Free visitor
$0no account
- Complete private Tax Lab
- All foundational concept references
- Introductory course module
- Marginal-brackets interactive lesson
- Progress on this device
One paid membership
Free to explore. Paid to learn deeply and keep your work.
No free account tier and no calculator paywall. Paid membership activates the workspace that holds course progress and personal planning scenarios.
Full membership
One plan$49per year
The complete educational course and a private, cloud-synced planning workspace maintained alongside annual tax-rule updates.
- All 12 interactive lessons and future additions
- Synced progress across devices
- Unlimited named plans and scenario branches
- Calculation-level comparison and revision history
- Bracket-headroom planning explorer
- CSV export, print package, and expiring share links
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Education and application stay connected
Every saved plan uses the same calculation trace taught by the course, so personal results remain explainable.
History remembers the assumptions
Revisions preserve inputs, outputs, notes, and the rule version instead of silently recalculating old decisions.
Annual maintenance has a purpose
Membership supports current rules, new annual lessons, and comparisons that distinguish assumption changes from rule changes.