Pre-Construction Reality

A new build is not a resale with newer paint. The builder's price is only the opening number. On top of it sit federal and provincial taxes on new housing, development levies passed through to you, and rebate rules that hinge on your signing date and your first-time buyer status. Miss any one of them and your closing-day cash can be off by tens of thousands.

This calculator adds the new-build-only costs to the sticker price and shows the real cash needed on closing day. One question, answered properly: after taxes, levies, and rebates, what does this unit actually cost to close?

It deliberately skips the deposit schedule you paid during construction, interim occupancy fees between move-in and final closing, and development charge caps buried in your agreement. It also does not know whether your builder credited the rebate against the price or left you to claim it later. That single detail changes your closing-day cheque enormously, so confirm it with your lawyer.

Your inputs, explained

Purchase price before tax. The base price from your agreement of purchase and sale, before GST or HST. The common error is entering the builder's "all-in" number, which may already include a rebate credit. Check the schedule of adjustments: it separates base price, tax, and any rebate the builder is handling.

Agreement signing date. This date decides which GST rebate you get. The 100% federal rebate applies to agreements signed 20 March 2025 or later (Royal Assent 12 March 2026). Use the date on the first page of your agreement, not your move-in date.

First-time buyer status. The enhanced federal rebate uses the federal 4-year test: neither you nor your spouse owned a home in this or the previous four calendar years. Do not confuse it with Ontario's land transfer test, which is stricter: never having owned anywhere in the world.

Provincial tax treatment. Ontario new housing carries 13% HST (5% federal, 8% provincial). Alberta is 5% GST only. BC is 5% GST plus 7% PST on certain items. Pick correctly, because rebates apply to different portions.

Development levies. The charges the builder passes through, often with a contractual cap. Enter the capped figure from your adjustment schedule. Builders may charge up to the cap, so budget the cap, not a guess below it.

How the math works

Take the base price, multiply by the tax rate, subtract the rebates you qualify for. A $600,000 Ontario base price means $30,000 in federal GST and $48,000 in provincial HST. A qualifying first-time buyer wipes the full $30,000 federal portion through the rebate.

The calculator then adds the non-tax new-build costs: development levies, warranty enrollment fees, and builder administration charges from your adjustments. Then the standard closing costs every buyer pays: legal fees ($1,200–$2,500), title insurance ($300–$600), and land transfer tax.

The blind spot to remember: a rebate the builder credits against your price reduces cash needed at closing. A rebate you claim afterward does not. Same lifetime cost, very different closing day.

Worked example

A first-time buyer in Calgary signs for a new-build townhouse at a $650,000 base price in May 2026.

Step 1: Federal GST. $650,000 × 5% = $32,500.

Step 2: Federal rebate. Price under $1 million, agreement after 20 March 2025, first-time buyer under the 4-year test. Rebate = 100% of GST = $32,500. Net federal tax: $0.

Step 3: Provincial tax. Alberta has no provincial sales tax on the purchase: $0.

Step 4: Registration fees. Alberta charges no land transfer tax. Title transfer: roughly $50 + $5 per $5,000 of value ($650,000 ÷ $5,000 = 130 × $5 = $650, plus $50 = $700). Mortgage registration on a ~$500,000 mortgage: about $550.

Step 5: Standard closing costs. Legal $1,800, title insurance $450, inspection $500.

Step 6: Development levies. Her agreement caps them at $8,000; the builder charges the full cap.

Total cash beyond down payment and mortgage: $700 + $550 + $1,800 + $450 + $500 + $8,000 = $12,000. In Ontario, the same buyer would also face land transfer tax on $650,000 plus 8% PST on any mortgage insurance premium, all in cash.

Provincial quirks and edge cases

Ontario's enhanced new-housing rebate — up to $80,000 of the 8% provincial HST — is in force for agreements signed April 1, 2026 through March 31, 2027 (confirmed on the CRA's Ontario enhanced new housing rebate page). Ontario's 8% sales tax on the CMHC premium is cash on closing and cannot be added to the mortgage.

BC exempts any buyer of a newly built home up to $1.1 million as a principal residence, phasing out by $1.15 million. It is separate from the first-time buyer exemption; claim the larger of the two, never both.

Quebec's welcome tax is billed by the municipality 2–3 months after closing, not through the notary. Budget for it arriving as a separate bill after you have moved in.

Toronto's municipal land transfer brackets steepen above $3 million (4.40% to 8.60% since April 2026), which matters for luxury new builds.

Warning: sell or assign a new build within 365 days and the flipped-property rule taxes the profit as business income at 100% inclusion, with no principal residence exemption, unless a listed life-event exception applies.

Questions to ask a professional

Ask your lawyer: is the GST/HST rebate credited against my price at closing, or do I fund the full tax on closing day and claim it later?
Ask your lawyer: what is the development charge cap in my agreement, and which levies sit outside it?
Ask your mortgage broker: does my lender count the rebate toward my down payment, and is my pre-approval still valid?
Ask a tax professional: do my spouse and I both clear the federal 4-year first-time test?

Frequently asked questions

I signed in 2023 and close in 2026. Do I get the 100% GST rebate?

No. The enhanced rebate needs an agreement signed 20 March 2025 or later. A 2023 agreement falls under the older federal new-housing rebate, capped at $6,300.

The builder says the price "includes HST." Do I still pay the tax?

Indirectly: the builder remits it from the quoted price. What changes your closing cash is whether the builder also credited the rebate against that price. If not, you pay the tax-included price and claim the rebate yourself afterward.

What are occupancy fees?

Between interim occupancy (you move in) and final closing (the building registers), you pay the builder a monthly fee covering interest, taxes, and condo fees. It is not rent and builds no equity. Ask your lawyer for the per-diem figure in your agreement.

Can I claim both BC exemptions on a new build?

No. Take the larger of the new-build exemption and the first-time buyer exemption, not both.

Rules and rates as of September 2026. This is general information for Canadian home buyers and sellers, not financial, legal, or tax advice. Rules and rates change; confirm current figures with your lawyer or notary, your lender, or the government office that administers the tax before relying on them.