Free calculators & letter generators
Free State-by-State Money & Housing Calculators
Clear answers on IRMAA, rent increases, probate fees, deposit interest and nanny tax — built from official sources and calculated privately in your browser.
✓ Verified Nov 12, 2026✓ No sign-up✓ Private by design
The short answer: StateCalcUSA offers free calculators and letter generators for US residents covering IRMAA Roth conversions, rent increases, probate fees, security deposit interest, and nanny tax. Every figure comes from an official government or statute source, and every calculation runs in your browser — nothing you enter is sent anywhere.
This tool is for information only. It is not legal, tax, or financial advice. Verify current law with the official sources cited before acting.
Calculators and Generators
IRMAA Roth Conversion Sizer
Size a Roth conversion against Medicare IRMAA income thresholds, with a plain-English summary of the result.
Rent Increase Checker
Check whether a rent increase follows the cap and notice rules that apply in your state.
Rent Increase Notice Letter Generator
Generate a rent increase notice letter with the figures and notice period your state requires.
Probate Fee Calculator
Estimate probate court fees for an estate based on the fee schedule in the state where it is filed.
Executor Checklist
A step-by-step checklist for executors, from the first filings through closing the estate.
Security Deposit Interest Calculator
Calculate the interest owed on a rental security deposit under your state’s rules.
Security Deposit Demand Letter Generator
Generate a demand letter for the return of a security deposit, citing the applicable state rule.
Nanny Tax Calculator
Estimate household employer taxes for a nanny or other household employee, including state requirements.
How We Verify Every Figure
StateCalcUSA uses official sources only: government websites, published statutes, and court fee schedules. No figure is taken from a blog, a forum, or an estimate, and no number is invented. If a figure cannot be confirmed in an official source, it does not appear in a calculator.
Rates and rules verified November 12, 2026 from official sources
Each tool page lists the sources behind its figures, with links and the date they were accessed, so you can check any result yourself. Laws, limits, and fee schedules change — often annually — so figures are re-checked against the official sources and pages are updated when the law changes. If you spot a figure that looks out of date, contact us and it will be re-checked. Read more on the About page.
Browse by Topic
- Probate Fees by State — compare probate court fee schedules across states.
- Security Deposit Interest by State — compare state rules on deposit interest.
- Nanny Tax by State — compare state household employer requirements.
Rent Increase Rules by State
Frequently Asked Questions
Are the calculators on StateCalcUSA free to use?
Yes. Every calculator and letter generator on this site is free, with no account or sign-up required.
Do my inputs leave my device?
No. Every calculation runs entirely in your browser. Nothing you type is sent to a server, stored, or shared.
Are the results legal or tax advice?
No. Results are estimates for information only and are not legal, tax, or financial advice. Verify current law with the official sources cited on each page before acting.
How current are the figures in the calculators?
Figures were verified November 12, 2026, from official government and statute sources. Laws and limits change, so each page lists its sources and verification date.
Which states do the tools cover?
Coverage varies by tool. Some tools cover every state, while others cover only the states where verified figures apply. Each tool states its coverage on the page.
What should I do if a figure looks wrong?
Check the official source linked on the page, and contact us through the contact page so the figure can be re-checked and corrected.