the 1099-B can never be correct because the broker never gets the info to track tax basis. read the cover letter and the supplemental sales schedule that accompanied the K-1.
to avoid doubling up on reporting only the ordinary income portion is reported in the k-1 sales schedule. This flows only to form 4797 if there is 751/ordinary gain reported. Not every PTP has this type of income. Then you use the sales schedule to figure your tax basis to report in schedule D/8949.
in my opinion the cost basis reported in the link is wrong. it should be 8231+ 4341 =12572
I use this as a shortcut method on schedule D/8949 because basis on the 1099-B is in the sections/types B and/or E meaning tax basis is not reported to the IRS.
admittedly the 8949 instructions say do it this way: report cost basis as $8231 (column E of 8949 from column 6 of sales schedule) and then if tax basis reported is wrong use code B enter $4341 as the adjustment (thus reported tax basis is the $12572 and the capital loss is $1936
put another way the total gain is the $10636 sales price from the 8949 column d less the tax basis $8231 from column 6 of the sales schedule for an overall gain of $2405. this has two components: ordinary income of 4341 and capital loss of 1936
