Being self-employed in Canada means you are responsible for your own income tax instalments and CPP contributions - there is no employer withholding tax from your pay. Self-employed individuals pay both the employee and employer portions of CPP, which for 2026 amounts to 11.9% of net self-employment earnings up to the maximum pensionable earnings. On top of that, your net business income is taxed at your full personal marginal rate. This estimator takes your gross revenue, deductible business expenses, province, and any other income sources and produces an estimate of your annual tax bill, CPP owing, and net take-home income. If your expected federal tax owing exceeds $3,000, CRA requires quarterly instalments - this tool flags that threshold.