All three of these accounts do the same basic job: shelter your investments from taxes so compounding works harder. The difference is when you pay the tax — now (Roth) or later (traditional/401(k)). Getting this choice right, and stacking accounts in the right order, is one of the highest-leverage financial decisions most people never sit down to actually think through.
The three core accounts
Offered through your employer (or 403(b)/457/TSP equivalents). Contributions come straight out of your paycheck, often with an employer match — essentially free money. Traditional contributions are pre-tax; Roth 401(k) contributions are after-tax and grow tax-free.
An account you open yourself, independent of any employer. Contributions may be tax-deductible depending on income and workplace plan coverage. Grows tax-deferred; withdrawals in retirement are taxed as ordinary income.
Also opened independently, funded with after-tax dollars. No upfront deduction, but qualified withdrawals in retirement — including all the growth — are completely tax-free. Eligibility phases out at higher incomes.
2026 contribution limits
These are set annually by the IRS and increased for 2026:
| Account | Standard Limit | Catch-Up (50+) | Catch-Up (60–63) |
|---|---|---|---|
| 401(k) / 403(b) / 457 / TSP | $24,500 | +$8,000 ($32,500) | +$11,250 ($35,750) |
| IRA (Traditional + Roth combined) | $7,500 | +$1,100 ($8,600) | Same as 50+ |
The IRA limit is a combined cap across all your traditional and Roth IRAs — not $7,500 in each separately.
Roth IRA income phase-outs for 2026
- Single / head of household: full contribution under $153,000 MAGI, phased out between $153,000–$168,000, disallowed above.
- Married filing jointly: full contribution under $242,000 MAGI, phased out between $242,000–$252,000, disallowed above.
A mandatory change for high earners in 2026
Under SECURE 2.0, if you earned more than $150,000 in FICA wages from your employer in the prior year, your catch-up contributions (age 50+) must go into a Roth account rather than pre-tax. This is now mandatory, not optional, for affected high earners.
Traditional vs. Roth: the real decision
This comes down to one question: do you expect to be in a higher or lower tax bracket in retirement than you are right now?
- Expect a lower bracket in retirement (common for most career-stage savers): traditional accounts often win — you get the deduction now while your rate is higher, and pay tax later at a lower rate.
- Expect a higher bracket in retirement, or want tax certainty: Roth often wins — you lock in today's tax rate on contributions and never pay tax on the growth, regardless of future rate changes.
- Not sure: many people split contributions between both to hedge against uncertainty in future tax policy and their own income trajectory.
Free Tool
See what compounding does to either account type
Model your contributions and timeline to see how the growth plays out before taxes come into the picture.
Open the Compound Interest Calculator →The order most financial advisors recommend
- Contribute enough to your 401(k) to get the full employer match. This is an immediate, guaranteed return — often 50-100% on the matched dollars — that beats almost any other financial move available to you.
- Max out a Roth IRA (or traditional, based on the decision above) if you're within income limits — IRAs typically offer more investment choice and lower fees than employer plans.
- Go back and max out the 401(k) up to the full $24,500 limit if you still have capacity.
- Consider a backdoor Roth or mega backdoor Roth if you're a high earner above the Roth IRA income limits — contributing after-tax dollars and converting them, which lets high earners still access Roth growth.
Why account type matters more than people think
The same $500/month invested for 30 years at a 7% return grows to roughly $610,000 regardless of account type — but what you actually keep of that differs enormously:
Traditional 401(k)/IRA: the full $610,000 is taxed as ordinary income as you withdraw it.
Roth 401(k)/IRA: the full $610,000 comes out completely tax-free.
The tax treatment isn't a minor detail — it's the difference between keeping the full number and losing a meaningful chunk of it to future tax brackets you can't fully predict today.
Mistakes people make with these accounts
- Not contributing enough to get the full employer match. Leaving match money on the table is turning down a guaranteed 50-100% return before you've invested a dollar of your own money at risk.
- Cashing out a 401(k) when changing jobs instead of rolling it over — this triggers taxes and an early-withdrawal penalty on money that could have kept compounding tax-sheltered.
- Ignoring the Roth catch-up rule if you're a high earner over 50. Since 2026, this isn't optional for anyone earning over $150,000 in FICA wages — check whether your plan even offers a Roth option before you hit this wall.
- Treating early withdrawal as a planning strategy rather than a last resort. The 10% penalty plus ordinary income tax is a steep price for accessing money early.
Frequently asked questions
Can I contribute to a 401(k) and an IRA in the same year?
Yes — they have separate limits and aren't combined. You can max both in the same year if you have the income and capacity to do so.
What happens to my 401(k) if I change jobs?
Your 401(k) doesn't disappear — you can typically roll it into your new employer's 401(k) or into an IRA (a rollover IRA) without triggering taxes, as long as it's done correctly through a direct rollover rather than cashing out.
Is there a penalty for early withdrawal from a retirement account?
Generally yes — withdrawals before age 59½ from most retirement accounts incur a 10% penalty on top of any regular income tax owed, with some exceptions such as a first-time home purchase for Roth IRA up to $10,000 lifetime, and certain hardship provisions. Early withdrawal should be a last resort, not a planning strategy.
Does my employer's 401(k) match count toward my contribution limit?
No — the employee contribution limit of $24,500 for 2026 applies only to what comes out of your own paycheck. Employer matching is separate and doesn't count against your personal limit, though there's a much higher combined employee-plus-employer cap of $72,000 for 2026 for most plans.
This article is for educational purposes and does not constitute financial or tax advice. Contribution limits and phase-out ranges are set annually by the IRS and subject to change — verify current figures at irs.gov before making contribution decisions.