Per diem nursing can significantly boost your income — but if you are working 1099 shifts through an agency or staffing platform, you are also picking up a tax obligation that W-2 employees never see. Getting this wrong means an IRS underpayment penalty and a surprise bill in April.
The core issue: 1099 per diem nurses owe self-employment tax on top of income tax, and nobody withholds it for you. You have to calculate it, set it aside, and pay it quarterly. This guide explains exactly how.
Quick-scan summary
| Your situation | Key obligation |
|---|---|
| Hospital employee, per diem shifts (W-2) | Nothing extra — employer withholds |
| Agency worker, 1099 income | SE tax (15.3%) + estimated quarterly payments |
| Both W-2 and 1099 in same year | Quarterly estimates on 1099 income only |
| Self-employment income >$1,000/year | Likely required to file quarterly |
| First year of 1099 work | Use safe harbor: pay 100% of prior year’s tax |
W-2 vs. 1099 per diem: the distinction that changes everything
Not all per diem work is the same from a tax perspective. How you are classified determines your entire tax situation.
W-2 per diem means the hospital or health system employs you directly, even for PRN shifts. They classify you as an employee, withhold federal and state income tax from each paycheck, and pay their half of Social Security and Medicare (FICA) taxes. You receive a W-2 in January. Your tax filing looks like any other employee’s return. The per diem pay differential (extra pay for flexible scheduling) is just income — no special treatment required.
1099 per diem means a staffing agency or platform contracts you as an independent contractor. They pay you gross — no withholding, no employer FICA contribution. You receive a 1099-NEC in January. You owe income tax on the full amount, and you owe self-employment tax on it as well. No one did this math for you. It is entirely your responsibility.
The same nurse can be in both situations simultaneously — W-2 at a primary hospital, 1099 through an agency for weekend shifts. That is common and manageable, but it means tracking two separate income streams and making quarterly payments on the 1099 side even when the W-2 income is having taxes withheld correctly.
Self-employment tax: what it is and why it is 15.3%
When you are a W-2 employee, Social Security and Medicare taxes (FICA) are split between you and your employer: each pays 7.65%. The combined rate is 15.3%, but you only see 7.65% on your pay stub.
When you are self-employed, you pay both halves. The full 15.3% comes out of your earnings. This is self-employment tax (SE tax), calculated on Schedule SE and added to your regular income tax. It is not optional and it is not negotiable.
The breakdown:
- Social Security: 12.4% on net self-employment income up to $176,100 (2025 wage base; adjusts annually)
- Medicare: 2.9% on all net self-employment income, no cap
- Additional Medicare Tax: 0.9% on net self-employment income above $200,000 (single filers) — relevant for high earners
One deduction that partially offsets this: you can deduct half of your SE tax from gross income when calculating your adjusted gross income (AGI). This does not eliminate the tax, but it reduces the income on which your federal income tax is calculated. The IRS allows this because employers’ FICA contributions are deductible as a business expense — this is the self-employed equivalent.
Reference: IRS Schedule SE instructions at IRS.gov/ScheduleSE.
Quarterly estimated taxes: who owes them and how to calculate
The IRS requires you to pay taxes as income is earned, not just at year-end. If you expect to owe at least $1,000 in federal tax after withholding and credits, you are required to make quarterly estimated payments. Most 1099 per diem nurses hit this threshold quickly.
Quarterly payment deadlines (approximate):
| Period | Deadline |
|---|---|
| January 1 – March 31 | April 15 |
| April 1 – May 31 | June 16 |
| June 1 – August 31 | September 15 |
| September 1 – December 31 | January 15 (following year) |
The safe harbor rule is the simplest way to avoid underpayment penalties. Under IRS Publication 505 guidelines, you are protected from penalties if you pay either:
- 100% of your prior year’s total federal tax liability (110% if your prior year AGI exceeded $150,000), or
- 90% of your current year’s actual tax liability
For the first year of 1099 work, the 100%-of-prior-year-tax method is usually easiest — you know that number from last year’s return. Divide it by four and pay that amount each quarter. You may still owe at filing, but you will not owe a penalty.
For the current year method, you need to estimate your income as you go. Most nurses use accounting software or a CPA for this calculation once 1099 income becomes a significant part of their earnings.
How to pay: Use IRS Direct Pay at IRS.gov or the Electronic Federal Tax Payment System (EFTPS). EFTPS is free to set up and recommended for recurring quarterly payments. You can also mail Form 1040-ES with a check, though electronic payment is faster and provides a confirmation number.
State estimated taxes follow a similar schedule in most states. Check your state’s revenue department for deadlines and calculation methods — most mirror the federal structure.
What you can deduct as a 1099 per diem nurse
Self-employed nurses can deduct ordinary and necessary business expenses from their net self-employment income. Deductions reduce the base on which both income tax and SE tax are calculated — every deductible dollar saves you both.
Home office
If you maintain a dedicated space used regularly and exclusively for your nursing work — documenting patient records, handling credentialing paperwork, completing continuing education — you can deduct it. The simplified method allows $5 per square foot, up to 300 square feet ($1,500/year). The regular method calculates actual home expenses (mortgage interest/rent, utilities, insurance) proportional to the office square footage.
Strict rule: the space must be used exclusively for business. A desk in a bedroom does not qualify. A separate room used only as your office does.
Mileage and travel
Mileage driven for business purposes — driving to per diem shift locations (when you have no regular place of business), credentialing appointments, continuing education — is deductible at the IRS standard rate (67 cents per mile for 2024; check IRS.gov for the current year rate). Commuting to a regular workplace is not deductible.
Keep a mileage log. Date, destination, purpose, miles. Apps like MileIQ or a simple spreadsheet work. Without a log, the deduction does not survive an audit.
Scrubs and uniforms
Required uniforms not suitable for everyday wear — scrubs, nursing shoes used exclusively for clinical work — are deductible. Clothing that can be worn outside of work generally is not. If your employer provides scrubs, you cannot deduct ones you purchase voluntarily.
Continuing education and licensing
Nursing CEUs required to maintain your RN license are deductible. So are state licensing fees, renewal fees, and specialty certification costs (CCRN, PCCN, etc.) — provided they maintain your existing qualifications, not meet the minimum requirements for a new career. A new NP program would not qualify; your RN license renewal does.
Professional dues and subscriptions
ANA membership, specialty organization dues (AACN, ENA), and nursing journal subscriptions used for professional development are deductible. Malpractice insurance premiums for your self-employed work are deductible.
Equipment and supplies
A stethoscope, blood pressure cuff, or other professional equipment purchased for your per diem practice is deductible. A laptop used for nursing documentation may be partially deductible if used for both business and personal purposes — you deduct the business-use percentage.
What W-2 per diem nurses cannot deduct
This matters: if your per diem work is W-2, the rules above do not apply to you.
Under current tax law (post-Tax Cuts and Jobs Act 2017), W-2 employees cannot deduct unreimbursed employee business expenses on their federal return. That includes scrubs, stethoscopes, mileage to work, and CE costs — if your employer does not reimburse them and you are a W-2 employee, they are not deductible at the federal level.
Some states still allow these deductions on state returns (California, New York, and a handful of others). Check your state’s rules separately.
If you do both W-2 and 1099 work, deductions apply only to expenses related to your 1099 income. You cannot deduct a stethoscope against your W-2 income, but you can deduct it if it is a genuine cost of your 1099 practice.
How much to set aside: the practical rule
The clean rule: set aside 25–30% of your net 1099 income for combined federal income tax and self-employment tax.
Why that range: SE tax is 15.3% of net income. Federal income tax on top depends on your bracket. For nurses earning $40,000–$100,000 in 1099 income, combined federal effective rates typically land at 20–25%. Add 5–7% for state income tax (varies significantly), and 25–30% covers most situations.
If you are in a state with no income tax (Texas, Florida, Nevada, Washington, Wyoming, South Dakota, Alaska), the 25% figure is usually sufficient for federal only.
When in doubt, save 30% and reconcile at filing. Overpaying your quarterly estimates is better than underpaying — you will get a refund rather than a penalty.
Open a separate savings account for tax reserves. Move 25–30% of every 1099 payment into it immediately. This is not an aspirational practice; it prevents the common scenario of spending tax money and having nothing left to pay quarterly estimates.
When to consult a tax professional
DIY tax preparation works for straightforward 1099 situations. Use a CPA or tax professional if:
- Your 1099 income exceeds $75,000/year — the complexity of estimated taxes, potential QBI deductions, and retirement account contributions (SEP-IRA, Solo 401(k)) justify the fee
- You have both W-2 and 1099 income and are uncertain how to allocate deductions
- You own a home and have mortgage interest, rental income, or real estate losses in the same year
- You received an IRS notice about prior year underpayment
- You are newly self-employed and want the calculations reviewed before filing your first return
The cost of a tax professional ($300–600 for a straightforward return with Schedule C and SE) is itself deductible as a business expense. For higher-income nurses, the savings from proper deduction identification often exceed the fee in the first year.
IRS Publication 505 (Tax Withholding and Estimated Tax) and Publication 334 (Tax Guide for Small Business) are the primary official references for self-employed tax obligations. Both are available free at IRS.gov.
For broader financial planning as a per diem nurse, the nursing financial planning guide covers retirement accounts and long-term strategy. For context on whether per diem work is worth the added complexity, see is PRN nursing worth it? and the per diem nursing jobs overview.