Ottawa's $1.7B Housing Supply Law Funds Ontario's 5% HST Relief on New-Home Purchases

The Act provides $1.7 billion to provinces and territories to help remove barriers to residential construction. The Department of Finance frames the funds as tools — provinces choose how to deploy them, but the eligible uses are explicit: reducing development fees on new homes, enhancing existing provincial and territorial programs that encourage construction, harmonizing regulations to improve internal trade, and lifting productivity in the homebuilding sector. The funding flows through the Provincial and Territorial stream of the Build Communities Strong Fund, which conditions transfers on lowering development charges and not introducing other taxes that hinder housing supply, as outlined in the federal Department of Finance announcement.

That framing matters. The $1.7 billion is not a federal program writing cheques directly to homebuyers. It is a conditional transfer that funds provincial action. Provinces have to commit to fee reductions, cost-match federal contributions where required, and stand up the programs that put the money in motion. Each province's response will look different. Ontario's response — stacking federal-portion HST relief on top of an enhanced provincial rebate — is the first concrete homeowner-facing translation of the policy, and likely the template other provinces will study. When the bill was first tabled in Ottawa earlier this spring, the development-fee conditionality was already the structural pivot. Royal Assent locks it in.

The federal communications position the Act inside a longer arc rather than as a stand-alone tax measure. Finance and National Revenue Minister François-Philippe Champagne and Housing and Infrastructure Minister Gregor Robertson both frame the law as one piece of a broader supply and affordability strategy. The legislative move is one input. Conditioning the money on real fee reductions at the provincial and municipal level is the leverage.

The 13% HST on new homes in Ontario splits into two portions: the federal 5% and the provincial 8%. Under existing rules, the provincial HST New Housing Rebate covers 75% of the provincial portion on the first $400,000 of home value, capped at $24,000. Useful, but modest at today's prices.

The 2026 Ontario Budget enhances that. For agreements that fall within the eligibility window, the temporary program rebates 100% of the 8% provincial portion on eligible new homes valued up to $1 million — a maximum provincial rebate of $80,000. The $80,000 ceiling holds between $1 million and $1.5 million and then phases linearly down to the existing $24,000 cap at $1.85 million, according to the Ontario government's HST backgrounder. The enhanced rebates apply both to the NHR for owner-occupied new homes and to the NRRPR for new residential rental properties.

This builds on a pre-budget move by Ontario and Ottawa to eliminate HST on new-home purchases up to $1 million earlier in the cycle.

The Bill C-26 layer sits on top of that expanded provincial framework. Ontario is using its federal allocation to add relief equal to the full 5% federal portion of the HST, with eligibility tied to the same conditions as the enhanced NHR and NRRPR. The relevant numbers are concrete:

• A new build at $900,000 carries roughly $72,000 in provincial HST and $45,000 in federal HST. Both are rebated under stacked relief, pushing the buyer's total HST burden toward zero.
• A new build at $1.4 million carries roughly $112,000 in provincial HST, capped at the $80,000 maximum, plus a federal-portion contribution that brings combined relief toward the $130,000 ceiling.
• A new build at $1.8 million sits at the high end of the provincial phase-down, where the 8% portion approaches the existing $24,000 minimum and the federal-portion relief scales accordingly.

Ontario estimates the package could stimulate thousands of housing starts, support up to 14,000 construction jobs, and boost real GDP by 0.2 percentage points over the program window. The dollar mechanism on individual purchases and the macroeconomic case are the same case — viewed at different scales.

The provincial documentation is specific about the dates. Eligibility is structured as a series of overlapping windows, and a buyer who clears one but misses another can lose the relief on a purchase that otherwise looks qualifying.

Two practical wrinkles deserve attention.

The first is the assignment rule. Investors and buyers in pre-construction inventory often acquire units through assignment of an earlier purchaser's contract. Under the enhanced rebate framework set out in Ontario's HST eligibility documentation, an assignment qualifies only if both the original purchase agreement and the assignment agreement fall inside the same April 2026 to March 2027 window. An assignment of a 2024 contract picked up in 2026 will not qualify, even if the assignment itself sits within the dates.

The second is the federal regulatory gap. Builders can normally credit existing rebates directly at closing, lowering the cash a buyer needs at the table. That mechanism depends on regulations being in place. While the federal regulations implementing the enhanced rebate are still being finalized, builders may not be able to credit the enhanced provincial NHR at closing. Eligible buyers in that interim period would pay the full HST upfront and then apply to the Canada Revenue Agency after federal regulations and updated CRA forms are released. The relief still lands — just later — and the cash-flow timing on the deposit and closing math changes. Early market data from the prior round of HST changes is instructive: in the months immediately following the enhanced rebate framework taking effect, GTA single-family home sales tripled in April while the condo segment remained dramatically below average, hinting that buyers respond unevenly to tax relief depending on segment.