[cko]

> Not investing enough in 401k up to the IRS max.

This is not always a given. If your income in retirement is much higher than your working years income, you will end up losing on taxes.

In fact, my employer didn't match at all so all my money is invested post-tax in a brokerage.

You should probably max out your Roth IRA, however.

[putlake]

Good point. Roth IRA was clearly a miss. It wasn't on my radar since you cannot contribute to it if your income is more than $165,000 (single) or $246,000 (married).