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Moonlighting and supplemental income

2 min read

Moonlighting can accelerate your plan—but the quoted rate is not take-home pay. Check classification, taxes, permission, and malpractice first.

THE IDEA

First identify whether the work is W-2 or independent-contractor income. A 1099 payment usually arrives without withholding; net self-employment income can carry 15.3% self-employment tax—12.4% Social Security up to the wage base plus 2.9% Medicare with no wage-base cap—before federal and state income tax.

For 2026, the Social Security wage base is $184,500. W-2 wages and net self-employment earnings share that base. Individuals generally need estimated payments when they expect to owe at least $1,000 after withholding and credits; the ordinary payment dates are April 15, June 15, September 15, and January 15 of the following year, adjusted for weekends and holidays.

Clinical permission matters tooBefore accepting work, check your fellowship or employment agreement, credentialing, malpractice and tail coverage, scheduling rules, and outside-work restrictions. Keep records of ordinary and necessary business expenses, and never deduct costs your employer reimbursed.

Your next steps

  1. Classify the engagement and read the outside-work clause.
  2. Estimate tax before accepting the quoted rate.
  3. Confirm malpractice, tail, licensing, and credentialing responsibilities in writing.

Check your understanding

Select each question to reveal the answer.

✓ 15.3%.
✓ No. They share one wage base.
✓ When they expect to owe at least $1,000 after withholding and credits, subject to the full safe-harbor rules.
✓ Employer permission, credentialing, licensing, malpractice and tail coverage, and scheduling terms.

Planning questions

  1. For each side-income offer, what is the expected after-tax hourly rate after unpaid time and business costs?
  2. What percentage or dollar amount will you reserve from each 1099 payment until your tax calculation is complete?

Sources