Welcome to ShiftMath—the financial math behind every extra shift, moonlighting gig, and “this better be worth it” offer.

See what you’ll actually take home in under two minutes. No login, no lead forms, and no mysterious spreadsheet formulas. Just clear numbers, transparent assumptions, and tools built for physicians.

Is that extra shift worth it?

True after-tax, after-expense pay for moonlighting and extra shifts. Handles W-2 vs 1099, self-employment tax, and travel costs. Compare two gigs side by side.

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Which offer is actually better?

Compare two contracts by total economic value — sign-on, retirement match, PTO, tail coverage, cost of living — not just headline salary.

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What will that RVU contract pay?

Model base-plus-production, pure production, or greater-of contracts across three volume scenarios. Automatically flags unfavorable thresholds.

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Guides

How much do you actually keep from a moonlighting shift? — marginal taxes, SE tax, and the costs nobody puts in the offer.

Comparing physician job offers: why the higher salary often loses — sign-on bonuses, tail coverage, PTO, and cost of living.

RVU compensation explained — conversion factors, thresholds, and the dead zone that prices your work at $0.

How these tools work

Transparent by default. Every calculator shows its formula, assumptions, and limitations next to the result — so you can judge whether to trust it.

Private by design. Calculations run entirely in your browser. Shareable links encode inputs in the URL; nothing is stored on our servers.

No pressure. Useful answers never require an account, an email, or a call with an advisor.

Not advice. These are educational estimates. For consequential decisions, confirm with a qualified contract attorney, CPA, or fiduciary advisor.