Ontario HVAC work splits between service calls and large installs, and the Construction Act applies to the install side: a proper invoice starts the 28-day clock and the lien deadline runs 60 days. Markup formats both invoice types, tracks the deadlines, and keeps a T5018 total for any subcontracted installer.
Tax
13% HST
Lien deadline
60 days
Lien statute
Construction Act, SO 2017 c.10 Sch.1, s.31
Holdback
10% statutory holdback on the pre-tax value of each draw
Ontario runs a 28-day prompt-payment clock that starts when the payer receives a proper invoice under section 6.1 of the Construction Act.
Gas and refrigerant licensing in Ontario
HVAC gas work in Ontario requires a TSSA gas technician certificate (G1, G2, or G3), and handling refrigerant requires an ODP (ozone-depleting substances) card. Markup does not manage these certifications; it is your invoicing and compliance software. Store your business details once and they appear on every invoice.
What Markup does for HVAC techs in Ontario
- Formats Construction Act proper invoices so the 28-day clock starts on large installs.
- Handles quick service-call invoices without forcing the full proper-invoice format.
- Tracks the 60-day lien preservation deadline per install, with alerts at 14 and 7 days.
- Calculates 13% HST and separates it from the base amount on every invoice.
- Keeps a running T5018 total for any subcontracted installer, flagging the $500 line.
HVAC techs in Ontario: common questions
Do Construction Act proper invoices apply to HVAC service calls?
They matter most on improvement contracts: full system installs, new construction, and commercial fit-ups. A maintenance service call is a standard invoice. Markup asks which applies and formats each correctly.
How long do I have to file a lien on an Ontario HVAC install?
60 days from the last day of supply under section 31 of the Construction Act, then 90 more days to perfect the lien. Markup tracks both deadlines per project.
Does Markup track my TSSA gas certification or refrigerant card?
No. Gas work needs a TSSA G1/G2/G3 certificate and refrigerant handling needs an ODP card, but those stay with TSSA. Markup handles your invoicing, tax, liens, and T5018.
Built for HVAC techs in Ontario.
Proper invoices, lien deadlines, holdback, T5018, and 13% HST. Free for 14 days, no card.