<prompt> Human: Im currently enrolled in a Roth 401k, but Ive received conflicting info on the contribution limit. I know that it is 18,500, but is this pre-tax dollars or is it post-tax dollars? The way I view it, contributions should both be limited on a pre-tax basis, or else you would be able to contribute substantially more to a Roth account each year, but in looking at my account, it seems to be limited on a post-tax basis. I havent been able to find this online and havent gotten a definitive answer from anyone Ive spoken to on it. Any chance one of you know what the limit is based on?  <response>: The pre-tax vs post-tax thing is mostly a misnomer. At the end of the day, you contribute cold, hard dollars. The difference is whether you get a tax break now ie, the amount of your contribution is excluded from your taxes this year but have to pay it later Traditional, or if you just pay taxes like normal now and dont have to pay them later Roth. 