GST/HST on the sale of a business, and the election that often applies

A surprising number of first-time sellers assume that selling a business is simply outside the scope of GST/HST, on the theory that it is a one-time transaction rather than an ordinary sale of goods or services. That assumption is not reliable, and getting it wrong can leave a seller and a buyer disagreeing, sometimes well after closing, about who owes tax on the deal they thought they had already finished.

Why GST/HST applies at all

The general rule is that a sale of business assets by a GST/HST registrant is a taxable supply like any other, meaning tax can apply to the sale unless a specific exception applies. That default surprises sellers who think of the transaction as selling the business itself, a single conceptual thing, rather than as selling a bundle of individual assets, equipment, inventory, goodwill, each of which carries its own tax treatment under the general rules. Whether a specific asset in the deal is taxable, and at what rate, depends on rules that are detailed enough that a general article cannot responsibly summarize them into a single answer, which is exactly why this is a question for an accountant reviewing the specific asset list, not a rule of thumb applied across every deal.

The election that commonly changes the outcome

Where a business is being sold as a going concern, meaning the buyer is acquiring enough of the business to continue operating it rather than simply buying a few pieces of equipment, the parties can often jointly elect to treat the sale as though no GST/HST applies to the supply. This is a genuine election, not an automatic exemption: both parties generally need to be registrants, the specific conditions need to actually be met, and the election needs to be made and filed correctly, with documentation that supports it. Get any part of that wrong, and the seller can end up on the hook for tax that was never collected from the buyer, which is a considerably worse outcome than simply charging and remitting the tax at closing in the first place.

What tends to go wrong in practice

• Assuming the election applies automatically to any business sale, rather than confirming the specific conditions are actually met for this transaction
• Treating the election as a formality handled at the last minute, rather than as a decision that affects how the purchase agreement itself allocates and prices the assets
• Overlooking that some assets in a deal may not qualify for the same treatment as the rest, particularly where personal-use or non-business assets are bundled into the same transaction
• Failing to keep the paperwork that supports the election, which matters if the Canada Revenue Agency later reviews the filing

Why this belongs in the deal team conversation early

Because the election affects how a purchase agreement structures and prices the transaction, it works best as a question raised while the deal is still being negotiated, not as a line item an accountant discovers needs attention the week before closing. A lawyer drafting the purchase agreement and an accountant reviewing the tax treatment ideally have this conversation together, early, so the agreement itself reflects whichever approach the parties intend to take, rather than being drafted first and adjusted afterward to fit a tax outcome nobody confirmed in time.

Getting the paperwork right, not just the intent

Because the election depends on both parties actually being registrants and on the transaction genuinely qualifying as a supply of a business, or part of a business, as a going concern, a seller cannot assume it applies simply because the deal feels like a going-concern sale in a general sense. The safer sequence is to have an accountant confirm eligibility before the purchase agreement is finalized, then have the agreement itself state clearly whether the election is being made, rather than leaving the tax treatment to be sorted out informally after the fact. A buyer who is not yet registered for GST/HST at the time a deal is being negotiated should also confirm, early, whether registration needs to happen before closing for the election to apply as intended, since arranging that after the fact can be considerably harder than building it into the closing timeline from the outset.