How much you made or how much you contributed or how much you took out? You only enter 401K contributions from your W2. You don't enter any interest, dividends, buys or sells or values inside the 401K. And you don't report loans unless you leave and don't pay it back.
You only report distributions, withdrawals, rollovers, Transfers to another account or conversions. You will get a 1099R for those.
