Your life belongs to you. Government, through taxation, places a claim on it. I think you can do the math from there.

Btw, have you read the sword of truth series by Terry Goodkind?
Ayn Rand was against taxation
http://aynrandlexicon.com/lexicon/taxation.htmlHuh. I wonder if she'd ever come across "The production of security" by Gustave de Molinari.
In a fully free society, taxationor, to be exact, payment for governmental serviceswould be voluntary. Since the proper services of a governmentthe police, the armed forces, the law courtsare demonstrably needed by individual citizens and affect their interests directly, the citizens would (and should) be willing to pay for such services, as they pay for insurance.
No, I haven't read it.
Goodkind's an objectivist. He does the same thing Rand did, but with dragons and magic instead of trains and metal. Better story, and less preaching, too.