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Calculators

Free tools built by the CPA who prepares the returns. Each one lists the rules and figures it uses.

All 12 calculators

Most used

S-Corp vs. Sole Proprietor ›1099 Estimated Tax Planner ›Withholding Checkup ›
When a tool isn’t enoughEvery calculator links to the service or model that covers the rest of the question.Send an inquiry

Models

Excel workbooks for reporting and tax analysis. Licensed per user or firm; you own your copy.

All models

What’s inside

21 tabs, 28,550 formulas (FRP) ›§1374 and LIFO recapture (C→S) ›Pre- and post-2025 §1202 rules ›
Rather have me run it?I can build the reporting package or run the analysis as an engagement.Send an inquiry
Privacy

Privacy notice

Last updated: October 6, 2026. If I change this notice, I'll update this date.

What this site collects

Inquiry form. Your name, your email address, the topic you choose, your message, and, if you came from a calculator or model page, which one. I use this only to reply to your inquiry. The form is delivered through Formspark, and the message reaches me by email. If we don't start working together, I delete the inquiry after 24 months. If we do, it becomes part of the engagement records, which I keep as the engagement letter says.

Calculators. The free calculators run in your browser. Figures you type into them stay on your device unless you choose to send them to me, for example by sending an estimate through the form on a calculator page. A few calculators keep your last result in your browser tab (session storage) so the home-page calculator can show it. It is not sent to me and goes away when you close the tab.

Technical logs. The site is delivered through Cloudflare, which processes your IP address and browser details to serve pages and protect the site. I don't run advertising or analytics scripts, the site sets no advertising or tracking cookies, and I don't track you across other sites, so Do Not Track signals don't change anything.

What I don't do

  • I don't sell your information, and I don't share it for advertising or give it to partners or other marketers.
  • I don't keep inquiry records with client tax files. Client records are kept in separate systems under IRC §7216 and California Business and Professions Code §5063.3.
  • Please don't send tax documents, Social Security numbers or account numbers through this site or by email. If we work together, use the secure client portal.

Email

I only email you in reply to what you send me. If I ever start a mailing list, I'll update this notice first. It would be opt-in, about my services and publications, with my mailing address and a working unsubscribe link in every message.

Your choices

Email info@stillion-acctg.com to ask what I hold about you, to correct it, or to have your inquiry deleted. If you're a California resident, these requests are also your rights under the California Consumer Privacy Act, to the extent it applies. I'll answer within 45 days.