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Thank you!! This is still a problem in 2026. At first I couldn't find the page you mentioned but after going through the whole state flow again I saw it. This worked!   +1 on Turbotax handling this VERY poorly on both federal and state.

sorry for your loss.   what you probably have is not in accordance with the tax laws because of the daily proration required, There was the period your father owned it, then, depending on how the account was registered, it may have been property of his estate until it was probated and then you became the owner or it could have passed directly to you.    Whether the 1099-B reflects the correct value is unknown. Regardless of whether they went through probate or not the starting point for you is the value on the date of death. Then there is the subsequent activity that may increase or decrease your basis basis. Finally you have to take into account any section 751 adjustment  line 20AB on you k-1  what you should do is go to the tax package website and look up each PTP.  for each, there should be contact info and a phone number to call  https://www.taxpackagesupport.com/      Not sure the period involved between the date of death and your date of sale. The one thing I can almost guarantee is that the 1099-B does not have the correct basis because it's never informed of the partnership activity, so it does not know what your yax basis was.     

Thank you for your reply and for the work-around option. I went ahead and entered zeroes in columns A, B, & C for months that we were not eligible for PTC. That allowed me to complete the return and file it electronically, but I am concerned that - even though it looks like the tax was calculated correctly - because my return doesn't match my actual 1095-A, I will be at a higher risk for audit or delay in my refund being processed.    It is frustrating that TurboTax is supposed to make my tax filing easier but, instead, I had to spend hours researching the issue, trying to figure out why I wasn't able to enter my 1095-A accurately and, in the end, had to use a work-around that increases my likelihood of having my refund delayed.  There are literally tens of questions about this issue in the community going back months.    Why wasn't an update put through to fix this known software issue?

This may warrant a one on one with a tax professional to help you navigate the "correct" gain or loss: As noted by @M-MTax when you inherited the PTP interest, you receive a step-up in the basis equal to the FMV at the date of death of the original owner. Determining this FMV at the date of death should be fairly straight forward since the PTP's are traded on the market.  This figure becomes your beginning tax basis. Make sure you maintain your documentation for your beginning basis; FMV price of the PTP Taxpayer's have the initial burden of proof  You would then adjust this tax basis by the applicable lines on the final K-1. This figure then becomes your "cost" basis (also your tax basis) when asked for this in TT. Your selling price is obviously what you received when you sold the PTP interest. Your holding period on inherited property would include the time owned by the decedent; so most likely LTCG. The "basis" reported on the K-1 most likely has not been stepped up by the PTP The information included with the K-1 may reflect some ordinary income recapture.  This will result in some recharacterization of your overall gain or loss.  TT will also ask for this information. This recharacterization could change your loss (which you noted using the stepped up basis) As an example, if you determine your loss to be $1,000, but there is $200 of ordinary income recapture, you will report the $200 of ordinary income recapture (should be reflected on form 4797) and then have an overall loss of $1,200; which nets to the $1,000 loss. I would recommend you use the 1099-B and net that to zero; to avoid double reporting of any gain / loss.  See next bullet. Then when reporting the final K-1 information in TT, the software will ask for the information noted above.  This information will then transfer appropriately to the form 8949 and Schedule D and only report the gain / loss once. Partnership tax becomes difficult very quickly as noted above.  Depending on the $$ involved, as noted earlier, you may want to meet with a tax professional to make sure you arrive at the correct overall gain / loss.

To enter, edit or delete a 6 digit IP PIN Click on Federal Taxes (Personal using Home and Business) Click on Other Tax Situations Scroll down to Other Return Info On Identity Protection PIN, click the start button

Please review your marital status under My Info. After checking "Plan to file separately or as Head of Household", the next page should ask for more info on your spouse. This is the page where you check the box for "I didn't live with XXXX at any time between July 1, and December 31," which checks Box 6b on Form 1040.     If you don't see this page, change your filing status back to Married Filing Jointly and complete the interview for this topic until all questions have been answered. Log out of TurboTax then log back in.    Return to My Info and edit your section to change your filing status to MFS. The questions about your spouse should appear, allowing you to confirm your entry. You will need to review other sections of My Info that you may have changed before.   If this doesn't resolve the Box 6b issue, you will probably need to file by mail.