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Day trader bookkeeping: your broker statement is not a set of books
A broker statement is a record of executions, not a set of books — it knows nothing about your expenses, your other accounts, or what anything was worth in Canadian dollars on the day it happened. Traders whose activity is business income need a real profit and loss: trading gains net of data feeds, platform costs, interest, and overhead. We build that from trade logs and broker data every month.
By the AnalytIQ Accounting team · Last reviewed: August 12, 2026
Why the broker statement is not your books
An Interactive Brokers or Questrade statement shows fills, commissions, and realized gains — usually in US dollars — and stops there. It does not know about your data subscriptions, your second brokerage account, your margin interest at another institution, or the CAD value of any trade on its settlement date. For Canadian tax, every disposition needs a Canadian-dollar result, and a USD statement simply does not contain that number.
Statements also mislead in quieter ways. A transfer between your own accounts can look like a withdrawal, corporate actions reshuffle positions without context, and year-end summaries net together figures a tax filing needs separated.
What the statement shows versus what the books need
| On the statement | What your books need instead |
|---|---|
| Realized P&L in USD | Results converted to CAD at proper transaction-date rates, so the taxable outcome includes the currency movement too |
| Deposits and withdrawals | Capital contributions and draws tracked as equity movements, cleanly separated from trading results |
| Commissions only | The full cost picture: platform fees, market data, hardware, margin interest, home office |
| One account at a time | Every broker and both currencies consolidated into a single profit and loss for the operation |
| Open positions at market value | A consistent, defensible year-end treatment of open positions, applied the same way every year |
Business-income traders need a real profit and loss
CRA decides whether you are investing or running a trading business on facts: frequency of transactions, holding periods, time spent, market knowledge, and how the activity is financed. When the answer is business, gains are fully taxable as income on a T2125 — or a T2 if you trade through a corporation — losses are fully deductible against the gains, and operating expenses become claimable.
That filing position is only as strong as the records behind it. Books that show a deliberate operation — segregated capital, tracked costs, monthly results — support business treatment far better than a folder of statements assembled in April. The same records let you respond quickly if CRA ever reviews the characterization, something it has pursued aggressively with high-volume accounts, including TFSAs.
Platform and data costs are why the books pay for themselves
Active traders carry real overhead that no statement aggregates: market-data subscriptions, charting tools like TradingView, execution platforms, news services, monitors and machines, and margin interest. For a business-income trader these are deductible — but only if something captures them month by month, matched against the trading results they support.
One wrinkle worth knowing: trading securities is an exempt financial service for GST/HST purposes. You charge nothing, you generally cannot register, and there are no input tax credits — so the sticker price of your data stack is its true cost, and the books should present it that way.
Segregate your trading capital
Run the operation through dedicated bank and brokerage accounts, and let the books treat money in and money out as capital movements rather than income or expense. Paying for groceries out of a trading account blurs exactly the business-versus-personal line you want to keep sharp — for CRA, and for your own read on whether the trading actually earns its keep.
US brokerage accounts add two more layers: USD balances that need consistent translation, and T1135 foreign-property reporting once the total cost of specified foreign property passes CAD 100,000 outside registered accounts. W-8BEN, 1042-S slips, and US estate-tax exposure on US-listed holdings live on our cross-border tax page for day traders; the mechanics of our monthly close are on the bookkeeping services page.
Source: CRA — T4037, Capital Gains guide.
Common questions.
Can my accountant just work from year-end broker statements?
For a passive investor, sometimes. For an active trader the statement lacks per-trade CAD conversion, expense capture, and consolidation across accounts — the pieces that determine what you actually owe.
Does business-income treatment change the bookkeeping?
Yes. Gains become fully taxable revenue and operating costs become deductible, so the books must produce a genuine profit and loss for a T2125 or T2 — not just a capital gains schedule.
Do I charge GST/HST or claim ITCs as a trader?
No. Trading securities is an exempt financial service, so there is nothing to charge and no input tax credits to recover on your platform and data costs.
Related reading
Books that back your filing position.
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