About StateCalcUSA

What This Site Is

StateCalcUSA publishes free online calculators, reference pages, and letter generators for money and housing questions that depend on state law. The tools cover five areas:

• IRMAA Roth conversion sizing — estimating how a Roth conversion interacts with Medicare income-related surcharges.
• Rent increases — checking caps and notice rules, plus a notice letter generator.
• Probate fees — estimating court fees for an estate, plus an executor checklist.
• Security deposit interest — calculating interest owed on a deposit, plus a demand letter generator.
• Nanny tax — estimating household employer taxes for a nanny or other household employee.

All tools are free, with no account or sign-up. Calculations run entirely in your browser, so nothing you enter is sent to a server or stored. See the Privacy Policy for details.

Who It Serves

StateCalcUSA serves US residents dealing with state-specific money and housing rules: retirees planning Roth conversions, landlords and tenants navigating rent increases, executors handling an estate, renters owed deposit interest, and families employing household help. The site covers the United States only; figures and rules from other countries are out of scope.

How Figures Are Sourced and Verified

Every figure in every tool comes from an official source: a government website, a published statute, or a court fee schedule. Figures are never taken from blogs, forums, or other calculator sites, and no number is invented or estimated where the law states an exact figure.

The sourcing method for each tool is:

1. Identify the official source that states the figure or rule — for example, the statute text or the agency page that publishes the current limit.
2. Record the figure exactly as the official source states it, with the source name, link, and access date.
3. Build the calculator logic from those recorded figures only. If a figure cannot be confirmed in an official source, it is left out of the tool rather than guessed.
4. Show the sources on the page, with a verification stamp giving the date the figures were checked.

Rates and rules verified November 12, 2026 from official sources

Laws, limits, and fee schedules change — often on an annual cycle. Figures are re-checked against the official sources and pages are updated when the law changes. Each tool page shows its own verification date and source list, so you can always see how current a figure is and check it yourself.

Corrections

If you find a figure that appears wrong or out of date, please contact us with the page address and the official source you checked. Reported figures are re-checked against the official source and corrected when the report is confirmed.

Informational Only

StateCalcUSA is an informational website. It does not provide legal, tax, or financial advice, and using a calculator does not create an attorney-client or advisor relationship. Results are estimates based on the figures you enter and the rules in force on the verification date shown. Before acting, verify current law with the official sources cited on each page, and consult a qualified professional for advice about your own situation. Read the full Disclaimer and Terms.