A sole practitioner is a licensed professional — typically an attorney, physician, dentist, therapist, or CPA — who runs their own practice independently, without partners or a corporate employer. Because no separate legal entity exists between the person and the practice, every dollar of income lands on the practitioner’s personal tax return and every business debt is a personal debt. That single fact drives almost everything else about how sole practitioners are taxed, how they’re exposed to liability, and how they plan for the long term.
The Legal Nature of a Sole Practice
When you open a solo practice, no new legal entity comes into existence. Unlike a corporation, which the government recognizes as a separate legal “person” with its own rights and liabilities, a sole practice is just you doing business under your own name and Social Security number.1U.S. Small Business Administration. Choose a Business Structure There are no formation documents to file with the state, no articles of incorporation, no operating agreement.
You make every decision about the practice — what clients to take, what to charge, when to work — without answering to partners or a board. You own everything the practice earns and every asset it holds. The flip side is that every obligation the practice takes on is yours personally. A lease, an equipment loan, or a malpractice judgment doesn’t attach to some separate business entity. It attaches to you.1U.S. Small Business Administration. Choose a Business Structure
Who Practices This Way
The term shows up most often in licensed professions. Attorneys in private practice, dentists running their own clinics, psychotherapists, and CPAs are the classic examples. What ties these fields together is a licensing requirement: specific academic credentials, passage of a professional exam, and ongoing continuing education to maintain the license.
Each profession’s licensing board sets its own renewal fees and continuing education hours, and requirements vary considerably from state to state. The work itself depends on the individual practitioner’s expertise and ethical obligations to clients or patients.
How Sole Practitioners Are Taxed
Everything Runs Through Schedule C
All business revenue minus deductible expenses goes on Schedule C of your personal Form 1040.2Internal Revenue Service. About Schedule C (Form 1040), Profit or Loss from Business (Sole Proprietorship) The practice itself doesn’t file a corporate return or pay corporate income tax. Your net profit from Schedule C gets added to any other income you have — a spouse’s wages, investment income, rental income — and the total is taxed at your personal rate.3Internal Revenue Service. 2025 Instructions for Schedule C (Form 1040)
This is true even if you form a single-member LLC for liability protection. The IRS treats a one-owner LLC as a “disregarded entity,” so your tax filing is identical to a sole proprietorship: Schedule C, same forms, same process.4Internal Revenue Service. Single Member Limited Liability Companies
Self-Employment Tax
As a sole practitioner, you play both employer and employee, so you’re responsible for the full Social Security and Medicare contribution. The combined self-employment tax rate is 15.3%: 12.4% for Social Security and 2.9% for Medicare.5Internal Revenue Service. Self-Employment Tax (Social Security and Medicare Taxes) Several rules soften the effective bite.
Self-employment tax applies to 92.35% of your net earnings, not the full amount, mirroring the fact that employers don’t pay FICA on the portion they contribute.6Internal Revenue Service. Topic No. 554, Self-Employment Tax The 12.4% Social Security portion only applies to net earnings up to $184,500 in 2026; anything above that is subject only to the 2.9% Medicare tax.7Social Security Administration. Contribution and Benefit Base If your self-employment income exceeds $200,000 ($250,000 for married filing jointly), an extra 0.9% Additional Medicare Tax applies on the excess.8Internal Revenue Service. Topic No. 560, Additional Medicare Tax Finally, you can deduct the employer-equivalent portion — half your self-employment tax — when calculating adjusted gross income.
You calculate all of this on Schedule SE and attach it to your Form 1040.
Deductions Worth Knowing About
Beyond the half-SE-tax deduction, a few deductions meaningfully change what a sole practitioner owes.
If you have a net profit on Schedule C and aren’t eligible for an employer-sponsored plan through a spouse, you can deduct 100% of the health insurance premiums you pay for yourself, your spouse, dependents, and children under age 27.9Internal Revenue Service. Instructions for Form 7206 This is an above-the-line deduction, so you get the benefit even if you don’t itemize. You lose it for any month you were eligible to participate in a subsidized employer plan, whether or not you actually enrolled.
Under Section 199A, eligible sole proprietors can deduct up to 20% of qualified business income.10Office of the Law Revision Counsel. 26 U.S. Code 199A – Qualified Business Income There’s a significant catch for the professionals who typically run sole practices. Lawyers, doctors, accountants, and consultants are classified as “specified service trades,” and the deduction phases out once taxable income exceeds certain thresholds. Above those limits it disappears entirely. High earners in these fields often can’t use it; practitioners with moderate income can.
Ordinary business expenses reduce your Schedule C profit directly: office rent, malpractice insurance premiums, professional dues, continuing education costs, office supplies, software. Detailed records throughout the year separate a manageable tax bill from a painful one.
Quarterly Estimated Payments
No employer withholds taxes from your earnings, so you’re required to send estimated payments to the IRS four times a year:11Internal Revenue Service. Pay As You Go, So You Won’t Owe: A Guide to Withholding, Estimated Taxes and Ways to Avoid the Estimated Tax Penalty
- April 15, covering January through March
- June 15, covering April and May
- September 15, covering June through August
- January 15 of the following year, covering September through December
Miss the deadlines or underpay significantly and the IRS charges an estimated tax penalty. Most practitioners either calculate each quarter’s payment from actual earnings or pay 100% of the prior year’s total tax liability in four equal installments, a safe harbor that avoids penalties even if income rises.
Personal Liability and How to Contain It
Why Your Personal Assets Are Exposed
The biggest financial risk of sole practice is unlimited personal liability. Because no separate legal entity stands between you and the business, a court judgment against your practice can reach personal bank accounts, home equity, investment accounts, and other property.1U.S. Small Business Administration. Choose a Business Structure That applies to malpractice claims, breach of contract with vendors, unpaid lease obligations, and general business debts. The exposure doesn’t end when you close the practice; creditors can still pursue you personally for obligations that arose while it was operating.
What an LLC or PLLC Does and Doesn’t Do
Many sole practitioners form a single-member LLC or, where state law requires it for licensed professionals, a professional LLC (PLLC). This creates a legal barrier between business liabilities and personal assets for ordinary business debts. If a vendor sues over an unpaid invoice or someone is injured in your office, the entity’s assets are exposed first, and your personal assets get some protection.
Here’s the catch that surprises people. A PLLC does not shield you from your own malpractice. If you commit professional negligence, you’re personally liable regardless of your business structure. The liability protection matters only for business debts unrelated to your professional services, such as a lease default, equipment financing, or an employee’s actions. For the risk that keeps most sole practitioners awake at night, insurance is what actually protects you.
Forming an LLC changes nothing about your taxes. The IRS treats a single-member LLC as a disregarded entity, so you still file Schedule C exactly as you would without it.4Internal Revenue Service. Single Member Limited Liability Companies
Insurance That Fills the Gap
Three policies cover most of what a sole practitioner needs. Professional liability insurance, sometimes called errors and omissions coverage, pays defense costs and settlements when a client or patient alleges you made a professional mistake; many licensing boards require it, and some clients won’t hire you without it. General liability insurance covers bodily injury and property damage claims arising from your operations, such as someone getting hurt in your waiting room. A business owner’s policy bundles general liability with property coverage for office equipment, furniture, and supplies.
Many states also offer homestead exemptions that can shield some or all of your primary residence’s equity from business creditors. Protection levels vary dramatically by state, which is worth understanding if you’re practicing as a sole proprietor without LLC protection.
Retirement Savings Without an Employer Plan
Not having an employer match doesn’t mean giving up tax-advantaged retirement savings. Sole practitioners have access to plans with higher contribution limits than most employees get.
A SEP-IRA lets you contribute up to 25% of your net self-employment income, with a maximum of $72,000 in 2026. Setup and administration are minimal, which makes it the most common starting point for solo professionals.12Internal Revenue Service. 2026 Amounts Relating to Retirement Plans and IRAs
A Solo 401(k) lets you contribute in two roles: as the employee (up to $24,500 in 2026) and as the employer (up to 25% of net self-employment income), with a combined cap of $72,000. If you’re 50 or older, you can add a catch-up contribution of $8,000. Those aged 60 through 63 qualify for a higher catch-up of $11,250 under SECURE 2.0.13Internal Revenue Service. 401(k) Limit Increases to $24,500 for 2026, IRA Limit Increases to $7,500
You can also fund a traditional or Roth IRA on top of a SEP or Solo 401(k), up to $7,500 in 2026.13Internal Revenue Service. 401(k) Limit Increases to $24,500 for 2026, IRA Limit Increases to $7,500 The Solo 401(k) generally lets you reach higher total contributions at lower income levels because of the employee deferral piece; at very high incomes the totals converge and the SEP’s simpler administration often wins out.
What Happens When You Stop Practicing
Unlike a corporation, which can outlive its founder, a sole practice is inseparable from the practitioner. When you retire, the practice ends. If you die, the business legally ceases to exist, and all assets and liabilities become part of your personal estate and go through probate.
Heirs can inherit physical assets like equipment, office furnishings, and accounts receivable, but they don’t inherit the practice as a going concern. Continuing the same services would require a new business entity, their own professional licenses, and building client relationships from whatever they’ve inherited. The practice’s value erodes quickly without the person whose reputation built it.
Selling a practice while you’re alive is possible, but your profession’s ethical rules govern the process. Client files and patient records can’t simply be handed over; most licensing boards require informed consent from each client or patient before records transfer to a new provider. Active cases or ongoing treatment plans need explicit arrangements for continuity of care. Practitioners who wait until they’re ready to walk away often find there is less to sell than they expected.
Keeping the Practice in Good Standing
Opening a sole practice involves a few administrative steps beyond your professional license. If you use any name other than your legal name, you’ll need to file a “doing business as” certificate with your local or state government. Depending on your location, you may need a local business permit, occupancy certificate, or business tax certificate to operate from a physical office. And your licensing board will require continuing education credits and annual renewal fees.
Keeping these current matters more than most new practitioners realize. An expired license doesn’t just expose you to fines from the licensing board. It can void your malpractice insurance coverage, since most policies require an active license as a condition of coverage. That leaves you both unable to practice and uninsured for any claims arising during the lapse.