Invoicing basics for a one-person trade business
An estimate wins the job. An invoice gets you paid. They're different documents for different moments, and getting invoicing right means you spend less time chasing money and more time earning it.
The difference between an estimate and an invoice
- An estimate is sent before the work. It's a proposal — "here's what I expect the job to cost." The customer hasn't paid yet.
- An invoice is sent after the work (or at agreed milestones). It's a bill — "here's what you owe for the work done." It requests payment.
Many solo trades blur these together. That's a mistake. Sending a clear estimate first sets expectations; sending a clear invoice after removes ambiguity about what's owed.
What every invoice needs
A valid, professional invoice includes:
- An invoice number — for your records and theirs. Sequential makes bookkeeping simple (INV-001, INV-002...).
- The date — when the invoice was issued.
- Your business details — name, contact, how to reach you.
- The customer's details — who's being billed.
- A description of the work — what they're paying for. Match it to the estimate where possible.
- The amount due — itemized if the job had phases, or a clear total.
- Payment terms — when payment is due and how to pay.
- A due date — the single most important field for getting paid on time.
When to send it
The faster you invoice, the faster you get paid. Common patterns:
- On completion — for small jobs. Send the invoice the same day the work finishes, while the job is fresh and the customer is satisfied.
- Milestone-based — for bigger jobs. Invoice a deposit up front (for materials), then at agreed stages (e.g., halfway, on completion).
- Net 15 or Net 30 — giving the customer 15 or 30 days to pay. Common in B2B, but for solo trades serving homeowners, "due on completion" or "due within 7 days" works better.
The key: state the terms clearly on the estimate, before the work starts. No surprises.
How to make payment easy
Friction kills payment speed. The easier you make it to pay, the faster the money arrives.
- Accept cards. Yes, there's a processing fee (this varies — check current rates). But a card payment today beats a check "in the mail" next month. For most solo trades, the fee is worth the speed and certainty.
- Put payment options on the invoice. If you accept card, Zelle, and bank transfer, list all three. Give them a choice; remove the excuse of "I didn't know how to pay."
- Include a link. If you use an online payment tool, a clickable "Pay now" link on the invoice dramatically increases on-time payment.
How to follow up without being awkward
Unpaid invoices happen. A simple, professional follow-up system prevents them from dragging on:
- 3 days after the due date — a friendly reminder email. "Just a note that invoice INV-012 is past due. Let me know if you have any questions."
- 10 days after — a firmer follow-up. Restate the amount, offer to set up a payment plan if needed.
- 30 days after — a final notice. State that further action may be taken.
Most late invoices get paid at step one. The key is to actually follow up — many solo trades are too uncomfortable to ask, and the invoice sits unpaid for months.
Keep good records
For tax purposes (and your own sanity), keep a record of every invoice, whether it was paid, and when. A simple spreadsheet works. Many invoicing tools do this automatically.
This matters because at tax time, your income is what you invoiced and received — not what you vaguely remember. Clean records turn a stressful week into an afternoon.
The amtocsoft way
The estimate builder handles the "before the work" half — a clean, itemized estimate that sets expectations. Pair it with a simple invoicing habit (send promptly, state terms, follow up) and you've closed the loop from quote to cash.