October 15 Tax Extensions: How CPA Firms Can Reduce Last-Minute Rework
Published September 15, 2026
Introduction
A return reaches review, but the final K-1 is missing. A client uploads a corrected statement after preparation is finished. Two team members follow up on the same question, while another question goes unanswered.
These are the kinds of problems that make extension season harder than it needs to be. Each one creates another round of checking, communication, and work on a return the team has already touched.
With October 15 approaching, CPA and EA firms can reduce that back-and-forth by tightening a few parts of the process: confirming which files are ready, making requests easier for clients to answer, protecting review time, and following each return through filing acceptance.
Confirm the October 15 deadline for each client
For calendar-year taxpayers with a valid, timely extension, the deadline to file a 2025 federal individual income tax return is generally October 15, 2026. The IRS explains that an extension provides additional time to file, but does not extend the time to pay. The balance was generally due April 15, 2026.
Before prioritizing the remaining returns, confirm the applicable deadline in each file. Some taxpayers qualify for different dates under disaster relief or other special rules. The IRS maintains current disaster notices identifying eligible locations and postponed deadlines. Check state requirements separately.
Record the confirmed deadline alongside your firm’s internal targets for document collection, preparation, and review. Internal targets should leave room for client questions and corrections. They are scheduling decisions, not additional IRS deadlines.
Give every return a clear status and next action
A status such as “in progress” does little to explain why a return is still open.
Consider two clients. One has supplied everything, but no preparer is available. The other is missing a partnership K-1. Both may appear in the same unfinished-return count, but they need different attention.
Use statuses that describe the actual work remaining:
- Waiting for client documents
- Waiting for third-party information
- Ready for preparation
- Awaiting a technical decision
- In review
- Awaiting client authorization
- Transmitted, awaiting acknowledgment
- Accepted
Assign one person to coordinate each return through completion. That person does not need to perform every task, but should know what is blocking progress, who is handling it, and when follow-up is due.
A brief daily review of blocked files can keep an unanswered question from sitting unnoticed for several days.
Send a complete document request before preparation begins
Before the next client reminder goes out, compare the documents received with the prior-year return and what you know about the client’s 2025 activity.
Depending on the engagement, that may mean checking for income statements, K-1s, business or rental records, basis schedules, carryforwards, and confirmation of estimated and extension payments. Prior-year information is a starting point; ask about changes that could introduce new reporting needs.
Then send a consolidated request through your firm’s secure portal. Identify the document, the relevant tax year, and when it is needed.
“Please upload the final 2025 Schedule K-1 from your partnership” gives the client a clearer task than “We still need your tax documents.”
Invite clients to flag items they cannot obtain or do not recognize. That response is more useful than silence.
New questions will still arise during preparation. Keep them in the same tracked request so the client and team can see what has been answered and what remains open.
Make the review handoff easy to follow
A reviewer should be able to understand the return without reconstructing the preparer’s work from emails and scattered notes.
Before moving a file into review, include:
- The current return and supporting workpapers
- A short explanation of significant changes from the prior year
- References supporting material figures
- Open technical questions and the preparer’s proposed treatment
- Unresolved software diagnostics
- Documentation of payments already made
Keep unresolved issues visible. If a return is ready for review except for one item, name that item and explain what depends on it.
Version control matters here, too. Designate the current working file and clearly mark superseded documents. When a corrected statement arrives, record what changed and route the affected work back through the appropriate review.
SAM’s article on scaling tax preparation workflows explores the broader connection between document collection, assignments, review, and communication. During extension season, consistent use of those processes becomes especially valuable.
Match additional capacity to the actual bottleneck
Before bringing in outside help, identify where work is accumulating.
If complete files are waiting for preparation, additional preparer capacity may help. If prepared returns are waiting for a senior reviewer, increasing preparation volume can leave an even larger review queue. If documents are missing, someone needs to resolve those requests first.
For firms considering tax outsourcing, choose assignments with a defined scope, organized records, and a realistic handoff date. Confirm who will answer questions and reserve internal time for reviewing the completed work.
SAM’s U.S.-based tax preparation and review services are one option for firms addressing a capacity gap. Under SAM’s standard tax preparation workflow, the firm remains responsible for final review, client delivery, and e-filing.
The practical question is whether the added support helps move work through the stage that is holding it up.
Track the return through e-file acceptance
Finishing preparation is one milestone. Completing the filing process requires its own attention.
Where Form 8879 is required, the electronic return originator must receive the completed, signed authorization before transmitting or releasing the return for transmission. Build time into the schedule for the client to review the return and provide authorization.
After transmission, check the acknowledgment. The IRS instructs electronic return originators to check acknowledgment records regularly and follow up on issues requiring action.
Assign responsibility for monitoring those responses and resolving rejected returns. Track federal and state results separately, and retain the filing confirmations in the client record.
If a return changes after authorization, check whether updated authorization is required before retransmission. A status marked “sent” should never be the only evidence the team relies on to close the file.
What to address this week
Start with a review of every remaining extended individual return. Each file should have a confirmed deadline, a named coordinator, a specific next action, and a realistic path through preparation and review.
Then focus on the gaps that will become harder to resolve in October: outstanding third-party documents, technical decisions, reviewer availability, and clients who have not responded.
The most useful work in September may be a clearer request, a documented decision, or a better handoff. Addressing those details now gives the team more room to finish returns carefully as October 15 approaches.
