Back Door Roth - Taxes

[Nabeel_TT]

I recently converted a traditional Roth to Backdoor Roth.  The funds in Traditional Roth were post taxes. However it did include capital gains. So I would have tax liability.  How do I calculate the liability and how o I pay taxes on this conversion (So that I dont get under payment liability)?

[fanfare]

"I recently converted a traditional Roth to Backdoor Roth"

Since there is no such concept with IRAs, it is not clear what you think you did.

Only a Traditional IRA,  can be converted to a Roth IRA.

Assuming you mean Traditional IRA to Roth IRA,

Enter your 1099-R, hit CONTINUE then tell TurboTax you converted the amount to a Roth.

If you did this in 2021, your conversion is taxable,

so make an estimated tax payment of 22%, or whatever your top tax rate is.

There's no concept of capital gains in an IRA.

if you have a basis your basis-not-taxed is prorated against your total IRA value.