Capital Gains Tax Rules
Capital gains tax is a small set of rules that compound into confusing outcomes — and most expensive surprises come from applying them in the wrong order. This guide walks the full chain the way the tax code applies it: what your basis is, how holding period splits your gains, the exact netting order, what happens when losses win, and how the home-sale exclusion works — with the common traps flagged along the way. The capital gains calculator executes these steps on your actual numbers with the math visible.
Your gain is not the sale price — it is sale price minus basis, and basis is what you paid plus acquisition costs (fees, commissions). Selling costs reduce the proceeds side. Every improvement to a property adds to basis; every bit of depreciation claimed subtracts from it (and is taxed separately as recapture on rental property). Basis records are why "keep your closing documents" is real advice.
Hold an asset one year or less → short-term gain, taxed as ordinary income at your regular bracket rates. Hold more than a year → long-term gain, eligible for the preferential LTCG rates. For 2026, the LTCG breakpoints: 0% up to $49,450 (single) / $98,900 (married filing jointly); 15% up to $545,500 / $613,700; 20% above. The boundary is greater than 365 days — one day past a year flips the rate class, so check dates carefully around anniversaries.
- Net short-term gains against short-term losses within the short-term bucket.
- Net long-term gains against long-term losses within the long-term bucket.
- Then net the two bucket totals against each other.
The order is not cosmetic: a long-term loss offsets long-term gain first (where it saves the most), and only the final cross-net determines how much of any gain is taxed at which rate. The actual tax computation runs on the qualified dividends and capital gains tax worksheet — Schedule D is largely an assembly of the pieces.
A net capital loss offsets ordinary income up to $3,000 per year. Anything beyond the cap carries forward to future years — indefinitely. Enter your carryforward each year; unused losses are real assets on your personal books.
Your primary residence gets a statutory exclusion: up to $250,000 of gain if single, $500,000 if married filing jointly — provided ownership-and-use tests are met. Check any calculator's figures before trusting its answer here: some use outdated exemption amounts below the statutory values, which silently overstates a home seller's tax.
"Qualified" dividends (generally shares held more than 60 days around the ex-dividend date) join the LTCG rate stack; non-qualified dividends are ordinary income. Funds report the split; your holding period decides which side each dollar lands on.
These are the general rules. Fact-specific situations — rentals, trusts and estates (which are separate taxpayers with their own rules), inherited property — deserve professional review; this guide is not personal tax advice.
Frequently asked
**How long do I have to hold an investment for long-term rates?**
More than one year — 12 months plus a day. Gains on anything held a year or less are taxed as ordinary income regardless of amount.
What if I sell my home at a profit? If it was your principal residence and you meet the ownership-and-use tests, up to $250,000 of gain is excluded ($500,000 married filing jointly). Above that, the excess follows the normal gain rules. Verify any tool's exclusion figures — outdated amounts are a known error.
Can capital losses offset my salary? Up to $3,000 per year, yes; beyond that, losses carry forward to future years. Losses first offset gains (where they save the most), then ordinary income within the cap.
Are dividends taxed like capital gains? Only qualified dividends — those on shares held more than 60 days around the ex-dividend date. The rest are ordinary income, at your regular bracket rates.