Taxes for 1099 associate dentists

This page is general education, not tax advice. Your state, your spouse’s income and your other deductions all change the numbers, so have a preparer run yours.

A W-2 associate’s employer withholds tax and pays half of Social Security and Medicare. As a 1099 associate, nobody does either. You’re running a small business, and the IRS treats you that way.

Self-employment tax: the part W-2 associates never see

Self-employment (SE) tax is 15.3%: 12.4% for Social Security and 2.9% for Medicare, per IRS Topic 554. It applies to 92.35% of your net earnings from self-employment, not to your gross pay.

Two limits matter at dentist incomes:

• The Social Security part stops at the wage base. For 2026, that’s $184,500 of combined wages and self-employment earnings, per the 2026 Form 1040-ES. Medicare applies to all of it.
• Additional Medicare Tax applies to self-employment income above $200,000 for single filers and $250,000 married filing jointly, per Topic 554.

You deduct half of your SE tax when figuring AGI. That softens the hit a little.

Quarterly estimated taxes for 2026

With no withholding, you pay as you go on Form 1040-ES. The 2026 due dates:

Payment	Due
1st	April 15, 2026
2nd	June 15, 2026
3rd	Sept. 15, 2026
4th	Jan. 15, 2027

You can skip the January payment if you file your 2026 return by Feb. 1, 2027, and pay the balance in full.

Who has to pay. Generally, you owe estimated tax if you expect to owe at least $1,000 after withholding. You avoid the underpayment penalty by paying the smaller of 90% of this year’s tax or 100% of last year’s.

The high-income rule. If your 2025 AGI was over $150,000, the “last year” test becomes 110% of last year’s tax. Many associates switching from W-2 to 1099 can use this: pay 110% of last year’s tax in four parts, then settle up in April.

If you also have a W-2 job or a working spouse, you can raise W-2 withholding with a new Form W-4. That can replace or shrink quarterly payments.

Deductible business expenses

To be deductible, an expense must be ordinary and necessary, per IRS Publication 334. Ordinary means common in your field. Necessary means helpful and appropriate, not indispensable.

For a 1099 associate, the usual list:

• Malpractice insurance. Pub. 334 lists coverage for your personal liability for professional negligence.
• Continuing education. Education expenses are on Pub. 334’s list of other deductible expenses.
• Licenses and regulatory fees, such as your state dental license and DEA registration.
• Loupes, instruments and other equipment. Equipment is normally depreciated. If you elect the de minimis safe harbor, you can deduct items up to $2,500 per item or invoice (without an audited financial statement).
• Professional dues. Pub. 334 bars dues to business, social, athletic and similar clubs. Professional association dues aren’t on that list, but ask your preparer how yours are treated.
• Tax preparation for the business part of your return.

Keep receipts and a separate account for business spending. Mixed personal and business costs have to be split, and only the business part counts.

If you pay your own health insurance, Pub. 334 describes a self-employed health insurance deduction for you and your family.

The QBI deduction, and why dentists get phased out

The qualified business income (QBI) deduction lets sole proprietors deduct up to 20% of QBI. It’s capped at 20% of taxable income (figured before the deduction, minus net capital gain).

Dentistry is a specified service trade or business (SSTB). The Form 8995-A instructions list health, “including physicians, pharmacists, nurses, dentists.”

For an SSTB, income decides everything. For 2026, per Rev. Proc. 2025-32:

Filing status	Full deduction if taxable income is at or below	Phased out completely above
Single and most others	$201,750	$276,750
Married filing jointly	$403,500	$553,500

Between those numbers, only part of your 1099 income counts. Above the top, a dental SSTB gets no QBI deduction.

Your QBI isn’t your full net profit. You reduce it by the deductible half of SE tax, the self-employed health insurance deduction and retirement plan contributions.

Worked example: a first-year 1099 associate

Assumptions: single, no dependents, 2026 rules, federal tax only. Collections-based 1099 pay of $200,000. Business expenses of $15,000 (malpractice, CE, license, dues, loupes). Standard deduction of $16,100. No retirement plan yet, no other income.

Step	Math	Amount
Net profit	$200,000 − $15,000	$185,000
SE tax base	$185,000 × 92.35%	$170,848
SE tax	15.3% of the base (under the $184,500 cap)	about $26,140
AGI	$185,000 − half of SE tax ($13,070)	about $171,930
Taxable income before QBI	$171,930 − $16,100	$155,830
QBI deduction	Lesser of 20% of QBI ($34,386) or 20% of taxable income	about $31,170
Taxable income	$155,830 − $31,170	about $124,660
Income tax	2026 single brackets	about $22,520
Total federal	SE tax + income tax	about $48,660

That’s about $12,160 a quarter, or about 24% of gross pay, before state tax. Taxable income is below $201,750, so the dental SSTB rule doesn’t reduce the QBI deduction here.

Push net profit past about $230,000 and the picture changes. Taxable income past $201,750 starts shrinking the QBI deduction, and Additional Medicare Tax starts once SE earnings (92.35% of net profit) pass $200,000.

How 1099 income changes your RAP payment

RAP bases your payment on AGI: up to 10% of AGI, divided by 12, minus $50 per dependent, with a $10 minimum (Edfinancial). Joint filers use combined income.

In the example, AGI of about $171,930 puts the RAP payment near $1,433 a month. Three levers move it:

• Business expenses lower AGI almost dollar for dollar. Another $10,000 of real expenses cuts AGI about $9,290 (half-SE-tax deduction shrinks too), or about $77 a month of RAP.
• Retirement contributions lower AGI directly. A $24,500 pre-tax solo 401(k) deferral cuts RAP about $204 a month. See the solo 401(k) guide for 1099 associates.
• The QBI deduction doesn’t help RAP. It goes on Form 1040 line 13a, after AGI, so it lowers taxable income but not AGI.

Don’t spend a dollar just to lower RAP. A $1,000 expense saves at most about $100 a year of RAP payments, plus the tax savings. Buy what the job needs.

Estimate your payment with the RAP payment estimator. The RAP guide covers the rest.

When a W-2 job beats 1099 on taxes

A 1099 offer has to pay more to break even. On the example’s $185,000 of net profit, SE tax runs about $26,140. A W-2 employee’s share on the same pay would be 7.65%, about $14,150.

Compare offers on after-tax, after-benefits pay. The associate offer math tool and how associate pay works lay out the comparison.

What to do next

1. Open a separate account for 1099 deposits and business expenses. Move a set share of every check into a tax account the day it arrives.
2. Pick your safe harbor. Use 110% of last year’s tax if your 2025 AGI topped $150,000, or estimate 90% of this year’s.
3. Put the four due dates on your calendar: April 15, June 15, Sept. 15, 2026, and Jan. 15, 2027.
4. Track deductible expenses all year. A spreadsheet works, or an expense app such as Keeper.
5. Get help for the first year. A 1099 year with a W-2 changeover, a spouse and RAP is worth a preparer. 1-800Accountant is one option; a local CPA who works with dentists is another.
6. Budget the rest with your first associate paycheck budget, and keep a bigger cushion in high-yield savings.