BC PST on Professional Services (Oct 1, 2026): What Changes

Effective October 1, 2026, BC PST expands to cover architectural, engineering, and geoscience services, along with security services. For architectural, engineering, and geoscience services, PST applies to only 30% of the purchase price — an effective rate of 2.1% at the standard 7% PST rate — under BC government Notice 2026-001 to providers of professional services. If your firm bills any of these services and has three weeks to get ready, this page covers exactly what changes, how the tax lands on an invoice, and what to do before the date.

What changes on October 1, 2026

BC is widening the professional services caught by PST. The confirmed scope, from Notice 2026-001 and the broader expansion announcement:

• Architectural, engineering, and geoscience services become taxable, with PST charged on 30% of the purchase price rather than the full fee.
• Security services are also being brought into PST from the same date.

This sits alongside the accounting and non-residential real estate services expansion covered in our BC PST rate guide — October 1, 2026 is a single expansion date bringing several service categories into scope at once, not a series of separate changes on separate dates.

Who is caught

If your firm provides architectural services, engineering services, or geoscience services in BC, the new rules apply to you from October 1, 2026, regardless of firm size — there is no carve-out in the confirmed facts for small practices. The same applies to firms providing security services. If you are unsure whether a specific service line you bill falls inside these categories, confirm it directly with the ministry before the date rather than guessing — misclassifying a taxable service as exempt is the kind of error BC can assess retroactively, with penalties and interest, as covered in our BC PST filing and remittance guide.

How the 30% taxable base works on an invoice

The mechanic that trips people up: PST is not charged on the full professional fee. It is charged on 30% of the purchase price, at the standard 7% rate. Worked through line by line on a $10,000 engineering fee:

Two ways to get to the same $210 figure, and both should reconcile: multiply the full $10,000 fee by the effective 2.1% rate directly, or multiply the $3,000 taxable base by the 7% standard rate. If your billing or practice-management system cannot apply a 30%-of-price base natively, configuring it to charge a flat 2.1% PST line item on the full fee produces the identical result and may be the simpler fix — check with your system vendor which approach it supports before the date.

What a firm must do before October 1, 2026

With three weeks to prepare, work through these in order:

1. Confirm PST registration status. If your firm is not already PST-registered, you need to register before your first taxable sale under the new rules. See our BC PST registration guide for the eTaxBC process, timing, and what information you need on hand.
2. Update invoice templates and line items. Add a PST line at the correct effective rate (2.1% for architectural, engineering, and geoscience services), and make sure your PST registration number appears on invoices once you are registered.
3. Configure your billing or practice-management system. Whether your system applies PST to 30% of the fee directly or is configured to charge a flat 2.1% on the full amount, test it against the worked example above before it touches a real client invoice.
4. Review engagement letter and quote wording. Existing quotes and standard engagement letter templates that quote fees without mentioning PST should be updated so new engagements starting on or after October 1, 2026 reflect the tax correctly, and clients are not surprised by a line item that was not in the original quote.
5. Communicate with clients before the first affected invoice. A short note ahead of time — explaining that PST now applies at an effective 2.1% on architectural, engineering, or geoscience fees — costs little and avoids a billing dispute over an invoice that looks different from every prior one.

Work that straddles October 1, 2026

Be careful here: the confirmed facts available do not state a specific transitional rule for engagements that start before October 1, 2026 and are billed after, or vice versa. What is clear is that the outcome depends on some combination of when the service is actually performed and when it is billed — but which of those controls, and whether there is a proration rule for work that spans the date, is not something this guide can state with confidence from the facts verified so far. If you have an engagement that straddles the date, do not assume either the invoice date or the performance date automatically determines taxability — confirm the specific transitional treatment with the ministry or with your accountant before you invoice it.

Related BC PST reading

• BC PST rate guide for 2026 — the full rate picture, including the accounting and non-residential real estate expansion alongside this one.
• How to register for BC PST — registration timing, the small seller exemption, and eTaxBC vs. the FIN 418.
• BC PST filing and remittance — filing frequencies, due dates, and the retroactive assessment risk of misclassifying a taxable service.

To estimate PST on a specific invoice, use our sales tax calculator. For broader BC tax questions, browse our BC tax FAQ.

How RN Canada helps

RN Canada is an accounting and advisory firm with a Vancouver, British Columbia office (head office in Edmonton, Alberta) that helps architectural, engineering, geoscience, and security firms register for PST, configure invoicing and billing systems for the new 2.1% effective rate, and update engagement letters and client communication ahead of October 1, 2026. Our founder, Ozgur Duymaz, holds the CPA (Canada), ACCA (UK), and CMA (US) designations. See our GST, HST, and PST guide or tax return preparation service.