Deadlines
2027 deadlines: the self-employed tax calendar
April 30 to pay, June 15 to file: the deadlines for the 2026 income tax return, the GST and QST and the instalments, in one calendar.
October 17, 2026 · 3 min read
The MKronos blog
Sales taxes, deductions and deadlines: clear guides for self-employed workers in Quebec.
Income tax
Tax instalments: who has to pay them, and how to calculate them
With no tax withheld at source, self-employed workers pay part of their tax in advance. The $1,800 threshold, the four due dates, the calculation methods and the QPP contribution.
October 13, 2026 · 3 min read
Deductions
Vehicle: deducting your expenses and keeping your logbook
Gas, insurance, maintenance, leasing: the business portion of your vehicle expenses is deductible, as long as you can prove it. The logbook, the 2026 limits and the traps to avoid.
October 8, 2026 · 3 min read
Deductions
Home office: the conditions and how to calculate the deduction
Do you work from home? Part of your rent, electricity and insurance may be deductible. Here are the conditions, and how to calculate the share you can claim.
October 1, 2026 · 3 min read
Deductions
Deductible expenses for the self-employed: a T2125 and TP-80 guide
What you can deduct, what you cannot, the difference between an expense and a depreciable purchase, and the receipts to keep.
September 24, 2026 · 4 min read
Sales taxes
The $30,000 threshold: when to register for the GST and QST
Small supplier status, the four-quarter test, the 29-day deadline: what you need to know to register at the right time, neither too early nor too late.
September 15, 2026 · 4 min read