How to write an invoice as a contractor

An invoice is not paperwork. It is a demand for money, and how you write it decides how fast that money arrives — or whether the phone rings first with a question you then spend twenty unpaid minutes answering.

The difference between an invoice that gets paid quietly and one that gets queried is almost never the total. It is the detail underneath it. Here is what goes on the document and, more usefully, what happens when each piece is missing.

1. Your business details, including your licence number

Name, address, phone, email. If your trade is licensed, put the licence number on it — in several states it is a legal requirement on contracts and invoices, and everywhere else it is a free credibility signal that costs you one line.

What happens without it: you look like a guy with a truck rather than a business, and "a guy with a truck" gets paid last, after the utility bill and the credit card.

2. The client's name and the job address — which are often different

The billing name might be a company, a landlord, or a spouse who was not there. The job address is what everyone actually remembers. Put both on it.

What happens without it: on a property manager's desk with eleven other invoices, yours is the one that cannot be matched to a job, so it goes to the bottom of the pile while someone works out what it was for.

3. A sequential invoice number

Not the date. Not a random number. A sequence you keep. It is how you refer to the document on the phone, how your accountant finds it in April, and how you know whether INV-0117 was ever paid.

What happens without it: you cannot chase what you cannot name. "The invoice I sent you last month" is not a document reference, it is an argument.

4. A date, and a real due date

"Due on receipt" is not a due date. It is a wish. Put a calendar date on it: net 14, net 30, whatever you have agreed, expressed as an actual day.

What happens without it: the invoice is never late, because it was never due. You have no moment at which you are entitled to follow up, and you will feel awkward doing it — so you will not.

5. Itemised line items — the field that decides everything

This is the one. If you change nothing else after reading this, change this.

"Bathroom work — $1,900" is a single number, and a single number is a single thing to argue with. The customer has no way to evaluate it except by feel, and their feel is uninformed and probably optimistic.

Now itemise it. Supply and fit vanity unit. Supply and fit mixer tap. Remove and dispose of old suite. Labour, twelve hours. Waste disposal. Suddenly there is nothing to argue with: each line is either right or it is not, and every one of them is right. The total has not changed. The conversation has.

Say what you did in words a homeowner understands, not trade shorthand. "Diagnosed and repaired leaking compression fitting under kitchen sink; replaced supply line and isolation valve; pressure-tested" tells them what they bought. "Fixed leak" tells them nothing and invites them to decide for themselves what it was worth.

6. Labour separated from materials

Show where the money went. It makes the invoice defensible and it makes your markup a normal part of doing business rather than something discovered.

Different trades draw this line differently, and you should draw it the way your trade does — the carpentry and roofing pages go into how each one handles materials, markup and disposal.

7. Subtotal, tax, deposit paid, total due

Show the deposit as a deduction on the face of the invoice. Not in a note. On the maths.

What happens without it: the client sees the full job price on an invoice after they have already given you money, and their first instinct — every time — is that you are double-billing them. Now you are on the phone explaining, and the trust you spent three weeks earning has a dent in it.

8. Payment terms and how to actually pay you

State the terms, the accepted methods, and what happens if it is late. Terms you did not state are terms you do not have: you cannot charge a late fee you never mentioned, and you will not enforce one you feel sheepish about.

And make paying you frictionless. Every extra step between "I should pay this" and "done" is a step at which they get distracted and it slips another week.

9. Send it immediately. This is worth more than everything above.

The value of your work, in a customer's mind, decays. On the day you finish, they can see the new water heater and they are grateful. Three weeks later it is just a thing in their basement that they now have to pay for.

Invoice from the driveway. Not that evening, not Sunday, not "when I catch up on paperwork". If your invoicing takes long enough that you cannot do it on site, that is the problem to fix — and it is exactly the problem a good template or an app that lets you speak the line items is there to solve.

A checklist you can steal

• Business name, address, phone, email, licence number
• Client name and job address
• Sequential invoice number
• Invoice date and a real due date
• Itemised lines, in plain English, naming what you actually did
• Labour separate from materials
• Subtotal, tax, deposit deducted, total due
• Payment terms, accepted methods, late-payment policy
• Sent the same day the work finished

Our free contractor invoice template has all of it laid out already, in PDF and Word, with trade-specific versions. No email required.