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
36.0%of every dollar earned
Monthly Buffer
$3,037at $8,333 avg monthly revenue
Breakdown of Every $1 of Revenue
Plug in This Month's Revenue
Sweep into tax account
$3,000
Keep for yourself
$5,333
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
$9,110
By Jun 15
$18,220
By Sep 15
$27,329
By Dec 15
$36,439
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 14% to 33% applied to taxable income (net profit after the CPP deduction). At the top federal bracket, $258,482+ 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 ~48% (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). Of the base 9.9% portion, the employer-equivalent half is deductible from taxable income and the other half generates a non-refundable tax credit; the enhancement layered on top (including all of CPP2) is fully deductible.
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%.
Frequently asked questions
How much of every freelance dollar should I set aside for taxes in Canada?
The exact percentage depends on your province, income level, and whether you're GST/HST registered. Most self-employed Canadians at moderate income levels need to sweep 25–35% of every revenue dollar to cover federal + provincial income tax, both halves of CPP (11.9%), and net GST/HST remittance. High earners in top brackets approach 45%.
Do I need a separate bank account for my tax buffer?
Highly recommended. A separate high-interest savings account makes it impossible to accidentally spend tax money on business operations or personal expenses. Banks like EQ, Wealthsimple Cash, and Simplii offer high-interest accounts you can fund automatically each time you get paid.
Should I include GST/HST in my tax buffer?
Yes, if you're registered. GST/HST is collected on behalf of CRA and must be remitted on your filing frequency (monthly, quarterly, or annually depending on revenue). The amount you remit is net of Input Tax Credits on business inputs (regular method) or a flat percentage of tax-included sales (Quick Method).
How does the safety margin work?
The safety margin is a percentage (default 10%) added on top of the calculated income tax + CPP + GST/HST buffer. It covers unexpected income (windfalls pushing you into a higher bracket), missed deductions, and gives you a cushion if your income forecast is too low. Increase to 15-20% if your income is highly variable or you have other untaxed income sources.
Sources
Last updated May 2026. Reflects 2026 tax year rates including CPP YMPE $74,600 and YAMPE $85,000.
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