Last updated: July 6, 2026
The payroll mistakes medical practices make are rarely obvious. They don’t surface until a wage claim, a DOL audit, or a tax notice arrives. Medical practices carry more payroll complexity per employee than most businesses twice their size. Multiple pay rates for different roles. Shift differentials. On-call pay obligations. Overtime rules that work differently for healthcare workers. And ACA compliance thresholds that sneak up on growing practices. Most small practice owners don’t have an HR department watching all of it. The front desk handles payroll between patient calls. The setup that worked at four employees quietly breaks down at twelve.
We’ve handled payroll for medical and dental practices in Illinois and Wisconsin for more than 20 years. These are the five payroll mistakes medical practices make most often, what each one costs, and what the fix looks like.
Medical Practice Payroll Mistakes at a Glance
- Misclassifying providers and clinical contractors as 1099 — back taxes, penalties, benefits exposure
- Getting overtime wrong for non-exempt clinical staff — wage claims, back pay liability
- Not paying on-call time correctly — one of the most common DOL findings in healthcare
- Skipping shift differential configuration — systematic underpayment that compounds every pay period
- Missing ACA compliance thresholds as the practice grows — IRS penalties starting at $2,900 per employee
Payroll Mistake #1: Misclassifying Providers and Clinical Contractors as 1099
Worker classification in medical practices is more complicated than most industries — and the DOL knows it.
Independent contractor relationships in healthcare can be legitimate. A physician who maintains their own practice, sets their own hours, and carries their own malpractice coverage may genuinely be a 1099 contractor. The mistake is applying that classification to people who don’t meet the test. A medical assistant who works exclusively at your clinic, follows your protocols, and works a set schedule is an employee. A part-time nurse practitioner who only works at your practice and takes direction from your supervising physician is almost certainly an employee too.
The IRS uses a behavioral and financial control test to make this determination. The Illinois Department of Labor enforces its own classification rules on top of that — with civil penalties up to $1,500 per violation. Getting it wrong means back payroll taxes, interest, and potential liability for benefits — including health insurance — for every year the misclassification continued. In healthcare, a wage and hour finding isn’t just a financial problem. It’s a retention problem.
For the IRS classification framework, see IRS guidance on independent contractor vs. employee classification.
Medical Practice Payroll Mistake #2: Getting Overtime Wrong for Non-Exempt Clinical Staff
Not everyone in a medical practice is exempt from overtime. Front desk staff, medical assistants, and phlebotomists are non-exempt under the FLSA. That means overtime applies at time-and-a-half for every hour over 40 in a workweek. The mistake is treating these roles as salaried-exempt when they don’t qualify.
To qualify for FLSA exempt status, an employee must meet both a salary threshold and a duties test. A front desk coordinator who doesn’t meet the administrative duties test is non-exempt — regardless of title. Paying that person a flat salary for weeks they work more than 40 hours creates back pay liability for every affected week.
Medical practices with rotating schedules and variable patient volume are especially exposed. When a medical assistant covers for an absent colleague and works 46 hours in a week, that overtime must be paid. The payroll system needs to track weekly hours against the 40-hour threshold and flag the overage automatically. If it doesn’t, nobody catches it — and it repeats the next time coverage is needed.
Illinois also requires non-exempt employees to receive a day of rest in every seven-day period under the Illinois One Day Rest in Seven Act. Practices with thin staffing that ask employees to cover seven consecutive days need to know this rule before scheduling it.
Medical Practice Payroll Mistake #3: Not Paying On-Call Time Correctly
On-call pay is one of the most litigated areas of healthcare payroll — and one of the most commonly mishandled in small and independent practices.
Whether on-call time is compensable depends on how much the employer restricts the employee. Under federal law, an employee required to stay on premises earns compensation for that time — they can’t use it freely. An employee who carries a phone and responds within a reasonable window typically doesn’t earn compensation. Unless call frequency is so high they can’t use the time freely at all.
The mistake practices make is applying a blanket rule. Either they pay nothing for all on-call time, or they pay a flat “on-call rate” without checking whether actual work time is compensable. When someone gets called in at midnight and works two hours, those hours are compensable at their regular rate. If they push the workweek over 40, overtime applies. A flat stipend that ignores actual hours worked creates wage liability every time someone gets called in.
Medical Practice Payroll Mistake #4: Not Configuring Shift Differentials
Most medical practices pay different rates for evening shifts, weekend shifts, or holiday coverage. The mistake isn’t in the policy — it’s in the implementation. When shift differentials exist in an employee handbook but aren’t configured in the payroll system, someone has to apply them manually every pay period. Manual adjustments get missed. They get applied inconsistently across staff. They accumulate into systematic underpayment that compounds across every affected shift until an employee notices the pattern and files a complaint.
The second problem is overtime. When a shift differential increases an employee’s hourly rate, overtime for that week must use the “regular rate of pay” — a weighted average of all compensation in the workweek. Generic payroll systems calculate overtime on the base rate only. They ignore the differential entirely. That underpays overtime on every affected week.
The fix is a payroll system configured to apply differentials automatically based on the shift recorded — not a manual adjustment field that someone has to remember. Our healthcare payroll setup on iSolved handles shift differential configuration as part of the initial setup, not as an afterthought.
Medical Practice Payroll Mistake #5: Missing ACA Compliance Thresholds as the Practice Grows
The Affordable Care Act’s employer mandate applies to businesses with 50 or more full-time equivalent employees. Cross that threshold and you must offer minimum essential health coverage to full-time staff. Fail to do so and penalties start at $2,900 per full-time employee per year. The mistake medical practices make isn’t ignoring ACA compliance. It’s not tracking FTE status carefully enough to know when the threshold is approaching.
FTE calculation under the ACA counts hours, not heads. Part-time employees contribute fractional FTEs based on monthly hours. A practice with 35 full-time employees and 20 part-timers averaging 60 hours per month has roughly 45 FTEs — closer to the threshold than headcount suggests. Add two new hires and a locum tenens physician working regular hours. The practice crosses 50 without anyone realizing it until the IRS issues a Letter 226J.
Practices that cross the threshold mid-year and don’t offer coverage face penalties for every month of non-compliance. Tracking FTE status in real time — not at year-end — is the only way to catch the crossing before it becomes a penalty. This is one of the ACA compliance services in our CorePro payroll package for practices approaching or exceeding 50 FTEs.
What This Means for Your Medical Practice
The payroll mistakes medical practices make most often don’t come from carelessness. They come from using payroll tools built for simpler businesses. Healthcare payroll has more moving parts per employee than almost any other industry. The DOL, the IRS, and the Illinois Department of Labor all enforce the rules that govern it.
Each mistake on this list is fixable. But fixing it after a wage claim or IRS penalty notice costs more — in time, money, and staff trust — than the right setup would have.
The accounting side of running a medical practice has its own structural issues. Production-based compensation, entity structure for physician owners, tax planning for practices moving from solo to group. Our sister firm Accounting Freedom works with medical and dental practices in Illinois and Wisconsin on all of it: see how they approach it here.
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Frank Fiore is the President and Visionary of Payroll Freedom, a local payroll and HR services firm serving small businesses since 1981. With more than 20 years of experience working with independent medical and dental practices, Frank specializes in healthcare payroll compliance, shift differential configuration, and the ACA administration that growing practices often underestimate.This article is provided for general informational purposes only and does not constitute legal, tax, payroll, or HR advice. Worker classification rules, overtime requirements, on-call pay obligations, and ACA thresholds vary by situation and are subject to change. Before acting on anything you read here, please consult with a qualified advisor. Reach out to Payroll Freedom for guidance specific to your medical practice.
