The third 2026 Winter Founder Fundamentals session was led by Saba Medghalchi, a tax and finance professional at YSpace who walked founders through one of the most stress-inducing parts of entrepreneurship: tax season. Rather than focusing on loopholes or aggressive optimization, Saba framed tax preparation as a clarity-building exercise. The session emphasized that most costly tax mistakes don’t come from complexity, but from misunderstanding how the CRA actually sees your business. Designed specifically for early-stage founders, the session focused on Canadian tax fundamentals for sole proprietors and very early corporations, helping founders move from uncertainty to confident, informed decision-making.
The First Question That Matters: Are You Incorporated or Not?
Saba began with a foundational distinction that shapes everything else: legal structure. If a founder has not incorporated, the CRA treats them as a sole proprietor, regardless of how “official” the business feels. Logos, websites, clients, and brand names do not change this. Only incorporation or registration does.
For sole proprietors, business income is reported through the personal T1 return using Form T2125, which acts as the CRA’s primary lens into how the business operates. For incorporated companies, tax obligations expand to include corporate T2 returns, financial schedules, and separate CRA program accounts.
The key takeaway was simple but critical: the CRA cares about structure, not branding.
T2125 Is Where Your Business Lives for Tax Purposes
Saba positioned the T2125 not as a form to rush through, but as the central document the CRA uses to understand a founder’s business activity. It captures identification details, fiscal period, business activity codes, income streams, expenses, and equity information.
Founders were reminded that accuracy here matters. The six-digit industry code, for example, helps the CRA set expectations around revenue patterns and expense margins. Selecting the wrong code can unintentionally raise red flags during reviews.
Another important clarification: founders with both business income (selling goods) and professional income (consulting or services) must complete separate T2125 forms. Combining them into one is a common and costly mistake.
Understanding the Difference Between Gross Profit and Net Income
A major portion of the session focused on helping founders read their numbers properly. Gross profit reflects how efficiently a business produces or delivers its core offering, while net income shows what remains after operating expenses, taxes, and interest.
Saba explained that a business can look healthy at the gross margin level but still operate at a loss due to high overhead or poor cost control. From the CRA’s perspective, consistently weak gross margins may signal deeper structural issues, making this distinction more than just an accounting concept.
What Expenses Are Actually Deductible?
To simplify expense eligibility, Saba introduced a practical rule: if an expense helps earn income, it is usually deductible, provided it is properly documented.
She grouped deductible expenses into three broad categories:
- expenses used exclusively to operate the business
- expenses tied to the business space (office, utilities, rent)
- expenses incurred while doing business (vehicles, travel)
Personal-first expenses such as everyday clothing, gym memberships, commuting, and traffic tickets do not qualify. The session stressed that documentation is not optional. Receipts, logs, and clear business purpose are essential if the CRA asks questions later.
Home Office, Vehicles, and the Importance of Proration
For founders working from home or using personal vehicles, Saba walked through how to properly prorate expenses instead of claiming 100% of costs. The T2125 includes dedicated sections for both home office and motor vehicle expenses, allowing founders to calculate business-use percentages based on square footage or mileage logs.
A critical constraint highlighted was that home office expenses cannot create or increase a business loss. They can only reduce business income to zero, not below.
Consistency was emphasized throughout. Once a founder chooses a method to calculate business use, it should remain stable year over year.
Assets, Depreciation, and Capital Cost Allowance (CCA)
Not all purchases are treated equally. Saba clarified that items expected to last more than one year must be capitalized and depreciated over time using CRA asset classes. Computers, vehicles, furniture, and equipment each fall under specific classes with predetermined depreciation rates.
Understanding this distinction prevents founders from overstating expenses in a single year and helps avoid corrections during CRA reviews.
GST/HST: When Registration Is Mandatory, Not Optional
The session also covered GST/HST obligations, starting with the $30,000 small supplier threshold. Once taxable revenue exceeds this amount in any 12-month period, registration becomes mandatory, not optional.
Saba walked through multiple scenarios to show how timing affects registration dates, tax collection, and remittance. A key warning was that failing to register on time does not eliminate liability. The CRA can retroactively assess GST/HST owed, even if the founder never collected it from clients.
Another crucial reminder: GST/HST collected is not business income. It belongs to the government and should never be spent.
How Business Income Affects Personal Taxes
For sole proprietors, net business income flows directly into the personal T1 return and is taxed alongside other income. Founders are responsible for both income tax and the full CPP contribution (employee and employer portions), which often comes as a surprise during the first tax year.
Saba encouraged founders to proactively set aside 25–30% of income to cover taxes, CPP, and GST/HST, reducing the shock of year-end balances.
She also clarified key deadlines: April 30 for payments to avoid interest, and June 15 for filing to avoid penalties. These dates are different, and confusing them is a common mistake.
The session closed with a clear principle: early-stage founders should focus on compliance and clarity before optimization. Filing correctly, separating personal and business finances, tracking income and expenses consistently, and understanding obligations early prevents far more problems than chasing tax savings too soon.
Tax season may never be a founder’s favorite time of year, but with structure, preparation, and informed decision-making, it doesn’t have to be a source of stress.
About Founder Fundamentals
Founder Fundamentals is a 12-week workshop series hosted by YSpace and Black Enterprenurship Alliance and powered by City of Markham designed to equip you with essential entrepreneurial skills. Attend 9+ workshops to earn a Certificate of Completion and take the first step toward entrepreneurial success!
About the Speakers
Saba Medghalchi is a tax and finance professional at YSpace. She works closely with early and growth-stage companies to bring clarity to complex financial and accounting decisions. With experience across startups, corporations, and non-profits, she combines strategic finance, operational insight, and hands-on Canadian tax and accounting expertise to support businesses as they scale.