is routed to the right person or department and matches their records. Needed for their accounting and for your records.
Line items (description, quantity, rate, amount)
What it is: A table (or list) of what you’re charging for. Each line usually has:
- Description: What was delivered (service or product).
- Quantity: How many (hours, units, days, etc.).
- Rate (or unit price): Price per unit.
- Amount: Quantity × rate for that line.
Why document it: This is the core of the invoice. Clear line items reduce disputes (“what is this charge?”), support your rate, and give the client a breakdown they can approve and pay.
Subtotal
What it is: Sum of all line-item amounts before tax, discounts, or shipping.
Why document it: Shows the base amount due and makes it obvious how tax and other adjustments are applied.
Tax
What it is: Sales tax, VAT, GST, or other applicable tax, with the rate and name (e.g. “VAT 20%”).
Why document it: Many jurisdictions require tax to be shown separately. It clarifies the tax amount and helps both sides with compliance and reclaiming tax where allowed.
Discounts and adjustments
What it is: Any deduction (early-pay discount, credit, promotion) or addition (shipping, fee) applied after the subtotal.
Why document it: Makes the final total traceable and avoids confusion or disputes about why the total differs from the subtotal.
Total (amount due)
What it is: The final amount the client must pay (after subtotal, tax, discounts, and adjustments).
Why document it: This is the number the client should pay. Stating it clearly reduces errors and speeds payment.
Payment terms
What it is: When and how to pay (e.g. “Net 30,” “Due on receipt,” “50% upfront, 50% on delivery”) and acceptable methods (bank transfer, check, card, PayPal, etc.). You can also add late fees or interest if you use them.
Why document it: Aligns expectations, reduces “how do I pay?” and “when is it due?” questions, and gives you a basis for reminders or late fees.
Notes or memo
What it is: Optional space for project name, contract or PO reference, special instructions, or thank-you message.
Why document it: Helps the client match the invoice to a project or order and can improve relationship and clarity.
Payment instructions
What it is: Where to send payment (bank details, payment link, address for checks) and any reference to include (e.g. “Quote invoice number on transfer”).
Why document it: Without this, the client may not know how or where to pay, which delays payment.
Why you need to document every part
- Get paid faster: Clear totals, due dates, and payment instructions make it easy for the client to pay correctly and on time.
- Avoid disputes: Descriptions, quantities, and rates in black and white reduce “what is this?” and “we didn’t agree to that” conversations.
- Legal and tax: Many places require certain fields (seller/buyer details, tax, dates). Complete invoices support compliance and audits.
- Records: You and the client need a single document that shows what was done, when, and for how much. Invoices are that record.
- Professional image: A complete, well-written invoice builds trust and makes you easier to work with.
Examples
Example line item descriptions (services)
Vague (avoid):
- “Consulting”
- “Services”
- “Work completed”
Clear (prefer):
- “Strategy consulting – Q1 2024 roadmap (8 hours @ $150/hr)”
- “Website design – homepage and 3 inner pages, responsive layout”
- “Copywriting – 5 blog posts, 800–1,000 words each, 1 round of revisions included”
- “Monthly retainer – January 2024 – content and social media management”
Example line item descriptions (products)
Vague (avoid):
- “Supplies”
- “Materials”
Clear (prefer):
- “Office supplies – 10 reams paper, 5 toner cartridges, 20 binders”
- “Construction materials – lumber and hardware per quote #4421”
- “Product – Widget Pro (SKU: WP-100), qty 50 @ $12.00/unit”
Example payment terms
- Net 30: Payment due within 30 days of invoice date.
- Due on receipt: Payment due as soon as the client receives the invoice.
- Net 15: Payment due within 15 days of invoice date.
- 2/10 Net 30: 2% discount if paid within 10 days; otherwise full amount due in 30 days.
- 50% due on signing, 50% on delivery: Half upfront, half when work or goods are delivered.
- Payment due within 7 days. Accepted methods: bank transfer, check, or PayPal. Please reference invoice number on payment.
Example invoice block (plain text)
INVOICE
Invoice number: INV-2024-012
Invoice date: March 1, 2024
Due date: March 31, 2024
BILL FROM:
Your Business Name
123 Main St, City, State ZIP
email@yourbusiness.com | (555) 123-4567
BILL TO:
Client Company Inc.
456 Oak Ave, City, State ZIP
Attn: Jane Smith
DESCRIPTION QTY RATE AMOUNT
Consulting – Project Alpha 10 hr $150.00 $1,500.00
Design review – 2 rounds 2 hr $120.00 $240.00
-------------------------------------------
SUBTOTAL $1,740.00
Sales tax (8%) $139.20
-------------------------------------------
TOTAL DUE $1,879.20
Payment terms: Net 30. Pay by check or bank transfer.
Include invoice number INV-2024-012 with payment.
Thank you for your business.
Next step
Use our invoice builder to create an invoice with all these parts. Add your details, clear line items, and payment terms, then download or send to your client.