Tax services
Tax calculators.
Two working estimates for the two questions every US founder eventually asks: what will I owe in federal income tax, and how much sales tax do I collect for the state. Live, in your browser, nothing to register.
What you'll owe.
A working estimate of your federal income tax based on entity type and 2025 brackets. State income tax not included; self-employment tax and deductions excluded for clarity.
Income Tax Calculator · 2025 brackets
Estimated federal tax
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These figures estimate federal income tax only. Your actual return will reflect deductions, credits, state income tax, and (for active partners and S-Corp owners) self-employment tax. We file the real thing in our income tax service.
What the state collects.
A rough estimate of state-level sales tax owed on taxable revenue. Local city, county, and transit surtaxes can add 1–4% on top in many jurisdictions.
Sales Tax Calculator · 50 states
Estimated state sales tax
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Florida state base rate. Local surtaxes add up to a few additional percent in most cities.
Local rates (city, county, transit) layer on top of the state base rate and vary by exact address. We file actual sales tax returns in any state in our sales tax service.
Frequently asked
The fine print.
Are these the actual numbers I'll owe?+
No. They're working estimates. The calculators use 2025 federal brackets and state base rates, but they don't model self-employment tax, deductions, credits, state income tax, or local sales surtaxes. Your actual return reflects all of those. We file the real thing for you in our income tax and sales tax services.
What's the difference between LLC pass-through and C-Corp tax?+
An LLC's profits flow to the owners' personal returns and are taxed at individual brackets (10% to 37%). A C-Corp pays its own flat 21% corporate rate, and shareholders then pay personal tax on dividends: the source of what's commonly called double taxation. Pick the calculator's entity type to see which applies to your situation.
Why does the income calculator ask my filing status?+
Because pass-through profits land on your personal return, which uses different bracket schedules for Single vs Married Filing Jointly. The numbers shift meaningfully between the two, so the calculator asks before estimating.
What's nexus and why does it matter for sales tax?+
Nexus is the legal connection that obligates you to collect a state's sales tax. It can be physical (an office, employees, inventory in the state) or economic (sales above a threshold, often $100k or 200 transactions per year). The calculator assumes you have nexus in the state you select and shows the rate on revenue in that state alone.
Why are some states 0%?+
Five US states have no state-level sales tax: Alaska, Delaware, Montana, New Hampshire, and Oregon. Some of them (notably Alaska) still allow local jurisdictions to charge sales tax, but the state itself does not.
Do these calculators store my numbers?+
No. Everything is computed in your browser. The values you type never leave your device, are never sent to a server, and are not stored anywhere. Refresh the page and they're gone.
These are estimates. We file the real thing.
The calculators place you within range. Our tax team delivers the actual return, with deductions found and obligations met. Twenty-four years of doing precisely this.
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