Hiring a First Employee for a Solo Tax Practice

Angel Zhen, a CPA, EA, and holder of an MST who runs a virtual tax practice out of Pasadena, California serving real estate investors and high-income solopreneurs, described the moment in the Journal of Accountancy: a calendar that fills with scope creep and rework until no room is left for the advisory work the practice was built to do. That is the actual shape of the hiring decision for a solo tax practitioner. It is not a lifestyle upgrade or a reward for growth, but a structural response to a capacity ceiling that has already been reached.

The structural pressure that tells a solo tax practitioner it is time to hire

A solo practice does not announce its breaking point with a memo. The accumulating signs appear in a practice outrunning the person running it: projects turned away, hours stretched past what anyone would call sustainable, and billable time spent on tasks that do not require a CPA's judgment at all. Zhen's description of a calendar overrun by scope creep and rework captures what this looks like from the inside, where the work that pays the bills crowds out the work that justified starting the practice in the first place.

The profession's own data tracks this inflection point. The 2026 AICPA top-issues survey found that once a firm grows past a certain size, finding qualified staff becomes the dominant concern, while seasonality and staffing worries rank lower for smaller firms still operating solo or near-solo. That gap between how small firms and growing firms rank their worries marks a real threshold in how hiring pressure builds.

Two forces outside the practitioner's control make the timing of this decision harder to get right. The broader profession is short on qualified candidates, so a practitioner who waits for an ideal hiring moment may find the market tighter, not looser, by the time they act. At the same time, the IRS itself has become a less reliable partner in day-to-day practice: the National Taxpayer Advocate's 2025 Annual Report documented that the agency shed a large share of its workforce through 2025, and slower IRS response times push more client hand-holding back onto the preparer, which tightens the capacity ceiling from the other side. A practitioner managing a client's notice response or refund delay spends hours that used to belong to someone else, and those hours do not appear on an invoice.

None of this answers whether a given practitioner should hire today. It does establish that the pressure is structural and external, driven by client volume, staffing economics across the whole profession, and the condition of the IRS itself, not by any failure of planning on the practitioner's part.

Why the W-2 hire is not the only option

The first person a solo practitioner brings on is often not a W-2 employee at all, and for some practices the right long-term answer never is. Each alternative path carries a specific use case and a specific limit, and understanding both before committing to payroll saves a practitioner from solving the wrong problem.

Independent contractors fit project-based work with a defined scope and a clear deliverable: a preparer brought on for the peak of filing season who sets his own hours, supplies his own software, and serves other clients besides. The Intuit Tax Planning Guide for 2025-2026 frames exactly this kind of part-time or contract arrangement as a way to test fit before committing to a full-time role. Offshore outsourcing serves a different need. Firms like Madras Accountancy now build dedicated offshore teams for U.S. CPA firms, which works well for high-volume compliance work, though it brings its own retention and oversight demands that a domestic contractor relationship does not. AI automation has changed the calculus further. A report from advalorem found that purpose-built AI tools are cutting tax-return preparation time by a meaningful margin at small CPA firms, handling intake, document review, and routine compliance checks well enough to put off or shrink the need for a W-2 hire. None of this displaces the practitioner's own judgment or client relationships, but it does mean the timing of a first hire is legitimately more flexible than it was five years ago.

The contractor path has a hard boundary, and it is the one most practitioners misjudge. The IRS does not look at what the contract calls the relationship. A practitioner who sets a worker's hours, supplies the tools he uses, and directs how the work gets done has an employee, whatever the paperwork says.

Getting this wrong is one of the costliest mistakes a small employer can make. Misclassification penalties can include substantial back taxes on top of separate penalty assessments, and the Department of Labor has increased enforcement actions against businesses that misclassify workers. The safe harbor many small practices once leaned on for protection is also narrower than it used to be. IRS Revenue Procedure 2025-10 tightened the Section 530 relief that shielded employers from reclassification, now requiring consistent treatment across similarly situated workers; mixing W-2 and 1099 treatment for people doing the same job disqualifies the practice from that protection entirely. The decision rule that falls out of all this is a question of fact, not preference: if the practitioner directs how and when the work gets done and the relationship continues indefinitely, the worker is an employee, regardless of what either party intended.

The legal and administrative obligations that begin the moment a W-2 employee starts

Once the decision is made to bring on a true W-2 employee, a specific sequence of federal and state obligations begins, several of which must be in place before the employee's first day.

A practice needs a federal tax identification number for the business if it does not already have one, as this number is required for all employment tax filings, a Social Security number cannot be substituted for it, and it is free and fast to obtain through the IRS website. The practice also needs to register with the state labor department for withholding and unemployment tax purposes; the exact timing varies by state, but registration has to be done before the first payday, not after. Workers' compensation insurance is required in nearly every state starting with the employee's first day on the job, with no grace period, and the cost for office-based roles varies by state and classification. The employee has paperwork of his own to complete: Form W-4 for federal withholding, and Form I-9 to verify employment eligibility, with Section 1 completed by the employee no later than the first day of work and Section 2 completed by the employer within three business days of that start date. Every state also requires the employer to report the new hire to a state new-hire registry.

Once the employee is on payroll, a recurring compliance calendar takes over. Form 941 is filed quarterly to report federal payroll taxes, or Form 944 annually for the smallest employers. Federal unemployment tax deposits are due on their own schedule, reconciled through the annual Form 940. State unemployment tax filings follow a state-specific schedule of their own. At year-end, the employer issues a W-2 to the employee and files a matching copy with the Social Security Administration. Penalties for missing any of these deadlines are automatic and compound quickly, so most practices that have been through this transition move the calendar off a spreadsheet and onto a payroll service built to track these dates and file on time, since this is infrastructure a practice needs before the first paycheck goes out, not a detail to manage by memory in the middle of filing season.

The true cost of the hire: payroll taxes, benefits, and underbudgeted costs

The wage written on the offer letter is only the starting point for a total figure that runs meaningfully higher, and practitioners who budget against salary alone are routinely surprised by what the hire actually costs over a year.

The gap starts with payroll taxes the employer owes on top of wages. The FICA match requires the employer to pay a combined rate on wages, covering Social Security up to the annual wage base and Medicare with no cap above it. State unemployment tax adds another layer, varying by state but typically running in the low-to-mid single digits on a wage base of a few thousand dollars. Workers' compensation premiums, which vary by state and job classification, and the mandatory federal unemployment deposits add further weight, and payroll taxes alone can add a meaningful percentage on top of the base wage.

Benefits sit outside the payroll tax figure entirely and can push total compensation cost up substantially. Health insurance, a retirement plan match, and other benefits are decisions the practitioner makes separately from the tax obligations above, but they belong in the same budget line before an offer goes out.

Beyond taxes and benefits, several costs tend to surface only on an invoice or a timesheet. Recruiting through a job board or a recruiter costs money up front. Onboarding and training take real hours, usually the practitioner's own billable time, spent getting a new hire to the point where he is actually producing work rather than absorbing supervision. Turnover carries its own price. Madras Accountancy's 2026 research documents burnout-driven turnover running at a notably elevated rate across public accounting every year, and replacing a mid-level accountant can cost tens of thousands of dollars once recruiting, training, and lost productivity are added up. The talent market compounds the problem for small practices, since larger firms can outbid them on both salary and brand recognition. None of this is a reason to avoid hiring. It is a reason to get the hire right the first time, because the cost of redoing it is high enough to erase whatever the hire was supposed to unlock. Before making an offer, a practitioner should model the full loaded cost (wages, taxes, benefits, and onboarding time together) against the revenue the hire is actually expected to bring in.

Solo 401(k) and SEP-IRA eligibility for employees

Hiring a first employee does not shut down a Solo 401(k) or a SEP-IRA the day that employee starts. It starts a clock the practitioner has to act on before it runs out, and most practitioners do not realize the clock has started at all.

A Solo 401(k) is a standard 401(k) that covers only the owner, and optionally a spouse. It skips the nondiscrimination testing an ordinary employer-sponsored 401(k) requires, and Mills Wealth Advisors notes that exemption disappears the moment a non-spouse employee becomes eligible to participate. The plan is not disqualified automatically on the employee's hire date. The plan document itself controls eligibility, and a 401(k) is allowed to require up to a year of service, defined as 1,000 hours worked within a 12-month period, before an employee qualifies to join. That gives the practitioner a window, but not an indefinite one. The SECURE 2.0 Act shortened the waiting period for long-term part-time employees, and under Scarlet Oak Financial Services' account of the rule, the first employees affected are those who met the service threshold in both 2023 and 2024, so the shortened rule first takes effect in 2025. Seasonal or part-time employees who stay below the annual hour threshold do not trigger this change at all, a distinction that matters directly for a practice that staffs up only during filing season. Once an employee does become eligible, the practitioner has two paths forward: convert the plan to a standard employer 401(k), which brings Form 5500 filing, possible nondiscrimination testing, and third-party administration into the picture, or terminate the Solo 401(k) and roll the funds into an IRA, a simpler route that still requires filing Form 5500-EZ and completing a direct trustee-to-trustee rollover.

A SEP-IRA does not end when an employee becomes eligible, but it starts a clock the practitioner must act before, and most do not know the clock is running. For 2026, an employee generally becomes eligible for the owner's SEP once he has turned 21, worked for the owner in at least three of the last five years, and earned at least a minimal amount of compensation during the year, a bar Mills Wealth Advisors describes as very low. That three-of-five-years condition means even occasional seasonal help can accumulate eligibility quietly, with nobody tracking the count until the employee suddenly qualifies. Once an employee is eligible, the employer has to contribute the same percentage of compensation for that employee as for the owner. There is no version of a SEP where the owner sets aside a generous percentage of his own income and skips the employee; the percentage applies evenly across every eligible participant. That rule ties the owner's own retirement savings directly to payroll cost: the owner's contribution and what the practice owes employees move on the same dial, and the only lever available, once the employer percentage is set, is lowering what the owner is willing to contribute to themselves.

Once employees are part of the picture, a SIMPLE IRA or a safe harbor 401(k) may fit the practice better than either a Solo 401(k) or a SEP. A SIMPLE IRA lets employees make their own salary deferrals, something a SEP does not allow, and carries lighter administrative overhead than a full 401(k), in exchange for a mandatory employer match or nonelective contribution. A safe harbor 401(k) trades nondiscrimination testing for a prescribed employer contribution that vests immediately for every participant. Timing matters here as much as the mechanics. Mills Wealth Advisors notes that a new safe harbor 401(k) using a matching formula generally has to be in place at least three months before the plan year ends, which for a calendar-year plan puts the practical deadline at October 1; the nonelective version of the safe harbor plan allows more flexibility, but still requires action well before the end of the year. A practitioner who waits until an employee's eligibility date arrives to think about any of this has already missed the window to act on favorable terms.