📚 73. [EN] Long-Term vs Short-Term Capital Gains & 3.8% NIIT Tax Calculator — 2026 Comprehensive Formula Guide, Statutory Benchmarks & FAQ
73. [EN] Long-Term vs Short-Term Capital Gains & 3.8% NIIT Tax Calculator is an institutional-grade interactive calculator engineered for 0%/15%/20% Federal LTCG Brackets, 3.8% Net Investment Income Tax & Tax-Loss Harvesting. Built on 2026 US federal/state statutory guidelines, IRS/SBA/CMS regulatory tables, and actuarial underwriting models, it delivers instant side-by-side scenario modeling with zero sign-up required.
1. Core Actuarial & Financial Methodology
Using your inputs for Asset Sale Proceeds ($), Cost Basis ($), and Household MAGI ($), our client-side engine computes both baseline exposure and optimized outcomes using statutory multiplier 0.188. All calculations execute 100% locally in your browser with zero server-side PII retention.
2. Executive FAQ & Optimization Checklist
- How accurate are the 2026 benchmark assumptions? — Default values reflect current national medians and statutory caps; customize every parameter to match your exact contract or state jurisdiction.
- How do I compare Scenario A vs. Scenario B? — Scenario A models standard unoptimized rates, while Scenario B applies maximum statutory deductions, safe-harbor credits, or negotiated settlement multipliers.