Your broker's cost basis is wrong. Track your real IRS-adjusted basis year over year.
When you own MLP or PTP units, your broker reports the original purchase price as your cost basis on the 1099-B. But the IRS says your real basis changes every year based on your K-1 data — distributions reduce it, allocated income increases it, and liability changes shift it further. After a few years, the gap between your broker's number and your IRS-adjusted basis can be thousands of dollars.
This tracker implements the IRS Partner's Basis Worksheet to calculate your real adjusted basis from your K-1 data. Enter 4 numbers from your K-1 each year, and the calculator does the rest — including liability allocation, loss limitations under §704(d), excess distribution detection under §731, and suspended passive loss tracking under §469(k).
Pre-configured for popular MLPs including Energy Transfer (ET), MPLX, Enterprise Products (EPD), Plains All American (PAA), and Western Midstream (WES). Also supports any custom PTP or partnership with manual entry.
Private partnership K-1? This free tracker is for publicly traded partnerships. For private LPs — syndications, funds, private programs — see basis reconstruction; if you already sold, start with Sold Your LP Interest at a Loss.
Built by Lucas Andersen — MS Finance; 20 years in asset management and institutional energy trading; builds partnership-taxation tools and basis-reconstruction workpapers. Free tier: your data stays in your browser. Premium: your data is encrypted in your browser before storage — we cannot read it.