employer-match

A retirement account is not an investment — it's a tax-advantaged container you put investments inside. Get the container right and the same stocks and bonds build far more wealth. Two ideas carry the lesson. First, the employer match: many employers add money to your 401(k) when you contribute — say 50 cents per dollar, up to a limit. That is an immediate, guaranteed return on day one, before the market does anything, and then it compounds for decades. Not contributing enough to get the full match is the rare case of literally leaving free money on the table. Second, tax-advantaged growth: a traditional 401(k)/IRA lets you contribute pre-tax dollars (so more money goes to work) and defers all tax until you withdraw in retirement; a Roth is the mirror image — you pay tax now and withdraw completely tax-free; and both avoid the yearly tax drag a taxable brokerage account pays on its dividends and gains. The traditional-vs-Roth choice turns almost entirely on one question: will your tax rate be higher or lower in retirement than it is today? If lower, traditional wins; if higher, Roth wins; if about the same, it's a wash and the match is what matters. The simulator grows one pre-tax contribution three ways — a taxable account, a tax-advantaged account with no match, and one with the match — so the tax-shelter wedge and the free-money wedge are both visible, then reports the after-tax outcome for each. The durable lessons: always contribute at least enough to capture the full match; use tax-advantaged accounts before taxable ones; and pick traditional vs Roth based on your expected future tax rate.