Retirement Accounts Explained

CW By the CalcWise team · Reviewed for accuracy · Updated Sep 2026 · 7 min read

A 401(k), a Traditional IRA, and a Roth IRA are just containers — the investments inside them can be identical. What's different is when you pay tax on the money.

Why These Accounts Matter

A regular brokerage account is taxed as you go: dividends and gains are taxable most years. Retirement accounts are special because the government lets your money grow with a tax break attached, in exchange for (usually) leaving it alone until retirement age.

401(k) vs. Traditional IRA vs. Roth IRA

401(k)

  • Offered through an employer
  • Often includes a match
  • Higher contribution limit
  • Usually pre-tax (Traditional-style)

Traditional IRA

  • Opened on your own, any brokerage
  • Contributions may be tax-deductible
  • Grows tax-deferred
  • Taxed as income when withdrawn

Roth IRA

  • Opened on your own, any brokerage
  • Contributions are after-tax (no deduction)
  • Grows completely tax-free
  • Withdrawals in retirement: tax-free

Taxed Now, or Taxed Later?

This is the core trade-off between Traditional and Roth accounts:

Traditional Contribute pre-tax → grows tax-deferred → taxed as income when withdrawn Tax later Roth Contribute after-tax → grows tax-free → withdrawals in retirement are tax-free Tax now
Neither is universally "better" — it depends on whether you expect your tax rate to be higher now or in retirement.
A Simple Rule of Thumb If you expect to be in a lower tax bracket in retirement than you are now (common for high earners), Traditional often wins. If you expect to be in a similar or higher bracket later (common early in your career, or if tax rates rise generally), Roth often wins. When in doubt, splitting contributions between both hedges the uncertainty.

What Order to Fund Them

With limited money to go around, most financial planners suggest roughly this order:

  1. 401(k) up to the full employer match — free money first, always.
  2. Max out an HSA, if you have a high-deductible health plan (triple tax advantage, covered in Lesson 6).
  3. Max out a Roth or Traditional IRA — more investment choices and usually lower fees than a workplace plan.
  4. Go back and max out the 401(k) beyond the match, if you still have money left to save.

Key Takeaways

  • 401(k)s, Traditional IRAs, and Roth IRAs are tax-advantaged containers — the underlying investments can be the same.
  • Traditional = tax break now, taxed on withdrawal. Roth = taxed now, tax-free withdrawal.
  • Choose based on whether your tax rate will likely be higher now or in retirement — or split between both.
  • A common funding order: employer match → HSA → IRA → back to maxing the 401(k).

Roth vs. Traditional IRA Calculator Retirement Readiness Planner

Check Your Understanding

Three quick questions — no grades, just a gut check before you move on.

1. With a Traditional 401(k) or IRA, when do you pay income tax on the money?

2. What's the main appeal of a Roth IRA?

3. What should you almost always fund first?

Do This This Week

Reading is step one. Here's what actually moves the needle: