IP 2005(31)

Q & A:  The Connecticut Alternative Minimum Tax

1. What is the Connecticut alternative minimum tax?  The Connecticut alternative minimum tax is a tax imposed on certain individuals, estates, and trusts in addition to the regular Connecticut income tax.  The tax is computed on the lesser of 19% (.19) of the adjusted federal tentative minimum tax, or 5.5% (.055) of the adjusted federal alternative minimum taxable income.

2. Who is subject to the Connecticut alternative minimum tax? You are required to file Form CT-6251, Connecticut Alternative Minimum Tax Return – Individuals, if either of the following conditions is true for the taxable year:

• You were a Connecticut resident or part-year resident and had a federal alternative minimum tax liability; or
• You were a Connecticut nonresident with a federal alternative minimum tax liability and you had Connecticut-source income.

If you meet one of the conditions above, you must file Form CT-6251, even if your Connecticut alternative minimum tax is zero.  Certain individuals may be required to file federal Form 6251, Alternative Minimum Tax – Individuals, even though they do not have to pay the federal alternative minimum tax.  These individuals are not subject to the Connecticut alternative minimum tax and are not required to file Form CT-6251.

Any trust or estate liable for the federal alternative minimum tax must complete Form CT-1041, Schedule I, Connecticut Alternative Minimum Tax Computation of Trusts or Estates.  The information discussed in this publication applies primarily to individuals. See Form CT-1041, Schedule I for information and filing requirements for the Connecticut alternative minimum tax for trusts and estates.

3. How do I compute the Connecticut alternative minimum tax? You must first complete federal Form 6251 before completing Form CT-6251.  You will use figures from federal Form 6251 in completing your Form CT-6251.

The Connecticut alternative minimum tax is computed in the following manner:

• Calculate your adjusted federal alternative minimum taxable income by adding or subtracting Connecticut modifications (if any) to your federal alternative minimum taxable income.  Use your adjusted federal alternative minimum taxable income to recalculate your allowable exemption and the tentative minimum tax.
• If you completed Part III of federal Form 6251, complete Part II of Form CT-6251. 
• Calculate the Connecticut minimum tax.  The Connecticut minimum tax is the lesser of:
  • 19% (.19) of the adjusted federal tentative minimum tax; or
  • 5.5% (.055) of the adjusted federal alternative minimum taxable income.
• Nonresidents or part-year residents only:  Allocate the Connecticut minimum tax based upon the percentage of income from Connecticut sources.
• Subtract your Connecticut income tax from the apportioned Connecticut minimum tax. The difference (if greater than zero) is your net Connecticut minimum tax.
• Residents or part-year residents only who paid alternative minimum tax to a qualifying jurisdiction on income that is taxed by both Connecticut and that jurisdiction:  Calculate your allowable credit on Form CT-6251, Schedule A, Credit for Alternative Minimum Tax Paid to Qualifying Jurisdictions. Part-year residents may only claim a credit against the net Connecticut minimum tax liability for alternative minimum tax paid to a qualifying jurisdiction on items of income, gain, loss, or deduction attributable to that jurisdiction during the period of Connecticut residency. 

• Subtract your credit for alternative minimum tax paid to qualifying jurisdictions (if any) from the net Connecticut minimum tax. The result is your Connecticut alternative minimum tax.
• If you are required to file Form CT-6251, you must complete Form CT-6251 and attach it to your Form CT-1040, Connecticut Resident Income Tax Return or Form CT-1040NR/PY, Connecticut Nonresident or Part-Year Resident Income Tax Return, even if your Connecticut alternative minimum tax is zero.