7 Mistakes New Dental Practices Make in Their First Year

2026-08-21

Avoid costly tax errors in your first year. Learn the 7 most common mistakes new dental practices make and how to prevent them.

Starting a dental practice is exciting, but the first year can be a financial minefield, especially when it comes to taxes. Many new practice owners focus on clinical care and patient experience, only to stumble on tax obligations that can cost thousands. Here are the 7 most common tax mistakes new dental practices make, and how to avoid them.

Mistake 1: Choosing the Wrong Business Structure

Many new dentists start as sole proprietors or general partnerships because it’s easy and free. But this exposes you to unlimited personal liability and can lead to higher self-employment taxes. An S-corporation or LLC can offer liability protection and potential tax savings, especially once your income grows.

What to do this week: Consult a CPA who works with dental practices. Discuss the pros and cons of an S-corp vs. LLC for your situation. The cost of forming an LLC or S-corp ranges from $50 to $500 in state filing fees, plus ongoing annual fees of $0 to $800 depending on your state. The tax savings can be significant: as an S-corp owner, you can pay yourself a reasonable salary and take the rest as distributions, which are not subject to self-employment tax. This can save you 15.3% on a portion of your income.

Mistake 2: Not Tracking Expenses from Day One

In the chaos of opening, many owners mix personal and business expenses, or forget to track small purchases. This leads to missed deductions and a mess at tax time.

What to do this week: Open a separate business bank account and credit card immediately. Use accounting software like QuickBooks or Xero (cost: $30-$80/month) to categorize every transaction. Set aside 30 minutes each week to reconcile. Track every expense, no matter how small: supplies, equipment, marketing, software, rent, utilities, and even mileage. The IRS allows you to deduct business mileage at $0.67 per mile in 2026, so log those trips to the supply store.

Mistake 3: Misclassifying Employees as Independent Contractors

New practices often hire hygienists or front desk staff as 1099 contractors to save on payroll taxes. But the IRS has strict rules. If you control when, where, and how they work, they are employees. Misclassification can lead to back taxes, penalties, and interest.

What to do this week: Review your current staffing arrangements. If you set their schedules, provide tools, and supervise their work, they are employees. You must withhold payroll taxes, pay the employer share of Social Security and Medicare (7.65% each), and file payroll tax returns. Use a payroll service like Gusto or ADP (cost: $40-$100/month) to handle this correctly.

Mistake 4: Ignoring Quarterly Estimated Taxes

As a practice owner, you are responsible for paying taxes throughout the year, not just on April 15. If you don’t make quarterly estimated payments, you’ll face penalties and interest.

What to do this week: Estimate your annual income and calculate your quarterly payments. The IRS requires payments on April 15, June 15, September 15, and January 15. If you’re unsure, work with your CPA to set up a system. The penalty for underpayment is around 5% of the amount you owe, plus interest, so it pays to stay current.

Mistake 5: Overlooking Depreciation on Equipment

Dental chairs, x-ray machines, and other equipment are major investments. Many new owners deduct the full cost in year one, but that may not be the best strategy. Section 179 allows you to deduct up to $1,160,000 (2026 limit) of equipment purchases, but it can push you into a lower tax bracket in future years.

What to do this week: Talk to your CPA about whether to take Section 179 or use bonus depreciation (80% in 2026). Consider your expected income for the next few years. Sometimes it’s better to spread the deduction over the asset’s useful life (5-7 years for most dental equipment) to smooth your tax liability.

Mistake 6: Failing to Claim All Deductions

New practice owners often miss deductions they’re entitled to, leaving money on the table. Common missed deductions include:

Home office deduction (if you have a qualifying space)
Continuing education courses and travel
Professional liability insurance premiums
Marketing and website costs
Office supplies and patient education materials
Business meals (50% deductible)

What to do this week: Review the IRS Publication 535 and create a list of all potential deductions. Keep receipts and logs. A good CPA can help you identify every deduction you qualify for. The average dental practice saves $5,000-$15,000 in taxes by maximizing deductions.

Mistake 7: Not Planning for State and Local Taxes

Many new owners focus on federal taxes and forget about state income tax, sales tax, and property tax. States have different rules for dental practices, and some cities have gross receipts taxes.

What to do this week: Research your state’s tax requirements. You may need to register for a sales tax permit if you sell retail items like toothbrushes or whitening kits. You’ll also need to file state income tax returns. Some states have a franchise tax or annual report fee. Your CPA can help you stay compliant.

FAQ

Q: How much should I set aside for taxes as a new dental practice?

A: A good rule of thumb is 25-30% of your net income for federal and state taxes, plus self-employment tax. If you’re an S-corp, set aside for payroll taxes and your personal income tax on distributions.

Q: Can I deduct the cost of my dental license and certifications?

A: Yes, the cost of obtaining and renewing your dental license, as well as required certifications, are deductible business expenses.

Q: What if I miss a quarterly estimated tax payment?

A: You’ll likely face a penalty, but you can minimize it by making the payment as soon as possible. The penalty is calculated based on how much you owe and how late you are. If you’re in a bind, you can request a payment plan with the IRS.

Q: Should I hire a CPA or use tax software?

A: For a new dental practice, a CPA is worth the investment. They can help you with structure, deductions, and planning. Tax software (cost: $100-$300) is fine for simple returns, but a CPA (cost: $500-$2,000/year) can save you more in the long run.

The bottom line

Your first year in practice is a learning curve, but tax mistakes can be costly. By avoiding these 7 common errors, you’ll save money and avoid headaches. Take action this week: consult a CPA, set up proper bookkeeping, and plan your quarterly payments. A little effort now can save you thousands later.