Death and the final year
Final K-1 for a deceased partner: one year, two returns, one reconciliation
When a partner dies mid-year, the partnership issues two K-1s for one interest: one final, one to the estate. Each is correct on its own. The mistake is treating either as the whole year, and the fix is a single addition.
These files reach a small firm in a bad week, and they are usually assembled by whoever was named executor, not by an accountant. The K-1s arrive months apart. The first is keyed into the final return because that return is due, and by the time the estate's K-1 arrives nobody connects the two documents to the same shareholder slot.
Who gets what
Three periods, and only two of them have a form
| Period | Taxpayer | Return | What lands there |
|---|---|---|---|
| Up to the date of death | The decedent | Form 1040, final return | The K-1 is marked final and carries the share allocated to the period before death. |
| After the date of death | The estate or trust | Form 1041 | A separate K-1 is issued to the estate, in the estate's name and with the estate's identifying number. |
| The year as a whole | Nobody in particular | A reconciliation you build | The two K-1s describe one economic year for one interest. Nothing on either document says the two add up; that is your job. |
The check: the two K-1s have to make one year
Take the final K-1 and the estate's K-1 and put them side by side, one line per box. Add the two amounts for each box and compare the total with the partner's share for a full year — which you can get from the partnership, from the prior year's K-1 as an order of magnitude, or from the partnership's schedule of partners if the firm prepares the entity return too.
What you are looking for is not equality. A year split mid-stream will not produce the same total as a full year with the same activity, because income is not uniform across twelve months. What you are looking for is a total in the right neighbourhood, with no box on one K-1 that has no counterpart on the other and no other explanation. A box that appears on the final K-1 and disappears entirely on the estate's K-1 is the shape of an income item that fell between the two.
Then check the direction: nothing dated after the death belongs on the final 1040, and nothing dated before it belongs on the 1041. Where the partnership allocated by proration rather than by closing the books, that test cannot be applied line by line, and the file should say so rather than leave the next preparer to infer it.
The basis reset, which the K-1 cannot show
The decedent's outside basis schedule ends at the date of death. The estate's begins from a basis measured at that date, not from the decedent's closing figure. Nothing on either K-1 announces this, and a schedule that carries the old closing balance into the estate's first year will understate or overstate every loss the estate takes afterwards.
Write the reset explicitly: closing basis of the decedent, date of death, basis of the interest at that date, and the source of the valuation. That last column is what makes the number defensible when the estate is examined two years later and the valuation is the only thing anyone argues about.
Small things that decide whether this file is clean
- The name on the second K-1. It should be the estate, with the estate's identifying number. A K-1 in the decedent's name for a period after death is a document to send back, not to key.
- A K-1 that keeps arriving in later years. The partnership was not notified, or notified late. The instructions are explicit that a corrected K-1 should be requested; the file should show that request.
- A section 754 election at the entity level. Where the partnership has one, the estate's K-1 reflects inside basis adjustments and will not look like a simple continuation. That is expected, and it is worth a note on the worksheet so it is not treated as an error next year.
- The final K-1 for a living partner. The same checkbox appears when an interest is sold or liquidated. The reconciliation is different — there is a sale to account for — but the habit of pairing the check with the surrounding documents is the same.
Both K-1s should be read with their pages preserved, which is what the CSV reading step keeps: the final flag, the year, and a page reference on every value. The basis rollforward is where the reset belongs.
Plain answers
Questions about a final K-1
What does the Final K-1 checkbox mean?
That this is the last K-1 the partnership will issue to that partner for that interest. On a deceased partner's K-1 it is the marker that tells you the year has to be divided. A checked box on a living partner's K-1 usually means the interest was sold or liquidated, and the same diligence applies.
Does the partner's basis step up at death?
Generally yes, for the heir. The interest takes a basis measured at the date of death, which means the decedent's accumulated basis stops mattering and the estate starts from a new figure. The final K-1 does not show that new figure, and carrying the decedent's closing basis forward is one of the more durable errors in a small firm's files.
The K-1 still arrives in the decedent's name. Should I use it?
No. A K-1 issued to a person who has died is a K-1 issued to the wrong taxpayer. The partnership instructions say to notify the partnership and ask for a corrected schedule. In the meantime the estate's own return cannot be built from a document that names the wrong recipient.
How is the decedent's share for the year divided?
The partnership decides how to allocate, and the two common approaches are an interim closing of the books at the date of death and a proration of the year's items. Which one was used is not always stated on the K-1, and it is worth asking, because it explains why the two K-1s do not split at a simple proportion.
Does K1 FastTax read the final K-1 flag?
Yes. The final K-1 checkbox is exported as its own field, so a folder can be sorted into final and non-final K-1s before anything is keyed. The division of the year between two returns is a computation, and this product does not perform it.
Sort the folder by version before you key it
K1 FastTax reads the final and amended checkboxes from every K-1 in a batch into their own fields, so the decedent's final K-1 and the estate's K-1 can be told apart before anything reaches a return.