If you can invest $500 a month, do not start by opening a random brokerage app. In the U.S., the account type often matters more than the fund you pick — because of the employer match, taxes, and IRS limits. Investor.gov’s 401(k) overview is a clean, government-written primer.
That order is not a personality test. A 50% or 100% match is an instant return you will not get in an IRA. After the match, a Roth IRA usually wins on flexibility and investment choice. After that, the 401(k)’s higher limit is how you actually put away serious money.
2026 contribution limits
These are the employee numbers most people need. They change most years; this table follows the IRS 2026 401(k) and IRA limit announcement.
| Account | 2026 limit | Age 50+ catch-up |
|---|---|---|
| 401(k), 403(b), most 457 plans (your deferral) | $24,500 | $8,000 ($11,250 if you are 60–63 and the plan allows) |
| IRA or Roth IRA | $7,500 | $1,100 |
| 401(k) employee + employer combined | $72,000 | Catch-ups can sit on top of this |
$500 a month is $6,000 a year — under the IRA cap, and nowhere near the 401(k) cap. You can (and often should) use both in the same year. The limits do not compete with each other.
Step 1: Take the match. It is free money.
If your employer puts in 50 cents or a dollar for every dollar you defer, up to 4% or 6% of pay, that match is the highest-confidence return in personal finance. Contribute at least enough to get all of it before you fund anything else besides high-interest debt and a basic emergency fund.
Example: you earn $70,000. A 100% match on the first 4% of pay is $2,800 a year from the company. Skipping the 401(k) to “invest on your own” leaves that $2,800 on the table.
Step 2: Roth IRA, if you can use one
A Roth IRA is funded with money you already paid tax on. Qualified withdrawals in retirement are tax-free. You can also withdraw contributions (not earnings) without tax or penalty, which is why a lot of households treat it as a backup after the emergency fund — not a replacement for one. The IRS page on traditional and Roth IRAs is the source of record for contribution and income rules.
For 2026, the ability to contribute phases out at modified AGI of $153,000–$168,000 if you are single, and $242,000–$252,000 if you are married filing jointly. Above the top of the range, you cannot contribute directly. Higher earners sometimes use a backdoor Roth; that is a tax-form trick, not a loophole you should copy from a blog post without a CPA.
IRA investments are usually broader than a typical 401(k) menu: low-cost index funds at Vanguard, Fidelity, or Schwab, including whole-market funds like VTI. If your 401(k) is full of high-fee target-date funds, the IRA is where you keep costs down.
Step 3: Go back to the 401(k)
After the match and the IRA, extra dollars still belong in tax-advantaged accounts. The 401(k) is how you get from $7,500 a year to $24,500. Payroll deferral also makes “pay yourself first” automatic — the money never hits checking.
Traditional 401(k) contributions lower taxable income this year. That is valuable if you are in a mid or high bracket now and expect a lower bracket in retirement. Roth 401(k), if your plan offers it, is the opposite: no deduction now, tax-free later. You can split the $24,500 between them.
Traditional 401(k) vs Roth IRA, side by side
| Traditional 401(k) | Roth IRA | |
|---|---|---|
| Tax on the way in | Deferred (you get a deduction) | You already paid income tax |
| Tax on qualified withdrawals | Ordinary income | Usually none |
| Employer match | Yes, if offered | No |
| 2026 employee / IRA cap | $24,500 | $7,500 |
| Early access | Harsh penalties in most cases | Contributions can be withdrawn |
| Required minimum distributions | Yes, eventually | Not during the original owner’s life |
When to break the default order
- Credit cards above ~8–10%: pay those before extra investing. A match can still come first. Details in emergency fund vs investing.
- You expect a much higher tax bracket later: lean Roth (Roth IRA and/or Roth 401(k)).
- You expect a lower bracket in retirement: traditional 401(k) is doing real work.
- Your 401(k) options are terrible: still take the match, then prefer the IRA for the rest until you change jobs or the plan improves.
- You are over the Roth income cap: traditional 401(k) or Roth 401(k) still work; a backdoor Roth is a separate conversation with a tax pro.
What $500 a month actually does
$500 a month is $6,000 a year. That can be the Roth IRA for the year, with a little left over, or part of a 401(k) deferral on top of a match. Plug $500 into the compound interest calculator and look at 20–30 years, not 12 months. The account wrapper does not change the compounding math — taxes and the match do.
Frequently asked questions
Can I contribute to both in the same year?
Yes. The 401(k) limit and the IRA limit are separate.
Should I pause my 401(k) to fill a Roth IRA?
Not if it means losing the match. After the match, shifting new dollars to a Roth IRA for a few months is reasonable.
Is a Roth 401(k) the same as a Roth IRA?
Same tax idea, different rules. Roth 401(k) uses the big 401(k) limit and your plan’s fund list. Roth IRA uses the IRA limit, income caps, and almost any brokerage fund.
