Introduction
Most incorporated professionals use foreign digital services — cloud storage, project management platforms, video conferencing tools, design software, accounting software — that are billed in USD from US or international companies. The HST implications of these purchases are not widely understood, and the compliance obligation may fall on the Canadian corporation — not the foreign provider.
The General Rule: HST on Imported Services
When a Canadian corporation purchases a service from a foreign (non-resident) provider who is not registered for Canadian HST, the Canadian corporation may have a self-assessment obligation under the reverse-charge mechanism — effectively, the corporation is required to calculate and remit the HST that would have applied if a Canadian provider had supplied the same service.
This rule applies to "imported taxable services" — services acquired from non-residents that are not HST-exempt and are used in the course of the corporation's commercial activities (its business operations).
The Simplified Registration Regime for Foreign Suppliers
The CRA implemented a simplified HST registration regime requiring non-resident digital service providers — large platforms like Adobe, Zoom, AWS, Microsoft, Slack, and others — to register for HST and charge it directly to Canadian customers above a certain revenue threshold. Many major platforms now charge 13% HST automatically on invoices to Ontario-registered corporations.
For these platforms that have registered under the simplified regime, the HST is collected by the platform and remitted by the platform — the Canadian corporation pays HST on the invoice and claims an ITC, just like any domestic purchase.
When the Obligation Falls on the Corporation
Where the foreign provider is not registered under the simplified regime — smaller or less common platforms — the Canadian corporation has a self-assessment obligation:
The corporation calculates HST at 13% on the amount paid to the foreign provider.
It reports this as HST collected (a liability) on its HST return.
It simultaneously claims an ITC for the same amount (assuming the service was used in commercial activities and the corporation is a full ITC claimant).
For a full ITC registrant with no exempt activities, the net effect is zero — the self-assessed HST is both a liability and a credit, netting to nil.
When the Self-Assessment Creates a Real Cost
For a professional whose corporation has exempt activities — a medical clinic, a dental practice, a law firm providing some exempt services — the ITC claim for imported services may be restricted. The partially exempt corporation can only claim ITCs in proportion to its taxable activities. If 40% of the clinic's activities are exempt, only 60% of the imported service HST can be claimed as an ITC.
The remaining 40% — HST self-assessed but not ITC-claimable — is an HST cost to the corporation. This is often overlooked by partially exempt practices purchasing foreign digital services.
Practical Steps
For a fully taxable practice (law firm, architecture firm, engineering firm): Confirm whether major foreign platforms are charging HST on invoices. For those that are, claim the ITC normally. For those that are not, self-assess on those amounts and claim the full ITC.
For a partially exempt practice (medical clinic, dental practice): Quantify the imported digital services not subject to HST collection by the platform, self-assess the applicable HST, and claim the restricted ITC based on the taxable activity percentage.
When to Speak With a CPA
For any professional corporation that purchases significant foreign digital services — above $10,000 annually — a review of the HST treatment of those purchases, the platform's registration status, and the ITC claim entitlement is worthwhile. The partially exempt practice faces a real cost from getting this wrong.
Rotaru CPA advises professional corporations on HST obligations for digital service purchases. Book a consultation to review your corporation's imported service HST position.