A CPA firm's first outsourced tax season goes best when the outside team gets about 90 days of setup before live returns arrive. Spend the first month on access and agreements, the second on training with your own standards, and the third on a pilot batch, with staff and client communication running alongside.
For the 2027 filing season, which covers tax year 2026 returns, that means starting in October or early November. This guide covers the people and process side of a first outsourced tax season: the timeline, how to bring your staff along, how source documents should move and what to tell clients. The item-by-item compliance list (PTINs, e-file status and security program updates) lives in our tax season checklist for CPA firms, so this page does not repeat it.
A new preparer, onshore or offshore, has to learn your review process, your software setup, your workpaper conventions and the habits of your client base before the work comes back at the quality you expect. That learning happens either before January or during it. Teaching during peak volume means your reviewers coach and review at the same time, which is the exact pressure the firm was trying to relieve.
The filing calendar is fixed. The IRS states that individual returns are due April 15, and "if day 15 falls on a Saturday, Sunday or legal holiday, the due date is delayed until the next business day." April 15, 2027 is a Thursday. Client documents also arrive on a fixed schedule. The Instructions for Forms W-2 and W-3 for tax year 2026 say employers "must furnish Copies B, C, and 2 of Form W-2 to your employees by February 1, 2027." Most wage clients cannot send complete documents before that date, so the first full week of February is a natural go-live point, and the 90 days before it are your preparation window.
The plan below splits the 90 days into three phases of about 30 days each. Firms that start in early October finish in December and use January as a buffer. Firms starting later shift each phase forward.
If the provider is not chosen yet, choose it now and keep the evaluation short. Two or three candidates and a structured scorecard are enough; our 30-point due diligence checklist for accounting outsourcing providers gives you one. Confirm the pricing model, peak season turnaround commitments and an exit route if quality is poor after the pilot.
Then open the doors. Grant access to your tax software through whatever secure environment you use, and test that each preparer can log in, open a return and save it. Plan several business days for this, because VPN settings, licenses and multi-factor authentication usually need adjustment. Our tax software handoff checklist for offshore tax teams covers permission levels and logging. In the same month, set up one shared channel for questions and give the team read access to your task tracker.
Write down or record how your firm actually prepares a return. A generic process document will not help. Cover how source documents are organized, your file naming convention, your prep checklist, what your reviewer checks first and the mistakes your current staff make most often. This document becomes the reference the outside team uses on its own, and firms that skip it tend to answer the same questions repeatedly in February.
Next, pick 10 to 15 prior-year returns that reflect your real mix, from simple Form 1040s to returns with K-1s, multiple states, Form 1120-S or Form 1065. Have the team prepare each one from the prior-year source documents and review them as if they were live. The quality should improve visibly from the first practice return to the last. If it does not, raise it with the provider before January.
Use real but low-pressure work. Extended returns still open from the prior year make good practice because they have deadlines without peak volume. Then run a defined pilot, covered in the next section, and finish the workflow design: how documents reach the team, who assigns returns, how completed returns route to a reviewer and how rush work is flagged. Write it down before go-live so every staff member knows the routing.
A pilot is a small, measured batch that tells you whether the instructions work. Pick one or two return types with complete documents, release a fixed number and track three measures for each return:
| Measure | How to record it | What to look for |
|---|---|---|
| Review notes per return | Count of reviewer comments | A falling count across the batch |
| Turnaround | Days from release to draft in review queue | Consistency with the agreed turnaround |
| Repeat questions | Questions already answered in your process document | Gaps in the written instructions |
Fix the instructions after each batch, then widen the scope. Our guide to running a 30-day pilot outsourcing engagement explains how to set pass criteria before the pilot starts.
A firm plans to send 200 individual returns to an outside team and wants the first live batch released on Monday, February 1, 2027. Working back, a 90-day preparation window that ends on Saturday, January 30, 2027 starts on Monday, November 2, 2026, which leaves the weekend before go-live free.
| Phase | Days | Dates |
|---|---|---|
| Foundation | 1 to 30 | Monday, November 2 to Tuesday, December 1, 2026 |
| Training and practice returns | 31 to 60 | Wednesday, December 2 to Thursday, December 31, 2026 |
| Dress rehearsal and pilot | 61 to 90 | Friday, January 1 to Saturday, January 30, 2027 |
| First live batch | Go-live | Monday, February 1, 2027 |
If the firm pilots 10% of its expected volume, the pilot is 20 returns (200 x 0.10). Spread over the roughly four weeks of the dress rehearsal phase, that is 5 returns a week, a load one reviewer can check closely alongside normal January work. The holiday weeks in late December fall inside the training phase, so plan practice returns around staff time off.
The part firms most often underestimate is the internal conversation. Staff may worry about job security or about signing off on work prepared by people they have never met. Silence makes those concerns grow.
Tell the team early, ideally before the 90 days begin. Explain which work is moving out, which work stays and how roles change. In most firms the outside team takes repeatable preparation, and internal staff spend more of their time on review and on the returns that need senior judgment. Our comparison of outsourced tax reviewers and tax preparers can help you decide which tasks to delegate first and which stay with senior staff.
Practical steps that reduce friction:
Federal rules also touch staff training. The FTC Safeguards Rule, which lists "tax preparation firms" among covered businesses, tells firms to "provide your people with security awareness training and schedule regular refreshers". A first outsourced season changes how files leave the office, so a refresher before go-live is a sensible time to cover the new routes. Firms whose main concern is workload rather than setup should also read our guide on reducing busy season burnout in CPA firms.
In a traditional office, documents arrive by mail, email or portal, a staff member sorts them and a preparer picks them up. With an outside team, the whole flow has to be digital and reachable from one place.
The IRS also reminds practitioners that "protecting client data also is the law" and directs them to Publication 4557 for safeguarding practices. Setting up the folders and the release rule in the dress rehearsal phase takes a few hours and prevents a steady stream of "where is this document" questions in February.
Clients need two things from you before their documents go to an outside team: a clear explanation and, where required, a signed consent.
Treasury Regulation 301.7216-3 states that "a taxpayer must provide written consent before a tax return preparer discloses or uses" the taxpayer's tax return information. For Form 1040 filers whose information goes to a preparer outside the United States, the regulation adds that "the tax return preparer must redact or otherwise mask the taxpayer's SSN" in most cases. A consent that does not state its own duration "will be effective for a period of one year from the date the taxpayer signed the consent," so a consent signed with this year's organizer generally needs renewing for next season. Our article on Section 7216 consent for tax return preparers covers the wording.
Send the consent with the organizer or engagement packet, and pair it with a short plain-language note. The note should say that the firm is adding preparation capacity, that your CPAs still review and sign every return, how client data is secured and who the client's contact remains. Our guide to the accounting engagement letter shows where outsourcing language can sit in the letter. Any return without a signed consent stays with internal staff.
A January start still works with a smaller scope. In week one, select the provider and set up access. In week two, record short walkthroughs of your two or three most common return types instead of a full process document. In weeks three and four, run five to ten practice returns and review every one. From February, outsource only the simplest returns with complete documents and add complexity as review notes fall. Review all outsourced work through March.
Hold a debrief within two weeks of the deadline. Review returns prepared, turnaround, review notes by return type and any client issues, and compare them with the prior season. List the return types where the team struggled and use the quieter months to update the process document and run targeted practice. Extended returns are due in October, so the team keeps working while you fix the gaps; our guide to managing tax season and extensions with an offshore team covers that stretch. The second season then starts from a much better base than the first.
When should a CPA firm start preparing for its first outsourced tax season? Plan on about 90 days before the first live batch. For a go-live in early February 2027, that means starting by early November 2026, and October is better if the provider is not yet selected.
Which returns should go to the outside team first? Prior-year individual returns with complete documents are the usual starting point. They are repeatable and quick to review, so problems in your instructions show up early.
Do clients have to agree before their returns go to an outsourced preparer? Under Treasury Regulation 301.7216-3, the client must give written consent before tax return information is disclosed. For Form 1040 filers whose information goes outside the United States, the SSN generally has to be masked as well.
How should a firm review outsourced work in the first season? Review every outsourced return in the first season and track review notes per return. Reduce the review depth only for return types where notes stay consistently low.
What should staff be told before the first outsourced tax season? Tell them early which work moves out, which stays and how their roles change, and name one internal owner for the outsourced workflow. Involving the main reviewer in practice returns builds the working relationship before peak volume.
Madras Accountancy supports US CPA firms with outsourced tax preparation, review support and seasonal capacity planning. If you are planning your first outsourced tax season and want to talk through timing and scope, contact our team.
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