Guides

Capital Gains and Estimated Tax: Do You Owe It?

Checked October 17, 2026 · Educational summary

General information, not tax, legal or financial advice. We are not the IRS. Check IRS.gov or a qualified tax professional. Sources read on October 17, 2026. Dates for 2027 and later are expected. Examples use made-up numbers. This page contains no affiliate links.

The IRS says that if tax withheld is not enough, or if you have income such as interest, dividends, rents, capital gains or prizes, you may have to make estimated tax payments. Whether you actually must pay depends on the usual tests: expecting to owe $1,000 or more after withholding and credits, and not meeting the 90% / 100% (or 110%) safe harbor. Pub. 505 (2026) gives January 15, 2027 as the due date of the last 2026 payment; if you file your 2026 return by January 31, 2027 and pay the full balance, you may not need to make that payment (see the January guide).

What Pub. 505 (2026) says about capital gains

• Capital gains appear in its Table 1-1 among changes in income not subject to withholding that should prompt you to check withholding.
• The 2026 Estimated Tax Worksheet has a step for tax on net capital gain and qualified dividends. The pub defines net capital gain as net long-term capital gain minus net short-term capital loss, and says it is taxed at a lower maximum rate than regular rates instead of the ordinary rates. It sends you to its Worksheet 2-7 for this calculation.
• Capital gains can also trigger other taxes counted in the estimate; see NIIT and Additional Medicare Tax.

If your gain arrives in one quarter

Estimated tax is due by period. The IRS says a penalty can apply for a missed period even if you are due a refund. If most of the gain came late in the year, Pub. 505 describes the annualized income installment method (Worksheet 2-9, with a line for annualized net capital gain), which may reduce or avoid the penalty; see annualized method and start mid-year.

Illustration (made-up)

You expect to owe $9,000 for 2026 and have $6,000 withheld. After withholding you would owe $3,000, which is over $1,000, so you check the safe harbor: 90% of $9,000 is $8,100, more than $6,000. If last year's total tax was $5,000 (and your 2025 AGI was $150,000 or less, so the 110% rule does not apply) and you paid $6,000 in withholding, the 100% test would be met. Whichever test applies, check it against your actual figures.

Ways to cover a gain

• Estimated payment (how to pay).
• More withholding from wages with Form W-4 (guide); the pub says you cannot give your employer a payment for estimated tax.
• Next 2026 estimated payment date: January 15, 2027 (dates).

FAQ

Does this page cover cryptocurrency?

The IRS pages we read do not discuss digital assets; we do not say how any particular token is taxed.

Is the tax rate on net capital gain given here?

No: the rates are in the pub's worksheets and tax computation tables, which we did not apply.

What we could not verify