38.3 Pass-through K-1 and Owner Basis Workpaper

Read the K-1 as a Workpaper Index

A Schedule K-1 connects an entity return (Form 1065 for partnerships, Form 1120-S for S corporations) to an owner's return. For REG, treat it as an index, not as one income line. The K-1 reports what the entity computed, but the owner still applies basis, at-risk, passive activity, and individual limitations. IRS instructions warn that the K-1 capital account is based on entity books and is not a substitute for calculating the owner's adjusted tax basis.

K-1 Routing Table

Order of Basis Adjustments

The ordering rule is tested. For both partners and S corp shareholders, increase basis for contributions and income items first, then decrease for distributions, then decrease for nondeductible expenses, then decrease for deductible losses last. Distributions come before losses; this prevents a distribution from being taxable when a loss has already zeroed out basis.

Partnership Outside Basis Drill

Partner A starts with 28,000 outside basis. During the year A contributes 6,000 cash, receives a K-1 with 14,000 ordinary income and a 3,000 charitable contribution, receives a 20,000 cash distribution, is allocated 1,000 nondeductible expenses, and A's share of partnership liabilities rises 8,000.

The charitable contribution is separately stated even though it reduces basis; do not net it against ordinary income. The liability increase raises outside basis because partnership debt is allocated to partners under Section 752, a rule unique to partnerships.

Partnership Loss Limit Drill

Partner B starts with 12,000 outside basis, takes a 2,000 cash distribution, has a 4,000 decrease in liability share, and is allocated an 18,000 ordinary loss. Basis before the loss is 6,000 (12,000 minus 2,000 minus 4,000). Only 6,000 of the loss passes the basis hurdle; the remaining 12,000 is suspended until basis is restored, absent separate at-risk or passive facts.

S Corporation Basis Drill

Shareholder C starts with 22,000 stock basis and 5,000 direct loan basis. The K-1 shows 9,000 income, 12,000 distributions, 2,000 nondeductible expenses, and a 30,000 ordinary loss.

Loss first reduces stock basis to zero, then debt basis to zero, leaving 8,000 suspended. Unlike partnerships, entity debt does not create shareholder basis just because the shareholder owns the company or guarantees a bank loan. Only a direct shareholder-to-corporation loan creates debt basis. IRS instructions direct shareholders to Form 7203 to track aggregate stock and debt basis limitations.

Review Workflow

1. Classify K-1 boxes: ordinary, separately stated, credit, distribution, and information items stay separate.
2. Build the basis rollforward using tax basis, not book capital.
3. Apply loss hurdles in order: basis, then at-risk, then passive activity, then excess business loss.
4. Tie back to the return: allowed amounts reach the 1040; disallowed amounts carry forward. When the question asks what appears this year, suspended losses and separately stated items are usually the key.

Distributions and the Order Trap

Watch how a cash distribution interacts with basis. A partnership cash distribution is tax-free only to the extent of outside basis; an excess is capital gain. Because distributions are subtracted before losses in the ordering rule, a partner with low basis who takes a large distribution can have a fully taxable distribution and a simultaneously suspended loss. For an S corporation, distributions from a corporation with no accumulated earnings and profits are tax-free up to stock basis, then capital gain. Distributions reduce stock basis but never debt basis, and they are taken before the loss in the ordering sequence.

Why the Partnership and S Corporation Rules Diverge

The single most tested distinction is liability allocation. Under Section 752, partnership recourse and nonrecourse liabilities flow into each partner's outside basis, so partners can deduct losses funded by entity borrowing. S corporation shareholders get no basis from corporate-level debt; a 100% owner who personally guarantees the corporation's bank loan still has zero debt basis until the guarantee is actually called and paid. This is why an identical economic loss can be deductible for a partner but suspended for a shareholder.

Restoration also differs: suspended S corporation losses survive only while the shareholder owns stock, whereas a departing partner's suspended losses interact with the disposition rules.

Form 7203 and Documentation

Since tax year 2022, an S corporation shareholder must attach Form 7203 to the individual return whenever they claim a loss, receive a non-dividend distribution, dispose of stock, or receive a loan repayment. The form formalizes the stock-basis and debt-basis rollforwards shown above. A REG simulation may give you the prior-year ending basis and ask for the current allowed loss; the answer is whatever survives the basis and debt-basis limits, with the rest carried forward.