Regardless of which country's rules apply, one habit determines whether tax season is manageable or miserable: consistent, contemporaneous record-keeping. Traders who log everything as it happens spend an afternoon compiling a return; traders who don't spend weeks reconstructing a year of activity from memory and scattered statements.
Specific reporting requirements, forms, and deadlines vary by country and change over time. Use this as a general organizational framework, and confirm the exact filing requirements that apply to you with a qualified tax advisor.
What to Log for Every Trade
- ▸Instrument, direction, entry date/time, and entry price.
- ▸Exit date/time and exit price.
- ▸Position size and any leverage used.
- ▸Fees, spreads, commissions, swap/financing charges paid.
- ▸Currency of the trade and the exchange rate applicable at the time, if different from your reporting currency.
- ▸Realized gain or loss, calculated after all costs.
A Practical Monthly Routine
- 1.Export a full account statement from every broker used that month.
- 2.Reconcile the exported statement against your own trade log — discrepancies are far easier to catch monthly than annually.
- 3.Convert any foreign-currency figures to your reporting currency using a consistent, documented method (e.g. month-end or transaction-date rates).
- 4.Store statements, confirmations, and calculations in a dedicated folder structure organized by broker and tax year.
Why This Matters More With Multiple or Foreign Brokers
A single domestic, regulated broker often handles much of the tax calculation and withholding automatically. The moment you add a second broker, a foreign broker, or a mix of instrument types (spot forex, CFDs, futures, crypto), automatic handling typically breaks down, and manual reconciliation becomes the only reliable safeguard against errors or omissions.
| Tool | Use case |
|---|---|
| Broker's own annual tax report (if provided) | Starting point, but verify completeness across account changes/transfers |
| Dedicated trade-journaling software | Consistent per-trade logging with export capability |
| Spreadsheet template with formulas for realized P&L | Flexible, auditable, works across any broker |
| Portfolio/tax-reporting aggregation services | Useful for consolidating many accounts, but verify accuracy against source statements |
// Simplified example: realized P&L per trade
const realizedPnL = (exitPrice - entryPrice) * positionSize * contractMultiplier
- commissions - swapCharges;
// Log this figure alongside date, instrument, and currency for every closed trade.Preparing for Your Tax Advisor
- ▸Bring organized annual summaries, not a folder of raw, unsorted statements.
- ▸Flag any unusual events — account transfers, broker insolvency, bonus credits, or corporate actions.
- ▸Disclose all accounts and platforms used, even small or inactive ones — omissions create bigger problems than modest balances.
The Bottom Line
Good record-keeping is cheap insurance against tax-season chaos, audits, and honest mistakes. Build the habit of logging trades and exporting statements monthly, and the annual filing — whatever form it takes in your country — becomes a matter of compiling, not reconstructing.