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Schedule K-1 (Form 1120-S) - Loss Limitations
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While the at-risk limitations are calculated on IRS Form 6198 At-Risk Limitations and the passive activity limitations are calculated on IRS Form 8582 Passive Activity Loss Limitations, there is not an IRS form for the potential limitations on the amount of corporate losses that you may deduct based on your basis in the corporation. You would need to enter only the loss allowed on Line 1 of Schedule K-1 (Form 1120-S), and then manually track the shareholder basis and the amount not allowed in the current year which could be carried forward to the time when the basis in the S Corporation allows the loss to be taken.

Per IRS Shareholder's Instructions for Schedule K-1 (Form 1120-S) Shareholder's Share of Income, Deductions, Credits, etc. (For Shareholder's Use Only), page 3:

Limitations on Losses, Deductions, and Credits

There are potential limitations on corporate losses that you can deduct on your return. These limitations and the order in which you must apply them are as follows: the basis limitations, the at-risk limitations, and the passive activity limitations.

To navigate to the Worksheet for Figuring a Shareholder's Stock Basis:

Online Navigation Instructions
  1. From within your TaxAct Online return, click the Tools dropdown, then click Forms Assistant.
  2. Click + next to the Worksheets manila folder (if it is not already expanded).
  3. Scroll down to where Schedule K-1 Shareholder Basis and the other Schedule K-1 forms are listed. Click any of the forms that you need to edit, and they will appear in Forms View or Q&A (depending on the form).
  4. If an Unable to open form directly pop-up appears, it will have a list of forms that you still need to enter your data into first.
Desktop Navigation Instructions
  1. From within your TaxAct Desktop return, click Forms in the options bar.
  2. Click Federal from the dropdown in Forms Explorer, then click the Worksheets dropdown (if it is not already expanded).
  3. Scroll down to where Schedule K-1 Shareholder Basis and the other Schedule K-1 forms are listed. Click any of the forms that you need to edit, and they will appear in Forms View.
  4. If an Unable to open form directly pop-up appears, it will have a list of forms that you still need to enter your data into first.

Note that any link in the information above is updated each year automatically and will take you to the most recent version of the webpage or document at the time it is accessed.