Capital Gains Tax in Connecticut: Complete Guide 2026
Data Notice: Figures, rates, and statistics cited in this article are based on the most recent available data at time of writing and may reflect projections or prior-year figures. Always verify current numbers with official sources before making financial, medical, or educational decisions.
Capital Gains Tax in Connecticut: Complete Guide 2026
Tax information is for educational purposes only and does not constitute tax advice. Consult a licensed tax professional for your specific situation.
Connecticut is one of the highest-taxing states for capital gains, with a top marginal rate of ~6.99% that applies to all capital gains as ordinary income. The state also adds a surcharge on higher incomes, which can push the effective rate even higher. For investors, business owners, and retirees with significant investment income, understanding Connecticut’s capital gains treatment is essential for effective tax planning.
Connecticut Capital Gains Tax Rates
Connecticut taxes capital gains as ordinary income using its graduated rate structure:
| Tax Rate | Single Filer Income | Married Filing Jointly Income |
|---|---|---|
| ~3% | $0 - ~$10,000 | $0 - ~$20,000 |
| ~5% | ~$10,001 - ~$50,000 | ~$20,001 - ~$100,000 |
| ~5.5% | ~$50,001 - ~$100,000 | ~$100,001 - ~$200,000 |
| ~6% | ~$100,001 - ~$200,000 | ~$200,001 - ~$400,000 |
| ~6.5% | ~$200,001 - ~$250,000 | ~$400,001 - ~$500,000 |
| ~6.9% | ~$250,001 - ~$500,000 | ~$500,001 - ~$1,000,000 |
| ~6.99% | Over ~$500,000 | Over ~$1,000,000 |
Connecticut Income Tax Surcharge
Connecticut imposes an additional surcharge on higher-income taxpayers that can increase the effective rate:
- ~10% surcharge on tax for single filers with CT AGI over ~$200,000
- ~10% surcharge for joint filers with CT AGI over ~$400,000
- The surcharge effectively increases the top rate to approximately ~7.69%
Combined Federal and Connecticut Capital Gains Tax
| Scenario | Federal Rate | CT Rate (with surcharge) | Combined Rate |
|---|---|---|---|
| Long-term, ~15% federal bracket | ~15% | ~6.99% | ~21.99% |
| Long-term, ~20% federal bracket | ~20% | ~7.69% | ~27.69% |
| Long-term + NIIT (~3.8%) | ~23.8% | ~7.69% | ~31.49% |
| Short-term, ~37% federal bracket | ~37% | ~7.69% | ~44.69% |
Connecticut residents can face combined rates exceeding ~31% on long-term capital gains and exceeding ~44% on short-term gains.
How Connecticut Taxes Capital Gains
Starting Point
Connecticut begins with federal adjusted gross income, which includes all capital gains. The state then applies its own modifications, but capital gains receive no special treatment. Both short-term and long-term gains are taxed at ordinary income rates.
Capital Loss Treatment
Connecticut follows federal rules for capital losses:
- Losses offset gains dollar for dollar
- Net capital losses can offset up to ~$3,000 of ordinary income
- Unused losses carry forward indefinitely
Pass-Through Entity Tax
Connecticut has a mandatory pass-through entity (PTE) tax that affects business owners. Pass-through entities (S corps, partnerships, LLCs) must pay a ~6.99% entity-level tax on Connecticut-sourced income. Owners receive a credit against their individual tax for PTE taxes paid. This can be beneficial as it effectively allows a deduction of state taxes at the entity level, bypassing the federal SALT cap.
Connecticut vs. Neighboring States
| State | Capital Gains Rate (Top) | Surcharges | Combined Top Rate |
|---|---|---|---|
| Connecticut | ~6.99% | ~10% surcharge | ~7.69% |
| New York | ~10.9% | NYC adds ~3.876% | ~14.776% (NYC) |
| Massachusetts | ~9% | None | ~9% |
| New Jersey | ~10.75% | None | ~10.75% |
| Rhode Island | ~5.99% | None | ~5.99% |
| New Hampshire | ~3% (div/int only) | None | ~3% (limited) |
Connecticut’s capital gains rate is lower than New York, New Jersey, and Massachusetts, making it relatively competitive within the Northeast. Rhode Island and New Hampshire offer lower rates.
For the full comparison, visit our state income tax rates comparison.
Strategies for Reducing Connecticut Capital Gains Tax
Qualified Small Business Stock (QSBS) Exclusion
Under IRC Section ~1202, gains from the sale of qualified small business stock held for at least ~5 years may be eligible for exclusion from federal tax. Connecticut conforms to this exclusion, potentially eliminating state tax on qualifying gains.
Installment Sales
Spreading the gain from a large asset sale over multiple years through an installment sale can keep income in lower brackets and reduce the surcharge impact.
Opportunity Zone Investments
Connecticut has designated Opportunity Zones where capital gains can be invested for deferral and potential exclusion benefits at both federal and state levels.
Tips for Managing Connecticut Capital Gains Tax
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Plan for the surcharge. The ~10% surcharge on higher incomes effectively raises your rate from ~6.99% to ~7.69%. If your income is near the surcharge threshold, consider deferring income or accelerating deductions to stay below it. See our federal income tax guide.
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Use the PTE tax strategically. If you own a business structured as a pass-through entity, the mandatory PTE tax creates a workaround for the federal SALT deduction cap. The entity-level tax is deductible on the federal return, providing a benefit that individual-level state taxes cannot.
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Harvest losses aggressively. Given Connecticut’s high rates, every dollar of realized loss saves approximately ~$0.07 in state tax (plus federal savings). Review your portfolio for loss-harvesting opportunities, especially in December.
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Use tax-advantaged accounts. Maximize contributions to 401(k), IRA, and Roth IRA accounts to shield investment growth from both federal and Connecticut taxes. Roth accounts are especially valuable because withdrawals are tax-free at both levels.
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Consider timing of asset sales. If you are planning to relocate from Connecticut, selling appreciated assets after establishing residency in a lower-tax state can save ~7% or more in state taxes. Be prepared for Connecticut to scrutinize your residency change. Our self-employment tax guide covers additional planning.
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Explore the QSBS exclusion. If you are a startup founder or early investor in a qualifying small business, the QSBS exclusion can eliminate taxes on gains up to the greater of ~$10 million or ~10 times your basis.
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Make estimated tax payments. Large capital gains can trigger underpayment penalties. If you realize a significant gain during the year, make an estimated payment to Connecticut by the next quarterly due date using Form CT-1040ES.
Key Takeaways
- Connecticut taxes capital gains as ordinary income at rates up to ~6.99%, with a surcharge that can push the effective rate to approximately ~7.69%.
- Combined federal and Connecticut capital gains tax can exceed ~31% for high-income taxpayers with long-term gains.
- Connecticut’s rate is lower than New York, New Jersey, and Massachusetts, making it relatively competitive within the Northeast.
- The mandatory pass-through entity tax provides a valuable workaround for the federal SALT deduction cap.
- Tax-loss harvesting, QSBS exclusions, and tax-advantaged accounts are key strategies for reducing capital gains tax exposure.
- Capital losses offset gains dollar for dollar, with up to ~$3,000 deductible against ordinary income annually.
Next Steps
- Federal Income Tax Guide 2026 — Understand federal capital gains rates and the NIIT.
- State Income Tax Rates Comparison 2026 — Compare Connecticut’s rates with all states.
- Tax Bracket Calculator — Model your combined federal and Connecticut tax liability.
- Find a CPA Near You — Get expert help with Connecticut capital gains planning.