ForecastingStocks

Good tax behaviour is mostly good record-keeping. The investor who keeps clean records spends an afternoon on the IRPF; the one who does not spends weeks reconstructing years of trades. This lesson is the practical habit layer. (Educational only; verify retention rules.)

What to keep, and for how long

The Receita can generally review your declaration for five years. Keep, for at least that long (verify current period):

Brokerage notes (notas de corretagem) for every trade — they are the primary evidence of cost and proceeds.
Monthly position/earnings reports and the annual informes de rendimentos from each broker, bank and fund administrator.
Every DARF you paid, with its receipt.
For foreign and crypto assets: statements, the FX rate used, transfer records, and any foreign-tax-paid documents.
A running ledger of carried-forward losses by modality.

The acquisition-cost discipline

Because Bens e Direitos uses acquisition cost, and capital gains compare sale price to average cost, you must track your average purchase price for each asset across all buys — including reinvested amounts, splits, bonuses and the effect of any fees. Brokers' reports help, but if you change broker or transfer assets, the cost history can break — so keep your own record.

A simple system that works

1. One folder per year, sub-folders: notas / informes / DARFs / exterior.
2. One spreadsheet: per asset → average cost, quantity; per month → results + losses carried.
3. Save every informe de rendimentos when it arrives (Feb–Mar).
4. Reconcile the spreadsheet to the informes before filing.

Why it pays off

Beyond surviving an audit, clean records mean you never overpay (you capture every loss offset and every cost) and you can prove the origin of your wealth if questioned. Tools and your broker's tax reports help, but the responsibility is yours. When the records get complex — many assets, foreign holdings, crypto — an accountant working from organised files is fast and cheap. Educational only.