If your old accounts are not Roth IRAs then you need to consider the tax ramifications of rolling them into a Roth. Since regular IRA contributions are tax-deductible and Roth contributions are not(tax benefits come on withdrawal) you would have to pay taxes on the $15K and then roll the remainder into the Roth. I guess I would recommend picking the account that you like more(Pera or TIAA) and roll the other one into it. That would limit your accounts but also give you some diversification.





