We aren’t willing to pay up front $$ for the benefit of heirs. We don’t have any children. We’d only do this if the numbers show it will benefit us.
So if we contribute $21K and pay 12% federal plus several % state, we’ll have an immediate cost to convert of say $3-$4K. Then if it grows 10% the first year in the Roth, we don’t have to pay tax on $2.1K, a savings of $300-$400. How many years would it take for this to create a significant financial advantage? Seems like it would take 10+ years to break even, considering the time value of money.
You are not going to pay 12% fed tax if you only convert $21K of tIRA and have $80K of LTCGs and QDivs. The 12% bracket is just confusing the issue here because your ordinary income is all in the 0% bracket. What matters to you is the LTCG brackets, which are 0% up to $77.2K and 15% above that.
You first have $24K of standard deduction to use up, so the $21K of ordinary income from the conversion offsets that at 0% tax and leaves you $3k of deductions. Your $80K of LTCGs and QDivs first go against the remaining $3K deduction, leaving $77K. The $77K falls entirely in the LTCG 0% bracket. So your total Fed tax on your $101K income is 0%.
If you convert more than $21K, then you'll pay 25% on the next $19K (10% on the conversion and 15% on the LTCGs that get pushed out of the 0% bracket); and 27% on the subsequent $58K (12% plus 15% as you fill up the 12% bracket with ordinary income).
Sadly, the state of CA will not be as generous, but it's probably still worth it to convert up to $21K.
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