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GST191 Owner-Built HST Rebate (Ontario): The Form, Worksheet & How to Claim
Ontario | 2026
Owner-built HST/GST rebate
GST191 + worksheet | free download
Part of: Ontario New Home HST Rebate – the full guide & calculator · Bought from a builder instead? See the GST190 form guide.
GST191 Owner-Built HST Rebate (Ontario): The Form, the Worksheet, and How to Claim It
You built your own home in Ontario – or hired the trades and ran it yourself – so nobody handed you a rebate at closing. That is what GST191 is for: it recovers part of the HST you paid on the build. But owner-built rebates have their own rules, their own worksheet, and their own deadline, and the receipts you throw out today are the ones you will wish you had kept. Here is the plain-English version from a 45-year Ontario builder – which forms you file, what you need, and the mistakes that cost owner-builders real money.
1GST191 vs GST190
2The worksheet
3Download the forms
4Owner-built mistakes
Are you actually the “owner-builder”? If a builder built and sold you the home, you file GST190 instead – see the GST190 new housing rebate guide. If you engaged the trades yourself (you were the general), GST191 is your form. For the full picture of the owner-builder path, read Owner-Builder HST Rebate Ontario.
GST191 vs GST190: which one is yours?
| Your situation | Federal form | Ontario portion |
|---|---|---|
| You built it yourself / were your own general Owner-built – you paid the trades and suppliers. | GST191 + GST191-WS | RC7191-ON (Ontario Rebate Schedule) |
| You bought a finished home from a builder | GST190 | RC7190-ON (GST190 guide) |
The GST191 set has three parts: the GST191 application, the GST191-WS construction summary worksheet (where you total your build costs and the HST you paid), and the Ontario rebate schedule (RC7191-ON) for the provincial portion. You file all three together.
Download the owner-built forms
GST191 owner-built rebate formsFillable PDFs. Confirm you have the latest CRA version before you submit.
GST191 – New Housing Rebate (owner-built)The main application for a home you built yourself.
Download GST191 ↓GST191-WS Construction Summary WorksheetTotal your build costs and the HST paid – fill this first.
Download worksheet ↓Ontario Rebate Schedule (RC7191-ON)Claims the provincial portion – files with GST191.
Download Ontario schedule ↓Hosted here for convenience. CRA updates these periodically – cross-check the version against canada.ca before filing. Not owner-built? Grab the GST190 forms instead.
What owner-builders need before filing
- Every invoice showing HST – materials, subtrades, equipment. The worksheet totals these; no receipt means no claim on that line.
- The fair market value of the finished home (house + land) at substantial completion – this drives eligibility and the amount.
- Your occupancy / substantial-completion date – the filing clock runs from here.
- Proof it is a primary residence for you or a relation – not a rental or a flip (a different rebate covers new rentals).
- Land documentation if you bought the lot separately – it factors into the value.
The mistakes that cost owner-builders the rebate
- Tossing receipts. This is the big one. Owner-built rebates are built from your invoices – keep every single one from day one.
- Missing the deadline. The owner-built claim has a filing window from substantial completion / occupancy. Late is denied.
- Skipping the Ontario schedule. The provincial portion is usually the larger cheque – don’t file federal-only.
- Guessing fair market value. Too high or too low both cause CRA problems; be realistic and documentable.
- Claiming ineligible costs. Your own labour isn’t claimable; some soft costs aren’t either. The worksheet keeps you honest.
- Filing GST190 by mistake. That form is for homes bought from a builder – owner-built is GST191.
See your number before you file
The forms tell you how to claim; this shows how much – and whether the enhanced rebate applies to your build. Slide your build value:
Ontario HST Rebate | Deadline April 1, 2027
You Could Lose Up To $106,000 If You Don’t Start Before April 2027
Ontario’s enhanced HST rebate puts up to $130,000 back in an owner-builder’s pocket – but only if your build contract is signed before April 1, 2027. Miss that window and you fall back to the standard $24,000 rebate. On a typical build, that is a six-figure swing.
$0
Contract signed before Apr 1, 2027
$24,000
Signed after the deadline
$900,000
Miss the deadline and you forfeit
$0
Estimate based on Ontario’s 2026 enhanced HST rebate (Bill 114). Final eligibility for an owner-built home is confirmed by a licensed rebate specialist – that’s what the free check is for. Full HST rebate details
The enhanced HST rebate applies to new home construction; final eligibility is confirmed by a licensed rebate specialist. Use the HST rebate calculator to check your number before filing.
Not sure your owner-built claim is right - or how much you qualify for?
Building in Simcoe County or Georgian Bay? We have guided owner-builders through the rebate for 45 years. Free eligibility check - we confirm your form, your number, and your deadline. Call 705-533-1633.
Related rebate & build guides
- GST190 (bought from a builder) - the other new-housing rebate form.
- New Home HST Rebate Calculator - see your number in 30 seconds.
- Owner-Builder HST Rebate Ontario - the full owner-built guide.
- Owner-Builder Ontario - what you can (and can't) do yourself.
- Cost to Build a House in Ontario - where the rebate fits the budget.
Frequently asked questions
What is the GST191 form for?
GST191 is the GST/HST New Housing Rebate application for owner-built homes in Ontario - homes you built yourself or had built while acting as your own general contractor. It recovers part of the HST you paid on materials and subtrades. If a builder built and sold you the home, you file GST190 instead.
What is the GST191-WS worksheet?
GST191-WS is the construction summary worksheet. You list your build costs and the HST paid on each, and it totals the amounts that flow onto the GST191 application. Fill the worksheet first - it's where the rebate figure actually comes from, and it's why keeping every invoice matters.
How long do I have to file an owner-built rebate?
The owner-built claim has a filing window that runs from when the home is substantially complete or first occupied. Miss it and the claim is denied, so don't leave it until tax season - and note the enhanced rebate is separately tied to when your build contract is signed.
Can I claim the HST on my own labour?
No. You can claim the HST you actually paid on materials, subtrades, and services - but your own labour isn't a taxable purchase, so there's no HST on it to recover. The worksheet is structured around the costs that do qualify.
Do I need the Ontario schedule too?
Yes. The Ontario rebate schedule (RC7191-ON) claims the provincial portion, which is usually the larger part of the rebate. Filing the federal GST191 alone leaves money on the table - download the Ontario schedule with it above.
What records do I need for an owner-built rebate?
Every invoice and receipt showing the HST you paid, plus the fair market value of the finished home at completion. Keep them organized from day one - CRA can ask for them, and reconstructing a year of receipts at the end is the biggest headache owner-builders face.
Can you help me file it?
Yes. A licensed rebate specialist can confirm your form, your amount, and your deadline for free. Use the eligibility check on this page, or book a call with our team in Simcoe County and Georgian Bay.
Note: general guidance, not tax advice - CRA forms and rebate amounts change. Confirm the current form at canada.ca and your eligibility with a licensed rebate specialist before filing.
