The loss is real, but the deduction comes in installments

Under US federal rules, trading losses first offset your capital gains with no cap. If losses are left over, you can deduct up to $3,000 a year against wages and other ordinary income. For married people filing separately, the figure is $1,500.

The cap surprises people after a bad first year. A 20,000 dollar trading loss does not come off a salary in one go. It comes off 3,000 at a time, unless future gains absorb it faster.

The $3,000 figure is not indexed for inflation, so it has stayed the same for decades. Confirm it for the year you file anyway, since tax law can change.

All of this applies to traders taxed as investors, which is the default. Mark-to-market status works differently, and it comes later in this piece.

Netting runs in a fixed order. Short-term losses offset short-term gains, and long-term losses offset long-term gains. Then the two net results offset each other.

Day trades are short-term because you held them for a year or less. Short-term gains are taxed at ordinary income rates, so short-term losses that cancel them save tax at those rates too.

Only the final net loss meets the annual cap. Say you made 8,000 in long-term gains on an old holding and lost 10,000 day trading. The net loss is 2,000, and all of it fits under the cap this year.

Losses beyond the cap carry forward and keep their character. A short-term loss stays short-term in later years, and it offsets future gains before anything comes off income again.

Say you finish year one with a net short-term loss of 14,000 dollars and no other gains. Here is how it gets used up, assuming the cap stays at 3,000.

In year two you book 4,000 in gains. The carryforward absorbs those first, then another 3,000 comes off ordinary income. Unused losses keep rolling forward until they are gone.

The carryforward is worked out on your return each year. Keep the prior year's capital loss worksheet handy, because the next one starts from it. If you change preparers, hand it over too.

Notice that the gains in year two used up 4,000 of the loss without touching the cap. Profitable years burn through a carryforward much faster than the annual deduction does.

A wash sale happens when you sell at a loss and buy the same security back within 30 days. The window runs both before and after the sale, and it covers substantially identical securities too.

The loss is disallowed for now and added to the cost basis of the new shares. It usually comes back when you finally sell the replacement. Trading the same ticker every day trips this constantly.

The year-end case hurts most. Sell for a loss in late December, rebuy in early January, and that loss moves into the new year.

Brokers report wash sales for the same security in the same account. Repurchases in your other accounts are on you to track. A replacement bought in an IRA can make the loss disappear for good.

Traders who qualify for trader tax status can elect mark-to-market under Section 475(f). Qualifying means substantial, regular and continuous trading aimed at short-term price swings.

With the election, trading gains and losses become ordinary rather than capital. The $3,000 cap no longer applies to those losses. The wash sale rule stops applying to securities covered by the election. Open positions are treated as sold at year-end prices.

The timing is strict. An existing individual taxpayer generally makes the election by the original due date of the prior year's return. For the 2027 tax year, that means by April 15, 2027.

The cost is that gains become ordinary too, and old capital loss carryforwards stay capital. They still need capital gains or the $3,000 allowance to be used. Undoing the election later takes another formal filing.

Run these in early December, before the last trading week, while you can still act on what you find. Write the totals in one place so next year starts from them. None of this replaces your broker's tax forms, which remain the numbers you file from.