401(k) vs Roth IRA: Which Should You Fund First?
Both are powerful retirement tools but work differently. Learn the optimal funding order and which gives you the best tax advantage.
The optimal funding order for most people is: first contribute enough to your 401(k) to get the full employer match, then max out your Roth IRA, then go back and max out the rest of your 401(k). This sequence maximizes free money from your employer, locks in tax-free growth in the Roth, and shelters as much income as possible from taxes. Here is why this order works and when to deviate from it.
Complete Comparison Table
| Feature | Traditional 401(k) | Roth IRA |
|---|---|---|
| Tax on contributions | Pre-tax (reduces taxable income now) | After-tax (no deduction) |
| Tax on growth | Tax-deferred | Tax-free |
| Tax on withdrawals | Taxed as ordinary income | Tax-free (if qualified) |
| 2026 contribution limit | $23,500 ($31,000 if 50+) | $7,000 ($8,000 if 50+) |
| Employer match | Yes | No |
| Income limits | None | $161,000 single / $240,000 married |
| Required Minimum Distributions (RMDs) | Yes, starting at 73 | No RMDs |
| Early withdrawal penalty | 10% before 59.5 (with exceptions) | Contributions anytime; earnings 10% before 59.5 |
| Loan option | Yes (up to 50% or $50K) | No |
| Investment options | Limited to plan menu | Unlimited (any brokerage) |
The Optimal Funding Order
Here is the recommended sequence for maximizing your retirement savings:
- 401(k) up to the employer match: If your employer matches 50% of contributions up to 6% of salary, contribute 6%. On a $100,000 salary, that is $6,000/year from you and $3,000 from your employer — a 50% instant return. Never leave match money on the table.
- Max out Roth IRA ($7,000): After securing the match, fund your Roth IRA to the limit. Why Roth before additional 401(k)? Tax-free growth is enormously valuable. $7,000/year at 7% for 30 years grows to approximately $707,000 — and you pay zero taxes on withdrawal. Plus, Roth IRAs have no RMDs, better investment options, and more withdrawal flexibility.
- Max out remaining 401(k) ($23,500 total): After the Roth is full, increase your 401(k) contributions to the maximum. The remaining $17,500 (above the $6,000 match threshold) reduces your taxable income and grows tax-deferred.
- Taxable brokerage account: If you have maxed both accounts and still have money to invest, open a taxable brokerage account. Use tax-efficient index funds and hold investments longer than 1 year for lower capital gains rates.
Roth vs Traditional: The Tax Rate Decision
The fundamental question: will you be in a higher or lower tax bracket in retirement than you are today?
- Current tax rate is LOW, future rate is HIGH: Choose Roth. Pay taxes now at the lower rate, withdraw tax-free later.
- Current tax rate is HIGH, future rate is LOW: Choose Traditional 401(k). Deduct now at the high rate, pay taxes later at the lower rate.
- Uncertain: Split contributions between both (many 401(k) plans offer a Roth 401(k) option) for tax diversification.
Most people in their 20s and 30s should favor Roth contributions because:
- They are likely in lower tax brackets early in their career
- Tax rates may rise in the future to address national debt
- Decades of tax-free compound growth is extremely valuable
- No RMDs means more control over retirement income and taxes
Income Phase-Out for Roth IRA (2026)
You cannot contribute directly to a Roth IRA if your income exceeds the limits:
| Filing Status | Full Contribution | Reduced Contribution | No Contribution |
|---|---|---|---|
| Single | Under $150,000 | $150,000 - $161,000 | Over $161,000 |
| Married filing jointly | Under $230,000 | $230,000 - $240,000 | Over $240,000 |
If your income is in the phase-out range, your allowed contribution is reduced proportionally. If over the limit, you cannot contribute directly — but you can use the backdoor Roth strategy.
The Backdoor Roth Strategy
If your income exceeds Roth IRA limits:
- Contribute $7,000 to a Traditional IRA (non-deductible, since you have a 401(k))
- Convert the Traditional IRA to a Roth IRA (pay taxes on any gains)
- If done immediately, there are minimal or no gains to tax
This is legal and widely used by high earners. The key caveat: the pro-rata rule applies if you have existing pre-tax Traditional IRA balances. To avoid complications, roll any existing Traditional IRA money into your 401(k) before executing the backdoor conversion.
Growth Comparison: 30 Years
Assume $23,500/year to a Traditional 401(k) vs $23,500/year to a Roth 401(k) (some of which goes to taxes), 7% return, 30 years:
| Scenario | Annual Contribution | Portfolio at 60 | Taxes on Withdrawal (22%) | After-Tax Value |
|---|---|---|---|---|
| Traditional 401(k) | $23,500 pre-tax | $2,370,000 | $521,400 | $1,848,600 |
| Roth 401(k) | $23,500 after-tax | $2,370,000 | $0 | $2,370,000 |
The Roth comes out ahead by $521,400 because withdrawals are completely tax-free. However, the Traditional lets you invest the tax savings today — if you invest that difference in a taxable account, the comparison narrows. The Roth still wins for most people because of the tax-free compounding and no RMDs.
When to Prioritize Traditional 401(k) Over Roth
The traditional approach wins in specific situations:
- You earn over $200,000 and are in the 32%+ tax bracket, and you expect to be in a lower bracket in retirement
- You are close to retirement (within 10 years) and in peak earning years
- Your state has high income tax now but you plan to retire in a no-income-tax state
- You need to reduce current AGI for other tax benefits (child tax credits, education credits, ACA subsidies)
Practical Takeaway
For most workers under 50: contribute to your 401(k) up to the employer match, max out a Roth IRA, then increase 401(k) contributions as high as you can afford. This three-step approach captures free employer money, locks in tax-free growth, and maximizes your total retirement savings. Use our retirement calculator to model how different contribution levels and tax scenarios affect your projected retirement balance.
Try it yourself
Run the numbers with our interactive calculator — drag a slider and watch the chart update instantly.
Open calculatorThis article is for educational purposes only and does not constitute financial advice. Consult a licensed financial advisor for decisions specific to your situation.