Guide
Tax Season Preparation Checklist for CPA Firms (2027)
A month-by-month checklist covering everything from November staff planning through May post-season cleanup. Designed for CPA firms of all sizes handling individual and business returns.
Last updated: April 2026
What are the key tax dates for 2027?
November 2026
Strategic planning month. Staff planning, software updates, engagement letter renewals, and client outreach.
- Review and finalize staffing plan for the upcoming season
- Update all tax preparation software and document management tools
- Draft and send engagement letter renewals to returning clients
- Review IRS updates and tax law changes for the 2026 tax year
December 2026
Preparation execution month. Get engagement letters signed, portals set up, and organizers ready to send in January.
- December 15: Target date for all engagement letters sent
- Set up client portal access for new and returning clients
- Pre-schedule January organizer distribution
- Send year-end tax planning reminders to clients
January 2027
Collection sprint. W-2s and 1099s are issued this month. Get organizers out immediately.
- January 3: Send client organizers and document requests
- January 15: First round of automated document reminders
- January 31: Employer deadline for issuing W-2s and 1099s
- Begin identifying extension candidates (missing K-1s, complex situations)
February 2027
Primary collection and preparation month. Most documents should be arriving.
- February 1-7: Second round of document reminders
- Mid-February: 1099-B and brokerage statements begin arriving
- Begin return preparation for clients with complete documents
- February 20-28: Third round of reminders with increased urgency
March 2027
The push. Focus on completing returns, extension prep, and final document collection.
- March 1-7: Final reminder round for outstanding documents
- March 15: S-Corp and Partnership returns due (Form 1120-S, 1065)
- March 20: Finalize extension decisions with clients
- File completed returns on a rolling basis (do not batch)
April-May 2027
Final filing push, post-season cleanup, and extension return preparation.
- April 15, 2027: Individual return filing deadline (Form 1040)
- April 15, 2027: Extension deadline (Form 4868) and estimated tax payments due
- April 16-30: Send filing confirmations, address e-file rejections
- May: Season retrospective, record retention, begin extension return prep
- October 15, 2027: Extended return filing deadline
How can technology streamline this checklist?
The biggest time sink in this checklist is document collection and client follow-up. Across the entire season, firms spend an average of 90 minutes per client on document collection alone. For a firm with 200 clients, that is 300+ hours of administrative work.
Taxhance automates the most labor-intensive items on this checklist: document request distribution, automated reminder cadences, AI-powered document classification, real-time status dashboards, and secure client communication. Instead of manually tracking which clients have submitted which documents, your team focuses on preparing returns.
Features like the compliance calendar track every date listed above and send your team proactive notifications. Document checklists ensure every client knows exactly what to submit. And role-based access keeps your team organized even during the busiest weeks.
Frequently Asked Questions
When should CPA firms start preparing for tax season?
What is the most common mistake firms make during tax season preparation?
How many reminder emails should a firm send for outstanding documents?
When is the last day to file 2026 individual tax returns?
How long should CPA firms retain tax documents?
What tools help CPA firms manage tax season preparation?
Automate the busiest parts of this checklist
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