Utility Pages
Guide · Personal Finance

401(k) vs IRA: Which Account Fits Your Situation

Contribution limits, tax treatment, the funding order most people should follow, and the trade-offs that aren't obvious until you've maxed an account.

The single most common retirement-account question I get from friends in their twenties and thirties is some version of “I have $X to put toward retirement this month — where does it go?” The answer almost never depends on a deep theoretical reading of tax policy. It depends on a handful of practical inputs: whether your employer offers a match, what your current marginal tax rate is, what you expect that rate to be in retirement, and how much flexibility you want before age 59½.

This guide is the framework I walk people through. It covers the real decision tree — not theoretical comparisons — for choosing between 401(k), Traditional IRA, Roth IRA, Roth 401(k), and the SEP/Solo accounts for self-employed people. By the end you'll have a clear order of operations for every dollar you save.

Start with the four account flavors

All of US retirement saving boils down to four buckets, distinguished by who sponsors the account and how the money is taxed:

  • Traditional 401(k): employer-sponsored, contributions reduce current taxable income, withdrawals taxed as ordinary income in retirement. 2026 contribution limit: $23,000 ($30,500 if 50+).
  • Roth 401(k):same employer plan, same $23,000 limit, but contributions are post-tax and qualified withdrawals are tax-free. Note: the $23,000 limit is shared across traditional and Roth 401(k); you can't contribute $23,000 to each.
  • Traditional IRA: opened on your own at any brokerage, contributions may be deductible depending on income and whether you have a workplace plan. Limit: $7,000 ($8,000 if 50+).
  • Roth IRA: opened on your own, post-tax contributions, tax-free qualified withdrawals. Same $7,000 / $8,000 limit. Direct contributions phase out at higher incomes (~$146K–$161K single / ~$230K–$240K MFJ in 2026).

Self-employed and 1099 workers also have access to SEP IRAs and Solo 401(k)s with much higher limits ($69,000 combined in 2026). Those are powerful and badly under-used. I'll cover them in a section below.

The funding order most people should follow

For most W-2 workers I've helped, the answer to “where does this dollar go?” follows the same priority list:

  1. 401(k) up to the employer match.If your employer matches 50% on the first 6%, that's a 50% instant return on your money. There is no other reliably-available 50% return in finance. Funding only enough to capture the full match is the floor.
  2. HSA, if you have a high-deductible health plan.The HSA is the only account in US tax law that's triple-tax-advantaged: deductible going in, growth tax-free, withdrawals tax-free for medical (and after age 65 it functions like a traditional IRA for non-medical withdrawals). 2026 limit: $4,300 single / $8,550 family. If you qualify, this is often more valuable per dollar than additional 401(k) past the match.
  3. Max your IRA — Roth if you qualify, backdoor Roth if you don't.The $7,000 IRA limit is small but the IRA wrapper has more flexibility than the 401(k): broader investment options, no plan fees, easier to manage. Roth IRA contributions (not earnings) can also be withdrawn anytime tax-free, which makes the Roth IRA double as a tier-2 emergency fund.
  4. Max your 401(k) up to the full $23,000. After IRA, return to the 401(k) and fill it.
  5. Taxable brokerage, MEGA backdoor Roth (if your plan supports after-tax contributions and in-service rollovers), or 529 if relevant.

This priority is approximately right for the median W-2 worker. It changes if your employer match is unusually generous (e.g., dollar-for-dollar up to 10% — in that case fund the 401(k) heavier), if you have very high income (mega backdoor Roth becomes far more important), or if you're self-employed (Solo 401(k) replaces the W-2 401(k) in the order).

Roth or traditional? The real test

The Roth-vs-traditional debate gets framed as a deep philosophical question. It isn't. It's a comparison of two marginal tax rates: yours nowversus yours in retirement when you withdraw.

  • If you expect your retirement marginal rate to be lower than your current marginal rate, traditional wins.
  • If you expect your retirement marginal rate to be higher than now, Roth wins.
  • If you genuinely don't know, splitting (some Roth, some traditional) gives you tax diversification — a hedge against future law changes.

Most people overestimate their retirement income and therefore over-Roth. If you're currently in the 22% or 24% federal bracket, your retirement spending will likely come out of money taxed in the 12% bracket (the standard deduction takes the first ~$14,600 to zero, then $11,600 of the next dollars is at 10%, then 12% applies up to ~$47,000). Traditional contributions deducted at 22–24% and withdrawn at 10–12% is straightforward arbitrage in your favor.

Where Roth shines: people in the 12% bracket today (Roth is essentially free tax savings — your current rate is so low that the deduction barely matters), people who will have very large pre-tax balances (RMDs at 73 can push you into higher brackets), and high earners who want estate-planning advantages.

The IRA quirks worth knowing

The deductibility phase-out

Traditional IRA contributions are always allowed, but the deductionphases out if you have a workplace retirement plan and earn above a threshold. In 2026 the phase-out for single filers covered by a plan is roughly $77K–$87K. Above $87K, you can still contribute but it's not deductible.

The Roth IRA income phase-out

Direct Roth contributions phase out at the income ranges noted above. For high earners, the workaround is the “backdoor Roth”: contribute to a non-deductible traditional IRA, then immediately convert to Roth. The IRS explicitly accepts this as long as you don't have a meaningful pre-tax traditional IRA balance triggering the pro-rata rule. If you do, roll the pre-tax traditional IRA into your 401(k) first to clear the path.

Roth contributions vs earnings

One of the most useful features of the Roth IRA is that contributions(not earnings) can be withdrawn at any time, for any reason, with no tax and no penalty. If you contribute $7,000 a year for ten years and the account grows to $90,000, you can withdraw up to $70,000 (your contribution basis) penalty-free. This makes a maxed Roth IRA double as deep emergency reserves, not just a retirement account.

The self-employed accounts most people miss

If you have any self-employment income — a side business, freelance work, a 1099 — you have access to dramatically larger accounts:

  • SEP IRA: contribute up to 25% of net self-employment earnings (after the half-SE-tax deduction), capped at $69,000 in 2026. Easy to open at any brokerage, very simple administratively. The catch: only employer contributions (no employee/Roth contributions).
  • Solo 401(k): employee contribution up to $23,000 ($30,500 if 50+) plus employer contribution up to 25% of compensation, total combined cap $69,000. Allows Roth contributions. Slightly more administrative overhead (Form 5500-EZ once balance exceeds $250K) but much more flexibility.

If your side business nets even $20,000/year, a Solo 401(k) lets you shelter $23,000+ on top of any W-2 401(k) you already have (the $23,000 employee limit is shared across plans, but employer contributions are per-plan). For people with significant W-2 + 1099 income, the combination is one of the highest-leverage tax strategies available.

The contribution limits I've seen people miss

  • The $23K 401(k) limit is per employee, not per plan. If you switch jobs mid-year, your contributions combine across employers. Not stopping at $23K total triggers an excess deferral that has to be cleaned up the following year.
  • Employer contributions don't count toward the $23K limit.Only your contribution counts. The total limit (yours + employer) is $69,000 in 2026 — much higher than most people realize.
  • The IRA limit is shared across Roth and Traditional. $7,000 total, not $7,000 each.
  • You have until tax day, not December 31, to fund an IRA for the prior year.A 2026 contribution can be made through April 15, 2027. Useful when bonuses don't arrive until February.

What I'd tell my younger self

Three things, in priority:

  1. Capture every dollar of employer match, even when cash is tight.I knew people in their first jobs who skipped the 401(k) because the paycheck felt small. They missed a 50% return on the first 6% of salary. Over a decade, that compounds to tens of thousands of unrealized dollars.
  2. Open the Roth IRA before you need it.Once you're above the income limit, direct contributions stop. The backdoor still works but it's annoying enough that people skip it. In your 20s, the contribution is direct and easy. Make the contribution every January, then forget about it.
  3. Don't overthink Roth vs traditional. Pick one based on your current bracket, automate the contribution, and revisit in five years. The marginal-rate decision matters at the edges. The decision to contributeat all is what determines outcomes.

Tools that help

Final thought

The headline numbers — $23K 401(k) limit, $7K IRA limit, $69K Solo 401(k) ceiling — make retirement saving sound complicated. The actual mechanics are simple. Get the match. Use an HSA if you can. Max your IRA. Fill the 401(k). Repeat. The biggest mistakes I see aren't about which account; they're about waiting too long to start, leaving employer match on the table, or constantly re-evaluating the Roth-vs-traditional question instead of just picking one and moving on.