Pillar 3
Tax calculators
The calculator pillar is live as working product, not just a plan. These tools turn official filing rules, rate tables, and penalty ladders into interactive workflows.
Public calculators
6
Coverage model
Deadline, cost, VAT, penalty
Target scale
200+
state-compliance
California LLC calendar calculator
Generate the main California LLC payment and return dates for a selected tax-year pattern.
state-compliance
Florida annual report cost calculator
Estimate the filing cost of a Florida annual report by entity type and timing.
federal-compliance
Form 5472 deadline calculator
Calculate the regular due date and extension deadline for a Form 5472 filing package.
vat
Switzerland VAT calculator
Calculate Swiss VAT on a net-to-gross or gross-to-net basis using current federal rates.
state-compliance
Texas franchise obligation checker
Check whether a taxable entity is above the Texas no-tax-due threshold and estimate the seeded rate logic.
penalties
UK Self Assessment late-filing calculator
Estimate the late-filing penalty stack for a Self Assessment return.
Important disclaimer
This library is for general tax education only. Always verify filing obligations, due dates, and tax consequences against the cited primary source or with a qualified tax professional.