Step-by-step guide

How to Make an Invoice

A practical, no-fluff guide for freelancers and small businesses. Eight steps, every method (handwritten, Word, Excel, online), and the legal fields you cannot skip.

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TL;DR

An invoice needs five things to be valid: a unique invoice number, your details, the buyer's details, an itemized list of what you're billing for, and a clear due date. The fastest way to create one is a free online generator that produces a branded PDF in under a minute. Below is the long version — every step, every method, and how to avoid the mistakes that delay payment.

The 60-second version

If you just need to send an invoice today, this is the shortest path that still produces a professional, legally adequate document.

  1. 1Open a free online invoice generator (no signup needed).
  2. 2Fill in your business name, the client, and the line items.
  3. 3Set the invoice number, issue date, and due date (Net 30 is the standard default).
  4. 4Review the totals and tax line.
  5. 5Download as PDF and email it, or share the payment link.
Open the free invoice generator

The 8 steps to make an invoice

Whether you're using a generator, Word, or a spreadsheet, every invoice goes through the same eight decisions. Get them right once and you can reuse the structure for every future invoice.

1

Add your business details and a logo

Top-left of the invoice: your registered business name (or your full legal name if you're a sole trader), address, country, tax ID (EIN, VAT, GST, ABN — whichever applies in your jurisdiction), and contact email. A logo is optional but it sharply increases the chance the invoice gets paid on time — buyers treat branded invoices as more legitimate.

Tip: If you bill internationally, include the country and a country-code phone number. AP teams in other countries sometimes reject invoices missing this.
2

Add the bill-to information

The buyer's legal entity name, AP contact (or the person who hired you), email, address, and — for B2B — their tax ID or PO number if their procurement requires one. Sending an invoice to the wrong entity name is the #1 reason invoices sit unpaid for months.

Tip: Ask new clients explicitly: "What entity name and address should this invoice be addressed to?" Don't guess from their website.
3

Assign a unique invoice number

Every invoice needs a sequential, unique identifier. The simplest format is INV-2026-0001, INV-2026-0002 — year-prefixed and zero-padded. Tax authorities in most countries require sequential numbering with no gaps, so don't restart at 1 each month.

Tip: If you delete a draft, do NOT skip the number. Re-use it for the next real invoice. Gaps in your invoice numbers make audits awkward.
4

Set the issue date and due date

The issue date is when you create the invoice. The due date is when payment is owed — Net 30 (30 days after the issue date) is the B2B default. For new clients, smaller jobs, or higher risk, use Net 7 or Due on Receipt. State the term explicitly: write both "Net 30" and the calendar date.

Tip: Always state "Net 30 from invoice date" — some buyers will otherwise count from the date their AP team received the invoice and add a week or two.
5

List each line item with description, quantity, rate, and amount

One line per deliverable. Each line should answer three questions: what it is (clear description), how much (quantity × rate), and the total. Vague line items like "Consulting services" invite disputes — write "Strategy consulting, May 2026, 12 hours @ $200/hr."

Tip: If you're billing for a fixed-price project, still break it into milestones or phases. "Website redesign — discovery phase" is more defensible than just "Website redesign."
6

Add subtotal, tax, and total

Subtotal first (sum of all line items), then any applicable tax (VAT, GST, sales tax) on a separate line, then the grand total. Tax handling varies by country — if you're not registered to charge tax, leave the tax line off entirely rather than writing $0.

Tip: Show the tax rate (e.g., "VAT 20%") on the same line as the tax amount. Just "Tax: $40" with no rate is a flag for AP teams.
7

Specify how to pay

Tell the buyer exactly how to pay you. Bank transfer details, a Stripe/PayPal payment link, or a check mailing address. The fewer steps the buyer has to take, the faster you get paid. A clickable payment link cuts average payment time by ~40% in our customers' data.

Tip: Offer at least two payment methods. Some companies will only pay by ACH/wire; others only by card. Limiting yourself to one method limits how fast you get paid.
8

Send as a PDF (not Word, not a spreadsheet)

Always send invoices as PDF. PDF preserves formatting, can't be accidentally edited, and is what AP systems are built to ingest. Attach the PDF to a short email that includes the invoice number, the amount, the due date, and the payment link in the body.

Tip: Filename matters. Use "InvoiceCat-INV-2026-0001.pdf" rather than "invoice.pdf" — it's easier for the buyer to find later, which means fewer "can you re-send?" emails.

What every invoice must include

These are the fields that make an invoice legally adequate in most jurisdictions. Country-specific requirements (VAT IDs in the EU, e-invoicing in some Latin American countries) add to this list — never subtract from it.

Required on every invoice

  • The word "Invoice" clearly shown — not "Bill," not "Statement"
  • A unique, sequential invoice number
  • Your business name, address, and tax ID (where applicable)
  • The buyer's name, address, and (for B2B) their tax ID
  • Issue date and due date
  • An itemized description of the goods or services
  • Quantity, unit price, and line total for each item
  • Subtotal, tax (if applicable), and grand total
  • Currency (write "USD" or "€" — never just a $ sign for international invoices)
  • Payment terms (Net 30, Due on Receipt, etc.) and accepted methods

Recommended but not required

  • A logo and brand colors
  • A purchase order (PO) number if the buyer issued one
  • Bank account / payment link
  • Late-payment terms (e.g., "1.5% per month after due date")
  • A short thank-you note
  • Project or contract reference number

Every way to make an invoice — compared

There are five common ways people create invoices. Each has trade-offs in speed, look, and reliability.

MethodSpeedLookMathSendGood forWatch out
Free online generator1–2 minBranded, professional PDFAutoEmail or payment linkFast, reliable, no spreadsheet errors, mobile-friendlyRequires internet
Microsoft Word10–15 minDecent if you start from a templateManualExport to PDF, attach to emailFamiliar, works offlineEasy to make math errors, not designed for invoicing, formatting drifts
Excel / Google Sheets15–20 min first timePlain unless heavily styledAuto via formulasExport to PDF, attach to emailMath is reliable, easy to duplicate next monthLooks like a spreadsheet, not an invoice; PDF export quality varies
Handwritten / paper5 minUnprofessional for B2BManualMail or scanNo tools requiredSlow to pay, hard to file, unreadable for AP teams
Accounting software (QuickBooks, Xero)5 min after setupBranded, professionalAutoBuilt-in email + paymentTied into your books and tax filingMonthly subscription, overkill if you send <5 invoices/month

For most freelancers and small businesses sending fewer than 30 invoices a month, a free online generator is the right answer — it has the speed of accounting software, the cost of paper, and produces a PDF that AP teams accept without question.

Don't start from scratch — use a template

Whether you're a designer, developer, photographer, consultant, or contractor, the line items and language vary by industry. We've built free PDF templates for the most common professions so you don't have to figure out what an "invoice for graphic design work" should look like from a blank page.

Browse free invoice templates

How to send the invoice (and what to write in the email)

The invoice itself is only half the job. The email you send it with determines whether it gets opened the same day or sits in a Gmail tab for a week.

Subject line that gets opened

Use "Invoice INV-2026-0001 — [Your Business] — Due 2026-06-02" rather than "Invoice attached." The subject should let the buyer file or pay it without opening the email.

Body kept under 4 sentences

State the amount, the due date, the payment method, and a short thank-you. Long emails get postponed; short emails get acted on.

Send to the right person

On B2B invoices, CC accounts payable ([email protected] is a common pattern) in addition to your direct contact. The contact may be on PTO; AP isn't.

Send Tuesday or Wednesday morning

Invoices sent Friday afternoon or Monday morning sit longest. Tuesday/Wednesday morning has the highest same-week pay rate in our data.

Common invoice mistakes that delay payment

Almost every late payment traces back to one of these five mistakes. Avoid them and your average payment time drops by weeks.

1

Vague line items

"Services rendered" forces the buyer to ask their team "what was this for?" — and that question is what triggers the delay. Be specific: dates, hours, and what you delivered.

2

Wrong entity name

If the buyer's parent company pays the bills but you addressed the invoice to the brand name, AP rejects it. Always confirm the legal entity at onboarding.

3

No PO number when one was issued

If your contact gave you a PO number, every invoice for that engagement must reference it. AP systems route invoices by PO; without it your invoice goes into the manual-review pile.

4

Missing or unclear payment instructions

If the buyer has to email you back to ask "how do I pay?" you've lost a week. Put the payment link or bank details on the invoice itself, not in the email.

5

Sending without a due date

An invoice with no due date is a suggestion, not a bill. Always specify the term (Net 30, Due on Receipt) AND the calendar date.

Country-specific invoice requirements

Some countries have additional legal requirements on top of the standard fields. If you're billing internationally, check the rules for the buyer's country, not yours.

Country / regionAdditional requirements
United StatesNo federal invoicing standard. Sales tax varies by state — only charge sales tax in states where you have nexus. Include your EIN if requested by the buyer.
European UnionVAT invoices must include both parties' VAT IDs, the VAT rate, and the VAT amount on a separate line. For B2B sales between EU countries, the reverse-charge mechanism may apply — write "Reverse charge — VAT to be accounted for by the recipient" on the invoice.
United KingdomIf you're VAT-registered, include your VAT number and the VAT amount. If you're not VAT-registered, do not show a VAT line at all (don't write "VAT 0%").
CanadaIf you're registered for GST/HST, include your GST/HST number. PST/QST applies in some provinces and must be shown separately from GST.
AustraliaTax invoices over AUD $82.50 must include the words "Tax invoice," your ABN, and the GST amount as a separate line. Below that threshold, a regular invoice is fine.
JapanSince 2023, the qualified invoice system (適格請求書) requires registered businesses to show their registration number for the buyer to claim consumption tax credit.
Latin America (BR, MX, CL, CO)Most Latin American countries require electronic invoicing (NFe in Brazil, CFDI in Mexico) submitted to the tax authority before the invoice is valid. A PDF alone is not legally sufficient.

Frequently asked questions

How do I make an invoice if I'm not a registered business?
Sole traders and individuals can issue invoices using their full legal name and personal address in place of a business name. You don't need to register a company to send an invoice — but in most countries, income from invoices is taxable as self-employment income, so keep records.
How do I create an invoice for free?
The fastest free path is an online invoice generator that produces a PDF without requiring a signup. Word and Excel are also free if you already have them, but they're slower and more error-prone. Avoid "free trial" tools that watermark the PDF or require a credit card.
Can I make an invoice in Word or Excel?
Yes, but neither is built for invoicing. Word looks fine but the math is manual — easy to make rounding or tax errors. Excel handles the math via formulas but the output looks like a spreadsheet, not an invoice. Both are workable for low volume; switch to a generator or accounting software once you're sending more than a handful per month.
What's the difference between an invoice and a receipt?
An invoice is a request for payment (issued before payment). A receipt is proof of payment (issued after). The same transaction often produces both — the invoice when you bill, the receipt when the money arrives.
How do I number my invoices?
Use a sequential, year-prefixed format like INV-2026-0001 and never repeat or skip numbers. Sequential numbering is required by tax authorities in most countries, and it makes your books much easier to audit. If you're switching from a different system, just continue the sequence — don't restart.
Do I have to charge sales tax / VAT / GST on every invoice?
Only if you're registered to collect that tax. Below most countries' VAT/GST thresholds, you don't charge tax at all — and you must NOT show a tax line if you're not registered. If you're unsure, check the threshold for your country and don't add tax until you're required to.
How long after the work should I send the invoice?
Same day or within 24 hours. The longer you wait to invoice, the longer until you get paid — and the harder it gets to remember exactly what you delivered. Build invoicing into the moment a project ships, not the end of the month.
What if the client doesn't pay by the due date?
Send a polite reminder the day after, then again at 7 days, 14 days, and 30 days late. Most late payments resolve on the first nudge. After 30 days, escalate by phone. After 60 days, mention pausing future work. Stay professional — most non-payment is admin oversight, not malice.

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