How to make an invoice: a simple step-by-step guide

Making an invoice is mostly about getting a few details right and being consistent every time. This guide walks through exactly what goes on an invoice, the order to build it in, and how to send one in under a minute once you have a system. It works whether you're billing your first client or your fiftieth.

What you need before you start

You don't need accounting software to make a proper invoice. You need three things: your own business details, your client's details, and a clear list of what you're charging for. Have those ready and the rest is just filling in the blanks.

If you invoice regularly, it helps to settle on a format once and reuse it. That keeps your numbering clean and means you're not rebuilding the layout every time you get paid.

How to make an invoice, step by step

1. Add your business details

Start with who the invoice is from. Put your business or your own name, an address or location, an email, and a phone number if clients reach you that way. If you have a logo, add it at the top — it makes the invoice look established and easier to recognize.

2. Add your client's details

Next, who the invoice is going to. Include the client's name or company, and at minimum the email you'll send it to. For larger clients, ask who handles payments — invoices sent to the wrong person are the most common reason they sit unpaid.

3. Give it an invoice number and dates

Every invoice needs a unique number so you and your client can refer to it later. A simple running sequence works best — INV-0001, INV-0002, and so on. The numbers just need to never repeat and to go up over time.

Add two dates: the issue date (when you're sending it) and the due date (when you expect to be paid). "Due on receipt," "Net 7," and "Net 30" are common terms — pick one and state it clearly so there's no guessing.

4. List what you're charging for

This is the heart of the invoice. Add one line for each thing you're billing, with a short description, the quantity or hours, the rate, and the line total. Be specific — "Website homepage design, 6 hours @ $90" reads better and gets questioned less than "design work."

5. Add up the subtotal, tax, and any discount

Total your line items into a subtotal. If you're registered to collect sales tax, VAT, or GST, add it as its own line so the client can see the tax amount separately. If you're giving a discount, show it as a line too, so the math is transparent.

6. Show the total due and how to pay

Make the total amount due the most obvious number on the page. Right below it, tell the client exactly how to pay — bank transfer details, a payment link, or whatever you accept. The easier you make paying, the faster you get paid.

7. Add a short note (optional, but it helps)

A one-line thank-you or a note like "Please reference the invoice number with payment" goes a long way. This is also where you'd mention a late fee policy if you have one.

8. Send it

Save the invoice as a PDF and send it however your client actually reads messages — email, text, or a messaging app. Then record that you've sent it so you can follow up if it goes quiet.

What every invoice must include

Use this as a quick checklist before you hit send:

• Your business name and contact details
• The client's name and contact details
• A unique invoice number
• Issue date and due date
• An itemized list of charges with quantities and rates
• Subtotal, tax (if any), and any discount
• The total amount due
• Payment instructions

Get those eight things right and you have a complete, professional invoice.

Common mistakes to avoid

Reusing or skipping invoice numbers. Duplicate numbers make your records a mess and look careless to clients. Let a sequence handle it.

Vague line items. "Consulting" invites questions; "Consulting call, 2 hours @ $120" doesn't. Specifics get paid faster.

No due date. "Whenever" is not a payment term. A clear due date is the single biggest thing that moves an invoice from "later" to "paid."

Forgetting to follow up. Most late invoices aren't disputes — they're just forgotten. A polite nudge a few days after the due date does most of the work.

The fastest way to make an invoice on your phone

Doing all of this by hand in a document works, but it's slow once you're invoicing every week — you re-type your details, redo the math, and hope you didn't fumble a number. An invoice app handles the numbering, totals, and tax for you and lets you send a clean PDF straight from your phone.

That's exactly why we built Pocket Invoice — a local-first invoice maker for iPhone. You fill in the details once, every invoice is numbered and totaled automatically, and you can export or back up your records any time. Your data lives on your phone and in your own iCloud, not on someone else's servers, so your invoice history is always yours to keep. (If you want the longer story behind that, here's why we built it.)

However you make your next invoice, the formula is the same: your details, their details, a clear list of charges, and an obvious total with a due date. Get those right and you'll get paid.