Declaração de imposto sobre day trade
Active traders create a large number of taxable events. Reporting those events correctly is not optional — errors can turn a paper loss into a tax liability. The key is to keep complete records and understand the wash-sale and same-day rules that apply in your jurisdiction.
Records you must keep
- Date and time of every buy and sell.
- Quantity and ticker or instrument name.
- Proceeds and cost basis per lot, including commissions and fees.
- Currency conversion if trading foreign instruments.
- Broker statements and trade confirmations for at least the period required by local law, typically 5–7 years.
U.S. forms overview
Most U.S. retail traders report on Form 8949 and Schedule D of Form 1040. Brokers issue Form 1099-B showing proceeds, but the cost basis may be incomplete or adjusted for wash sales. Traders must reconcile the 1099-B with their own records and report any differences.
Wash-sale rules
A wash sale occurs when you sell a security at a loss and buy the same or a 'substantially identical' security within 30 days before or after the sale. The loss is disallowed and added to the cost basis of the new position. Day traders who scale in and out of the same stock repeatedly trigger wash sales constantly, turning what looks like a loss year into a taxable gain year.
Crypto and forex wrinkles
Cryptocurrency is treated as property in the U.S., meaning every crypto-to-crypto or crypto-to-stablecoin trade is a taxable event. Retail forex is generally covered by Section 988, which taxes gains as ordinary income and does not allow the 60/40 split available to Section 1256 contracts. Both asset classes magnify the record-keeping burden.
Frequently asked questions
Do brokers report day trading taxes for you?
They report proceeds on Form 1099-B, but the trader is responsible for accurate cost-basis and wash-sale reporting. Broker reports are often incomplete.
What happens if you don't report day trading?
Unreported gains can trigger penalties, interest and audits. Even if you lost money overall, you must still file to claim losses and avoid automatic underreporting notices.
How long should day traders keep tax records?
At least three to seven years after filing, depending on jurisdiction. Given the complexity of active trading, seven years is the safer default.
Do wash-sale rules apply to crypto?
In the U.S., wash-sale rules currently apply to securities, not to most cryptocurrencies, though legislation to change this has been proposed repeatedly.