Do not merge different questions
Separate three layers: what happened economically, what the documents support and how the event is classified under the applicable rules. A purchase and sale belong to the first layer; a broker report and payment confirmation to the second; whether a particular expense may be recognized belongs to the third. A number in a spreadsheet is not automatically a number that may be used in a tax base.
Establish the jurisdiction, tax period, person’s status and intermediary’s role separately. Citizenship, broker address and tax residence are not interchangeable. When several countries are involved, the issue may require checking international rules and withholding documents rather than applying one rate to all income.
Do not carry an old article into a new period. Even an official overview may contain historical examples or general explanations that are insufficient for a specific transaction. A legal conclusion requires the rules applicable to the relevant period; when uncertain, seek an individual explanation from a competent specialist.
Fields for a transaction journal
For each transaction, keep the date, event type, instrument, quantity, price, currency, cash received or paid, commission and a link to the document. It is also useful to record settlement date, transaction identifier and any tax withheld. Do not silently merge trade date with the date cash actually moved.
For receipts, record their source and character separately: interest, dividends or another payment. A transfer of your own money between accounts is not investment income merely because it appears in a receipts column. Corporate actions, changes in share count and transfers between intermediaries need their own records so the ownership history is not broken.
Keep original reports beside the working spreadsheet. An analytical file helps locate transactions but does not replace documents. If a corrected report arrives, retain both versions and mark which is operative and why it replaced the other. Do not edit an original so that it appears to have been issued in a different form.
A financial-result example, not a tax base
All numbers are illustrative. Buy 100 shares at 100 roubles each, with a 100-rouble purchase commission. Later sell the same 100 shares at 120 each, with another 100-rouble sale commission. Gross receipts are 12,000 roubles, purchase cost is 10,000, and the simple cash result after both commissions is 1,800 roubles.
This result is not declared taxable income. Deductibility of expenses, the cost-basis method for sold securities, currency conversion and other features must be checked separately. The example only demonstrates which source figures are needed. Investor.gov emphasizes the effect of costs on investment results, but that economic effect does not itself establish a tax rule.[6](#source-valuation-fees)
With several purchases of the same security, the cost of a later sale cannot be assigned arbitrarily to the most favorable lot. Record every acquisition and do not replace the applicable method with personal convenience. If intermediaries show different results, first compare dates, lots, commissions and carried-forward information.
Reconcile and store safely
Reconcile the journal with cash movements and asset quantities at period end. An unexplained difference calls for finding the transaction, not manually changing the total. Check withholdings separately: a missing line in your spreadsheet does not prove that no obligation exists, and a withholding entry does not answer every question about other income.
Financial documents contain personal information. Restrict access, protect backups and remove unnecessary identifiers before sending material for advice. A public educational example must never contain a real account number or another person’s document.
The preparation result is a reproducible package: journal, original evidence, balance reconciliation and a list of legal questions. It does not guarantee a correct return, but materially reduces the risk of losing facts and lets tax conclusions be checked separately from financial arithmetic.