Tax & CRA

Tax & CRA tools for self-employed Canadians

Estimate expenses, income tax, CPP, GST/HST registration, GST/HST remittance, and CRA instalments in one organized workflow.

Start with the Self-Employed Tax Calculator Estimate expenses first
The workflow

Start in the right order

Self-employment taxes have a natural sequence. Work through these five steps to get the full picture — from revenue and expenses all the way to CRA instalment planning.

1
Self-Employed Expense Calculator

Estimate expenses

Break down business-use expenses before calculating net self-employment income.
2
Self-Employed Tax Calculator

Calculate income tax + CPP

Estimate income tax, self-employed CPP, set-aside percentage, and after-tax income.
3
GST/HST Registration Threshold Checker

Check GST/HST registration

Check whether the $30,000 small supplier threshold or special rules may apply.
4
GST/HST Quick Method Calculator

Compare GST/HST remittance methods

If registered, compare regular GST/HST remittance with CRA’s Quick Method.
5
Quarterly Tax Instalment Calculator

Plan CRA instalments

Estimate whether quarterly instalments may apply and plan payment dates.
Find your tool

Which tool should I use?

Start with the situation that best describes you.

I want to know how much tax to set aside. Self-Employed Tax Calculator → I need help estimating write-offs. Self-Employed Expense Calculator → I have a T4 job plus side income. Side Hustle Tax Calculator → I made around $30,000 or more. GST/HST Registration Threshold Checker → I am already registered for GST/HST. GST/HST Quick Method Calculator → CRA asked me to pay quarterly. Quarterly Tax Instalment Calculator →
How it fits together

How self-employed taxes fit together

Four concepts that clarify the full picture before you start calculating.

Revenue vs. profit

Revenue is money earned before expenses. Net business income — revenue minus deductible expenses — is the taxable amount used for income tax and CPP.

Income tax and CPP

Income tax and CPP are estimated using net business income. Self-employed people pay both the employee and employer portions of CPP — 11.9% combined in 2026.

GST/HST is separate

GST/HST is based mainly on taxable revenue, not profit. It is collected from clients, remitted to CRA, and is separate from income tax obligations.

Instalments are prepayments

Quarterly instalments are prepayments toward income tax and CPP — not a separate tax. They may apply when net tax owing exceeds a threshold in the current year and at least one prior year.

Sources
  • CRA Form T2125: Self-Employment Business and Professional Activities — canada.ca (see CRA website for current link)
  • CRA Guide T4002: Self-employed Business, Professional, Commission, Farming, and Fishing Income — canada.ca/t4002
  • CRA Required tax instalments for individuals — canada.ca (see CRA website for current link)
  • CRA GST/HST registration guidance — canada.ca/gst-hst-registration
  • CRA GST/HST Quick Method — RC4058 Quick Method of Accounting
Last reviewed: June 2026.