Schedule SK-1: Shareholder’s Massachusetts Information (2025)
Massachusetts · Massachusetts DOR · Used for tax years 2025
Schedule SK-1 reports a shareholder’s share of an S corporation’s Massachusetts income, losses, deductions, credits and property distributions. It also reports stock ownership and Massachusetts basis information.
Who files this form
Complete one 2025 Schedule SK-1, Shareholder’s Massachusetts Information, for each shareholder of the S corporation.
What you'll need
Have these forms and information available to complete Schedule SK-1:
- The shareholder’s name, taxpayer identification number, address and shareholder type.
- The S corporation’s name, federal identification number and address.
- Schedule S, for the income, loss and adjustment amounts referenced on Schedule SK-1.
- U.S. Form 1120S, Schedule K-1, line 16d, for property distributions to the shareholder.
- Stock ownership and basis information, including beginning-of-year Massachusetts basis and Massachusetts and federal adjustments for stock and indebtedness.
- Applicable withholding, estimated payment and lower-tier entity payment information, including payer identification numbers.
- Applicable credit amounts and certificate numbers requested in the Credit Section.
- For Chapter 63D reporting, the qualified income, entity-level tax reported and paid, and shareholder’s refundable credit information.
How to file
File electronically. The form states that paper returns will not be accepted.
Complete a separate Schedule SK-1 for each shareholder. Enter the shareholder and S corporation information, the shareholder’s distributive share, basis information, and applicable payment and credit information. Enter the Credit Section’s total other credits on line 4b.
For questions about electronic filing, call 617-887-6367. See the Massachusetts Department of Revenue’s electronic filing and payment requirements for more information.
Common mistakes
- Sending a paper return: The form warns that electronic filing is required and paper returns will not be accepted.
- Selecting multiple shareholder types: Item A says to fill in one shareholder type only.
- Leaving losses unmarked: The distributive-share section directs you to mark an X in the box at the left if an amount is a loss.
- Omitting the credit total from line 4b: The Credit Section directs you to enter total other credits on line 4b.
Questions people ask
Do I need a separate Schedule SK-1 for each shareholder?
Yes. The form directs you to complete one Schedule SK-1 for each shareholder.
Can I file a paper Schedule SK-1?
No. The form is e-file only and states that paper returns will not be accepted. For electronic filing questions, call 617-887-6367.
Where does the property distribution amount come from?
Line 22 uses property distributions made to the shareholder from U.S. Form 1120S, Schedule K-1, line 16d.
How do I calculate the ending Massachusetts basis shown on the form?
For stock, add lines 24a and 25a and enter the result on line 27a. For indebtedness, add lines 24b and 25b and enter the result on line 27b.
What information is requested for a disregarded entity shareholder?
Item A2 asks for the disregarded entity shareholder’s name, taxpayer identification number and entity type.