Business & farm

- Your starting basis is your purchase price.  The partner has given you the "Cumulative Adjustments", which is [all the stuff the partnership made you pay taxes on].  The fact that's its negative means that they not only gave you some positive INT and DIV, but also some losses as well (probably box 1, ordinary income).  You'll see those losses in forms mode, when you look at the K-1 worksheet.  Unfortunately, you don't get to use those losses until you've sold the partnership completely, or receive some offsetting income from the partnership.  But you will get them eventually.
 
- You add those together, and get your new basis.  Your sales proceeds, minus your basis, gives you your total gain/loss.

- Normally, that gain/loss is split between 'capital gain/loss' and 'ordinary gain'.  Since your ordinary gain is 0 on the sales schedule,  no need to do that.

- Did you receive a 1099-B from the broker that handled the sale?  When you enter that 1099-B you'll notice that the broker probably filled in the cost as your purchase price.  You need to correct that cost to match what you calculated above, so that your reported cap gain/loss is correct.

- On the K-1 itself, when it asks you about the sale, you'd enter 0 for sales price and 0 for basis.
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**Note also, I'm not a Tax Preparer/CPA. Just a volunteer, seasoned, TurboTax user.
Use any advice accordingly!