Run the numbers yourself.
The same math we run on planning calls, as free calculators. No email gate, no signup. Everything computes in your browser and nothing you type leaves it.
Overemployed Tax Estimator
Project your 2026 balance from each job's paystub, claim the excess Social Security credit your extra jobs earn, and get the exact W-4 fix per paycheck.
Open calculator →RSU Tax Withholding Calculator
Payroll withholds RSUs at a flat 22% while your real bracket may be 32% or higher. See the size of your April gap before it arrives.
Open calculator →ISO AMT Crossover Calculator
Exercising incentive stock options is tax-free until tentative minimum tax crosses your regular tax. Find the exact share count where it flips.
Open calculator →Safe Harbor Estimated Tax Calculator
Find your cheapest IRS safe harbor (90% current year or 100%/110% prior year), what your withholding covers, and what's left by each deadline.
Open calculator →Solo 401(k) vs SEP IRA Calculator
Your real 2026 contribution maximum under each plan, Keogh math included, with correct coordination when you also have a 401(k) at a day job.
Open calculator →Entity IQ
Our full S-Corp viability app lives at its own address. It runs the self-employment tax math, models reasonable compensation, and tells you in dollars whether the election pays.
Estimates are free. Certainty is thirty minutes.
Every tool here simplifies on purpose. When the number is big enough to matter, we run it on your actual facts, brackets, states, and all.