Calculators
Each one runs the same engine the product runs, and each shows the rule and the citations behind its answer. Free, and nothing to sign up for.
Average stay calculator
Total nights divided by number of reservations — the formula the seven-day test actually uses, and the one most calculators get wrong.
Material participation test checker
All seven tests of Reg. §1.469-5T against your hours, including the 100-hour race against the single busiest other worker.
Material participation log template
A spreadsheet with the columns the case law asks for — start and stop times, what was done, and who else worked. No email wall.
For a whole year modelled end to end — depreciation, the loss limits, state add-backs — use the estimator.