Estimates vs. invoices for Canadian service businesses
By Clear Bill · Published
An estimate gives your client a clear picture of the work and its proposed price. An invoice tells them what you are billing for, how much to pay and when payment is due under your agreement.
For a service business, the useful connection is the record between those two documents: what the client agreed to, what changed and what the final bill covers. Here is a practical way to keep that record clear.
Estimate or invoice: which do you need?
| Question | Estimate | Invoice |
|---|---|---|
| What is its purpose? | Describe proposed work and pricing for the client to consider. | Request payment for work or a billing milestone covered by your agreement. |
| Which date needs attention? | The issue date and, if used, the date until which the offer is valid. | The issue date and the agreed payment due date. |
| What should the client do next? | Review the scope and confirm the arrangement, or ask for changes. | Check the bill and pay using the agreed method. |
| What should you keep with it? | The agreed scope and any change approvals. | The related estimate, billing details and payment record. |
An estimate's “valid until” date and an invoice's payment due date serve different purposes. A price offer valid until October 20 does not mean payment for the completed work is due on October 20.
An estimate can form part of a customer agreement. The document's title alone does not settle its legal effect. For example, Ontario's consumer guidance describes rules for estimates in consumer contracts and changes to the agreed price. Check the rules that apply to your province, service and type of customer; do not treat an estimate as permission to change the price freely.
Make the proposed work specific
Write the estimate so that another person can understand what is included without reconstructing a phone conversation. For example, “four website pages, up to 500 words per page, with one revision round” is more useful than “website copy.”
Include the client and business details, deliverables, quantities or hours, price basis, currency, applicable taxes and any validity date. Set out exclusions and the agreed approach to extra work in the estimate or an accompanying proposal. Keep the proposal and the client's response together.
Agree on billing timing before the project starts. Will you invoice on completion, at a milestone or according to another arrangement? Put the payment terms in the agreement and make the invoice consistent with them. BDC's invoicing guidance highlights prompt billing and clear payment terms as practical ways to improve the collection process.
A worked example: from CAD1,200 to CAD1,500
This fictional example follows a copywriting project. All amounts below are before applicable taxes.
| Date | What happens | Record to keep |
|---|---|---|
| October 10 | Four pages at CAD300 each: a CAD1,200 estimate, including one revision round. The offer is valid until October 20. | The original estimate and scope. |
| October 18 | The client requests one more page and approves the additional CAD300. The revised scope is five pages for CAD1,500. | The revised estimate or scope confirmation and the client's approval. |
| October 22 | The agreed work is completed and invoiced. The agreement calls for payment 14 days after invoicing. | An invoice for the agreed five pages, with applicable taxes and payment instructions. |
| November 5 | Payment is due under those terms: 14 days after October 22. | The due date on the invoice. Record payment separately when it arrives. |
The extra page explains the CAD300 difference between the first estimate and the final subtotal. The change should be clear to the client before it appears on the bill.
If a sent estimate needs a revision, keep the original and prepare a new version. Identify which version the client approved. Avoid quietly replacing the only record of the earlier proposal.
Review the invoice before sending it
Treat conversion or copying as the start of a draft. Review these details against the agreement:
- Customer and reference: the right person or business, invoice number and any project or purchase-order reference they need.
- Work and quantities: the agreed deliverables or milestone, including approved additions and exclusions.
- Dates: the invoice issue date and payment due date. Do not reuse the estimate's validity date without checking the terms.
- Amounts: unit prices, quantities, currency, applicable taxes and the final total.
- Payment instructions: how to pay and which reference to include so you can match the payment later.
For GST/HST, the CRA's current invoice guidance explains how to show whether tax applies and whether it is included or added separately. Check the tax treatment for your situation; the fictional subtotals above do not determine it. Our Canadian tax guide explains rate selection in more detail.
If you prefer to prepare the bill manually, the free invoice template gives you an editable starting point.
Move from estimate to invoice in Clear Bill
Clear Bill keeps the estimate and resulting invoice connected. Use this sequence for a project you have agreed with your client:
- Open Estimates, then New Estimate. Choose the client, issue date, currency, line items and, if useful, a Valid Until date. Enter a Description, select an appropriate Revenue Category (GIFI) and choose Save Estimate.
- Review and share the estimate with your client for approval. Keep their agreement separately, such as in an email. Conversion in Clear Bill does not capture a signature or prove acceptance.
- If the scope changes after sending, preserve the original and duplicate it or create a revised estimate. Drafts can be edited; sent estimates cannot. Keep the client's approval of the revised work.
- When it is time to bill, open the appropriate estimate. If you need its PDF, download it before converting; the converted estimate remains viewable, but its PDF action is no longer available. Then select Convert to Invoice. Clear Bill creates a new draft invoice using its line items and your configured invoice-number prefix. The original estimate remains available as Converted to Invoice, with a View Invoice link.
- Review the new invoice before sending. Check any due date filled in during conversion against your agreed payment terms.
- Send the reviewed invoice. Record payment against the invoice when you receive it.
Email delivery and PDF downloads require Pro access through a plan or an active trial. Email delivery also requires a verified business email. See current plans and the estimate instructions for the available actions.
Keep the agreement and payment trail together
Retain the original proposal, approved revisions, invoice and payment reference in a project folder or another system you can search. Clear Bill keeps the linked billing documents; keep acceptance and scope-change messages alongside your project records.
Choosing the revenue category while preparing the document also makes that classification easier to review later. Ask your bookkeeper or accountant if you are unsure which GIFI category fits the work. A category selection does not prepare or file a tax return.
When payment arrives, match it to the invoice and record any remaining balance. Our one-month bookkeeping guide walks through matching documents and payments without counting the same transaction twice.
Try this on your next project: create a clear estimate, keep the client's agreement, then convert it into an invoice you have checked before sending. Start with Clear Bill or explore the estimate workflow.