Sep 17, 2026 · 2 min read
How to Make an Invoice: A Simple Step-by-Step Guide
An invoice only needs to do two things: tell the client exactly what they're paying for, and make it easy for them to pay you. Everything below builds toward that.
1. Start with who's who
Put your details and the client's details at the top, clearly separated. At minimum:
- Your name or business name, and an email or phone number
- The client's name (and business name, if it's a business)
- The invoice date and a due date
If you invoice the same client more than once, keep this consistent invoice to invoice. It's the first thing anyone checks when an invoice lands in their inbox.
2. Give the invoice a number
"INV-001" is enough. The number matters less than having one at all: it's what you and the client both reference if there's a question later, and it's what makes your own records searchable once you've sent more than a handful.
3. List what you're billing for
One line per item or service, with:
- Description: specific enough that the client remembers what it was for without asking. "Website homepage redesign" beats "design work."
- Quantity: hours, units, or just 1 for a flat fee.
- Unit price: the rate per item or hour.
- Line total: quantity times unit price, calculated for you if you're using a generator.
4. Add tax if it applies
Whether you charge tax depends on where you and your client are and what you're selling, not on the invoice itself. If you do charge it, show the rate and the tax amount as their own line, above the total, not folded into the unit prices.
5. Total it up
Subtotal, tax, total. In that order, with the total visually heavier than everything above it, since it's the one number the client actually needs to act on.
6. Say how and when to pay
An invoice without payment terms just sits there. Include:
- A due date, or "due on receipt" if you expect same-day payment
- How you accept payment (bank transfer details, a payment link, etc.)
Template, spreadsheet, or invoice maker?
All three produce a valid invoice. The difference is what happens on invoice #2:
- A Word or Excel template you fill in and export to PDF each time. Fine at low volume, but you're retyping client details every time unless you keep separate copies per client.
- A spreadsheet handles the math for you but still needs manual formatting to look like an actual invoice rather than a table of numbers.
- An invoice maker remembers your client list and your own details, so entering a new invoice is mostly picking a client and adding line items.
Invoqify's invoice maker covers all six steps above automatically, calculates totals as you type, and exports straight to PDF. The first one's free, no account needed.