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An employer 401(k) match is an instant, guaranteed return. Here's how match formulas work, how to capture every dollar, and the 2026 contribution limits.

The Roth vs Traditional decision comes down to one thing — your tax rate now versus in retirement. Here's the break-even math and the 2026 limits.

Compound interest pays returns on your returns. Over decades, growth dwarfs contributions — here's the math, with tables showing why time beats timing.

Your FIRE number is your annual spending times 25. Here's how to calculate it, why the multiple is 25, and the levers that get you there sooner.

Coast FIRE is the point where your current investments will grow into a full retirement on their own. Here's how to calculate your Coast number and what it unlocks.

The 4% rule says you can withdraw 4% of your starting portfolio, adjusted for inflation, for about 30 years. Here's where it came from and whether it still holds in 2026.