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Connecticut Form CT-1040 (2025)

Your 2025 federal return, carried into Connecticut as a full-year resident. Every figure is computed in your browser from the return you have already entered, and anything this engine cannot yet figure says so at the line rather than printing a number that would be wrong.

Tax year 2025ct-2025.1provisional figures

This is a hypothetical Connecticut return, so the official layout is not offered for it. A page that looked exactly like the printed form would be mistaken for one.

Federal — Form 1040

Total income0
Adjusted gross income0
Taxable income—
Total tax—

Connecticut — Form CT-1040

State income—
Taxable income—
Total tax—
Refund or amount owednot computed — not your resident state
Form CT-1040 — Connecticut Resident Income Tax Return
A working replica. Not a Connecticut Department of Revenue Services form and not for filing.
Connecticut Department of Revenue Services
Tax year 2025
Federal starting figure
Federal starting figure: blank
Additions
Additions: blank
Subtractions
Subtractions: blank
State income
State income: blank
Deduction
Deduction: blank
Exemptions
Exemptions: blank
Taxable income
Taxable income: blank
Tax before credits
Tax before credits: blank
Nonrefundable credits
Nonrefundable credits: blank
Total tax
Total tax: blank
Payments, refund and amount owed
not figured
This engine does not yet figure Connecticut’s withholding, estimated payments or settlement. Form CT-1040 has those lines; they are missing from this page, not from the form.
Worksheets and schedules behind these figures
Initial tax
Initial tax: blank
Pension subtraction
Pension subtraction: blank
Personal credit
Personal credit: blank
Phase out add back
Phase out add back: blank
Recapture
Recapture: blank
Social security subtraction
Social security subtraction: blank
Connecticut Department of Revenue Services · Form CT-1040 (2025)NOT AN OFFICIAL CONNECTICUT FORM CT-1040HYPOTHETICAL RETURN — FILER DOES NOT LIVE IN CONNECTICUT

What this Connecticut return is missing

  • The Social Security worksheet above the federal-AGI gatetoo high
    Conn. Gen. Stat. §12-701(a)(20)(B)(x) · up to 75% of the federally taxable benefit, at up to 6.99%; nil below $75,000 of federal AGI ($100,000 joint), where the full subtraction is modelled
  • Schedule 1 additions to federal AGI (line 38)too low
    Conn. Gen. Stat. §12-701(a)(20)(A) · the Schedule 1 additions a filer has, including other states' municipal interest, at up to 6.99%; nil for a wage or retirement filer with none
  • Military retirement, railroad benefits and Connecticut teachers' paytoo low
    Conn. Gen. Stat. §12-701(a)(20)(B) · the pension modification wrongly allowed on military, railroad or teachers' retirement, which Connecticut exempts under other provisions; nil for an ordinary private pension
  • The Connecticut alternative minimum tax (Form CT-6251)too low
    Conn. Gen. Stat. §12-700a · the excess of the Connecticut minimum tax over the ordinary one; nil for most filers
  • The property tax credit and the earned income tax credittoo high
    Conn. Gen. Stat. §12-704c, §12-704e · up to $300 of property tax credit a return; 40% of the federal EIC, refundable
  • Credit for income taxes paid to qualifying jurisdictions (line 7)too high
    Conn. Gen. Stat. §12-704 · the tax another jurisdiction charged on the same income; nil for the full-year resident this engine computes (ADR-0108)
  • Roth conversions, ABLE contributions and the other Schedule 1 subtractionstoo high
    Conn. Gen. Stat. §12-701(a)(20)(B) · the remaining Schedule 1 subtractions; up to $10,000 of ABLE contributions

What this Connecticut return is not telling you

  • blankct1040.base_start could not be figured.
  • blankct1040.additions could not be figured.
  • blankct1040.social_security_subtraction could not be figured.
  • blankct1040.pension_subtraction could not be figured.
  • blankct1040.subtractions could not be figured.
  • blankct1040.state_agi could not be figured.
  • blankct1040.deduction could not be figured.
  • blankct1040.exemptions could not be figured.
  • blankct1040.taxable_income could not be figured.
  • blankct1040.initial_tax could not be figured.
  • blankct1040.phase_out_add_back could not be figured.
  • blankct1040.recapture could not be figured.
  • blankct1040.tax_before_credits could not be figured.
  • blankct1040.personal_credit could not be figured.
  • blankct1040.nonrefundable_credits could not be figured.
  • blankct1040.total_tax could not be figured.