HST on Commercial Property: Why You May Pay Zero Cash at Closing — If You Do One Thing Right
Residential buyers are used to "HST is already baked into the price." Commercial deals throw them: is the 13% added on top, paid in cash at closing? In fact, a buyer registered for HST usually pays no HST cash at closing at all, via the self-assessment mechanism.
Do I have to pay 13% HST when buying commercial property?
Yes — but how you pay, and whether cash actually leaves your hands, depends on whether you’re GST/HST registered. Per CRA (Canada.ca GST/HST Memorandum 19-4-1), commercial real estate sales carry 13% HST. If the buyer is a registrant and will use the property primarily (>50%) in commercial activity, the self-assessment mechanism applies: you report the tax and claim an equal input tax credit (ITC) on your own GST/HST return, netting to zero — no HST cash at closing. Non-registrants, or buyers not using it primarily for commercial activity, remit directly to CRA via form GST60.
Source: Canada.ca CRA GST/HST Memorandum 19-4-1 (Commercial Real Property, 2026)
I’m Arthur Zhao. Nothing raises a commercial buyer’s heart rate — or gets mangled by inexperienced agents — like HST. Residential buyers are used to tax being included in the price, so when a commercial contract says “price plus HST,” their first reaction is that they’ll hand over an extra 13% cash at closing — $390K on a $3M building. The truth: if you’re HST-registered and using the property primarily for business, in most cases the self-assessment mechanism means zero HST cash changes hands at closing. Getting this step wrong ties up hundreds of thousands in cash for nothing.
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First question: is the deal even taxable?
Second question: are you HST-registered?
How self-assessment actually works
⚠️Whether the standard OREA commercial contract states the price as “plus HST (in addition to)” or “HST included” is a clause worth 13%. Read it the wrong way and a $3M building is off by $390K. Before signing a commercial offer, confirm the exact HST wording and entity eligibility with your lawyer, word by word.
The "primarily commercial" line: >50%
💡 The core line: registered + primarily commercial use = zero HST cash outflow at closing (self-assess and offset). Not registered = pay the full 13% in cash at closing, then see whether you can recover it. Deciding which entity buys and whether to register for HST first can be worth hundreds of thousands in cash flow — it’s the first thing to settle with your accountant before buying, not after.
Non-registrants: form GST60 + cash remittance
ℹ️This is a general overview, not tax advice. Every commercial deal’s HST treatment turns on the specific entity, use percentage, and deal structure. Consult your accountant and real estate lawyer before buying, and settle the entity and registration status before the offer goes in.
Frequently Asked Questions
Do I really have to pay 13% cash at closing?
In most cases, no — as long as you’re a GST/HST registrant using the property primarily (>50%) in commercial activity, self-assessment lets you report and offset the tax on your return, with zero HST cash outflow at closing. The cases that require actual cash are non-registrant buyers or non-primarily-commercial use (remitting to CRA via form GST60).
What is an input tax credit (ITC)?
An ITC is how a registered business recovers GST/HST it paid or self-assessed on its commercial activities. When you self-assess the HST on a commercial purchase, you can claim an equal ITC because the property is used commercially — and it’s that credit that makes the net cash outflow of self-assessment zero. How much you can claim depends on the property’s commercial-use share.
How is HST handled on mixed-use property (retail below, residential above)?
It’s split by actual use: the commercial portion can generally be self-assessed with an ITC claimed, while the residential portion follows different treatment (new residential may trigger its own HST rules; used owner-occupied residential is generally exempt). Mixed-use HST is complex — have your accountant compute it portion by portion rather than applying one blanket ratio.
Should I register for HST before buying?
Usually yes, and often it’s best to hold the property through a registered corporate entity — that’s what secures self-assessment eligibility and avoids fronting 13% in cash at closing. Which entity and when to register is the first thing to settle with your accountant before buying, not something to fix after closing.
Arthur Zhao
Real Estate Broker · FRI · ABR · SRS · PSA · MCNE · E-PRO · CLHMS & GUILD Elite · REAIS
VP & Branch Manager, Bay Street Group Inc.
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