Rate Calculator What Is The Marginal Tax Rate On An IRA Calculator?

What is the marginal tax rate on an IRA calculator? - rate calculator

I have a Roth IRA and wanted to know how much money would be made to see in 31 years (when I'm 70), if I contribute the maximum amount per year. I was in the category of "marginal tax" confused, because I am something that you retire after age 59 was conceived free from tax.