IRS penalty and interest estimator
See roughly how a balance grows when a return is filed late, the tax is paid late, or both.
IRS payment plan estimator
Estimate a monthly payment, the setup fee, and roughly what the plan costs over time.
S corporation savings calculator
For a profitable LLC or sole proprietor: compare self-employment tax today with payroll taxes if you elected S corporation status and paid yourself a reasonable salary.
2026 quarterly estimated tax calculator
For self-employed people and business owners. Rough federal estimate using 2026 tax brackets and the standard deduction.
Break-even calculator
The heart of any feasibility study: how much you need to sell each month just to cover your costs, and how long your startup cash will last while you get there.
This is general information, not legal, tax, or financial advice for your specific situation. Every case is different. Always check the dates and amounts printed on your own documents.
These calculators give rough estimates for planning. They do not include state taxes, every credit and deduction, or special rules for your situation. Interest compounds daily at the IRS, so actual numbers will differ slightly.
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