Professional Pass-Through Tax Platform
Reasonable comp, accountable plans, payroll, and estimated payments — for S-corps and pass-through owners — calculated with citable methodology, exported as client-ready reports, in the minutes you used to spend on a spreadsheet.
Built on the IRS Cost Approach & BLS wage data · No card required to try it
Who it's for
Firms manage every client's compliance from one dashboard. Owners get a simplified, guided version of the same calculations — branded to the firm that referred them.
FOR FIRMS
CPAs, EAs, and preparers: run every pass-through client through the same defensible methodology, without rebuilding the model in a spreadsheet each time.
FOR OWNERS
Understand what your CPA is recommending, track your own reimbursements, and ask the copilot before you ask your accountant.
The problem
Most firms either underpay attention to it or overpay in billable hours getting it right by hand.
RISK
The IRS has reclassified distributions as wages for years when compensation looks arbitrary. A number with no methodology behind it is the first thing an examiner questions.
TIME
A custom model built for one S-corp doesn't transfer cleanly to the next. Firms end up rebuilding the same logic, client after client, in slightly different ways.
TRUST
A number handed down without explanation reads as arbitrary to the client too — and an unexplained number is harder to defend if they're ever asked about it directly.
The platform
Each tool produces a number, and shows exactly how it got there.
MODULE 01
Model the tax savings of an S-corp election for any prospect in seconds. Adjust income and salary split, watch the comparison update live.
MODULE 02
Build an IRS-defensible salary using the Cost Approach — weighted by role, hours, and geographic market wages. Export a signed PDF report.
MODULE 03
Track and document home office, mileage, and cell/internet reimbursements against current IRS rates — and export the corporate resolution that makes it official.
MODULE 04
Per-paycheck federal and state withholding, printable pay stubs, and a deposit-deadline calendar for the owner's W-2 salary. Computes and documents everything — you stay in control of every payment.
MODULE 05
Safe-harbor targets, current-year projections, and all four quarterly due dates — including the December withholding strategy that can replace a Q4 estimate entirely.
MODULE 06
An AI assistant trained on accountable plan rules, reasonable comp standards, and expense characterization — for the questions that come up between meetings.
Why trust the number
Salary is built bottom-up from hours and role, not estimated as a flat percentage of profit.
Role rates are weighted against published Bureau of Labor Statistics medians, adjusted for geography.
Mileage, home office, and substantiation deadlines stay current without you tracking rate changes by hand.
Every module reflects how this work is actually done in practice, not how a generic calculator assumes it's done.
Scope of the platform
PassThrough Engine provides general tax information and modeling tools for educational and planning purposes. It does not constitute legal or tax advice and does not create a CPA-client relationship. Always consult a licensed CPA or tax attorney before making tax elections or entity structure decisions.
Pricing
Firms bill $400–$1,200 per reasonable compensation report. Every plan includes unlimited client logins — your clients' access is part of your subscription, never a separate charge.
Solo practitioners
For one tax professional managing up to 10 pass-through clients.
$79/mo
or $790/yr — 2 months free
Growing firms
For firms managing up to 50 pass-through clients.
$199/mo
or $1,990/yr — 2 months free
Larger firms
Beyond 50 clients, or custom workflows and integrations.
Talk to us
custom volume & onboarding
Questions