Any good Roth conversion estimator websites ?

[pb4uski]

If T=R and taxes are paid from the conversion amount... IOW, the conversion is really a withdrawal of $2,200 to pay the tax and a conversion of $7,800... the tIRA goes down by $10,000 and the Roth goes up by $7,800 and $2,200 goes to tax... then there is no detriment or benefit in theory.

If over x years the tIRA doubles from $10k to $20k, the after-tax balance would be $15.6k or if you convert today and over x years the Roth IRA doubles it would be $15.6k.

 

[SevenUp]

I would not be paying conversion tax from a taxable account. The rationale for doing that seems to be wrapped up in maximizing Roth contributions (as per the link to the Boglehead wiki) but that does not apply to my situation.

BTW, that link leads to a portfolio modeling/tracking spread sheet for anyone to use, that is pretty impressive.

When comparing traditional vs. Roth when Roth contributions are maximized, the traditional side is actually a combination of traditional and taxable. In that case, if there is any tax drag on the taxable account, Roth comes out ahead even with equal contribution and withdrawal tax rates.

Similarly, with traditional to Roth conversions, if one maximizes the Roth amount by taking money from taxable to pay the conversion tax, that beats paying the tax from the traditional amount and thus not maximizing the Roth amount.