Tax on a sole proprietorship in Alberta is personal income tax: every dollar of net business profit is added to your other income and taxed at combined federal and Alberta rates, and you also owe both halves of the Canada Pension Plan contribution on your self-employment earnings. The combined top marginal rate reaches about 48%, but most operators sit in lower brackets and cut their taxable income substantially through business expenses, a home office claim, and capital cost allowance on larger purchases.
How the CRA Treats Your Business Income
A sole proprietorship has no legal existence apart from you, so the CRA treats the business’s income as your income.1Canada Revenue Agency. Sole Proprietorship You report it on your T1 General return, using Form T2125 (Statement of Business or Professional Activities) to work out net business income.2Canada Revenue Agency. Sole Proprietorships and Partnerships T2125 starts with gross revenue, subtracts allowable expenses, and produces the net figure that flows onto your personal return.
That net figure is added to any wages, investment income, or rental income you earned, and the total is taxed at your personal rate across both federal and Alberta brackets. There is no separate corporate tax rate, no corporate return, and no way to defer income inside the business the way a corporation can. One return, one set of books, one taxpayer.
2026 Federal Tax Brackets
The lowest federal rate dropped to 14% in 2026, a change phased in partway through 2025.3Canada Revenue Agency. Income Tax Rates and Income Thresholds The 2026 brackets are:
- 14% on the first $58,523 of taxable income
- 20.5% on the portion from $58,523 to $117,045
- 26% on the portion from $117,045 to $181,440
- 29% on the portion from $181,440 to $258,482
- 33% on anything above $258,482
The federal basic personal amount for 2026 is $16,452, shielded from federal tax through a non-refundable credit, and it grades down to $14,829 for individuals with net income above $258,482.4Canada Revenue Agency. Payroll Deductions Formulas – 122nd Edition Effective January 1, 2026 The brackets apply to your total taxable income from all sources, not just business profit.
2026 Alberta Provincial Brackets
Alberta levies its own income tax on the same taxable income, using five progressive brackets at 10%, 12%, 13%, 14%, and 15%. Thresholds are indexed to inflation each year. The 10% rate covers the largest initial portion of income, and the 15% rate only applies above roughly $363,000. Alberta also provides a basic personal credit that shelters a portion of income from provincial tax, applied automatically when you file. Combined with federal tax, a sole proprietor in the top bracket pays a marginal rate of about 48%.
CPP and CPP2 for the Self-Employed
This is where self-employment gets expensive. As an employee, you pay half the CPP contribution and the employer pays the other half. As a sole proprietor, you pay both halves. For 2026, the self-employed CPP rate is 11.9% (twice the 5.95% employee rate) on net self-employment earnings between $3,500 and $74,600, producing a maximum contribution of $8,460.90.5Canada Revenue Agency. CPP Contribution Rates, Maximums and Exemptions
CPP2 then applies to earnings between $74,600 and $85,000. Self-employed individuals pay 8% on that slice, up to $832.6Canadian Federation of Independent Business. CPP and CPP2 Explained A sole proprietor earning $85,000 or more in net self-employment income owes $9,292.90 in combined CPP and CPP2 for 2026. Half the self-employed CPP contribution is deductible on your return, which softens the hit, but the total obligation catches many new operators off guard.
Deductible Business Expenses
Your tax is calculated on net income, so every legitimate deduction cuts what you owe. T2125 lists the standard categories: advertising, insurance, rent, repairs and maintenance, office supplies, professional fees, travel, utilities, motor vehicle costs, and salaries paid to employees or subcontractors.7Canada Revenue Agency. Expenses Section of Form T2125 You also select an industry code on the form, which the CRA uses to benchmark your expenses against others in the same sector.8Canada Revenue Agency. Industry Codes
The general rule: an expense must be incurred to earn business income. Personal expenses are never deductible. Mixed-use items, like a phone used for both personal and business calls, have to be prorated to the business-use percentage. Meals and entertainment are deductible at 50%. Keep every receipt. The CRA can ask for documentation going back six years, and unsupported deductions get denied on audit.
Home Office
If you work from home, you can deduct a portion of your household costs, but only if the workspace is your principal place of business (you work there more than 50% of the time) or it is used exclusively and on a regular basis to meet clients.9Canada Revenue Agency. Business-Use-of-Home Expenses
The deduction is based on the share of your home’s square footage the workspace occupies. If your office takes up 15% of the home, you deduct 15% of eligible costs. Homeowners can claim electricity, heat, water, internet, home insurance, maintenance, and mortgage interest. Renters substitute rent for mortgage interest. Mortgage principal is never deductible. One important limit: home office expenses cannot create or increase a business loss. If your income is zero or negative before applying them, you carry the unused amount forward to a future year.
Vehicle Costs
If you use a personal vehicle for business, you can deduct the business-use portion of fuel, insurance, maintenance, and lease payments or loan interest. The CRA requires a logbook recording the date, destination, purpose, and kilometres driven for each business trip, plus odometer readings at the start and end of the fiscal year.10Canada Revenue Agency. Motor Vehicle Records
A full logbook every year is tedious. The CRA allows a shortcut: keep one complete logbook for a full year to establish a base-year business-use percentage, then maintain a three-month sample in subsequent years. If the sample stays within 10% of the base year, the CRA accepts the extrapolated annual figure. Doing this properly in your first year protects the deduction for years afterward.
Capital Cost Allowance
Large purchases like equipment, furniture, or vehicles cannot be fully expensed in the year of purchase. Instead, you claim Capital Cost Allowance, which spreads the deduction over multiple years at a rate set by the CRA for each asset class.11Canada Revenue Agency. Claiming Capital Cost Allowance (CCA) General-purpose computer equipment purchased after March 2007 falls into Class 50 at a 55% declining-balance rate. Motor vehicles generally fall into Class 10 at 30%.12Canada Revenue Agency. Classes of Depreciable Property
CCA is optional each year. If your income is low and you don’t need the deduction, skip it and preserve the undepreciated balance for a year when the deduction is more valuable. Furniture and equipment used for a home office are claimed through CCA, not as regular home office expenses.
GST Registration
Alberta has no provincial sales tax, but federal GST at 5% applies to most goods and services. You qualify as a small supplier and do not need a GST account if your total taxable revenue is $30,000 or less over four consecutive calendar quarters.13Canada Revenue Agency. When to Register for and Start Charging the GST/HST Once you cross that threshold, you must register before the 30th day after the sale that pushed you over.14Canada Revenue Agency. Small Suppliers
Once registered, you collect 5% GST on taxable sales and remit it to the CRA. You offset what you owe by claiming Input Tax Credits for GST paid on business purchases like supplies, equipment, and professional services. If your credits exceed the GST you collected, the CRA refunds the difference. For most sole proprietors with revenue under $1.5 million, the CRA assigns an annual reporting period, though quarterly instalment payments on your GST account are required if your net tax for the year reaches $3,000 or more.
Installments, Filing Deadlines, and Penalties
Employees have tax withheld from every paycheque; sole proprietors don’t. If your net tax owing exceeds $3,000 for 2026 and also exceeded $3,000 in either 2024 or 2025, the CRA expects quarterly instalment payments.15Canada Revenue Agency. Required Tax Instalments for Individuals The 2026 due dates are March 15, June 15, September 15, and December 15. Missing them triggers interest. Setting aside 25% to 30% of net income throughout the year is a reasonable starting point until you know your actual rate.
Self-employed individuals and their spouses have until June 15 to file the T1, but any balance owing is still due by April 30.16Canada Revenue Agency. Due Dates and Payment Dates – Personal Income Tax Interest starts accruing May 1 on any unpaid amount. In practice, aim to have at least a reliable estimate of your tax bill paid by April 30 even if the return itself isn’t filed until June.
If you owe tax and miss the filing deadline, the late-filing penalty is 5% of your balance owing plus 1% for each full month the return is late, up to 12 months. If you were penalized for late filing in any of the three previous tax years and received a formal demand to file, that doubles to 10% plus 2% per month for up to 20 months.17Canada Revenue Agency. Interest and Penalties on Late Taxes Compound daily interest runs separately on any unpaid balance from May 1. The prescribed rate for Q2 2026 is 7% and is reset quarterly.18Canada Revenue Agency. Interest Rates for the Second Calendar Quarter Interest and penalties are not deductible. Filing on time even when you can’t pay the full balance avoids the late-filing penalty, which is usually the larger of the two hits.
Record-Keeping
The CRA requires you to keep all business records and supporting documents for six years from the end of the tax year they relate to.19Canada Revenue Agency. Where to Keep Your Records, for How Long and How to Request the Permission to Destroy Them Early That covers receipts for every expense you claimed, invoices, bank statements, vehicle logbooks, contracts, and your copy of the filed return. Digital records are acceptable if they are legible and accessible on request. The clock runs from the end of the last tax year the record relates to, not the date on the receipt: a January 2026 receipt supporting your 2026 return must be kept through the end of 2032. On audit, missing documentation means denied deductions.
One Note on Trade Names
Registration is a separate matter from tax. If you operate under any name other than your own legal name, Alberta requires you to register that trade name through the provincial Corporate Registry.20Government of Alberta. Register a Business Name Operating under an unregistered trade name can cause problems with business bank accounts and expose you to provincial penalties. If you use only your own legal name, no registration is required. Either way, the tax rules above apply the same.