How to Use the Long-Term Capital Gains Tax Calculator
Korea reduces the taxable amount of a home-sale gain directly through a long-term holding deduction that grows the longer you've owned and lived in the property. The US takes a different approach entirely: instead of shrinking the gain itself, it applies a completely different tax rate once you've held the asset for more than one year. This calculator classifies your gain as long-term or short-term based on the holding period you enter, then applies the corresponding 2024 federal rate — the preferential 0%/15%/20% long-term capital gains rates, or your ordinary marginal income tax rate for short-term gains — based on your total income including the gain.
For example, an $80,000 gain held for 24 months (long-term) with $70,000 in other taxable income puts your total income at $150,000, which falls in the 15% long-term capital gains bracket — resulting in $12,000 of tax and a net gain of $68,000. If the same gain were held for only 6 months, it would instead be taxed as ordinary income at your marginal rate, which is very likely higher.
This is a simplified estimate for a single filer and doesn't account for state capital gains tax, the Net Investment Income Tax (an additional 3.8% for higher earners), or special rules like the primary residence exclusion. Crossing the one-year holding mark is one of the most impactful things you can control for your tax bill, so confirm your exact numbers with a tax professional before selling.
Frequently Asked Questions
Assets held for more than one year get preferential long-term capital gains rates of 0%, 15%, or 20% depending on your total taxable income. Assets held one year or less are taxed as short-term gains at your ordinary income tax rate, which can be significantly higher.
No. Korea reduces the taxable gain itself through a long-term holding deduction that grows with years held. The US instead applies a completely different, usually lower, tax rate once you cross the one-year mark, rather than reducing the gain amount.