A self-employment tax guide for dentists

Imagine this: A patient walks into your office with a mild toothache, expecting a quick fix—maybe a filling. But after an exam, you give them the bad news: They need a root canal. They’re shocked and maybe even a little angry.

Now, imagine yourself in their place—except the bad news isn’t coming from a doctor. It’s coming from the IRS. Maybe you missed a deadline or underpaid your estimated taxes. Maybe you missed a deadline, underpaid estimated taxes, or didn’t realize self-employment tax was separate from income tax. Whatever the reason, the IRS doesn’t take excuses.

Just ask Dr. Boulos “Paul” Hanna, a Connecticut dentist who misreported income and failed to file returns for years.^[1]The result? A federal tax evasion charge, a 10-month prison sentence, and $1.38 million in restitution.

You’re probably not dodging taxes on purpose—but are you sure you’re paying what you actually owe? Are your estimated payments on track, or will you get hit with a penalty? And do you really understand how self-employment tax works—or are you unknowingly setting yourself up for trouble?

For many dentists running their own practice, the tax rules aren’t always clear. But one thing is: getting it wrong can cost you—big. 

So, what exactly is self-employment tax, and how do you make sure you’re paying the right amount without overpaying? Let’s break it down in this blog. 

Self-employment tax for dentists: what is it?

If you own a dental practice, you’re not just a healthcare provider—you’re also a business owner. And that means your tax obligations look very different from those of an employed dentist.

Self-employment tax (SE tax) is how the IRS collects Social Security and Medicare taxes from business owners. 

Normally, these taxes are automatically deducted from an employee’s paycheck, with their employer covering half of the cost. But as a self-employed dentist, you don’t have that luxury. Instead, you’re responsible for the full amount.

This tax applies to net earnings from your practice, not just your take-home income. It’s in addition to federal and state income taxes, which means that failing to plan for it can leave you with a much bigger tax bill than expected. That’s why it’s important to understand how self-employment tax rates work. 

The self-employment tax rate

Self-employment tax totals 15.3% of your net earnings and is made up of:

• 12.4% for Social Security (on earnings up to a certain limit)

• 2.9% for Medicare (applies to all earnings, no cap)

For 2024, the Social Security tax only applies to the first $168,600 of your net income. Any earnings above this limit aren’t subject to the 12.4% Social Security portion, but you’ll still owe Medicare tax.

Additionally, if your income exceeds a certain threshold, you’ll owe an extra 0.9% Medicare tax on top of the standard 2.9%.

• Single filers: Additional tax applies when earnings exceed $200,000

• Married filing jointly: Applies to income above $250,000

• Married filing separately: Applies after $125,000

Unlike Social Security tax, there’s no upper limit—every dollar above these thresholds is subject to the extra 0.9%. 

Let’s say your dental practice earns $250,000 in net income:

• The first $168,600 is subject to Social Security tax (12.4%)

• The full $250,000 is subject to Medicare tax (2.9%)

• The amount above $200,000 ($50,000) is hit with an extra 0.9% Medicare tax

That’s a significant tax obligation—one many dentists underestimate.

Deductions that reduce your self-employment tax

As a self-employed dentist, you have legitimate business expenses that reduce your taxable income—and the less income you report, the less tax you pay. 

Here are the key deductions you can claim: 

1- SE tax deductions

Since traditional employees split SE tax with their employer, the IRS allows self-employed dentists to deduct 50% of their self-employment tax from their taxable income. This doesn’t lower your actual tax bill but reduces your adjusted gross income (AGI), which can lower your overall tax liability.

2- Health insurance premiums

That’s a significant expense—but as a self-employed dentist, you can deduct 100% of your (and your family’s) health insurance premiums, reducing your taxable income and making healthcare more affordable. This deduction applies even if you don’t itemize your deductions.

3- Business expenses

Running a dental practice comes with significant expenses, but many of them are tax-deductible. Equipment, office rent, dental supplies, and even software subscriptions can reduce your taxable income. Employee wages, lab fees, and marketing costs also count. The key is to track these expenses properly so you can claim every deduction you’re entitled to.

Also read: 18 popular tax deductions for business owners in 2024-2025

How to calculate SE tax?

1. Determine your gross income: This includes all revenue from your practice: patient payments, insurance reimbursements, and any additional services.

2. Subtract business deductions: Expenses like rent, equipment, staff wages, and dental supplies reduce your taxable income.

3. Calculate self-employment tax: The IRS applies this tax on your net income, not gross revenue. This covers your Social Security and Medicare obligations.

4. Deduct half of your self-employment tax: The IRS lets you deduct 50% of your self-employment tax before calculating your income tax.

5. Apply personal deductions: The standard deduction or itemized deductions (like student loan interest) further lower your taxable income.

6. Determine federal & state income taxes: After deductions, you’re taxed at your applicable income tax rate.

7. File the right forms: Self-employed dentists typically file Schedule C (Profit or Loss from Business) and Schedule SE (Self-Employment Tax) along with their 1040.

Also read: Schedule SE (form 1040): Filing the self-employment tax form

How to pay self-employment tax

The reason? Despite 76% of business owners holding a college degree, most were never taught how to handle taxes^[4].

If you can relate, you’re not alone. Tax rules for self-employed dentists can be overwhelming. 

Here’s how to make sure you’re paying your self-employment taxes correctly.

1. Obtain a Social Security Number (SSN) or ITIN

If you don’t already have a Social Security Number, you need one to report self-employment income. Non-citizen dentists may need an Individual Taxpayer Identification Number (ITIN) instead.

2. Calculate your estimated tax payments

Since self-employment tax is based on net earnings, you first need to estimate your income for the year. Then, using Schedule SE, determine how much you’ll owe in self-employment tax (15.3%) and income tax. The IRS provides Form 1040-ES^[5], which includes a worksheet to help calculate your quarterly payments.

3. Make quarterly payments on time

Self-employed dentists must pay estimated taxes four times a year:

• April 15 (for income earned January–March)
• June 15 (for April–May)
• September 15 (for June–August)
• January 15 (next year) (for September–December)

These payments go toward both self-employment tax and federal income tax. Payments can be made through IRS Direct Pay, EFTPS, or by mail.

How to pay estimated taxes:

• Online through the IRS Direct Pay system.
• Using EFTPS (Electronic Federal Tax Payment System).
• Mailing a check with Form 1040-ES.
• Automating payments through bookkeeping software like QuickBooks^[6] or Xero^[7].

Should you handle taxes yourself?

Tax compliance isn’t just about filling out forms; it requires meticulous recordkeeping and meeting strict deadlines. And when you’re managing your taxes solo, you’re also responsible for:

• Tracking income & expenses: Every dollar earned and spent must be categorized correctly for tax purposes.

• Estimating and paying quarterly taxes: You must calculate and submit estimated payments since taxes aren’t withheld from your income.

• Staying compliant with tax laws: Tax regulations change frequently. A missed update could mean lost deductions or unexpected liabilities.

A solid bookkeeping system makes all of this easier. Instead of scrambling at tax time or second-guessing your numbers, you’ll have accurate records ready to go. Without proper bookkeeping, filing your taxes accurately becomes a guessing game—and the IRS doesn’t take kindly to mistakes.

The bottom line

Now that you understand how self-employment tax works, what comes next? Making sure you file correctly and on time before the next deadline. 

Could you handle it all yourself? You might think that you can. 

Managing tax payments, tracking deductions, and ensuring compliance might seem doable—until you’re faced with shifting tax laws, missed deadlines, or an unexpected IRS notice. Without a bookkeeping system in place, tax season turns into a stressful scramble, increasing the risk of errors. That’s why most dentists turn to expert bookkeeping services. 

At CoCountant, we provide expert bookkeeping services to dentists. From tracking expenses and maximizing deductions to ensuring timely estimated tax payments, we take the guesswork out of managing your finances. Our experts keep your books audit-ready, help you avoid costly IRS penalties, and ensure you’re always prepared for tax deadlines.

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