401(k) a tax-advantaged retirement account offered through an employer, often with a match. Where it's taught Retirement Accounts & the Employer Match: The Closest Thing to Free Money Try it with a calculator Retirement Calculator Appears in 17 other lessons The Cost of Waiting: Why a Late Start Costs More Than the Years You SkipIncome & Take-Home PayWhich Dollar Is Worth Most: A Raise, a Side Hustle, or Cutting Costs?Gig Work & 1099s: The Self-Employment Tax SurpriseNet Worth & the Order of Operations: Where Every Dollar Goes FirstBorrowing From Your Own 401(k): The Loan That Sounds FreeYou Just Got a Windfall: Where Should It Go?Dollar-Cost Averaging: Investing Through the Ups and DownsRisk & Return: Volatility Is the Price of GrowthRoth vs. Traditional: Pay the Tax Now, or Later?The HSA: The Only Account With a Triple Tax AdvantageCashing Out a 401(k) When You Leave a Job — vs. Rolling It OverTwo Job Offers: Compare Total Comp, Not SalaryPay Down Debt or Invest? The Guaranteed-Return CrossoverBehavioral Finance: Why We Sell at the BottomCapital Gains: Why Holding On (and Trading Less) Beats the TaxLifestyle Creep: Bank Your Raises or Spend Them? Related terms Employer matchIRARoth (after-tax)Tax dragTax-advantagedTraditional (pre-tax)