Contact

Last reviewed: August 2026

Get in touch

What I would genuinely like to hear about

Errors in the tax logic

This is the most valuable thing you can send. The calculator models intricate rules — IRMAA lookbacks, the Social Security taxability worksheet, the pro-rata basis rule — and tax law is not written to be easy. If a number looks wrong, tell me.

What helps most: the inputs you used, the figure the calculator produced, the figure you expected, and a citation if you have one. A specific IRS publication or revenue procedure reference makes a correction quick; a general "the numbers seem off" is hard to act on.

Tax law changes

Figures shift every year, and some provisions have expiry dates already on the calendar — the senior bonus deduction ends after 2028. If you spot something that has changed and not been updated here, that is worth an email.

Bugs and things that do not work

Broken behaviour, layout problems, anything that fails on your browser or device. Please say which browser and roughly what you were doing.

Suggestions

Cases the model does not handle that you think it should. No promises, but the list of what to build next is genuinely shaped by what people ask for.

What I cannot help with

I cannot give you tax or investment advice. I am not a CPA, an enrolled agent, a tax attorney or a financial advisor. I cannot tell you whether to convert, how much to convert, or what is right for your situation — and I would be doing you a disservice if I tried.

Questions I will not answer, and why:

"Should I convert?" — That depends on your health, your plans, your other assets, your heirs and your tolerance for paying tax early. The calculator shows you the shape of the decision. A qualified professional who knows your circumstances should help you make it.
"Is this number right for my return?" — I have no way to verify your inputs and no professional standing to confirm anything. Check it against your own return or your preparer's software.
Anything involving your actual account balances or personal details — please do not send them. I do not want them, I have no secure way to handle them, and the site is built specifically so that nobody ever has to share them.

For advice on your own situation, a CPA or a fee-only fiduciary advisor is the right call. Fee-only means they are paid by you rather than by commission on products they sell — worth knowing when the subject is your retirement savings.

A note on privacy

The calculator collects nothing and transmits nothing — see the privacy policy. Email is different: if you write to me, I will have your email address and whatever you put in the message. I will use it to reply and nothing else. I will not add you to a list, because there is no list.