When Roths were first introduced, the law contained an enticement to convert from an IRA: Convert all at once and spread the tax bill over four years. I did that with mine, and two years later the tax rate went up so I ended up paying more than I bargained for. Now the rate is even lower than it was back then. On the positive side, the IRA didn't have that much money in it so while the tax percentage was higher than it is now, actual tax dollars paid weren't that great. So yes, it's a crapshoot to decide whether to convert or not. Who knew they would change the rules for inherited Roths? Who knows what tax rates will be in the future or what other rules will change? The fact that RMDs are not required is a big benefit for those who may not need the money, but that's the case today and it too may change. Still, I have no regrets about converting mine. It's nice to know it's there and I can withdraw from it if I choose but never have to withdraw (for now).