HST on Condo Assignment Sales in Ontario: What Assignors and Assignees Must Know

Selling your spot in a pre-construction condo deal — what's called an assignment sale — can feel like a clean exit strategy. You pocket the difference between your original purchase price and what the new buyer pays, and you walk away before the building even registers. But the Canada Revenue Agency (CRA) takes a close look at that profit, and the question of whether HST applies to the assignment fee on a condo assignment sale Ontario transaction catches many people off guard. Getting this wrong can mean unexpected tax bills, penalties, and interest long after the deal closes.

This article walks through the core HST rules, two common scenarios, who is responsible for remitting tax, and what to include in your assignment agreement.

Why Assignments Create a Separate HST Question

When you buy a pre-construction condo, the builder charges HST on the purchase price — that part is straightforward. An assignment sale, however, creates a second layer. You are not selling the condo itself; you are selling your rights under the Agreement of Purchase and Sale. That is a different transaction, and the Excise Tax Act treats it differently.

The HST question on an assignment turns on two things: why you originally entered the purchase contract, and whether you are considered to be making a taxable supply. The answers are fact-specific, and the same type of deal can produce opposite results depending on your original intent.

Scenario A: The Assignor Always Intended to Resell

Suppose you signed a pre-construction contract with no plan to live in or rent the unit. Your goal from day one was to assign the contract at a profit once the market moved.

In this scenario, CRA's position is that you were engaged in an adventure in the nature of trade — essentially a business activity. The assignment fee (the profit above your original deposit and any upgrades) is taxable, and HST applies to it. Because you were never acquiring the unit for personal use, you also do not qualify for the new housing rebate on the unit itself.

As of writing — verify with CRA — the combined federal and Ontario HST rate is 13%. If HST applies to your assignment fee and you are not registered for HST, you may still be required to remit. Depending on the deal structure, the obligation can fall on you directly rather than being collected through the builder.

This is the highest-risk profile in CRA's eyes. If you have done this more than once, the risk escalates further (see the section on serial assignors below).

Scenario B: The Assignor Originally Planned to Move In

Now suppose you signed a pre-construction contract genuinely intending to occupy the unit as your primary residence. Life changed — a job relocation, a growing family, a financial hardship — and you decided to assign instead.

Here, your original intent matters. If you can demonstrate that you entered the contract for personal use, there is an argument that the assignment fee is not subject to HST, because you were not acting in a commercial capacity. Courts and CRA look at the full picture: what you told the builder at signing, whether you arranged financing as an end-user, whether you applied for the new housing rebate, what your other real estate activity looks like, and any documents that show your plans at the time.

The outcome is not guaranteed. CRA may challenge the personal-use claim if your conduct is inconsistent — for example, if you signed a power of attorney in favour of someone else at closing, or if you had multiple pre-construction contracts at the same time. Documentation of your original intent is the best protection.

Even in this scenario, the new buyer's entitlement to the new housing rebate on the condo itself is unaffected; that flows from the builder's sale, not from the assignment.

Who Collects and Remits HST on the Assignment?

This is where many deals go sideways. The Excise Tax Act places obligations on both builders and assignors, and the assignment agreement must be clear about how HST is handled.

If the builder is party to the assignment (as many are required to be by the original Agreement of Purchase and Sale), the builder may be in a position to collect HST on the assignment fee and remit it. However, builders often disclaim responsibility for the assignor's HST, leaving that obligation with the assignor.

If HST applies and the assignor is not registered for HST, they may still have to remit on a self-assessment basis. The assignee may also face a self-assessment obligation in some circumstances if the assignor did not collect. This creates a situation where both parties assume the other handled it — and neither did.

The safest approach: address HST explicitly in the assignment agreement, confirm registration status, and obtain written confirmation from the builder about their role in the transaction.

What the Assignee (New Buyer) Needs to Know

If you are stepping into someone else's pre-construction contract, your primary HST exposure relates to the new condo itself, not the assignment fee — but you should still understand who is responsible for any HST on the fee you are paying to the assignor.

More practically: your right to the new housing HST rebate on the condo depends on your own intent. You must be acquiring the unit for use as your primary place of residence (or that of a qualifying relative) to claim the rebate. The rebate is typically credited by the builder at closing, as of writing — verify current thresholds and amounts with CRA or an accountant.

Confirm with your lawyer that the assignment agreement properly reflects what is included in the price and how HST is allocated.

CRA Scrutiny: Serial Assignors and Audit Risk

CRA has publicly signalled increased audit activity in the pre-construction market. The agency applies what it calls "badges of trade" — factors that suggest commercial rather than personal intent. Multiple assignments, short holding periods, use of numbered companies, patterns of pre-sale activity, and inconsistency between stated intent and actual conduct all attract attention.

If you have assigned two or more pre-construction contracts, you should assume CRA can identify the pattern through land registry data and builder disclosure. Voluntary compliance — registering for HST, reporting the income, and remitting correctly — is far less costly than a reassessment with gross negligence penalties, which can be a significant percentage of the tax owed. As of writing — verify current penalty rates with CRA.

Checklist: What Your Assignment Agreement Should Address

Before you sign, confirm that the assignment agreement covers the following:

• HST on the assignment fee — state clearly whether the price is inclusive or exclusive of HST and which party remits
• Builder consent — most original agreements require the builder's written consent to assign; obtain and attach it
• Deposit transfer — specify which deposits transfer and any adjustment for interest earned
• Upgrade credits and extras — clarify what the assignee inherits and what, if anything, was negotiated directly with the builder
• New housing rebate assignment — if the assignee will occupy the unit, confirm whether the rebate will be assigned to the builder at closing and on what terms
• Conditions and timelines — occupancy date, registration date, and any builder extension rights that carry forward
• Representations about the original contract — the assignor should warrant that the original agreement is in good standing and disclose any builder notices received
• Indemnity for pre-closing costs — maintenance fees, occupancy fees, and development charge adjustments that arise before title transfers

Frequently asked questions