Updated September 5, 2026. Quick answer: Only above certain income levels. Connecticut fully exempts Social Security if federal AGI is under $75,000 (single/MFS) or $100,000 (joint/HOH); above that, at most 25% of benefits can end up taxed.
Confidence note: medium. This page is scoped to Social Security taxation specifically. For the state’s full retirement-tax picture (pensions, tax rates, estate and probate), see how Connecticut taxes retirement income generally.
How Connecticut taxes Social Security benefits
| State personal income tax | Yes |
|---|---|
| Social Security treatment | Partly taxed, income-dependent |
| How it works | Under Conn. Gen. Stat. § 12-701(a)(20)(x), a filer whose federal AGI is under $75,000 (single or married filing separately) or under $100,000 (married filing jointly, qualifying widow(er), or head of household) owes no Connecticut tax on Social Security at all; above those thresholds a formula caps the taxable share at 25% of benefits. |
| Income threshold / phase-out | Full exemption below $75,000 (single/MFS) / $100,000 (MFJ/HOH/QW); a 25%-of-benefits cap applies above those levels. |
Coordinate this with your overall retirement plan
An adviser can help weigh how much of your Social Security income actually reaches you after state tax, whether the timing of other withdrawals affects that, and how it fits the rest of your plan, but that does not replace the numbers in your own return.
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Statute and sources
Governing citation: Conn. Gen. Stat. § 12-701(a)(20)(x).
Read September 5, 2026.
Related: how Connecticut taxes retirement income generally · does Connecticut tax Roth conversions? · Roth conversion taxes, all 51 jurisdictions.
General information drawn from each state’s own published statutes and revenue-department guidance, not legal, tax or financial advice. Figures and exemption amounts are current as of the date in the quick answer, are set by state law, and can change by future legislation; any pending bill named on this page is not yet law. This page cannot see your own return, which governs. We are not a law firm, a tax adviser, or a fiduciary, and this is not personalized advice.