Late K-1s: How Tax Preparers Handle Delayed Schedule K-1s
Late Schedule K-1s are one of the most common reasons individual returns go on extension. Why they arrive late, how to plan around them and how to keep clients informed.
Quick answer: Schedule K-1s report each owner's share of income from partnerships, S corporations, estates and trusts. They're often late because the entity's own return must be completed first, and many entities file extensions: calendar-year partnership and S corporation returns for 2026 are due March 15, 2027, but extended returns aren't due until September 15, 2027. Preparers should identify K-1 clients early, ask whether each entity plans to extend, and file the individual's extension with an estimated payment when K-1s won't arrive in time.
Key takeaways
- K-1s depend on the entity's return, so they inherit its delays.
- An entity on extension can issue K-1s as late as September.
- Ask about expected K-1 timing in January, not April.
- Extend the individual return and pay an estimate rather than filing without the K-1.
- Watch for amended K-1s after filing.
Why K-1s are late
A partnership or S corporation can't issue K-1s until its own return is substantially complete. Investment partnerships often wait for K-1s from the funds they invest in, creating a chain of delays. When the entity files Form 7004, it gets an automatic six-month extension, and its owners may wait months.
Key dates (tax year 2026)
| Event | Date |
|---|---|
| Partnership and S corp returns and K-1s due | March 15, 2027 |
| Individual returns due | April 15, 2027 |
| Extended partnership and S corp returns due | September 15, 2027 |
| Extended individual returns due | October 15, 2027 |
Full calendar: 2027 tax deadlines for accounting firms.
A plan for K-1 clients
- Identify them early. Flag every client with K-1s from last year's return.
- Ask in January which entities they expect K-1s from and whether any new investments were made.
- Ask entities about timing, where the client can find out, especially whether the entity plans to extend.
- Decide by early April whether to extend, based on what's arrived.
- Estimate and pay. An extension doesn't extend the time to pay. See our extension guide.
- Track arrival and finish promptly once the K-1 lands.
Should you file without the K-1?
Filing with estimated K-1 figures and amending later creates extra work and risk of mismatches. Most preparers prefer to extend and wait. If a client insists on filing, document the decision and the risk of amendment.
Amended K-1s
Like corrected 1099s, K-1s are sometimes revised after issue. If an amended K-1 materially changes the client's tax, an amended return may be needed.
Communicating with clients
Hi [Name], we're still waiting on your K-1 from [Entity]. Many partnerships file extensions, so K-1s can arrive as late as September. We'll file an extension for your return and recommend paying $[amount] by April 15 to limit interest and penalties. Please upload the K-1 as soon as it arrives: [link].
Track K-1s automatically
Correctdocs keeps each expected K-1 on the client's checklist, checks it when it arrives and keeps reminding the client until it's in, even months after April.
Correctdocs is in early access. The first 10 US accounting, bookkeeping and tax firms get a free 30-day pilot on real client requests. Request early access.
Frequently asked questions
When are K-1s due?
For calendar-year partnerships and S corporations, K-1s for 2026 are due March 15, 2027, or September 15, 2027 if the entity extends.
Can I file my taxes without a K-1?
It's generally better to file an extension and wait, paying an estimated amount by the original deadline.