Should I max my 401(k) after a raise?
The 401(k) advice in most personal finance articles boils down to "contribute up to the match, then max if you can." That's fine as a default, but it ignores the actual tax math and the opportunity cost. Whether you should max after a raise depends on your bracket, your emergency fund, your debt, and whether you're saving for a house. Here's the real framework.
The 2026 IRS contribution limits (IRS Rev. Proc. 2025-32):
- Employee contribution: $24,500
- Catch-up for age 50+: $8,000 (total $32,500)
- Super catch-up for age 60-63: $11,250 (total $35,750)
- Combined employee + employer limit: $72,000 ($80,000 with 50+ catch-up)
The pre-tax shield math
Every dollar you contribute to a traditional (pre-tax) 401(k) reduces your taxable income by $1 for federal and most state purposes. If your marginal federal rate is 24% and your state rate is 5%, a $1 contribution saves you $0.29 in current-year tax. That tax savings stays in your retirement account compounding until withdrawal.
At retirement you pay ordinary income tax on withdrawals. If your retirement marginal rate is lower than your current rate (common: $200k earner retires into a $100k income bracket), you arbitraged the difference. That's the traditional 401(k) play.
For a $10k raise at the 24% marginal bracket, diverting the full raise into traditional 401(k) means:
- Federal tax saved: $2,400
- State tax saved (CA example, 9.3%): $930
- FICA still paid (no shield): $765
- Current year take-home: +$865 (just the FICA-only net)
- Future retirement asset: +$10,000 plus decades of compounding
That's a useful frame: a 24% bracket person effectively pays about $7,000 in foregone take-home to accumulate $10,000 in pre-tax retirement wealth. A 2.3x leverage.
Roth vs traditional, the decision tree
Roth 401(k) contributions are made with after-tax dollars. No current tax benefit. But withdrawals in retirement are tax-free.
Rule of thumb:
- If your current marginal rate is higher than your expected retirement rate, lean traditional.
- If it's lower, lean Roth.
- If you can't predict (early career, uncertain retirement location), split 50/50.
Most people earning $60k to $150k are at 12 to 24% marginal federal. If you retire into $50k to $100k of income (typical middle-class retirement), you're at 12 to 22% marginal. That's pretty close, so the decision is often not obvious.
Two factors that push toward Roth: (1) you expect tax rates to rise generally, (2) you're at a low point in your career (e.g., first job out of college, grad school break) and will likely earn more later. Two factors that push toward traditional: (1) you're at a peak income year, (2) your state has high income tax now but you plan to retire somewhere cheaper.
The backdoor Roth and high earners
If your income is above the Roth IRA direct-contribution phase-out ($165k single, $246k MFJ for 2026), you can't contribute directly to Roth IRA. The "backdoor Roth" workaround (traditional IRA contribution, then convert to Roth) still works as of 2026 but is politically vulnerable. See your CPA. This doesn't affect 401(k) Roth contributions, which have no income cap.
Don't skip the match
If your employer matches 4% on 4%, contribute at least 4%. That's a 100% immediate return. Passing it up is leaving money on the table, full stop.
Before maxing, make sure you're capturing the full match. Some match formulas front-load (match all contributions in the first N months) and some stretch across the year. If yours front-loads, don't contribute too aggressively early or you'll hit the employee limit before year-end and miss some of the match. Fidelity has a decent explainer.
When not to max
Three scenarios where maxing is not the right move after a raise.
No emergency fund yet. If you don't have 3-6 months of expenses in cash, priority #1 is building that before maxing retirement. Retirement money is locked until 59.5 (with Rule of 55 and other exceptions); emergency money needs to be liquid.
High-interest debt. Credit card debt at 20%+, personal loans at 12%+, any debt that's costing you more in interest than your expected investment return. Pay it down first.
House fund in progress. If you're 12-24 months from a house purchase and need the down payment in cash, don't lock new savings into a 401(k). The Roth IRA allows first-time homebuyer withdrawals up to $10,000, but that's not much on a modern down payment.
Maxing the 401(k) is the right call for stable income, no high-interest debt, an emergency fund in place, and no near-term large cash need. Otherwise, capture the match and redirect the rest.
What maxing looks like across the income curve
$60k gross single, Texas, 3% raise (now $61.8k): maxing $24,500 means 39.6% of gross going to pre-tax retirement. Take-home drops severely. Unrealistic without a second income or no dependents.
$120k gross single, California, 4% raise (now $124.8k): maxing $24,500 is 20% of gross. Reduces taxable income to $100,300, federal tax delta of ~$5,400, state tax delta of ~$2,000. Effective out-of-pocket for the contribution: ~$17,100 to get $24,500 into retirement. Comfortable range.
$200k gross single, New York, 5% raise (now $210k): maxing $24,500 is 12% of gross. Federal tax delta ~$5,900, state tax delta ~$1,800. Effective out-of-pocket: ~$16,800. Easy call at this bracket.
Run your own numbers. The pay raise calculator doesn't model 401(k) directly (yet), but you can approximate by subtracting the contribution from the gross salary you enter. That shows you the post-contribution take-home.
The underrated: employer match on the raise
If your employer matches a percentage and you got a raise, the match dollar amount automatically goes up too. A 5% match on $100k = $5,000/year. On $110k = $5,500/year. That extra $500 is invisible on your paycheck but compounds alongside your own contributions.
Over a career, the forgotten-match-on-raises adds up. Capturing it requires nothing more than continuing to contribute enough to hit the full match percentage. Set your contribution as a % of salary, not a fixed dollar amount, and it scales automatically.
Takeaways
- Capture the full employer match always.
- After match, max traditional 401(k) if your marginal rate is above your expected retirement rate.
- Max Roth 401(k) if you're early in your career or expect higher rates later.
- Don't max if you have no emergency fund, high-interest debt, or an imminent house purchase.
- 2026 limits: $24,500 employee, $8,000 catch-up at 50+.
More on this in the main guide, and see bonus vs raise for the related comp-structure question. If you're unsure, a fee-only fiduciary CFP (hourly, not AUM) can validate your math for $500 to $1,500.