If you own a dental practice in Virginia, you have probably had at least one conversation with your CPA about quarterly estimated taxes. You may have been told to send a check to the IRS four times a year and not really understood why, or how the number was calculated, or what happens if you skip a payment.
Understanding quarterly estimated taxes is one of the financial fundamentals that separates a dental practice owner who is in control of their business from one who is constantly being surprised by tax bills. Here is what you need to know.
Why Quarterly Taxes Exist
When you were an associate or an employee, your taxes were withheld from every paycheck. Your employer handled the math, sent the money to the IRS, and you reconciled at the end of the year.
When you became a practice owner, that withholding stopped. The IRS still expects to be paid, but now the responsibility is on you.
The federal government’s solution to this is quarterly estimated tax payments. Four times a year, you pay an estimate of what you will owe for the year. The deadlines are April 15, June 15, September 15, and January 15 of the following year.
Most states with income tax, including Virginia, follow the same quarterly schedule.
How the Estimate Is Calculated
There are two main methods for calculating your quarterly payment.
The safe harbor method. Pay in 100 percent of last year’s tax liability, or 110 percent if your prior year adjusted gross income was over $150,000. Spread across four equal quarterly payments. If you do this, you will not owe a penalty regardless of what your actual income turns out to be.
The actual income method. Project your current-year income and pay 90 percent of the projected tax. This is more accurate but harder to calculate, especially for practices with seasonal patterns or growth.
Most dental practice owners use the safe harbor method because it is simpler and avoids the risk of underpayment penalties. Practices with significant income changes from year to year may benefit from the actual income method, but it requires real bookkeeping discipline.
What Happens If You Skip a Payment
The IRS charges underpayment penalties when you do not pay enough in quarterly estimated taxes. The penalty is calculated quarter by quarter, so skipping the first quarter and trying to catch up later does not fully fix the problem.
The penalty rate floats with interest rates. In 2026, it is in the 8 to 9 percent range, annualized. Not catastrophic, but enough to be worth avoiding.
Virginia charges its own underpayment penalty for state taxes on a similar schedule. Stack the federal and state penalties together and a missed quarter on a six-figure tax bill costs real money.
How Practice Owners Get This Wrong
Three common mistakes we see in our work with Virginia dental practices:
Treating quarterly payments as optional. They are not. The IRS expects to be paid in installments, and underpayment penalties accumulate even on smaller balances.
Not adjusting after major changes. If you bought new equipment, hired an associate, or expanded the practice, your tax picture changed. The safe harbor amount may no longer be enough. Have your CPA recalculate after any significant change.
Letting practice cash flow dictate the payment. Some practice owners pay quarterly taxes only if cash flow is good and skip the payment if it is tight. This is backwards. The tax bill exists either way. Skipping a payment makes the problem worse, not better.
The Cash Flow Strategy
The best way to handle quarterly taxes is to treat them like any other recurring obligation. Calculate your annual tax liability. Divide by four. Set aside a portion of every patient payment into a dedicated tax savings account, so that when the quarterly deadline arrives, the money is already there.
Practices that handle taxes this way never feel the bite of quarterly payments. Practices that try to come up with the money on the 14th of the month every quarter feel a lot of stress that does not need to exist.
Working With a Dental CPA
The right dental-focused CPA does more than file your taxes. They project your income through the year, recommend quarterly payment amounts, flag changes that affect your tax picture, and help you structure the practice to legitimately reduce your tax liability.
At Quantum Accounting, this kind of proactive tax work is the core of what we do for Virginia dental practices. If you are a practice owner who has felt confused or stressed about quarterly taxes, let us help. The first conversation is free, and the math is usually clearer than you expect.
