Independent Contractor vs. Employee: Tax Implications for Locum Chiropractors

When you take a coverage assignment, you're almost always operating as an independent contractor rather than an employee of the clinic. This is the same legal structure under which most physicians, attorneys, accountants, and consultants operate when they do project-based work. It's a perfectly normal arrangement — but the tax mechanics are different from W-2 employment in ways that catch new locums off guard.

This guide is not tax advice. Talk to your accountant. But it should help you understand what to expect and what questions to ask.

What "independent contractor" actually means

The IRS's definition centers on control: an independent contractor controls how and when they perform their work, while an employee is directed by an employer. In a coverage arrangement, the chiropractor:

• Sets their own techniques and patient management approach
• Maintains their own license, malpractice, and continuing education
• Is paid by the assignment, not by the hour or week
• Receives a Form 1099-NEC at the end of the year (or earns under $600 from any one clinic, in which case no 1099 is issued but the income is still taxable)

This is materially different from being an associate doctor on payroll, where the clinic withholds taxes, contributes to Social Security on your behalf, and provides employee benefits.

The self-employment tax shock

This is the most common surprise for new locums. When you're a W-2 employee, your employer pays half of your Social Security and Medicare taxes (7.65%) and you pay the other half (7.65%). When you're self-employed, you pay both halves — that's 15.3% on top of your regular income tax.

So when a clinic offers you $700/day, the gross is $700/day, but your effective tax burden on that income is substantially higher than a comparable W-2 wage. Many new locums look at $700/day and mentally bank $700/day. The actual after-tax take is closer to $450-$500/day depending on your tax bracket.

The fix is to understand this upfront and price your coverage work accordingly. Most experienced locums consider $X/day as 1099 contractor equivalent to roughly $0.65-$0.70 × $X/day as W-2.

Quarterly estimated taxes

Because no employer is withholding taxes for you, the IRS expects you to send them money four times a year. These are called quarterly estimated taxes, and the schedule is:

• Q1 payment: due April 15
• Q2 payment: due June 15
• Q3 payment: due September 15
• Q4 payment: due January 15 of the following year

If you don't pay quarterlies and end up owing more than $1,000 at tax time, the IRS charges an underpayment penalty. The penalty isn't enormous, but it's annoying and avoidable.

For most locums, the practical approach is to estimate your annual income, subtract reasonable deductions, calculate your tax liability, and send 25% of that to the IRS each quarter via IRS Direct Pay.

What you can deduct

This is where the 1099 contractor model becomes much more favorable than W-2 employment. As an independent contractor, you can deduct legitimate business expenses against your income. Common categories for locum chiropractors:

• License fees and renewal costs for each state you're licensed in
• Continuing education — courses, conferences, travel to those events
• Malpractice insurance premiums
• Professional association dues
• Travel between assignments — airfare, mileage, lodging, meals (50% deductible)
• Cell phone (business-use percentage)
• Subscriptions and software
• Home office (if you have a dedicated home office space)
• Health insurance premiums (if not on a spouse's plan)
• Retirement contributions (Solo 401(k) or SEP-IRA)

The retirement piece is especially powerful. As a self-employed DC, you can contribute up to ~$70,000/year to a Solo 401(k) in 2026, vs. ~$23,000 for an employee 401(k). For high-earning locums, this is a meaningful tax shelter.

The "shoebox" problem

Most new contractors are wildly disorganized about expense tracking, and it costs them thousands of dollars per year. You don't need fancy software, but you do need a system.

A workable minimum:

• A dedicated business checking account and credit card (use them only for business expenses)
• A simple spreadsheet or QuickBooks Self-Employed
• A folder (digital or physical) for receipts over $75
• Quarterly review with your accountant or a 1-hour self-review

Time investment: about 30 minutes per month. Annual tax savings: typically $3,000-$10,000 for active locums.

When LLC or S-Corp status starts to make sense

For locum chiropractors earning more than about $80,000/year in 1099 income, forming an LLC and electing S-Corp tax treatment can produce real tax savings. The mechanism: you pay yourself a "reasonable salary" through payroll (subject to Social Security and Medicare), and any additional profit flows through to you as a distribution (NOT subject to Social Security and Medicare).

The math gets compelling at higher income levels but the administrative cost is real — you need a payroll provider, quarterly tax filings, separate corporate tax return, etc. Most accountants suggest waiting until you're earning $80K-$100K+ in 1099 income before making the switch.

Common surprises

• No paid time off. When you don't work, you don't earn. Build a buffer fund.
• No employer-provided health insurance. Marketplace plans, COBRA, or spouse's coverage.
• No automatic disability coverage. Worth buying private long-term disability.
• Slower payment cycles. Clinics often pay 15-30 days after the assignment ends.
• State tax complications. Multi-state work means multi-state tax returns.

The bottom line

Independent contractor status for locum chiropractic work isn't bad — it's actually quite favorable for many people, especially those willing to keep clean records and use the deductions available. The trap isn't the structure itself; the trap is treating 1099 income like W-2 income and getting blindsided by tax time.

If you're new to locum work, set up the basic infrastructure (business bank account, expense tracking, quarterly estimated taxes) before your first assignment ends. A small amount of upfront effort prevents large headaches later.