What Is K-1 Box 19 Code A? Basis, Taxable Excess, and NIIT

Box 19 Code A on your Schedule K-1 (Form 1065) reports the total cash and fair market value of marketable securities the partnership distributed to you during the tax year. The number itself is not taxable income. Whether you owe anything depends on your adjusted basis in the partnership: if the distribution is less than or equal to your basis, you pay no tax; if it exceeds your basis, the excess is a taxable gain.

What Code A Reports

The IRS instructions define Code A as “cash and marketable securities other than for services.”¹ Marketable securities are treated as money for distribution purposes and valued at their fair market value on the date of distribution.² The partnership must attach a statement identifying both the fair market value and its adjusted basis in any marketable securities distributed to you.

One boundary matters before you do any math. A decrease in your share of partnership liabilities is legally treated as a cash distribution, but the partnership reports it under Code D, not Code A.¹ Both reduce your basis. If you look only at Code A and ignore Code D, you can badly underestimate how much basis has been consumed and miss a taxable event entirely.

When the Distribution Is Tax-Free and When It Isn’t

The rule is a single comparison. Take your adjusted basis in the partnership immediately before the distribution. Compare it to the Code A amount.

If the distribution is less than or equal to your basis, the whole amount is a tax-free return of capital.² Your basis drops dollar for dollar by what you received.³ Nothing goes on your return as income.

If the distribution exceeds your basis, the portion up to your basis is still tax-free, and only the excess is recognized as gain. That gain is generally treated as capital gain from the sale or exchange of your partnership interest.⁴ Held the interest more than a year, it’s long-term and taxed at preferential capital gains rates.⁵ Held it a year or less, it’s short-term at ordinary rates.

Figuring Your Adjusted Basis

Basis is a running balance. It starts with what you put in and moves up and down every year the partnership operates.

Your initial basis generally equals the cash contributed or the adjusted basis of property contributed when you joined. From there, the tax code requires annual adjustments.⁶

Basis goes up for:

Your share of partnership taxable income and tax-exempt income
Additional capital contributions
Increases in your share of partnership liabilities⁷

Basis goes down for:

Distributions, including the Code A amount
Your share of partnership losses
Nondeductible expenses that aren’t capitalized
Decreases in your share of partnership liabilities (the Code D item)

Order Matters

The adjustments happen in a specific sequence each year, and the ordering can be the difference between a tax-free distribution and a taxable gain. First, add all positive items: income allocations, contributions, and liability increases. Then subtract distributions, including Code A. Only after that do you subtract losses and deductions, which cannot reduce basis below zero.⁶ So the distribution is measured against your highest possible basis for the year before losses eat into it.

Liabilities Are Part of the Calculation

When your share of partnership debt goes up, that increase is treated as if you contributed cash and raises your basis.⁷ When your share goes down, the decrease is treated as a cash distribution to you even though nothing landed in your account.⁸ That deemed distribution reduces basis alongside the actual Code A amount, and the combination is what determines whether you cross into taxable territory.

The Hot Assets Exception

Capital gain treatment has a catch worth knowing about before you assume the lower rate applies. If the partnership holds “hot assets” (unrealized receivables or certain inventory items), the portion of any gain attributable to your share of those assets is taxed as ordinary income, not capital gain.⁴ The K-1 instructions for Code A warn that “the amount of the distribution attributable to your share of the partnership’s unrealized receivables or inventory items results in ordinary income.”¹

Unrealized receivables cover more than unpaid invoices. The category also includes depreciation recapture items, meaning the gain the partnership would recognize on equipment, buildings, and other depreciable assets if sold.⁹ Any partnership that owns significant depreciated equipment or real estate may carry enough recapture to convert a chunk of your gain from capital to ordinary. The rate difference is worth checking before you file.

Reporting a Taxable Excess

When Code A exceeds your basis, you report the excess as a disposition of a capital asset.

Report the transaction on Form 8949 as a capital asset disposition. The “sales price” is the excess distribution. The cost basis is zero because your basis was already reduced to zero by the tax-free portion.¹⁰
The subtotals flow to Schedule D (Form 1040), where your total capital gains and losses are calculated.¹¹
If any of the gain is attributable to hot assets, that ordinary income piece is reported separately from the capital gain. The partnership should supply the numbers to make the split, but in practice you may have to ask for them.

Partners who acquired their interest in stages can have a divided holding period, part long-term and part short-term. The gain then has to be allocated across the portions based on the fair market value of each portion relative to the total interest.¹²

The 3.8% Net Investment Income Tax

A recognized gain from an excess distribution can also draw the 3.8% Net Investment Income Tax if your modified adjusted gross income exceeds statutory thresholds. Those thresholds are not adjusted for inflation:¹³

$250,000 for married filing jointly or qualifying surviving spouse
$200,000 for single or head of household
$125,000 for married filing separately

The surtax applies to the lesser of your net investment income or the excess of modified AGI over the threshold. Capital gain from a partnership distribution generally counts as net investment income. If you materially participate in the partnership’s trade or business, the analysis gets more nuanced, and the gain may be partially or fully excluded depending on what the partnership holds.¹³ For a passive investor in a limited partnership, the gain is almost certainly subject to the surtax.

Tracking Your Basis Is Your Job

The K-1 instructions are explicit that “it’s the partner’s responsibility to track and maintain the information necessary to figure their adjusted basis in the partnership.”¹ The partnership hands you the pieces each year (income allocations, distributions, liability shares), but assembling them into a running basis calculation is on you.

Most Code A problems start here. A partner who hasn’t tracked basis for several years gets a distribution, has no way to know whether it exceeds basis, and either ignores the question or guesses. The IRS can request documentation to support your calculation. Underreporting gain triggers accuracy-related penalties; overreporting means paying tax you didn’t owe.

If you’ve fallen behind, reconstruction is usually possible but tedious. You need every K-1 you’ve received as a partner, along with records of contributions, distributions, and your share of liabilities for each year. A tax professional who works with partnership returns can typically rebuild the number from those records, at a cost that scales with the number of years involved.

1
Internal Revenue Service. Partner’s Instructions for Schedule K-1 (Form 1065)
2
Office of the Law Revision Counsel. 26 U.S. Code 731 – Extent of Recognition of Gain or Loss on Distribution
3
Office of the Law Revision Counsel. 26 USC 733 – Basis of Distributee Partner’s Interest
4
Office of the Law Revision Counsel. 26 USC 741 – Recognition and Character of Gain or Loss on Sale or Exchange
5
Internal Revenue Service. Topic No. 409 Capital Gains and Losses
6
Office of the Law Revision Counsel. 26 U.S. Code 705 – Determination of Basis of Partner’s Interest
7
Office of the Law Revision Counsel. 26 USC 752 – Treatment of Certain Liabilities
8
Internal Revenue Service. Recourse vs. Nonrecourse Liabilities
9
eCFR. 26 CFR 1.751-1 – Unrealized Receivables and Inventory Items
10
Internal Revenue Service. About Form 8949, Sales and Other Dispositions of Capital Assets
11
Internal Revenue Service. Instructions for Form 8949 Sales and Other Dispositions of Capital Assets
12
eCFR. 26 CFR 1.1223-3 – Rules Relating to the Holding Periods of Partnership Interests
13
Office of the Law Revision Counsel. 26 USC 1411 – Imposition of Tax