Figuring out the most efficient way to navigate the tax impact of inheriting individual retirement accounts has become more complicated since the Internal Revenue Service issued proposed new rules in February. The rules on inherited IRAs were most recently changed in the 2019 Secure Act, which introduced a new 10-year payout rule for inherited accounts. The previous rule said those who inherited an IRA, Roth IRA or 401(k) could spread out withdrawals over their lifetime.