The tax and accounting side of running a dental practice (and what most practice guides skip)

Most guides on opening a dental practice spend a lot of time on the things you can see: the right location, the right equipment, whether to lease or buy, how to build a patient base. All of that matters. But there is a whole other side of running a practice that tends to get mentioned in a single paragraph under "financial planning" and then dropped. The tax and bookkeeping obligations that start the day you open and compound quietly until they become a problem are what this article is about.

If you are a dentist who recently opened a private practice, or you are getting close to doing it, the questions below are ones you will need answers to eventually. Better to have them early.

How your entity structure affects how much tax you actually pay

The decision most new practice owners make without fully understanding its consequences is how to structure the business. Sole proprietor, single-member LLC, S-Corp: these are not just legal labels. They determine how your income gets taxed and, in particular, how much self-employment tax you pay.

Self-employment tax runs at 15.3%, but the IRS applies that rate to 92.35% of your net earnings, not the full amount. It consists of 12.4% for Social Security, which applies up to the $184,500 wage base in 2026, and 2.9% for Medicare, which has no ceiling. If your net practice income after expenses is $280,000, the actual self-employment tax calculation works out to roughly $39,000 to $40,000, depending on your specific situation, before federal income tax enters the picture. Higher earners also face an additional 0.9% Medicare surcharge on income above $200,000.

An S-Corp changes this. Under an S-Corp structure, you pay yourself a reasonable salary and take the remaining profit as a distribution. You pay self-employment tax only on the salary portion, not the distribution. Whether this saves money depends on what salary would be considered reasonable for the services you actually perform, including your clinical duties, administrative time, management responsibilities, and what comparable practices pay for similar work. The IRS does not publish a universal threshold at which an S-Corp election starts making sense. The savings need to exceed the added costs of running payroll, filing a separate corporate return, and maintaining the structure compliantly. Whether those numbers work in your favour is a calculation best done with an accountant before you file your first return, not something to revisit after three years of overpaying.

Why dental practice bookkeeping is more complicated than most small businesses

A retail shop collects cash or card at the point of sale and deposits it. The bookkeeping is not simple, but the revenue picture is mostly clear by the end of the day.

A dental practice does not work like this. Insurance reimbursements can take 30 to 90 days to arrive after a procedure. The amount received often differs from the amount billed because of contractual adjustments with insurance networks. Patient co-pays are collected at the chair but need to be reconciled against what insurance eventually pays. If the practice is also running on a fee-for-service model and billing some patients directly, accounts receivable can get complicated fast.

The first thing to get right is your accounting method. Cash-method practices recognise income when payment is received and expenses when paid. Accrual-method practices recognise income when earned and expenses when incurred. The IRS requires that the method you use clearly reflect income and that you apply it consistently. Your practice-management software may show accrual-style production reports for operational visibility while your tax books run on the cash method. That is not a problem, but your bookkeeper and tax preparer need to know how the two reconcile.

Regardless of method, the minimum monthly close should map your practice-management system to the general ledger by payment type: patient cash, card receipts, insurance electronic payments, contractual adjustments, refunds, credit balances, and unapplied cash. A single insurer EFT that covers twenty claims should not be posted as an unexplained lump sum. Reconcile the patient and insurance ledgers to the general ledger, then reconcile the bank and merchant deposits. That is where the numbers earn the trust you need to file confidently.

The broader point is that dental bookkeeping is a reconciliation design problem, not simply a larger spreadsheet. A practice running on bank statements and a year-end scramble will misstate revenue, miss deductions, and make tax planning nearly impossible.

Equipment deductions: What Section 179 actually means for a dental practice

When you outfit a practice, the numbers are significant. A dental chair typically runs $3,000 to $8,000. A digital X-ray system can cost $30,000 to $70,000. CBCT imaging equipment runs $100,000 or more. Sterilisation units, patient monitors, compressors. A full fit-out of even a modest single-operatory practice can easily reach $150,000 to $250,000.

Under standard depreciation rules, you would deduct that equipment cost gradually over five to seven years. Section 179 of the tax code allows you to deduct the full cost of qualifying equipment in the year it is placed in service, up to $2.56 million for tax years beginning in 2026. The phase-out begins above $4.09 million of total placed-in-service property for the year. Dental equipment qualifies. So does qualifying software.

The timing point matters: Section 179 applies to property placed in service during the tax year, not simply purchased. Equipment ordered in December but not installed and operational until January of the following year is placed in service in January. Plan equipment acquisition around when the property will actually be usable, not around when the invoice is dated.

The deduction is also limited to your net taxable income from the practice for the year, so it cannot manufacture a loss beyond what the business actually generated. Any unused deduction is carried forward to future years, where it can offset practice income when the business is more profitable.

A practice that spends $180,000 outfitting a new space and claims the full Section 179 deduction reduces its taxable income by that amount in year one, rather than spreading small deductions across seven years while paying full tax on early revenue. This is not an obscure loophole. It is a standard provision that a significant number of practice owners underuse simply because no one walked them through it.

The quarterly tax payment problem that hits in year one

When you were an associate working for a group practice or a dental service organisation, your employer withheld income tax and your share of FICA from every paycheck. You never had to think about it.

When you become the practice owner, that mechanism disappears. The IRS still expects to receive tax payments on your income throughout the year. The obligation shifts to you, in the form of quarterly estimated tax payments due on April 15, June 15, September 15, and January 15 of the following year.

The IRS provides safe harbour rules to avoid underpayment penalties. You are generally protected if you pay at least 90% of your current-year tax liability, or 100% of the prior year's liability, whichever is smaller. For taxpayers with income above $150,000, the prior-year safe harbour rises to 110%. In your first year of practice ownership, when there is no prior-year liability to anchor to, the 90% current-year test is the relevant benchmark.

Dental practice income is often uneven, particularly in year one. Revenue builds as the patient base grows and insurance credentialing is completed. If your income is seasonal or accelerates sharply mid-year, dividing your annual tax estimate into four equal payments can leave you either over-withholding early or scrambling at the end. Form 1040-ES includes an annualised income instalment method that lets you calculate each quarter's payment based on actual year-to-date income rather than an annual estimate divided by four.

The practical starting point is to set aside 25% to 30% of net practice income each month and make the quarterly payments on schedule. If you skip them, you will face a larger tax bill in April plus an underpayment penalty, arriving at exactly the moment you are trying to stabilise the practice financially.

Becoming an employer: the compliance side of hiring

The moment you hire your first employee, whether a receptionist, a dental hygienist, or an office manager, you become an employer in the eyes of the IRS and your state revenue agency. This is a meaningful shift and it comes with obligations that do not go away.

Federal payroll taxes require you to withhold income tax and the employee's share of FICA (6.2% Social Security and 1.45% Medicare) from each paycheck, pay your matching employer share on top, and deposit these amounts to the IRS on a schedule determined by your total payroll size. You also pay Federal Unemployment Tax (FUTA) at 6% on the first $7,000 of each employee's wages, though a credit for state unemployment contributions typically reduces the effective rate to 0.6%. At year-end, every employee receives a Form W-2. For 2026 wages, the deadline to furnish employee copies and file with the SSA is February 1, 2027.

Most states add their own payroll registration requirements, unemployment insurance contributions, and in some cases additional withholding obligations. You need to register in each state where employees perform work.

The deposit schedule matters. Penalties for late payroll tax deposits start at 2% for payments 1 to 5 days late and increase from there. Configure your deposit schedule before you run your first payroll, not after the first deposit comes due.

The associate dentist question: employee or independent contractor?

Many practices bring in associate dentists on a 1099 basis, paying them as independent contractors rather than employees. This arrangement is common and reduces payroll obligations significantly. It is also an area where the IRS has taken a specific interest in the dental industry, because the line between contractor and employee is frequently crossed without the practice realising it.

The IRS uses the same three-factor test described above. Behavioural control asks whether the practice directs how the associate works, not just the clinical outcome but the schedule, equipment, and patient assignment. Financial control looks at whether the associate has the ability to profit or lose on the engagement and works for multiple practices. The type of relationship factor considers whether the arrangement is indefinite, whether the associate is integrated into the practice's day-to-day operations, and whether they receive any benefits.

An associate who works exclusively at your practice, follows your scheduling system, uses your equipment, sees your patients, and has worked there for three years without a defined end date would likely be classified as an employee under the IRS three-factor test, regardless of what the contract says. Misclassifying that person exposes the practice to back FICA taxes, penalties, and interest covering both the employer and employee share.

The safer contractor arrangement is one where the associate genuinely has autonomy: they set their own hours, carry their own malpractice insurance, work at multiple practices, and have a defined engagement scope. If that is the actual working relationship, the 1099 classification holds. If the relationship is an employment arrangement with a contractor label on it, the risk is real. If the classification is genuinely unclear, Form SS-8 can be filed with the IRS for a formal determination.

The deductions most dental practices miss

Beyond Section 179 and equipment, a well-run dental practice has a substantial deduction profile that often goes underused when the books are not clean enough to support it.

Malpractice insurance premiums are fully deductible as a business expense, as are property insurance and business liability coverage. Health insurance premiums for the owner are generally deductible under the self-employed health insurance deduction, but the rules have conditions: the deduction is not available for any month in which you were eligible to participate in a subsidised employer plan (through a spouse's employer, for instance), it is limited to your net self-employment income, and more-than-2% S-Corp shareholders have additional treatment requirements. Confirm the specific application with your accountant.

Continuing education courses and licence renewal fees are deductible. Professional association memberships, including the American Dental Association and state dental associations, are deductible. Laboratory fees, dental supplies, and infection control materials are operating expenses deductible in the year incurred. So is the interest on any dental practice loan, including the portion of an SBA loan used for equipment or leasehold improvements.

A portion of your home used exclusively and regularly for administrative work can qualify for the home office deduction. The IRS offers a simplified method at $5 per square foot, capped at 300 square feet, for a maximum deduction of $1,500. The regular method allows actual expenses but requires careful record-keeping. Either way, the use must be genuine, regular, and exclusive. A desk in a shared room does not qualify.

None of these deductions are complicated. But claiming them accurately requires that the underlying transactions are recorded correctly in the books throughout the year. A practice reconstructing its finances from bank statements in October will miss some of these, or spend significant time and accountant fees establishing records that should have existed all along.

How Inkle helps with the financial side of your practice

Inkle handles bookkeeping, tax filing, and compliance for US businesses, including owner-operated practices that do not have a finance team handling this internally.

On the bookkeeping side, Inkle Books tracks transactions, categorises expenses, reconciles accounts, and produces the monthly financial statements your practice needs to understand its actual position. The platform connects directly to US bank accounts and generates vendor reports for Form 1099, which matters if you are paying associate dentists or other contractors who are correctly classified as independent contractors.

On the tax side, Inkle Tax handles federal and state filing and tracks filing deadlines and tax obligations through a compliance dashboard, so you know what is due and when, including quarterly estimated payments and annual returns. Licensed CPAs review filings rather than leaving them to software alone.

A note on payroll: Inkle's bookkeeping and tax services track your obligations and keep your books current, but payroll processing itself, including running payroll, calculating withholdings, and managing deposit schedules, typically requires a dedicated payroll service. Inkle can work alongside your payroll provider and ensure the payroll transactions are correctly recorded in your books.

Inkle does not handle dental billing or insurance claim management. That is a specialist function with purpose-built tools. What Inkle does is take the bookkeeping and tax filing off your plate so you are not managing either yourself, or searching for a CPA who understands small business compliance without charging large-firm rates.

For a dental practice owner who spent a decade learning dentistry and not tax law, that tends to be the right division of labour.

Inkle handles bookkeeping and tax for owner-operated businesses across the US. See how it works or book a demo to talk through what your practice needs.