Not tax advice. Computation tools only. Have a professional review before filing.
CA·Tax year 2025 · Filing 2026

Canada tax deadlines 2026.

Every individual and self-employed income tax deadline for Canada in 2026. Plus recurring VAT / GST / sales tax filings. Each deadline links to notes on how to file, what people miss, and matching open-source tax skills.

Annual deadlines

2 this year

Recurring filings

VAT / GST / Sales tax

GST/HST Return

Canada

Quarterly

Canadian GST/HST return. Quarterly by default; annual for small suppliers under $1.5M; monthly for high-volume.

Open-source skills for Canada

Prepare this return with open-source skills

These skills are in the OpenAccountants repo. Clone them into Claude, Cursor, or any AI agent and they handle the computation.

ca-fed-cpp-ei.mdCA-FED

Use this skill whenever asked about Canada Pension Plan (CPP) or Employment Insurance (EI) contributions for self-employed individuals. Trigger on phrases like "CPP self-employed", "Schedule 8", "CPP2", "YAMPE", "EI opt-in self-employed", "how much CPP do I pay", "self-employed EI benefits", "CPP contribution calculation", or any question about CPP/EI obligations for a self-employed sole proprietor or single-member entity in Canada. This skill covers CPP1 rates, CPP2 second ceiling, Schedule 8 computation, EI voluntary opt-in, tax treatment (line 22200 deduction and non-refundable credit), age exemptions, overpayment recovery, and edge cases. ALWAYS read this skill before touching any CPP/EI-related work.

canada-gst-hst.mdCA

Use this skill whenever asked to prepare, review, or classify transactions for a Canadian GST/HST return (Form GST34) for a self-employed individual or small business in Canada. Trigger on phrases like "prepare GST return", "file HST", "Canadian sales tax", "GST/HST return", "Form GST34", "input tax credits", "ITC claim", or any request involving Canadian GST/HST filing. Also trigger when classifying transactions for GST/HST purposes from bank statements, invoices, or other source data. This skill covers federal GST and harmonized HST provinces only under the regular method. Quebec QST, Saskatchewan PST, Manitoba RST, British Columbia PST, Quick Method, and simplified method for charities are in the refusal catalogue. MUST be loaded alongside vat-workflow-base v0.1 or later (for workflow architecture). ALWAYS read this skill before touching any Canadian GST/HST work.

ca-freelance-intake.mdCA

ALWAYS USE THIS SKILL when a user asks for help preparing their Canadian tax returns AND mentions freelancing, self-employment, contracting, sole proprietorship, or unincorporated business. Trigger on phrases like "help me do my taxes", "prepare my T1", "I'm self-employed in Canada", "I'm a freelancer in Canada", "do my taxes as a contractor", "prepare my GST/HST return and income tax", or any similar phrasing where the user is a Canadian-resident self-employed individual needing tax return preparation. This is the REQUIRED entry point for the Canadian self-employed tax workflow -- every other skill in the stack (canada-gst-hst, ca-fed-t2125, ca-fed-t1-return, ca-fed-cpp-ei, ca-fed-instalments, ca-return-assembly) depends on this skill running first to produce a structured intake package. Uses upload-first workflow -- the user dumps all their documents and the skill infers as much as possible before asking questions. Uses ask_user_input_v0 for structured questions instead of one-at-a-time prose. Built for speed. Canadian full-year residents only; sole proprietors only (not incorporated).

ca-return-assembly.mdCA

Final orchestrator skill that assembles the complete Canadian filing package for Canadian-resident sole proprietors. Consumes outputs from all Canadian content skills (canada-gst-hst for GST34, ca-fed-t2125 for business income, ca-fed-t1-return for federal return, ca-fed-cpp-ei for CPP/CPP2/EI, ca-fed-instalments for instalment schedule) to produce a single unified reviewer package containing every worksheet, every form, every brief section, all cross-skill reconciliations, and the final action list with payment instructions, filing instructions, and next-year planning. This is the capstone skill that runs last and produces the final deliverable. MUST be loaded alongside all Canadian content skills listed above. Canadian full-year residents only. Sole proprietors only (not incorporated).

ca-fed-t1-return.mdCA-FED

Use this skill whenever asked about a Canadian federal T1 General individual income tax return for a self-employed sole proprietor. Trigger on phrases like "T1 return", "personal tax Canada", "federal tax brackets", "basic personal amount", "CPP self-employed", "CPP2", "self-employment tax Canada", "net income", "taxable income", "federal tax calculation", "non-refundable credits", "instalment payments", or any question about computing federal tax for a self-employed individual in Canada. ALWAYS read this skill before touching any T1 return work.

ca-fed-t2125.mdCA-FED

Use this skill whenever asked about Canadian self-employment business income reported on Form T2125 (Statement of Business or Professional Activities). Trigger on phrases like "T2125", "business income Canada", "self-employed expenses", "CCA", "capital cost allowance", "home office Canada", "motor vehicle expenses CRA", "business-use-of-home", "sole proprietor Canada", "net business income", "business number BN", "fiscal year end", "GST ITC", or any question about computing, classifying, or reporting business income and expenses for a Canadian sole proprietor. Covers Parts 1-8 of T2125, allowable expenses, CCA classes and rates, AccII, business-use-of-home, motor vehicle expenses, GST/HST interaction, and net income computation. ALWAYS read this skill before touching any T2125 work.

Preparing a Canada return?

The OpenAccountants repo has verified, open-source tax computation skills. Clone and run them with your AI agent, then get an accountant to review.