Calculators
Work out what a company owes the states and the IRS. Every rate and fee comes from an official page, re-checked every week, and every result shows its working. Free to use, no sign-up.
Everything a company owes the states and the IRS, worked out from official figures.
Annual report
Every annual report and franchise tax your company owes each state, with due dates, fees, late fees and the total for each year.
ExampleDelaware LLC, due every June 1$400You enterStates, entity type, formation dates
Open calculatorFree here · API 1 credit per stateFranchise tax
Your franchise or privilege tax by the state's own formula, including Delaware's assumed par value method and the Texas margin tax.
ExampleDelaware startup with 10 million shares$85,215$450You enterStates, entity type, and the figures each state taxes
Open calculatorFree here · API 1 credit per stateFormation cost
What forming in each state costs in the first year: the filing fee plus every report and tax due, side by side.
ExampleWyoming LLC, first 12 months$160You enterStates to compare, entity type, filing date
Open calculatorFree here · API 1 credit per stateLate filing
What a missed annual report costs to file now, with late fees, and when the state suspends or dissolves the company.
ExampleDelaware LLC, June 1 tax unpaid$600plus interestYou enterState, entity type, the missed due date
Open calculatorFree here · API 1 creditSales tax
Which states your sales make you register in for sales tax, and each state's statewide rate.
Example$620,000 of sales into CaliforniaRegisterYou enterYour sales and orders into each state
Open calculatorFree here · API 1 credit per stateFederal tax
Your federal tax as an LLC, an S corporation or a C corporation, and how much an S corp election would save.
Example$100,000 profit, $40,000 salary, single owner, as an S corp$6,253saved a yearYou enterProfit, your salary, filing status
Open calculatorFree here · API 1 creditIRS penalties
The IRS penalty for filing a business tax return late: Forms 1120, 1065, 1120-S and 5472.
ExampleForm 1065, 3 partners, 4 months late$3,060You enterForm, due date, date filed, number of owners
Open calculatorFree here · API 1 creditUse them in your own app
Send the same inputs to
/api/calc/{name}with an API key and get the result as JSON, with every official number it used and when that number was last confirmed. Never more than 10 credits a call.
Examples use 2026 figures. Results are estimates from official rates and rules, for planning; they aren't tax or legal advice. Each calculator is also an API endpoint.