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[[ also have a 401k from a previous employer and am considering rolling it over into a Roth IRA.
My question is about how I calculate the total taxes (income and capital gain) I will owe when I do
the roll-over. I'm in the 28% tax bracket. ]]

Really, the ONLY way to find out is to do a "dummy" tax return, using the effective tax rates and brackets available to you.

[[For the income tax portion do I just multiply my (pre-tax contributions + employer matching) by
0.28. ]]

That will provide you with a ROUGH idea...perhaps. Assuming that the addition of the rollover funds doesn't kick you up into the next tax bracket. And the only way that you can find this out is to review your total income plus the additional rollover income, less your itemized deductions, review your brackets and estimate your tax.

[[And for the capital gain portion do I subtract my (pre-tax contributions + employer matching) from
my total portfolio value and multiply that by 0.28.]]

You'll have no capital gain portion. Once you roll over your 401k amounts into an IRA rollover, all of the subsequent income recognition will be at "ordinary" tax rates.

TMF Taxes

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