How GST/HST and provincial sales tax change Canadian ductwork quotes

What to take away

How GST or HST lands on a ductwork quote

Ductwork is a taxable supply. Install, replace, seal or clean it for a homeowner or a builder, and you charge GST or HST on the whole invoice, labour and material together. Residential ductwork has no exemption.

The rate follows the job site. A Calgary contractor installing ductwork in Ontario charges Ontario HST. A Quebec contractor working in New Brunswick charges the New Brunswick rate.

The Canada Revenue Agency administers the federal framework, and the starting point for rates, registration and filing is the federal hub at Taxes - Canada.ca.

Zero-rated supplies exist. Exports of goods, certain farm equipment and some international services sit at zero per cent. A ductwork install inside Canada does not qualify.

That split shows up hardest when you buy material. In a participating province you pay HST on sheet metal and recover it as one credit. In a separate-tax province you pay GST plus a provincial tax that may never come back.

Decide before you quote whether your number includes tax. Contractors who quote a tax-inclusive total and then add GST at invoicing get accused of bait pricing, and homeowners push back hard.

The labour and material logic underneath that number is covered in how to price hvac contractor services.

Registering your HVAC business for GST/HST

You must register once taxable revenue from all sources passes the small supplier threshold. The threshold is 30,000 dollars in revenue over four consecutive calendar quarters. Revenue counts before expenses, so one strong ductwork season can push you over.

Registration is not automatic. You apply for a business number with a GST/HST account and receive a nine-digit number with the RT0001 program identifier. That number goes on every quote and invoice.

Voluntary registration below the threshold makes sense when you buy heavy material and want credits now. It also obliges you to charge and remit tax on every taxable sale.

Sole proprietors, partnerships and corporations register the same way. The account belongs to the business entity, so a change of ownership needs a new registration.

The obligations that arrive with registration, filing, remitting, keeping records and correcting errors, are set out at Business taxes - Canada.ca.

Registration is one line on a longer start-up list that includes workers' compensation coverage and gas fitting permits. Our hvac contractor compliance checklist covers the rest.

Once registered you cannot pick which jobs to tax. Every taxable ductwork supply gets tax, cash jobs included. Skipping tax on a cash job is the shortest route to a reassessment.

Keep the registration certificate where you can find it. Builders and property managers ask for it before they issue a purchase order, and a missing number stalls payment.

Input tax credits on ductwork materials and subcontractors

An input tax credit is the GST or HST you paid on business purchases, recovered against the tax you collected. On a residential ductwork job material is often a third of the invoice, so the credit is real money.

Eligible purchases include sheet metal, spiral and flex duct, insulation, sealants, registers and grilles. Fasteners, filters, van fuel, tools and equipment used in the business qualify too.

Subcontractor invoices qualify. Hire a sheet metal crew or a balancing specialist, and the tax they charge you is recoverable, provided they are registered and show the tax separately.

Some purchases are excluded: personal items, entertainment under the limited rules, and a passenger vehicle above the capital cost ceiling. Keep personal and business spending in separate accounts and the argument never starts.

Timing depends on your accounting method. Cash-basis contractors claim the credit in the period they pay the supplier. Accrual filers claim against the invoice date.

If a customer does not pay you, you still remit the tax you charged. That gap is why receivables discipline belongs in your books. The equipment and cash flow side sits in hvac contractor equipment.

Bad debt relief exists. Write an invoice off as uncollectible and you can recover the tax portion through a bad debt adjustment, after reasonable collection efforts and inside the time limits.

Provincial sales tax: Ontario HST, BC PST, Quebec QST

Ontario charges 13 per cent HST, federal and provincial portions combined. A quote to an Ontario homeowner shows one tax line, and you remit the whole amount on your GST/HST return. Ontario's treatment of goods and services is described at Harmonized Sales Tax | ontario.ca.

British Columbia charges 5 per cent GST plus 7 per cent PST. PST is a retail sales tax, not a value-added tax, so the PST you pay on materials is generally not recoverable. That lifts your real material cost by roughly the PST rate.

Quebec charges 5 per cent GST plus QST at 9.975 per cent, and Revenu Québec administers the QST. Quebec sets its own registration threshold at 30,000 dollars in taxable supplies over four consecutive calendar quarters.

The province's tax administration, including how QST applies to construction and renovation contracts, is outlined at Finance, income and other taxes | Gouvernement du Québec. QST on your purchases comes back through the Quebec system, not the federal one.

Manitoba charges GST plus 7 per cent RST on materials, with limited recovery. Buy ductwork components there and install them elsewhere, and you need to know where the tax was paid.

Saskatchewan charges GST plus 6 per cent PST, and some construction contracts are treated as purchases of tangible personal property, which shifts who pays.

Alberta, the Northwest Territories, Nunavut and Yukon charge GST only. Alberta is the simplest jurisdiction to quote in and often the cheapest place to buy material.

Nova Scotia, New Brunswick, Newfoundland and Labrador and Prince Edward Island all charge HST. Nova Scotia is at 14 per cent after its April 1, 2025 cut, and the other three are at 15 per cent. Working across the Maritimes means carrying the rate for the job site, not the home office.

Building a tax-inclusive ductwork quote

Start with your pre-tax price, built from labour hours, material cost, equipment, overhead and margin. Tax goes on top and is never buried inside. If your hvac contractor pricing already carries a margin target, tax must not eat into it.

Show four lines: labour, materials, subtotal, tax. Then the total. Customers accept a tax line they can see and have explained. They resist a total that grows after the fact.

State the rate that applies, your GST/HST registration number, and how long the price holds. Material prices move, and a quote with no expiry date is a quote you may have to honour at a loss.

Here is a worked example for a residential duct replacement in Ontario.

Ontario example: labour 1,520 plus materials 1,180 gives a subtotal of 2,700. HST at 13 per cent adds 351, and the total is 3,051.

The contractor paid about 153 in HST on the materials, and that 153 comes back as an input tax credit, so the true material cost stays at 1,180. Of the 351 collected from the customer, 198 goes to the CRA after the credit.

Run the same job in British Columbia. The subtotal is 2,700, GST at 5 per cent adds 135, and the total is 2,835.

Materials there cost 1,180 plus about 83 in PST that is not recoverable, and the GST paid on them is 59, which comes back.

The quote has to carry that 83 or the margin shrinks.

Rebates change the customer conversation. Utility efficiency programmes and federal retrofit grants usually calculate on the pre-tax amount, so nobody should expect tax to be rebated. Say that on the quote.

A hvac contractor quote template with the tax fields built in prevents quoting one province's rate on another province's job.

Filing, remitting and keeping records

The CRA assigns your reporting period from annual taxable revenue. Small businesses file annually, mid-sized ones quarterly, the largest monthly. You can request a different frequency to match your cash cycle.

The return is due one month after the end of the period. A December 31 year end means January 31 for an annual filer. Quarterly filers face four deadlines a year.

You can file through CRA My Business Account, by phone, by mail, or through accounting software that transmits directly. Each channel is described at How to file - File your GST/HST return - Canada.ca.

Payment is due the same day as the return. Filing without paying starts interest immediately, plus a penalty for repeated late filing.

Keep records six years from the end of the tax year they relate to: invoices, receipts, contracts, quotes, bank statements and the working papers behind each return.

The quick method remits a set percentage of revenue instead of tracking credits on every purchase. It suits high-labour, low-material contractors. Ductwork contractors with heavy material purchases usually do better on the regular method.

Reconcile before you file. Match tax charged on invoices against tax remitted, and credits claimed against supplier invoices. An hour a month prevents a year-end scramble.

Set the tax money aside in a separate account. What you collect is not your money, and contractors who spend it on payroll in a slow month end up borrowing to remit.

Province-by-province tax table for ductwork quotes

Pick the rate before you send the quote, not after. Rates change, so confirm against the provincial source before you rely on a number.

Three checks keep you out of trouble.

Cross-border jobs need care. A Manitoba contractor installing ductwork in Saskatchewan charges Saskatchewan tax and follows Saskatchewan rules for materials bought there. Keep each province's paperwork separate so the returns stay clean.

If you are unsure which tax applies to a contract, settle it before you sign. A wrong rate on a large commercial ductwork project can wipe out the margin, and reissuing an invoice after payment is awkward.

Common questions

Do I charge GST or HST on ductwork installation?

Yes. Installation, replacement, sealing and cleaning are taxable supplies. You charge the tax that applies where the work is performed and remit it through your GST/HST return.

Can I claim input tax credits on ductwork materials?

Yes, on materials and subcontractor invoices used in the business, provided you hold valid invoices showing the supplier's GST/HST number and the tax. In separate-tax provinces the provincial portion is often not recoverable.

Is the small supplier threshold the same in every province?

The federal threshold is 30,000 dollars in taxable revenue over four consecutive calendar quarters, and it applies across Canada. Quebec administers its own QST registration, also at 30,000 dollars. Operating in Quebec means checking both sets of rules.

Should my ductwork quote show tax separately?

Yes. Show labour, materials, subtotal, tax and total. A separate tax line tells the customer what they are paying and protects you when the rate or the material cost moves.

How long do I keep GST/HST records?

Six years from the end of the tax year the records relate to. That covers invoices, receipts, contracts, quotes and the working papers behind each return.

What happens if I charge the wrong provincial rate?

You still owe the correct tax to the CRA or the provincial authority. You may need to credit the customer and reissue the invoice, so check the rate before the quote goes out.