When I moved abroad I had a 401k that I transferred to my brokerage as an IRA. Well it was actually part a trad 401k and part roth 401k that transferred to trad IRA and roth IRA. Now, because I don't have a US taxable income, my idea was to transfer the trad IRA to the roth IRA and just have to pay the 10% penalty as long as the distribution from the trad IRA keeps me under a taxable income level, so like $13k per yr or whatever it is. Can someone please explain to me why I cannot do this without paying more taxes or penalties?