Self-Employed Tax Buffer Calculator
Find the percentage of every dollar you earn that should leave your operating account and land in a tax savings account. Covers federal + provincial income tax, both halves of CPP, GST/HST net remittance, and a safety margin.
Your Annual Numbers
Sweep Rate
37.0%
of every dollar earned
Monthly Buffer
$3,055
at $8,333 avg monthly revenue
Breakdown of Every $1 of Revenue
Plug in This Month's Revenue
Sweep into tax account
$3,083
Keep for yourself
$5,250
Hold the swept amount in a separate high-interest savings account until each CRA deadline: Mar 15 / Jun 15 / Sep 15 / Dec 15 for income tax instalments, and your GST/HST filing frequency (monthly / quarterly / annually) for sales tax.
Quarterly Milestones for Your Tax Account
By Mar 15
$9,163
By Jun 15
$18,327
By Sep 15
$27,490
By Dec 15
$36,654
Why a tax buffer matters: Self-employed Canadians don't have CRA withholdings on each payment. Without a disciplined sweep system, the combined federal+provincial income tax + 11.9% CPP + GST/HST remittance can hit 35-45% of revenue and surprise you at filing. The "buffer rate" here is the percentage of every dollar earned that should leave your operating account and land in a tax-savings account.
How the Tax Buffer Rate Adds Up
Federal income tax: Marginal rates from 15% to 33% applied to taxable income (net profit after half-CPP deduction). At the top federal bracket, $246,752+ income (2026) attracts 33%.
Provincial / territorial income tax: Varies widely. Alberta has a relatively flat schedule; Quebec residents pay separately (use Quebec threshold $1,800 for instalments). Top combined marginal rates range from ~44% (AB) to ~54% (NL, NS, NB).
CPP — both halves: Self-employed Canadians pay 11.9% combined on pensionable earnings ($3,500 basic exemption up to $74,600 YMPE in 2026). CPP2 adds an additional 8% (both halves) on earnings between YMPE and YAMPE ($85,000 in 2026). Half the total CPP is deductible from taxable income.
GST/HST net remittance: If registered, you must remit GST/HST collected from customers, less Input Tax Credits on business inputs (regular method) or a flat % of tax-included sales (Quick Method, eligible if annual tax-included revenue is under $400,000).
Safety margin: Default 10% on top of computed tax. Buffers against income variability, missed deductions, and forecast error. Self-employed Canadians with consulting / project-based revenue often increase this to 15–20%.
Sources
Last updated May 2026. Reflects 2026 tax year rates including CPP YMPE $74,600 and YAMPE $85,000.
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