If this is your first time seeing any of these terms, start here.
Sole Proprietorship
Canadian business structure where the owner and business are the same legal and tax entity. Business income reported on personal T1 via Form T2125.
Partnership
Two or more people carrying on business together. Each partner reports their share of income on personal taxes. Canadian partnerships are 'tax flow-through' entities, the partnership itself doesn't pay tax.
CCPC (Canadian Controlled Private Corporation)
Private corporation resident in Canada, controlled by Canadian residents. Eligible for the Small Business Deduction on first $500K of active business income.
Small Business Deduction (SBD)
Federal tax rate reduction on the first $500,000 of active business income in a CCPC. Combined with provincial rates, produces an effective ~9-15% rate vs ~27% general corporate rate.
T2125 Statement of Business or Professional Activities
CRA form attached to your personal T1 reporting business income and expenses. One per business. Required for all sole proprietors and partnership members.
GST/HST
Goods and Services Tax (federal, 5%) and Harmonized Sales Tax (combined federal + provincial in ON, NB, NL, NS, PEI). Collected on most taxable supplies; remitted to CRA; businesses claim input tax credits for GST/HST paid on business inputs.
Small Supplier Threshold
$30,000 of worldwide taxable revenue in 4 consecutive calendar quarters. Below this, GST/HST registration is optional. At or above, registration is mandatory within 29 days.
Input Tax Credit (ITC)
Credit for GST/HST paid on business inputs. Offset against GST/HST collected; the net is remitted to CRA. Registration enables ITC recovery even if collections are small.
Quarterly installments
Advance tax payments required when net tax owing exceeds $3,000 ($1,800 in Quebec) in the current year and one of two prior years. Due March 15, June 15, September 15, December 15.
Business Number (BN)
9-digit identifier assigned by CRA for business activities. Used as the root for GST/HST, payroll, corporate income tax, and import/export program accounts.
Active business income
Income from an active business carried on in Canada. Qualifies for the Small Business Deduction in a CCPC. Distinct from passive/investment income, which is taxed at a higher rate in a corporation.
Dividends (eligible vs non-eligible)
Eligible dividends come from income taxed at general corporate rate; non-eligible (small business) dividends come from SBD-taxed income. Each has different gross-up and tax credit mechanics on personal taxes.
TOSI (Tax on Split Income)
Since 2018, dividends paid to family members from a private corporation can be taxed at the top marginal rate unless specific tests are met. Designed to limit income splitting through private corporations.
Home Office Deduction (simplified method)
Flat $2 per day worked from home, up to $500/year. No receipts required. Useful for employees and smaller-scale self-employed.
Home Office Deduction (detailed method)
Workspace square footage / total home square footage × actual eligible home expenses (utilities, rent, maintenance, property tax, mortgage interest for owners). Usually larger deduction for full-time self-employed.
LCGE (Lifetime Capital Gains Exemption)
Federal exemption (~$1,016,000 for 2026) on capital gains from sale of Qualified Small Business Corporation shares or Qualified Farm/Fishing Property. One-time-per-lifetime per individual.
QSBC (Qualified Small Business Corporation)
A CCPC meeting specific tests on active business assets, holding period, and Canadian residency. Required for shares to qualify for the LCGE.
EI Special Benefits
Self-employed opt-in to Employment Insurance maternity, parental, sickness, and compassionate care benefits. Regular (unemployment) EI not available to self-employed.
CPP YMPE and YAMPE
Year's Maximum Pensionable Earnings (first ceiling) and Year's Additional Maximum Pensionable Earnings (second ceiling, introduced 2024 under CPP Phase 2). Self-employed contribute on earnings up to both ceilings.
Capital Cost Allowance (CCA)
Canadian term for depreciation. Allows businesses to deduct the cost of capital property over its useful life using CRA-specified classes and rates.
Bare trust
Trust where trustee holds legal title for the benefit of the beneficial owner who controls the property. CRA's T3 filing requirement for bare trusts remains paused for 2024 and 2025 tax years.
Net self-employment income
Gross revenue minus allowable business expenses. The figure reported on T2125 and added to other income on your T1. Used to calculate personal tax and CPP contributions.