A locum radiology tax strategy in 2026 comes down to three decisions: how you get paid (1099 versus W-2 through a staffing agency), which state you claim as your tax home, and whether an S-corp election is worth the added paperwork. Get any of the three wrong and you risk owing income tax to more than one state on the same locum earnings, plus an IRS underpayment penalty for not paying enough as you go.
- A locum radiology tax strategy hinges on entity choice, tax home, and tracking workdays by state.
- 1099 locum pay carries 15.3% self-employment tax on top of federal and state income tax.
- S-corp election only pays off once net locum income clears typical payroll and CPA costs — recheck it yearly.
- Quarterly estimated payments are due four times in 2026; missing one triggers an IRS underpayment penalty.
- States tax income where you physically read cases, so a nine-state locum year can mean nine state returns.
Why This Matters for Locum Radiologists in 2026
A locum radiologist who works assignments in six states in one year doesn't file one tax return — potentially six, plus a federal return. Each state where you're physically present reading studies, or where you hold a license tied to a facility contract, can claim taxing rights over the income earned there, regardless of where you live or bank the check.
This is separate from the pay-rate math. Before you can build a tax strategy, you need an honest true hourly rate on locum contracts that already backs out self-employment tax, state filing costs, and license fees — otherwise the tax bill shows up as a surprise instead of a planned line item.
Most locum radiology assignments run through staffing agencies as 1099 contracts rather than W-2 employment. That classification is the single biggest driver of your tax structure, because 1099 income triggers self-employment tax and shifts the recordkeeping burden entirely onto you.
How to Structure a Multi-State Tax Strategy for Locum Radiology Work
The structure has three layers, and they build on each other in order.
| Layer | What it controls | Action needed |
|---|---|---|
| Entity choice | How income is taxed federally | Decide sole prop (1099), S-corp election, or stay W-2 |
| Tax home | Which state taxes you as a resident | Establish one state as domicile with clear ties |
| Day tracking | Which states get a nonresident return | Log every workday by state, even remote reading days |
Start with entity choice because it determines your paperwork load for the whole year. A straight 1099 sole proprietor reports locum income on Schedule C and pays the full 15.3% self-employment tax on net earnings, on top of federal and state income tax. An S-corp election lets you split income between a reasonable salary (subject to payroll tax) and distributions (not subject to self-employment tax), which can lower the total tax bill — but only once net income is high enough to absorb payroll processing, a separate corporate return, and CPA fees without eating the savings.
Tax home comes next. The IRS defines your tax home as the general area of your main place of business, not necessarily where you own a house. For a locum radiologist without a single fixed job site, tax home usually gets pinned to the state where you maintain your permanent residence, vote, hold a driver's license, and return between assignments. Pick this deliberately and document it — it's what lets you deduct travel and lodging for assignments away from that base.
Day tracking is the layer most radiologists skip until a state audit forces the issue. Keep a simple log: date, state, hours worked, whether the reads were done in-person or remotely from your home state. That log is what your CPA uses to allocate income across nonresident state returns and claim credits for taxes paid to other states.
Self-Employment Tax: 15.3% on Net 1099 Locum Income
Every dollar of 1099 locum income is subject to 15.3% self-employment tax (Social Security and Medicare combined) before federal and state income tax get applied on top. A W-2 locum arrangement through an agency splits this cost with the employer, which is why some radiologists trade a lower gross rate for W-2 status specifically to avoid the full self-employment tax hit.
The S-corp election exists to blunt this. Once you're an S-corp, you pay yourself a salary (payroll tax applies) and take the rest as a distribution (no self-employment tax on that portion). The tradeoff is real cost: payroll administration, a separate 1120-S filing, and a CPA who understands physician locum structures. Below a certain income level, those costs cancel out the tax savings — which is why this decision needs a yearly re-check, not a one-time setup.
State Tax Nexus: You Owe Where You Read the Case, Not Just Where You Live
State tax nexus for radiologists is stricter than most physicians expect. Reading a case while physically sitting in a hospital reading room in another state creates taxable income in that state, full stop. Remote teleradiology reads complicate this further — some states tax income based on where the patient or facility is located, others tax based on where the radiologist is physically sitting at the keyboard, and the two rules don't always agree.
“If you cross a state line to read a case, that state can tax the income from it — your home address doesn't override where the work happened.”
This is also where maintaining multi-state licenses intersects with tax planning: a license alone doesn't create tax liability, but the physical or remote work performed under that license usually does. Nine states — Alaska, Florida, Nevada, South Dakota, Tennessee, Texas, Washington, Wyoming, and New Hampshire on wage income — don't tax earned income at all, which is why some locum radiologists structure their assignment calendar to weight time toward those states when the pay and clinical fit are comparable.
Why Locum Tax Complexity Varies
Not every locum radiologist needs the same setup. Complexity scales with a handful of specific factors:
- Number of states worked in a tax year — three states is manageable with a spreadsheet; eight or more usually justifies a CPA who specializes in multi-state physician returns.
- 1099 versus W-2 classification per assignment — mixing both in one year means different tax treatment for each income stream.
- Reciprocity agreements between states — a small number of neighboring states let residents avoid double filing; most locum radiology markets don't have this benefit.
- Income level relative to S-corp breakeven — below the payroll-and-CPA cost threshold, staying a sole proprietor is simpler and cheaper.
- Remote versus onsite read locations — teleradiology from a home state versus onsite coverage in the facility's state changes which state has the stronger nexus claim.
- Contract-end obligations — malpractice tail costs and final state filings both land in the same tax year the contract ends, which is worth planning for before you sign the exit terms.
Do You File Taxes in Every State You Work In as a Locum Radiologist?
Yes — you generally file a nonresident return in every state where you performed locum work, plus a resident return in your tax home state, which then credits taxes paid to other states to avoid double taxation. The credit isn't always dollar-for-dollar if the other state's rate is higher than your home state's, so the math still needs to be run per state.
Should You Form an LLC or S-Corp for Locum Radiology Income?
An S-corp election makes sense once your net locum income comfortably exceeds the added cost of payroll processing and a separate corporate tax return; below that line, a straight 1099 sole proprietorship or single-member LLC is simpler and just as compliant. An LLC alone doesn't change your federal tax treatment — the S-corp election is what shifts the self-employment tax math, not the entity type by itself.
Find your next locum contract
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FAQ
How much self-employment tax do locum radiologists pay in 2026?
Locum radiologists on 1099 contracts pay 15.3% self-employment tax on net income in 2026, covering Social Security and Medicare, on top of federal and state income tax. W-2 locum arrangements split this cost with the staffing agency instead.
Do I need to file a tax return in every state I work in as a locum?
Yes, in most cases you file a nonresident return in each state where you performed locum work, plus a resident return in your tax home state that credits taxes already paid elsewhere.
Is an S-corp worth it for locum radiology income?
An S-corp is worth it once net locum income clears the added cost of payroll administration, a corporate tax return, and specialized CPA fees. Below that threshold, a sole proprietorship or single-member LLC is simpler.
What is a tax home for a locum radiologist?
A tax home is the state the IRS treats as your main base — typically where you keep a permanent residence, hold a driver's license, and return between assignments. It determines which travel and lodging costs you can deduct for out-of-state assignments.
Are teleradiology reads taxed differently than onsite locum reads?
Teleradiology tax treatment depends on the state: some tax based on where the patient or facility sits, others tax based on where the radiologist is physically working. This inconsistency is why remote locum radiologists need to track both the facility state and their own physical location for every shift.
Which states have no income tax for locum radiologists?
Alaska, Florida, Nevada, South Dakota, Tennessee, Texas, Washington, and Wyoming have no earned income tax, and New Hampshire doesn't tax wages either. Assignments in these states simplify the nonresident filing side of a multi-state tax strategy.
How often do locum radiologists need to pay estimated taxes?
Locum radiologists on 1099 income generally make quarterly estimated tax payments four times a year. Missing a payment or underpaying triggers an IRS penalty, even if the full balance is paid by the annual filing deadline.
One Last Thing
The detail most locum radiologists miss isn't the state tax math — it's the timing overlap between contract end and tax year end. A contract that wraps in December but pays out in January can push income (and the related self-employment tax) into a different tax year than expected, which throws off quarterly estimates set earlier in the year. Recalculate your Q4 estimate any time a contract's payment schedule shifts, not just when you sign a new one.
