QBI (Qualified Business Income) is the net amount of qualified items of income, gain, deduction and loss from any qualified trade or business, including income from partnerships, S corporations, sole proprietorships, and certain trusts.

Previously disallowed QBI is the amount of the deduction that was disallowed in prior years due to things like total taxable income limitations. 

Form 8995-A, the form used to calculate the Qualified Business Income Deduction, including the QBI that was disallowed in prior years and the current year which can be carried forward to future years, has not yet been approved for filing by the IRS. The expected date this will be approved by the IRS is 2/5/2020.

The state and federal governments approve the most common forms first and work their way down the list. Please see the links below for updates on form availability.  Once released, Turbo Tax will work quickly to get it working in the program. Form 8995-A is near the bottom of the federal list. 

Federal form availability

State form availability

Is the Qualified Business Income.  What I do not understand is why will disallowed my K1 income.

If you have a K1 issued from a 1120S Corp, look in Box 17 to see if there is a code V an an amount next to it.

OK, then what do I do to complete the manual calc for QBI deduction. Most of my numbers are o.oo ,but Turbo tax won't let ,me use 0.00

I am having this exact same issue. Why can't I use 0???

@DaveF1006 My K1 issued from a 1120S Corp Box 17 has code V and an amount. I enter that amount and finish. When the review of my return happens, it gets tripped up on the previously disallowed QBI. I enter 0. It does not accept that. My K1 issued from a 1120S Corp does not provide an amount for previously disallowed QBI. Help!

Also can't use Zero.. frustrating

@zam 

Found this on a different thread and IT WORKED!

In the "Describe Your Partnership" section when you edit your K-1, there are 5 checkboxes. By default the "All of my investment in the activity is at risk" is checked. Originally I unchecked it, but after refilling out this section I left it checked and had no issues.

@navg tax 

Found this on a different thread and IT WORKED!

In the "Describe Your Partnership" section when you edit your K-1, there are 5 checkboxes. By default the "All of my investment in the activity is at risk" is checked. Originally I unchecked it, but after refilling out this section I left it checked and had no issues.

Thanks, I tried it too and it worked !!!   WOOOHOOO!

Done with taxes.

Thank you!  This was the only answer that worked for me!

I also cannot get it to work with 0, so I tried checking the "All of my investment in the activity is at risk" box as suggested but that did not work.  Do you have to uncheck all of the other boxes?

I actually did select the all risk box only and it still did not work.  Help?

Tried it. didn't work for me