10 Financial Mistakes Dentists Make (And What They Cost)

Dentists are among the highest-earning professionals in the country — and among the worst at keeping what they earn. Not because they spend recklessly, but because dental school doesn't teach personal finance, the financial planning industry rarely specializes deeply enough in dental practice economics, and dentists are too busy running practices to notice the leaks until they're large.

These ten mistakes each cost somewhere between $10,000 and $500,000+ over a dental career. Some are one-time errors that can't be undone. Others are ongoing drags that compound every year you don't fix them.

Mistake #1: Missing the disability insurance guaranteed-issue window

New dental graduates have a limited window — typically available shortly after graduating or joining a qualifying employer — during which they can obtain own-occupation disability insurance through dental association group programs without individual medical underwriting. This guaranteed-issue (GI) window is one of the most valuable financial opportunities a dentist ever gets, and most miss it entirely.

Here's why it matters. Dental school and residency involve years of fine-motor, high-posture, repetitive work. By the time you graduate, there's a meaningful probability that you have early carpal tunnel symptoms, a wrist or shoulder issue from clinical years, or some other condition that an individual underwriter would either exclude from coverage or rate against. During a GI window, none of that matters — coverage is approved at standard rates regardless of health history.

Once the window closes, you're subject to individual underwriting. Exclusion riders for hand, wrist, or repetitive stress conditions — the exact conditions that would end a dental career — can make individual coverage prohibitively expensive or meaningfully incomplete. A dentist who misses the GI window and later develops a disability-causing condition may find their coverage doesn't pay out on the claim they most needed it for.

Mistake #2: Staying sole proprietor too long

A dentist operating as a sole proprietor or single-member LLC pays self-employment tax (15.3% up to $184,500, then 2.9% above that — 2026 Social Security wage base)² on every dollar of net practice profit. On $350,000 of net income, that's approximately $27,000–$30,000 in SE tax per year.

An S-corp election changes this materially. Only your W-2 salary is subject to FICA. Distributions above your salary are SE-tax-free. With a reasonable salary of $165,000 on $350,000 of net income, the annual savings reach $10,000–$17,000 per year — every year you operate this way.

The mistake isn't failing to know about S-corps. It's waiting. Dentists who delay the switch until their income exceeds $300,000 often have already paid 3–5 years of unnecessary SE tax. Over a dental career, that's $50,000–$85,000 that went to the IRS instead of your retirement account. Use the S-corp savings calculator to find your break-even point.

Mistake #3: Under-using dental-specific retirement vehicles

The average dentist contributing to an IRA shelters $7,000 per year. The average dentist with a properly structured solo 401(k) and cash balance plan can shelter $150,000–$290,000 per year. At a 37% marginal tax rate, that difference is worth $53,000–$105,000 in taxes avoided annually.

The contribution ceiling in 2026 for practice owners:³

Most dentists don't know the cash balance plan exists. Many who know it exists assume it's only for very large practices. In reality, it works best for solo dentists netting $300,000+ who are 45 or older and want to catch up on retirement savings aggressively. See our cash balance plan guide for dentists for the age-based contribution table.

Mistake #4: Treating the practice as the entire retirement plan

This is the single most dangerous financial mistake in dentistry, and it's remarkably common. The typical dentist has 70–80% of their total net worth tied up in the practice. The logic seems sound: build a valuable practice, sell it at retirement, live on the proceeds. The problem is that this plan has four failure modes that are largely outside your control:

• Health. A disability, injury, or serious illness can force a practice sale at a time not of your choosing, in a market not of your choosing, at a fraction of the value a planned sale would achieve.
• DSO consolidation. In markets where DSOs have already bought the majority of practices, individual buyer pools thin out. The multiples available to a solo seller in 2030 may not look like 2022 multiples.
• Practice-specific decline. One bad year of production, a key associate leaving, or a new competitor moving in nearby can compress EBITDA significantly in the 2–3 years that most buyers use to value the practice.
• Personal circumstances. Divorce, estate issues, or partner conflict can force a sale at a suboptimal moment.

The fix isn't to sell the practice prematurely — it's to build liquid retirement assets in parallel so that the practice sale is a wealth accelerant, not a survival necessity. A dentist who retires with $1.5M in liquid assets plus a $2M practice sale is in a fundamentally different position than one who retires with $200K in liquid assets who needs to sell for $2M to fund retirement. In the first case, you can wait for the right offer. In the second, you can't. See the financial independence guide for the target stack by career stage.

Mistake #5: Refinancing federal student loans without checking PSLF eligibility first

Refinancing federal dental school loans into a private loan is an irreversible decision. Once federal loans are refinanced, they become private — permanently ineligible for Public Service Loan Forgiveness, income-driven repayment, and any future federal relief programs.

For a dentist who is — or could be — PSLF-eligible (working at a FQHC, VA, IHS facility, or public dental school), this mistake can cost $300,000–$500,000 in tax-free forgiveness. A dentist with $400,000 in debt on an IBR or RAP plan working at a qualifying employer for 10 years pays roughly $140,000–$180,000 total while the remaining balance is forgiven tax-free. Refinancing the same loans at 5.5% fixed results in paying the entire $400,000 plus $120,000+ in interest.

The private practice track often makes refinancing the better math. But the PSLF analysis must come first, because refinancing forecloses that option permanently. Read the full PSLF for dentists guide and the loan refinancing decision guide before touching federal loans.

Mistake #6: Getting blindsided by IRMAA on the practice sale

Medicare calculates Income-Related Monthly Adjustment Amount (IRMAA) surcharges based on your MAGI from two years prior. This lookback creates a trap for dentists who sell their practice for a large lump-sum gain: the sale income triggers top-bracket IRMAA surcharges not in the year of the sale, but in years 2 and 3 afterward — when the sale proceeds are already invested and the income is gone.

The 2026 IRMAA surcharges add $202.90–$487.00 per month per person on top of the standard Part B premium, depending on income tier.⁴ A married couple selling a practice for a $1.5M–$2M gain would face the top surcharge tier for two years — roughly $13,872 per year in additional Medicare costs that most dentists never see coming.

Mitigation strategies include:
— Installment sale. Spreading the gain recognition over 2–3 years can keep you below the upper IRMAA thresholds in any single year.
— Roth conversions pre-sale. Converting pre-tax retirement balances in the 2–3 years before the sale, at lower tax rates, reduces future required minimum distributions that would otherwise compound IRMAA exposure in retirement.
— SSA-44 appeal. If your income drops significantly in the year after the sale (no more practice income), you can file SSA Form 44 to appeal the IRMAA surcharge using current-year income rather than the prior-year lookback.

None of these strategies work if you start thinking about them after the sale. They require 2–3 years of advance planning. See the full IRMAA and Medicare planning guide.

Mistake #7: Misunderstanding DSO rollover equity

DSO transactions often include a "rollover equity" component where you take 20–40% of the deal in equity rather than cash. This is marketed as upside participation when the DSO eventually sells to a larger buyer or goes public. The reality is more complicated, and dentists who don't understand the structure often receive far less than they expected.

Two critical issues that dentists routinely miss:

Liquidation preferences. DSO equity is typically issued as LLC membership units or preferred shares with a liquidation preference in favor of the private equity sponsor. When the eventual exit event happens, the PE firm's capital comes out first — often at 1.5× to 2× their investment — before any remaining equity is split. Your "40% of the company" may be 40% of what's left after the PE firm takes their preference. In unfavorable scenarios (a sale at a lower multiple than expected), there may be nothing left for rollover holders.

QSBS exclusion doesn't apply. Under IRC §1202(e)(3), dental and health services companies are explicitly excluded from the Qualified Small Business Stock exclusion that tech founders use to exclude up to $15M in gains from taxation. Every dollar of DSO equity gain is taxable at capital gains rates (23.8% for most dentists in the top bracket, including the 3.8% NIIT).¹ There's no tax shelter available that a comparable tech equity gain might have.

Read the full DSO rollover equity guide before signing any rollover agreement.

Mistake #8: Under-insuring the practice

Most solo dental practice owners carry malpractice insurance and little else. The gap is often significant:

BOE insurance is particularly overlooked. A solo dentist disabled for 6–12 months faces $20,000–$60,000+ in fixed overhead (rent, staff, loan payments) that continues even if they're not producing. Personal disability insurance covers your personal income. BOE covers the practice — they're separate products addressing different risks. See the business overhead expense insurance guide.

Mistake #9: Buying major equipment in the year before a practice sale

Section 179 expensing ($2.56M limit, 2026) and 100% bonus depreciation — restored permanently under the OBBBA for assets placed in service after January 19, 2025 — make dental equipment purchases very tax-efficient. The mistake is timing them wrong relative to a practice sale.

When buyers value a dental practice, they typically use a 2–3 year average of EBITDA. A $250,000 equipment purchase in year N reduces that year's EBITDA by $250,000 (if fully expensed under Section 179). That lower EBITDA drags down your 3-year average, reducing the practice's sale value by roughly $750,000–$1,250,000 at a 3–5× EBITDA multiple — far more than the $92,500 in tax savings the deduction provided at a 37% rate.

The counterintuitive result: buying a $250,000 scanner 18 months before your practice sale might save you $92,500 in taxes but cost you $900,000 in sale price. Coordinate major equipment decisions with your exit timeline — ideally 3+ years out — or structure the purchase so it's treated as an add-back in the buyer's recast EBITDA.

Mistake #10: Starting exit planning 12 months before the sale

Most dentists who sell their practice start seriously thinking about the process 12–18 months before their target date. Most of the financial value in a practice sale is created 3–5 years before the sale.

What the 3–5 year window allows that 12 months doesn't:

• EBITDA building. A practice at 65% overhead that reduces to 60% over 3 years shows buyers a clear, credible earnings trend — not a suspicious pre-sale cost-cutting spike.
• Associate integration. Buyers pay more for a practice that doesn't depend entirely on the selling dentist's patient relationships. Bringing in and developing an associate 3+ years before the sale reduces this risk.
• Entity structure review. If the practice is still a sole proprietorship or LLC, converting to an S-corp 2+ years before the sale captures multiple years of SE tax savings and may affect how the transaction is structured.
• Roth conversion window. The 2–3 years before a large sale are often the last opportunity to convert pre-tax retirement balances at rates lower than what you'll face after the sale income hits. Once the sale occurs, the tax rate window closes.
• IRMAA pre-planning. Installment sale structures and Roth conversions must be initiated before the sale year to affect the IRMAA lookback.

If you're planning a practice sale in 2029 or 2030, the decisions you make in 2026 will have more impact on your after-tax sale proceeds than the decisions you make in 2028. See the dental practice exit planning guide for the full year-by-year action timeline.