How to Write an Invoice (With Examples)

How do you write an invoice?

To write an invoice, put your name and contact details at the top, then the client's. Add a unique invoice number and the date. List each item of work with its quantity and price, show the subtotal, tax, and total, and state when payment is due. An app like Voice Invoice builds that same document from you saying it out loud.

That's the whole assignment. An invoice is one page, and it exists to do one job: tell the client exactly what they owe, for what, and by when — clearly enough that they pay it without a phone call. The work is already done; the invoice is just the paperwork catching up.

What should an invoice include?

Eight things, in roughly this order from the top of the page down. The examples are what each one looks like on a real service invoice.

Here's the part most guides won't say plainly: in the US, no federal law dictates what an invoice must contain — there's no required template, no mandatory fields, no government format (GoCardless, "Invoicing requirements in the USA," accessed July 2026). The two real obligations are practical ones: if you charge sales tax, show the rate and amount as a separate line, and keep copies for your records. Everything else on the list is there because it gets you paid faster, not because a regulator wants it.

How to write an invoice, step by step

Here's the same list as a workflow, building a real invoice as it goes — a handyman visit: two and a half hours of work plus the hardware.

1. Start with your details, then the client's. Your name (or business name), phone, email at the top. Then the client: Marisol Vega, 418 Cedar Ct.
2. Add the invoice number and date. This is INV-014, dated July 21, 2026. Next job is INV-015 — sequential, never reused.
3. Write one line per distinct piece of work. "Cabinet door repair and rehang — 2.5 hrs × $85.00/hr — $212.50." The description says what happened; the quantity and rate show the math.
4. Add materials and extras as their own lines. "Hinges and mounting hardware — $46.00." Materials, travel, disposal — billed as lines, not buried in the labor rate, so the client sees what they're paying for.
5. Show subtotal, then tax, then total. Subtotal $258.50. If you charge sales tax, it's a separate line with the rate: Tax (7%) — $18.10. Total: $276.60. (Whether labor is taxable depends on your state — when in doubt, ask your accountant, not your invoice app.)
6. State the terms as a date. "Net 14 — due August 4, 2026." A named date gets paid; a bare "Net 14" makes the client do date math, and some won't.
7. Say how to pay. One line: the payment methods you actually accept, with the details filled in.
8. Export to PDF and send it. PDF, not an editable file — then email or text it the same day the work finished, while the job is fresh for both of you.

Invoice examples

Example 1 — hourly service call with materials

The invoice we just built, as it reads on the page:

• Cabinet door repair and rehang — 2.5 hrs × $85.00/hr — $212.50
• Hinges and mounting hardware — $46.00
• Subtotal $258.50 · Tax (7%) $18.10 · Total $276.60
• Net 14 — due August 4, 2026 · Zelle or check

Example 2 — flat-rate job with a deposit already received

Flat-rate work invoices the agreed price, and any deposit the client already paid shows up as a negative line — money received, subtracted in plain sight:

• Deck pressure wash and stain, materials included — flat rate — $1,150.00
• Deposit received June 30 — −$350.00
• Balance due $800.00
• Due on receipt · Zelle or check

Showing the deposit on the invoice matters: the client sees you counted their money, and the balance line answers the only question they have.

The same invoice, spoken

If you'd rather not type any of this on a phone, voice invoicing builds the document from a description like this:

That's about fifteen seconds of talking, and the arithmetic — the $212.50, the $18.10, the $276.60 — is computed for you. You review every line before anything is sent; if a spoken number is ambiguous, the app flags it for you to confirm rather than guessing.

The same structure carries into trade-specific work. For example, an electrician can capture labor, parts, service-call fees, and payment terms on-site before packing up.

Try it with your own last job — Voice Invoice turns the spoken version into a client-ready PDF in about a minute, free for 3 invoices a month.

Download Voice Invoice on the App Store

What payment terms should you put on an invoice?

For a solo operator: due on receipt, Net 7, or Net 14. Net 30 isn't a law of nature — it's a corporate accounts-payable default, and it means waiting a month for money you earned today. Use it when a bigger client's payment process genuinely requires it; don't offer it by default to a homeowner who could pay you from their phone before you leave the driveway.

See what Net 30 means on an invoice for the calendar-day calculation, early-payment variants, and when shorter terms fit better.

If you charge late fees, the invoice is where the policy has to appear — a fee that shows up for the first time on a reminder isn't enforceable, it's a surprise. One line does it: "1.5% per month on balances past due." Know what that adds up to (1.5% a month is 18% a year) and know that many states cap what you can charge — check your state's rules before you set the number.

Common mistakes

Mistake: Vague line descriptions

"Labor — $340" invites a phone call. "Electrical labor, panel troubleshooting — 2 hrs × $120/hr — $240" plus "Breaker replacement — $100" gets paid. The client should be able to reconstruct the job from the lines. If your work comes in repeatable bundles, standardized packages with named extras make this nearly automatic.

Mistake: A term but no date

"Net 14" alone makes the client compute the deadline. Write the date: "Due August 4, 2026." Ambiguity about when always resolves in favor of later.

Mistake: No numbering scheme

Unnumbered invoices work fine right up until tax time, when "which payments match which jobs" becomes an afternoon of archaeology. INV-001 takes five seconds now. (Yes, everyone's first one is INV-001. The client can't tell.)

Mistake: Forgetting the small charges

Materials, travel time, disposal fees, the second trip for the part — the charges that leak. End every invoice with a deliberate check for extras; across a year, it's often the difference between underbilling and billing what the work cost.

Mistake: Sending an editable file

A Word or Docs file reads as a draft and can be altered by anyone who opens it. Send a PDF. It's the difference between paperwork and a bill.

FAQ

How do I write a simple invoice for the first time?

Put seven things on one page: your name and contact details, the client's, a unique invoice number, the date, line items with quantities and prices, the total (with tax shown separately if you charge it), and when payment is due. That's a complete, professional invoice — nothing else is required.

Can I write an invoice in Word or Google Docs?

Yes — the invoice is valid no matter what made it. But export it to PDF before you send it. An editable file looks unfinished, and you don't want a document about money to be one someone else can change.

What is legally required on an invoice in the US?

There's no federal law that dictates what a US invoice must contain — no required template, fields, or format. The practical requirements come from tax rules (if you charge sales tax, show the rate and amount as a separate line) and from getting paid: a clear total, a due date, and both parties' names.

How do I invoice as a self-employed person without an LLC?

Invoice under your own name. A sole proprietor's legal business name is their own name, so "Chris Alvarez" at the top of the invoice is exactly as valid as "Alvarez Electric LLC." You don't need an LLC, an EIN, or any registration to bill for your work.

What does Net 30 mean on an invoice?

Net 30 means the full amount is due 30 days after the invoice date. Net 15 and Net 60 work the same way, and "due on receipt" means pay now. For solo operators, shorter terms — due on receipt, Net 7, or Net 14 — are normal and reasonable.

How should I number my invoices?

Sequentially, with a short prefix, never reusing a number: INV-001, INV-002, and so on. A year prefix like 2026-014 makes tax time easier. The numbering exists so you and the client can refer to one specific invoice — "the January one" is not a reference.

Can I make an invoice on my iPhone by talking?

Yes. Voice Invoice turns a spoken description of the job — client, line items, prices, terms — into a PDF invoice you review before sending. It takes about a minute, and the free tier covers 3 invoices a month (with a watermark on the PDF).

Next step

Write the invoice for the last job you finished — real client, real numbers, all eight fields. It takes five minutes typed, or about one minute spoken. Either way, the version that exists tonight beats the perfect one that goes out next week.

Prefer the one-minute version? Here's the walkthrough: Create Your First Invoice by Voice on iPhone.

Download Voice Invoice on the App Store