Ontario • Custom Builds • Financing • HST • 2026
Construction Financing in Ontario: HST Rebates, Draw Schedules, and the Traps Nobody Warns You About
Here’s the number that stops most people cold: every new home built in Ontario comes with a 13% HST bill.
And most homeowners don’t realize there’s money coming back — sometimes about $24,000, sometimes significantly more if you qualify for special programs.
But the HST is only the appetizer. The construction financing process itself has built-in friction points that surprise almost every first-time custom home client:
draw delays that freeze your site, holdback rules that changed in 2026, appraisal and legal fees that appear at every milestone, and “budget gaps” your bank brochure never mentions.
This page is the honest version — from a builder who has watched these issues derail good projects for good people.
Start with the big number: total build cost.
Before you even talk to your bank, you need a realistic ballpark of the total project — not just the “builder contract number,” but the real all-in number that financing will live and die on. Use this to start the conversation properly: get a ballpark on your total build cost before the financing conversation.
Most builder websites don’t explain construction financing in plain language. Not because it’s secret — but because it’s messy, it’s bank-dependent, and it forces uncomfortable conversations early.
This post covers: how HST and rebates really work, how construction draws really work, the hidden costs inside the draw process, and the 2026 holdback changes that every custom homeowner should understand.
A smooth custom build is mostly planning, timing, and clarity. The financing system is what it is — but once you understand the pressure points, you can plan around them.
HST on a New Home in Ontario — What You’re Actually Paying and What Comes Back
The Tax Most People Don’t Budget For — and the Rebate Most People Don’t Claim Properly
Let’s make this real. Ontario HST is 13% (5% federal + 8% provincial). On a $900,000 custom build, that’s $117,000 in HST before rebates. On a $1.2 million build, it’s $156,000. Most people do not have that number mentally sitting inside their “home budget,” and it should be.
1) The standard Ontario new housing rebate (the “$24,000” people hear about)
Ontario has a provincial new housing rebate that can be available up to $24,000. In practice, this is the rebate most builders assume will be assigned/credited in the contract. It’s common, it’s legal, and it’s normal — but you need to know how it’s being handled in your paperwork.
There are two typical ways it’s done: (a) the builder credits the rebate against the price at closing (meaning the builder claims it), or (b) the homeowner applies for the rebate after closing. Both can be valid — what matters is that you don’t assume one when your contract does the other.
2) The federal portion (why many custom homes don’t qualify)
The federal new housing rebate is more restricted and phases out at higher values. For many custom builds in Simcoe County, the home value is above the federal threshold, so you may not receive the federal portion. That’s not “unfair,” it’s just how the program is structured — and it’s why I’m not going to pretend every reader gets the same rebate.
3) 2026 first-time buyer relief (big potential, but verify before relying on it)
You may be seeing headlines about first-time buyer tax relief on new homes. Here’s the honest way to think about it in early 2026: there are federal and Ontario measures that have been publicly described, and they can be meaningful — but you should treat them as potential upside until your lawyer confirms the current status and your eligibility for your exact situation.
Use rebates as a bonus when they’re confirmed — not as a guarantee when you’re qualifying for a mortgage. The date your agreement is signed, when construction begins, and how the home will be occupied can all matter.
4) The builder rebate assignment trap (this is the one that causes arguments)
In Ontario, it is common for builders to have the rebate assigned to them and factor it into pricing. That’s not shady — it’s standard. The problem is when the homeowner doesn’t understand the assignment, or when the homeowner might be eligible for additional relief and the contract language doesn’t clearly say who benefits from it.
The lesson is simple: read every clause related to HST before you sign. Ask your lawyer to explain it in plain English, including: who is claiming which rebate, what happens if eligibility changes, and what the net price is after all assignments.
How Construction Loans Actually Work in Ontario
What Your Bank Told You vs. What Actually Happens on Site
Most Ontario construction mortgages release funds in stages (draws) tied to build milestones. A common structure is five draws, roughly: foundation, framing/roof, mechanical rough-in + insulation, drywall/interiors, and final completion.
On paper, that sounds reasonable. In the real world, the draw process usually includes: a site inspection by an appraiser, paperwork, lien checks, legal confirmations, and internal bank processing. That means the moment you “hit a milestone,” you do not automatically get a cheque the next day.
What happens at each draw milestone
- Appraisal/inspection: the lender’s appraiser confirms the stage is complete (and you pay the appraisal fee).
- Lien checks: the lender wants confidence the property won’t be hit with liens.
- Legal confirmation: your lawyer may be involved at each draw (and yes, there are fees).
- Bank processing: even after everything is “submitted,” banks have timelines and queues.
Trades need to be paid. Materials need to be paid. Payroll doesn’t wait for a bank’s internal approvals. If a draw takes three to six weeks, and the builder is expected to keep pushing forward anyway, what’s really being asked is: “Can you carry my project financially while my bank catches up?” Most builders can’t — and they shouldn’t.
This is where relationship damage happens. Homeowners think the builder “slowed down.” Builders feel like they’re being asked to be the bank. Neither party is wrong — the system creates friction. The fix is proactive planning and clear expectations from day one.
Ontario Holdback Rules — What Changed in 2026
A change that affects cash flow, timelines, and paperwork
Ontario law requires a 10% statutory holdback to protect owners from liens if trades aren’t paid. In plain English: a portion of payments is withheld until the lien period is dealt with. On a big custom project, that holdback can be a very real chunk of money sitting in the system.
The big change effective January 1, 2026 is that Ontario moved to a framework where annual holdback release becomes mandatory for longer contracts, with specific notice and timing requirements. In general terms: owners must publish a notice within a prescribed window after the contract anniversary, and then release accrued holdback within a set day range — assuming no liens are preserved/perfected.
If your contract crosses the dates where transition rules apply, or your project runs longer than a year (many custom builds do), the holdback schedule isn’t “a vibe,” it’s a compliance item. Have your construction lawyer confirm how the 2026 framework applies to your contract date and your project timeline.
How to Structure Your Build to Avoid the Biggest Financing Problems
What the clients who have the smoothest builds do differently
1) Get your lender’s milestone definitions in writing
“Framing complete” means one thing to a builder and another thing to a bank. Misaligned definitions are a common reason draws get delayed. Ask your lender for their draw milestone checklist and make sure your builder’s schedule aligns to it.
2) Budget the “between-draw” costs up front
Appraisals, draw-stage legal work, and construction-loan interest aren’t surprises if you plan for them. Put them in the budget as real line items — not “misc.”
3) Know exactly who is claiming your HST rebate
Before you sign: have your lawyer explain the HST clause. Confirm who claims what, what happens if eligibility changes, and whether any additional first-time buyer relief (if applicable) is captured by you or assigned in the contract.
4) Choose a builder who has lived through construction draws
A builder who has managed draw-financed custom builds knows how to plan the sequence, request appraisals early, and communicate the reality. Ask any builder you’re interviewing: How many draw-financed builds have you managed, and how do you handle the gap between milestone completion and funds landing?
A Note on Mortgage Brokers and Your Bank
What we can help with — and what you need your own advisor for
We’re builders — not mortgage brokers, not lawyers, and not tax advisors. Most of our clients come with their own lender relationship or a broker who understands construction products, and that’s the right approach. Construction mortgage terms vary widely by lender, and a broker who specializes in construction can help you compare apples to apples.
Where we can help: explaining your construction schedule clearly so appraisal timing can be planned, clarifying milestone definitions so draws don’t get stuck, and making sure your project timeline and draw timeline aren’t fighting each other.
Where you need a professional: mortgage product recommendations, legal advice on HST clauses/holdbacks, and tax advice on rebate eligibility. Get your lawyer and broker involved early — not after the shovel goes in the ground.
Common Questions About Construction Financing and HST in Ontario
How much HST do you pay on a new home in Ontario? +
Ontario HST is 13% (5% federal + 8% provincial). On a $900,000 build that’s $117,000 before rebates; on a $1.2M build it’s $156,000. The important part is budgeting the real number early, then confirming what rebates your contract assumes and who is claiming them.
What is the HST rebate on a new home in Ontario? +
Ontario has a provincial new housing rebate up to $24,000 in many eligible situations. The federal rebate is more restricted and phases out at higher values, so many custom homes won’t qualify for the federal portion. If you’re a first-time buyer, there may be additional relief programs depending on current rules and timing — confirm those with your lawyer before relying on them in financing.
Can a builder claim the HST rebate instead of the homeowner? +
Yes — and it’s standard. Many contracts have the rebate assigned to the builder and credited in the purchase price. The key is clarity: your agreement should say who is claiming what rebate and what happens if eligibility is different than expected. Don’t assume you can claim a rebate if the contract already assigned it.
How many draw stages does a construction mortgage have in Ontario? +
Often five: foundation, framing/roof, mechanical rough-in + insulation, interior/drywall stage, and final completion. Each draw typically involves an appraisal/inspection and lender processing before funds are released.
Why does construction stop between draw payments? +
Because draw funding is not instant. Appraisals, lien searches, legal confirmations, and bank processing can take weeks. Builders still have trades, materials, and payroll to pay in real time. If the draw money hasn’t landed, work often pauses — not out of stubbornness, but out of cash-flow reality.
What changed about Ontario construction holdback in 2026? +
Ontario’s Construction Act amendments effective January 1, 2026 introduced a mandatory annual holdback release framework with specific notice and release timing. Transition rules apply based on when the contract was signed. This is a “talk to your construction lawyer” item because compliance matters and timelines are strict.
When do development charges get paid on a custom build? +
Typically at building permit issuance — not at closing and not when you move in. They vary by municipality and can change. Get the current schedule for your township/city early and make sure it’s included in the financing plan.
Walk Into the Financing Conversation Prepared
The smoothest custom home builds aren’t the ones with “no problems” — they’re the ones where the homeowners understood the financing mechanics before they started. If you want to avoid the classic draw delays, HST confusion, and budget gaps, plan for them up front and get your advisors in place early.
If you’re planning a custom build and you want a realistic budget conversation before the bank starts asking questions, start here: Cost Calculator. If you’d like to talk through timeline, scope, and how the draw schedule will interact with the build sequence, reach out early — that’s when we can actually prevent problems.
