Connecticut tax forms & filing.

Things to know about filing in Connecticut

• Connecticut residents who work in New York pay NY nonresident tax on those wages, and claim a Connecticut credit for taxes paid to another jurisdiction. This is the most common CT filing pattern and the single biggest source of calculation errors when handled in DIY software.
• Connecticut has a state estate tax and gift tax with thresholds lower than the federal estate tax. High-net-worth Connecticut residents need to plan for the state-level estate tax separately from federal.
• Connecticut offers a property tax credit for certain residents that requires the property tax amounts paid during the calendar year. We collect these at intake.
• Connecticut has decoupled from certain federal tax law changes in past years — we check conformity on bonus depreciation, certain retirement provisions, and SALT-related items every filing season.

Connecticut–New York commuter pattern — the most common CT filing

The dominant Connecticut multi-state filing pattern is residents working in New York City (or other parts of New York state). The mechanics: NY taxes you as a nonresident on your NY-source wages via Form IT-203, then Connecticut taxes you as a resident on your worldwide income via Form CT-1040 with a credit for taxes paid to another jurisdiction.

The credit calculation is the source of most CT filing errors. Connecticut caps the credit at the CT tax that would have applied to the same NY-source income — so if CT's effective rate is lower than NY's on that income, the credit fully offsets CT tax but you still bear the NY-CT differential.

New York's convenience-of-the-employer rule sources telecommuting wages to NY when the CT resident is working from home for a NY employer 'for convenience.' This catches many post-2020 CT-resident remote workers and is the single biggest source of CT-NY filing surprises.

Connecticut estate and gift tax — both apply

Connecticut is one of a small number of states that levies both a state estate tax AND a state gift tax. The two taxes are integrated — large lifetime gifts reduce the available estate-tax exemption at death.

Connecticut's estate-tax exemption is significantly lower than the federal threshold. High-net-worth Connecticut residents need to plan for state-level transfer-tax exposure separately from federal estate planning.

The Connecticut gift tax applies to taxable gifts in excess of the annual federal exclusion and beyond the lifetime exemption. Connecticut domicile is the trigger — we coordinate with a Connecticut estate attorney on planning and handle the return-side reporting.

Where's my refund?

The Connecticut Department of Revenue Services runs the official refund-status tracker. You'll need your Social Security number, filing status, and exact refund amount (in some cases, the tax year and a return-amount input).

Check your Connecticut refund status →

Multi-state considerations

If you lived or worked in more than one state during the tax year, you typically file a part-year resident return in each state. If you live in one state and work in another, you usually file as a resident where you live and as a nonresident in the work state — claiming a credit on the resident return for taxes paid to the work state. Reciprocity agreements between some neighboring states change this default; we map this out at intake.

Connecticut-specific multi-state nuances are addressed in the quirks list above when they apply.

Get the current-year forms

State tax rates, brackets, and forms change every year. We point to the Connecticut Department of Revenue Services as the authoritative source for current-year information. Form numbers above are stable; rates, deduction amounts, and credit limits are not — always verify before relying on a specific dollar amount.

Open the Connecticut Department of Revenue Services website →