How to Write Your First Invoice for a Service Job
By InvoicePaw · Updated
Your first invoice needs to tell the customer what you did, what they owe and how to pay. Start with the price you agreed, add the job and contact details, then check the total and due date before sending it. You do not need a complicated design.
Pull together the agreement and job details
Find the quote or messages where you agreed the work and price. If the customer approved a fixed amount, use that amount. If you agreed an hourly rate, work from your time record. The invoice should not introduce a surprise pricing method.
Ask who the invoice should be addressed to and where to email it. A person booking the job may be arranging work for a business or landlord. For a business customer, check whether they need a purchase-order number or a particular billing contact.
Give the customer enough information to recognize the bill
Treat this as a practical checklist, not a universal statement of legal requirements. Tax details depend on your location, registration and customer. For Canadian GST/HST invoices, the CRA source below explains the applicable disclosures.
- Your business name, address and contact details.
- The customer’s name or business name, plus the service address when it differs from the billing address.
- A unique invoice number and the date you issue it. Keep the date of the work in the description or notes.
- Each agreed charge, including quantities or hours and rates where relevant.
- Any applicable tax and registration details, the total, amounts already paid and the remaining balance.
- A specific payment due date, currency and instructions for paying you.
A first invoice for a shelving installation
In this fictional job, Alder Lane Home Repairs installed shelves supplied by the customer. The agreement was three hours at $80 per hour plus $35 for brackets and fixings. The shelves themselves are not charged again.
The labour is $240 and the materials are $35, giving a $275 subtotal. Assume this Ontario supplier is GST/HST registered and the work is taxable at 13%: HST is $35.75 and the total is $310.75 CAD. Nothing has been paid yet, so the amount due is also $310.75.
The job and invoice dates are October 22, 2026. The agreed payment deadline is October 29. These are example prices and dates, not a recommended rate or tax setting for your business.
Alder Lane Home Repairs
Alder Lane Home Repairs Inc.
61 Rowanfield Road
Toronto, ON, M4J 2L8
Canada
+1 416 555 0186
billing@alderlane.example
alderlane.example
Tax ID: 784216395 RT0001
Invoice
#1001
CAD
Bill to
Sam Patel
18 Meadowcrest Avenue
Toronto, ON, M4L 2A6
Canada
+1 416 555 0137
sam@customer.example
Invoice details
- Issue date
- Oct 22, 2026
- Due date
- Oct 29, 2026
- Status
- sent
- Wall-mounted shelving installation - 3 hours$240.00
3 × $80.00
- Agreed wall brackets and fixings$35.00
1 × $35.00
| Description | Qty | Rate | Amount |
|---|---|---|---|
| Wall-mounted shelving installation - 3 hours | 3 | $80.00 | $240.00 |
| Agreed wall brackets and fixings | 1 | $35.00 | $35.00 |
Payment instructions
Send an e-Transfer to billing@alderlane.example and include invoice #1001 as the reference.
Notes
Fictional example, not payable. Shelving installed at 18 Meadowcrest Avenue on October 22, 2026. Customer supplied the shelves.
Terms
Payment is due by the date shown above.
Invoice #1001 / Created with InvoicePaw
This Ontario example assumes a GST/HST-registered supplier and a taxable service subject to 13% HST. Prices, contact details and tax IDs are fictional. Your invoice uses your own details and applicable tax settings.
Write payment instructions someone can actually use
“Please pay promptly” does not tell the customer where to send the money. Name the accepted method, give the correct destination and ask them to include the invoice number as a reference. Make sure the due date matches what you agreed.
For a Canadian e-Transfer, check the receiving email carefully. For other payment methods, use the details you normally provide and avoid including unnecessary sensitive information. State USD or CAD explicitly if the dollar symbol could be ambiguous.
Example text
Payment of $310.75 CAD is due October 29, 2026. Please send an e-Transfer to billing@alderlane.example and use invoice #1001 as the reference. This is fictional example wording, not a payment request.
Check it once, then send a copy and keep one
Read the recipient email, hours, material charges and dates against your original notes. Recalculate the total and confirm that any deposit is recorded only once. Open the finished invoice to make sure the payment instructions are visible.
Keep the issued invoice with the quote, job notes and payment record. The IRS describes keeping business records that support income and expenses; Canadian businesses should follow the CRA’s recordkeeping guidance. An invoice by itself is not proof that the customer has paid.
If you want to create it by text
InvoicePaw can turn the customer, job, amounts and due date into a draft. Review the full preview and describe any corrections before replying YES. Your customer receives the invoice by email and pays using your own instructions; InvoicePaw does not collect their payment.