Tax Law Calculators United States

About our Tax Law calculators for United States

LexScale.ai offers 15 free tax law calculators for United States — part of the largest free legal-calculator library in North America, with 400+ tools across 23 practice areas, every one available in Canadian and US versions. Each tax law calculator gives an instant, private estimate using current United States statutory rates and standard legal formulas, with no signup and nothing sent to a server.

What you can calculate

IRS Failure-to-File Penalty Calculator · Tax Audit Risk Score Calculator · Sales Tax on Legal Services Calculator · Payroll Remittance Calculator · IRS Payment Plan Estimator Calculator · Income Tax Estimator Calculator · Capital Gains Tax Calculator · Self-Employment Tax Calculator · Payroll Deductions Calculator · Sales Tax Calculator US by State · Estimated Tax Payment Calculator · 401k Contribution Limit Calculator · Dividend Tax Calculator US Qualified · Late Filing Penalty Calculator US IRS · Tax Refund Estimator Calculator

How accurate are they?

Our tax law calculators use up-to-date statutory rates, provincial and state data, and the same formulas lawyers and courts rely on. They are designed for planning and research — actual outcomes depend on your specific facts, jurisdiction, and judicial or agency discretion. Rates are reviewed and updated as laws change. For decisions that matter, confirm the numbers with a licensed lawyer.

Canada and United States coverage

Legal rules differ sharply between the two countries, so every tax law calculator is built in a Canadian version (using provincial rules) and a US version (using state-level rules). You are viewing the United States edition; switch countries any time from the calculator hub.

Free to embed

Law firms and legal sites can embed any of these tax law calculators free — each has a one-click embed that drops an interactive widget onto your own site, with a "Powered by LexScale.ai" link and no API key required.

Tax Law Calculators — FAQ

Are these tax law calculators free?

Yes. Every tax law calculator on LexScale.ai is 100% free, needs no signup, and runs entirely in your browser — nothing you enter is sent to a server. You can use them as many times as you like.

Do these calculators work for United States?

Yes — this page is the United States edition. Each tax law calculator uses United States-specific rules, and most are also available in the other country's version. Results reflect current statutory rates and standard legal formulas for United States.

How accurate are the tax law calculators?

They use current United States statutory rates, provincial/state data, and standard legal formulas to give reliable planning estimates. Exact outcomes depend on your facts, jurisdiction, and the discretion of courts or agencies, so confirm important numbers with a qualified lawyer.

Can I embed these tax law calculators on my law firm website?

Yes. Every calculator has a free embed option — click 'Embed this calculator' on any calculator page to copy an iframe snippet. It includes a 'Powered by LexScale.ai' attribution link, and no API key or account is required.

Which tax law calculator should I use?

Start with the one that matches your question. This section includes IRS Failure-to-File Penalty Calculator, Tax Audit Risk Score Calculator, Sales Tax on Legal Services Calculator, Payroll Remittance Calculator and more. Each calculator explains what it estimates and links to related tools so you can move between them.

Are these calculators legal advice?

No. They are free educational estimating tools, not legal advice, and do not create a lawyer-client relationship. For advice on your specific situation, consult a licensed lawyer in your jurisdiction.

Tax Law Calculators — United States