CT-1120A-CU: Apportionment Computation for Combined Unitary Filers (Revision 2024-12)
Connecticut · Connecticut DRS · Used for tax years 2024
Form CT-1120A-CU calculates net income and minimum tax base apportionment for Connecticut combined unitary filers. It reports members’ Connecticut and everywhere receipts, intangible assets, and tangible property to determine each taxable member’s apportionment.
Who files this form
Combined unitary filers use Form CT-1120A-CU to calculate each taxable member’s apportionment fraction for the net income and minimum tax bases. Complete it and attach it to Form CT-1120CU.
- Net income: The group may apportion its net income if any member does business outside Connecticut or is a financial services company as defined in Conn. Gen. Stat. § 12-218b.
- Minimum tax base: The group may apportion its minimum tax base if any member does business outside Connecticut.
Each taxable member calculates its own apportionment fractions.
What you'll need
Have these forms and details available:
- Form CT-1120CU, which this form must be attached to.
- Form CT-1120CU-MI, for each member’s member number, plus each corporation’s name.
- The designated taxable member’s Connecticut tax registration number.
- Each taxable and nontaxable member’s Connecticut receipts and everywhere receipts for Schedule Q.
- Average monthly net book values of intangible assets and tangible property for Schedule S, including Connecticut and everywhere amounts as applicable.
- The portion of the group’s income year that a part-year member was included in the group, for prorating its asset values.
- Form CT-1120CU-NI and Form CT-1120CU-MTB, where the calculated fractions must also be entered.
How to file
Complete Form CT-1120A-CU and attach it to Form CT-1120CU.
- Enter each taxable member’s Schedule Q, Line 10 fraction on Form CT-1120CU-NI, Part III, Line 4, in the appropriate column.
- Enter each taxable member’s Schedule S, Line 8 fraction on Form CT-1120CU-MTB, Line 8, in the appropriate column.
The supplied text does not give a mailing address or e-filing directions.
Common mistakes
- Including receipts from transactions within the group. Eliminate receipts from transactions among combined group members when calculating net income apportionment.
- Including special-apportionment receipts on Schedule Q. Exclude receipts from activities whose net income is subject to special apportionment.
- Including sales of property not held primarily for sale to customers. The Schedule Q instructions exclude these receipts from Lines 1, 4, and 8.
- Including excluded stockholdings or internal transactions in Schedule S. Exclude holdings of stock of private corporations and intercorporate stockholdings. Eliminate assets and liabilities attributable to transactions between unitary group members.
- Reporting asset values for certain companies. Financial service companies, real estate investment trusts, and regulated investment companies should enter zero for both Connecticut and everywhere asset values.
Questions people ask
What does this form calculate?
It calculates each taxable member’s apportionment fraction for the net income and minimum tax bases. Combined groups are taxed on the greater of those two bases.
How are nontaxable members’ Connecticut receipts handled?
They are assigned to taxable members in proportion to each taxable member’s share of all taxable members’ Connecticut receipts. The assigned receipts are added to each taxable member’s own Connecticut receipts.
Are nontaxable members included in the group totals?
Yes. Schedule Q includes taxable and nontaxable members’ everywhere receipts. Schedule S includes both types of members’ everywhere assets, subject to the stated exclusions and zero-value rules.
How many decimal places should I use?
Carry the calculations to six places for Schedule Q, Lines 3 and 10, and Schedule S, Line 8.