⚠️ NOT FINANCIAL, TAX, OR LEGAL ADVICE. SmartTax is for educational purposes only. All calculators, charts and graphs are illustrative tools — not professional guidance. Always consult a qualified CPA, tax attorney, or financial advisor before making any financial decisions.
2026 Tax Year · Currently Free · No Signup

Tax Planning Tools
for Smart Investors

Model your real tax liability across scenarios — California vs. no state, W2 income vs. none. Built with official 2026 IRS brackets and CA FTB rates.

📊 LTCG Tax Calculator → See all tools
2026
Official IRS Brackets
3
Tax Scenarios Compared
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Cost · Currently Free
Live
Real-time Calculations

Tax Calculators

Pick Your Tool

Interactive calculators built on official 2026 tax data. No login, no ads, no data collected.

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● LIVE
LTCG Tax Calculator Suite
Compare long-term capital gains tax: California + W2 vs. no state tax + no W2. Built on official 2026 IRS & CA FTB brackets with NIIT, standard deductions, and scaling charts. Three perspectives — pick the lens that fits how you think.
★ LTCG Calculator Full experience →
The Complete Explorer
Sliders, dual-scenario panels, NIIT, scaling charts from $100k–$1.2M, and step-by-step calculations. The most interactive lens.
Alt · Basic Another angle →
The Quick Glance
A different take on the same data — streamlined and distraction-free. Fast first read on your tax position, different visual approach.
Alt · Full Another angle →
The Full Picture
Same numbers, different lens — expanded controls and granular breakdowns for when you want to pressure-test every variable your own way.
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COMING SOON
RSU / Stock Options Calculator
Model the tax impact of RSU vesting and NQSO / ISO exercise events. Compare ordinary income vs. LTCG treatment and AMT exposure.
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COMING SOON
Tax-Loss Harvesting Planner
Offset capital gains with harvested losses. Model wash-sale rules, short vs. long-term netting, and net tax savings.
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COMING SOON
Roth Conversion Optimizer
Find the optimal conversion amount to fill lower tax brackets without triggering IRMAA, NIIT, or pushing into the next bracket.
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COMING SOON
Estimated Tax Planner
Calculate quarterly estimated payments for self-employed income, investment gains, and underpayment penalty thresholds.
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COMING SOON
State Tax Comparison
Side-by-side tax burden comparison across all 50 states for a given income profile. Factor in state LTCG, property tax, and AMT.

Why SmartTax

Built for Accuracy

No generic estimates. Every number sourced from official IRS and FTB publications.

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Official 2026 Brackets
Federal rates from IRS Rev. Proc. 2025-32. CA rates from FTB confirmed 2026 schedules.
⚡
Real-time Calculations
Every slider, every keystroke — results update instantly with no server round-trips.
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Standard Deductions Applied
MFJ $32,200 federal and CA $11,412 deductions correctly reduce taxable income before LTCG stacking.
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Scenario Comparison
See exactly how much you save by timing a sale differently — dollars and percentages, side by side.
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Zero Data Collection
All calculations happen in your browser. No accounts, no tracking, no data ever leaves your device.
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Currently Free
No paywalls, no upsells. SmartTax is currently free for individual investors.
⚠️ IMPORTANT LEGAL DISCLAIMER: SmartTax and all its tools are for educational and informational purposes only. Nothing on this website constitutes financial, tax, investment, or legal advice of any kind. Results are illustrative estimates based on publicly available tax data and do not account for your individual circumstances, deductions, credits, or exemptions. Always consult a qualified CPA, tax attorney, or licensed financial advisor before making any financial or tax-related decisions. SmartTax assumes no liability for decisions made based on information provided on this site.