Box 20 ยท code AJ
K-1 box 20 code AJ: the excess business loss limitation
AJ is the letter that decides how much of a loss a partner can actually use this year. The K-1 supplies a figure; the limitation is not computed there, and it cannot be.
The wording on the form is: Excess business loss limitation. Read against the year printed in the K-1 header, because the letters are reassigned between years.
Where the letter goes
Form 461, where the partner's excess business loss is determined; the disallowed amount becomes a net operating loss carryforward.
The limitation compares the partner's aggregate business income and deductions with a threshold based on filing status. Neither of those is knowable at the partnership, so the K-1 can only hand over the partner's share.
What has to be true before any of it can be claimed
- The partner's other trades or businesses are in the computation. A partner with two K-1s cannot determine the limitation from either one alone.
- The filing status is known. The threshold moves with it, which means the same figure produces a different answer for the same client in a different year's status.
- The disallowed part is recorded as a carryforward. The limitation does not destroy the loss; it moves it to a later year, and that movement has to be written down.
What the statement has to show
AJ normally prints an amount, so the risk is not a missing statement but a missing computation. The record a reviewer needs is the Form 461 result and the carryforward balance, neither of which the K-1 can supply.
What goes wrong, and the shape of it
- The AJ figure entered as the disallowed loss. It is not. It is the partner's share of the figure the limitation is computed from. Treating it as the answer disallows either too much or too little, and both look plausible.
- The carryforward dropped. The amount the limitation disallows is not gone. Without a written balance, next year's preparer starts from zero and the client loses a deduction they were entitled to.
- AJ computed from one K-1. A client with two partnerships has two AJ figures and one limitation. Adding them is not the computation either.
What the reading step does here, and what it does not
K1 FastTax reads the AJ amount and the page it came from. It does not compute the limitation, which needs the partner's other business items and filing status.
The rest of box 20 is in the full box 20 code list , and the printed wording of the box itself is on the box 20 page . This page describes where a code goes; it is not tax advice, and the Partner's Instructions for the year on your K-1 are the authority.
Plain answers
Questions about box 20 code AJ
What is K-1 box 20 code AJ?
The excess business loss limitation. It carries the partner's share of the figure used to determine how much business loss can be used in the current year, with the rest carried forward as a net operating loss.
Is the amount in AJ the loss I lose this year?
No. It is an input to a computation made on the partner's own return, where the partner's other trades or businesses and filing status are also inputs. The disallowed amount is the output of that computation, not the figure printed on the K-1.
What happens to the disallowed amount?
It becomes a net operating loss carryforward. It is available in a later year, which is why the balance has to be written down somewhere a future preparer will look.
Does AJ appear on every K-1 with a loss?
No. It appears when the partnership allocated an item that engages the limitation. A loss on box 1 does not by itself mean there is an AJ.
Read box 20 code AJ from your own K-1
K1 FastTax keeps the letter, the amount and the page together, keeps a statement reference as STMT rather than zero, and records which rows a person checked.