HST on Builder Closing Adjustments in Ontario: What New-Home Buyers Need to Know

Buying a new-construction home in Ontario means arriving at closing with a number that looks nothing like the purchase price on your Agreement of Purchase and Sale. The builder's statement of adjustments can add thousands — sometimes tens of thousands — of dollars to what you owe on closing day. A significant portion of that surprise comes from HST on builder closing adjustments in Ontario, a topic most buyers encounter only when it is too late to negotiate.

Understanding which adjustments attract HST and which do not matters for two reasons. First, it tells you whether the builder is charging tax correctly. Second, it shapes how much of the HST new housing rebate you can actually recover — and whether the rebate has already been built into the purchase price or is yours to claim directly.

This article walks through the most common closing adjustments, maps the taxable versus non-taxable line items, corrects a few persistent myths, and tells you what to look for before you sign off on the builder's numbers.

What Are Closing Adjustments?

When you sign an Agreement of Purchase and Sale with a builder, the purchase price is typically firm — but it does not capture every cost the builder will incur between signing and closing. Builders pass many of those costs through to buyers as closing adjustments: additional charges itemized on the statement of adjustments that you pay (on top of or credited against the purchase price) on closing day.

Common categories include:

• Development charges and levies imposed by the municipality, region, school board, or conservation authority
• Tarion Warranty Program enrolment fees — the mandatory fee to register the home with Ontario's new-home warranty program
• Utility connections and hook-up charges — water, sanitary sewer, hydro, and gas connections to the property
• Common-element costs — in condominium projects, pre-paid amounts for common area maintenance or initial reserve fund contributions
• Hydro, gas, and water meters installed before closing
• Tree-planting, lot grading, or landscaping deposits required by the municipality
• Occupancy charges (in condominiums) for the period between when you take possession and when the condo is registered

Each of these may or may not attract HST. The difference can be a meaningful amount of money.

Which Adjustments Attract HST — and Which Don't

Taxable Adjustments

HST applies to charges that form part of the supply of a new home — in other words, costs the builder passes through that are consideration for the taxable sale itself. As of writing (verify with CRA):

• Development levies and charges passed through to the buyer are generally treated as part of the purchase price of the new home and are subject to HST. The builder collects HST on these amounts.
• Utility connection fees that the builder arranges and bills to the buyer as part of the construction package are typically included in the taxable supply and attract HST.
• Hydro, gas, and water meters supplied by the builder before occupancy are generally taxable.
• Occupancy charges in pre-registration condominiums are taxable supplies — HST applies to the monthly occupancy fee.

Non-Taxable Adjustments

Not everything on the statement of adjustments is taxable:

• Tarion enrolment fees — while Tarion is a mandatory program, the enrolment fee itself is generally treated as a government-mandated fee and is not subject to HST.
• Reserve fund contributions in a condominium — your initial contribution to the condominium's reserve fund is generally not a taxable supply.
• Realty tax adjustments — property tax prorations are not subject to HST.
• Security deposits and damage deposits — these are not payments for a supply and are not taxable (unless forfeited).

The taxable/non-taxable line is not always obvious, and builders do not always draw it correctly. Having a lawyer review the statement of adjustments before closing is the practical safeguard.

Myth vs. Reality: Common Misconceptions

Myth: "HST is already included in my purchase price, so I don't have to worry about it." Reality: Many builder agreements state that HST is "included" in the purchase price — but this typically means the builder has assigned the new housing rebate to itself. It does not mean your closing adjustments are HST-free. HST on adjustments added after signing is often a separate charge, and the rebate assignment may not cover it.

Myth: "The Tarion fee is taxable because it's a builder charge." Reality: The Tarion enrolment fee is a government-mandated warranty fee, not a taxable supply. If your builder is adding HST to the Tarion line, question it.

Myth: "Development levies are just a pass-through, so they aren't taxable." Reality: Because development levies are passed through as part of the overall price of the new home — a taxable supply — they are generally subject to HST. The "pass-through" framing does not strip the tax.

Myth: "My rebate covers all the HST on adjustments." Reality: The new housing rebate has a cap (as of writing — verify with CRA). If adjustments push the total taxable consideration above that cap, you may owe more HST than the rebate offsets.

How the HST Rebate Interacts with Adjustments

Ontario's new housing rebate (combining the federal portion and the Ontario portion) reduces the net HST payable on a new home purchase. The rebate is calculated on the total taxable purchase price — which includes taxable closing adjustments.

In most builder transactions, the builder credits the buyer with the rebate at closing and assigns the right to claim it directly with CRA. That means the rebate is already baked into the closing numbers the builder presents. But it also means the rebate arithmetic depends on the taxable base being correct. If taxable adjustments are understated or overstated, the rebate calculation shifts.

Buyers who do not qualify for the primary-residence rebate (for example, investors) receive no rebate and pay full HST on the entire taxable purchase price — including every taxable adjustment.

Reviewing the Builder's Statement of Adjustments

A closing statement of adjustments is a dense document. Here are the key steps to reviewing it:

1. Obtain the statement early. Builders are required to give you the statement a reasonable time before closing. Ask for it at least two weeks out — do not accept it the day before.
2. Identify every adjustment line. List each charge separately: development levy, Tarion, utilities, meters, deposits, reserve fund, and any builder-specific items.
3. Check which lines include HST. Each taxable line should show the base amount and the HST amount separately. If HST is buried in a lump sum, ask for a breakdown.
4. Verify the Tarion line. Confirm whether HST appears on the Tarion enrolment fee — it generally should not.
5. Reconcile the rebate. Confirm the rebate your lawyer calculated matches what the builder is crediting. The rebate amount depends on the total taxable consideration.
6. Compare against the APS. Your Agreement of Purchase and Sale likely caps the adjustments the builder can charge. Check any cap language against what the builder is claiming.
7. Ask for supporting invoices. For large development levies or connection fees, ask to see the municipality's or utility's invoice — the builder should be passing through the actual charge, not marking it up.

Red Flags to Watch For

• HST charged on Tarion enrolment fees or reserve fund contributions — these are generally not taxable
• Lump-sum "closing costs" with no HST breakdown — you cannot verify the taxable base without a line-by-line breakdown
• Adjustments that exceed the cap in the APS — some agreements limit what builders can charge; a statement that blows past that cap is a negotiating point
• Rebate amount that doesn't match the purchase price — if the rebate looks too small, the taxable base may have been calculated incorrectly
• Late delivery of the statement — a builder who sends the statement the day before closing is limiting your ability to review and push back
• Development levies charged twice — in some projects, levies are paid in stages; a buyer should not be charged for amounts already paid

Frequently asked questions