Retirement
How much you need and how to invest toward it.
How much do you need to retire?Estimate your retirement number from target income and Social Security, see where the 4% rule came from, and check the 2026 401(k) and IRA limits.Lump sum or monthly investing?What dollar-cost averaging is, what Vanguard's research found about lump-sum investing, and a worked hypothetical comparing the two.