@hassle -- on your questions:
- 1250 gain would typically be 0 for MLPs. Its related to real estate transactions, so wouldn't apply unless you had something specific on your K-1 that mentioned it.
- 19A is really just for your information. It doesn't affect your tax calculation. But it is NOT equal to ordinary gain. It is strictly money (or equivalent) that has been sent to you. I find it useful to a) double check that it matches my records of cash received and b) in Part II, section L of the K-1 there's a line called "withdrawals and distributions" -- that line is the sum of 19A, plus the cost basis of any shares you sold (so that's also useful in reconciling the K-1 to your records).
As to calculating the 1099-B cost basis:
- First, your broker will only adjust your basis for the things they know about: the distributions they get and pass onto you. They don't know about all the other basis adjustments, because they don't get or want your K-1. So their reported basis is wrong and pretty useless. That's why they don't report it to the IRS.
- Your basis is your [purchase cost] + [adjustment to basis]. And your TOTAL gain is your [selling revenue] - [your basis]. But that TOTAL gain is split between Ordinary Gain and Capital Gain/Loss. So the Ordinary Gain goes into the K-1, and the Capital Gain/Loss goes into the 1099-B. But to avoid double-counting the Ordinary Gain, the "adjusted basis" you enter on the 1099-B must be adjusted to take the Ordinary Gain out. So that's why the Ordinary Gain is added to the basis, ensuring that what goes on the 1099-B is correct.
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**Note also, I'm not a Tax Preparer/CPA. Just a volunteer, seasoned, TurboTax user.
Use any advice accordingly!