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ShowMath calculators

Every calculator, one place.

243 calculators in 10 categories, plus 29 super calcs that chain them together. Each tool shows the math, cites the formula, and gives you a number you can send to your accountant or lawyer. Free, no signup.

Featured tax workflow

Self-employed taxes are easier when the calculators act like a path.

Start from the full tax chain, jump into quarterlies or brackets, then keep the same assumptions through safe harbor, QBI, and retirement shelter decisions.

Browse tax category Start tax chain

01Start hereFull tax chainRun the full freelancer tax chain when you want one joined answer.

02EstimateQuarterly estimateTurn 1099 income and deductions into quarterly federal payments.

03ProtectSafe-harbor paymentCompare prior-year and current-year safe-harbor targets.

04Bracket checkBracket breakdownSee which federal brackets the same profile actually crosses.

05OptimizeQBI deductionModel pass-through QBI and high-income wage-limit pressure.

06ShelterRetirement shelterCompare SEP and Solo 401(k) contribution room before filing.

Preset chips prefill the full chain and primitive calculators.

Result endcaps carry the selected taxpayer profile forward.

Related tax rails connect deductions, QBI, brackets, and quarterlies.

Tax profile starts

Pick a real taxpayer profile, then choose the calculator depth.

The same shared profiles now open the full ShowMath tax chain, the 1099 quarterly estimator, or the effective-vs-marginal bracket view. No blank-form tax math scavenger hunt. Tiny mercy.

Open tax super calc

W-2 profile

W-2 growth role

Single filer with 401(k)/HSA-style deductions and moderate state tax.

Full tax chainSE tax, federal brackets, state planning, retirement, and quarterlies.Quarterly estimateFederal quarterlies with SE tax, QBI, and deductions.Bracket breakdownSee which federal brackets the profile actually crosses.

Dashboard companions

mitchreise.com

Annual tax summaryOpen dashboard Quarterly tax plannerOpen dashboard Safe harbor checkOpen dashboard

1099 profile

Freelance consultant

1099 income with self-employment tax and a planning-rate state estimate.

Full tax chainSE tax, federal brackets, state planning, retirement, and quarterlies.Quarterly estimateFederal quarterlies with SE tax, QBI, and deductions.Bracket breakdownSee which federal brackets the profile actually crosses.

Dashboard companions

mitchreise.com

Annual tax summaryOpen dashboard Quarterly tax plannerOpen dashboard Safe harbor checkOpen dashboard

W-2 profile

Dual-income family

Married filing jointly with larger pre-tax savings and higher gross income.

Full tax chainSE tax, federal brackets, state planning, retirement, and quarterlies.Quarterly estimateFederal quarterlies with SE tax, QBI, and deductions.Bracket breakdownSee which federal brackets the profile actually crosses.

Dashboard companions

mitchreise.com

Annual tax summaryOpen dashboard Quarterly tax plannerOpen dashboard Safe harbor checkOpen dashboard

W-2 profile

Head of household

HOH filer where the standard deduction changes the effective-rate story.

Full tax chainSE tax, federal brackets, state planning, retirement, and quarterlies.Quarterly estimateFederal quarterlies with SE tax, QBI, and deductions.Bracket breakdownSee which federal brackets the profile actually crosses.

Dashboard companions

mitchreise.com

Annual tax summaryOpen dashboard Quarterly tax plannerOpen dashboard Safe harbor checkOpen dashboard

Featured housing workflow

Real-estate math works better when the mortgage assumptions stay connected.

Use the three super calculators as a path: affordability, refinance breakeven, and rental/investment returns — each with formulas exposed.

Browse real-estate tools Start housing chain

Affordability starts

Start: First-time buyer Start: Stretch test Start: Cash-heavy mover

Refi starts

Start: Rate drop, long stay Start: Short-stay warning Start: Points + itemizing

Investor starts

Start: Cash-flow duplex Start: Thin-margin rental Start: Appreciation bet

Want the dashboard version?

Keep ShowMath for visible formulas, then jump to mitchreise.com for richer housing dashboards using matching starter assumptions.

Companion tools

Home affordabilityTurn the ShowMath housing result into a buyer-ready budget dashboard.Open dashboard Mortgage paymentStress-test payment, amortization, and rent-vs-buy from the hub.Open dashboard Refi breakevenCompare the refinance offer with payoff timing, fees, points, and savings.Open dashboard Rental ROIMove the investment scenario into cash flow, cap rate, and equity tracking.Open dashboard

Step 01 · Can I buy?Home affordability masterPreset: First-time buyerDTI, max responsible payment, mortgage amortization, rent-vs-buy crossover, and 30-year cost.Step 02 · Should I refinance?Mortgage refi enginePreset: Rate drop, long stayCurrent loan vs refi offer, financed fees, points, tax-shield delta, and breakeven month.Step 03 · Is this deal good?Real estate investment chainPreset: Cash-flow duplexCap rate, cash-on-cash return, mortgage payment, after-tax cash flow, and 5-year projection.