Partner Basis

Partner basis is best understood as a personal scoreboard that tracks how much of the partnership is really yours, in tax terms. It starts with what you put in: contribute $10,000 to launch a multi-member LLC and your basis starts at $10,000. From there it moves every year. Your share of profit increases it, further contributions increase it, and distributions and your share of losses decrease it.

The number matters because it decides how much you can take out tax-free and how much loss you can use. Distributions are generally tax-free up to your basis; cash beyond it becomes taxable gain. Say your basis is $10,000, the LLC earns you a $15,000 profit share, and you withdraw $20,000. Basis rises to $25,000, the withdrawal brings it down to $5,000, and nothing extra is taxed. Losses work the same way in reverse: you can only deduct losses up to your remaining basis, with the excess waiting for future years.

The bookkeeping lives in the Form 1065 world. Each partner's Schedule K-1 reports a capital account, which the IRS now requires on a tax basis, so the K-1 numbers and your basis calculation should tell the same story. Because Form 1065 and the K-1s are due March 15 for a calendar-year LLC, the smart habit is logging every contribution and distribution when it happens rather than reconstructing the year each spring.

Non-resident founders meet basis questions at real moments: when partners take uneven draws, when one partner buys out another, or when the LLC winds down and makes final distributions. And while a single-member LLC owner has no partnership basis to track, the same discipline applies there, since every contribution and distribution must be reported on Form 5472 with the pro forma Form 1120 by April 15, under threat of the $25,000 penalty.