401k Calculator 2026 — 401k Contribution Calculator, Compound Interest & Retirement Projection
Free 401k calculator for 2026 with updated IRS contribution limits, employer match modeling, and year-by-year compound growth projections. Calculate how much your 401k will be worth at retirement, how much you save in taxes this year, and whether traditional or Roth 401k is better for your situation. Includes 2026 SECURE 2.0 super catch-up contribution for ages 60–63.
401k Contribution Limits 2026 — IRS Notice 2025-67
The IRS increased 401k contribution limits for 2026. The employee elective deferral limit rises from $23,500 (2025) to $24,500 (2026). The SECURE 2.0 Act super catch-up for workers aged 60 to 63 remains at $11,250, providing a total of $35,750 for this age group.
| Limit type | Who it applies to | 2026 limit | 2025 limit | Change |
|---|---|---|---|---|
| Employee elective deferral | All workers under age 50 | $24,500 | $23,500 | +$1,000 |
| Catch-up contribution | Age 50–59 and age 64+ | $8,000 | $7,500 | +$500 |
| Total with standard catch-up | Age 50–59 and 64+ | $32,500 | $31,000 | +$1,500 |
| SECURE 2.0 super catch-up | Age 60, 61, 62, 63 only | $11,250 | $11,250 | No change |
| Total with super catch-up | Age 60–63 | $35,750 | $34,750 | +$1,000 |
| Combined employer + employee limit | Under age 50 | $72,000 | $70,000 | +$2,000 |
| Combined limit with catch-up | Age 50–59 and 64+ | $80,000 | $77,500 | +$2,500 |
| Compensation cap for match | All workers | $360,000 | $350,000 | +$10,000 |
Source: IRS Notice 2025-67. SECURE 2.0 Act Section 109 (age 60–63 super catch-up). IRC Section 401(a)(17) compensation cap. IRC Section 415 combined additions limit.
How 401k Employer Match Works — The Free Money You Cannot Afford to Miss
An employer match is additional money your company contributes to your 401k based on how much you contribute. It is the highest guaranteed return available to any investor — an immediate 50% to 100% return before your money grows a single dollar. Not capturing the full match is the single most expensive retirement planning mistake most workers make.
Employer match example — 50% match on first 6% of salary, $70,000 salary
| Match formula | Required contribution | $60K salary | $80K salary | $100K salary |
|---|---|---|---|---|
| 50% of first 6% | 6% of salary | $1,800/yr | $2,400/yr | $3,000/yr |
| 100% of first 3% | 3% of salary | $1,800/yr | $2,400/yr | $3,000/yr |
| 100% of first 4% | 4% of salary | $2,400/yr | $3,200/yr | $4,000/yr |
| 100% of first 6% | 6% of salary | $3,600/yr | $4,800/yr | $6,000/yr |
| No employer match | N/A | $0 | $0 | $0 |
401k Tax Savings 2026 — How Much You Save This Year
Traditional 401k contributions reduce your federal taxable income dollar for dollar, generating an immediate tax saving this year. The saving depends on your marginal tax bracket. FICA taxes are not reduced by 401k contributions — only income tax is affected.
| Annual 401k contribution | 12% bracket savings | 22% bracket savings | 24% bracket savings | 32% bracket savings |
|---|---|---|---|---|
| $3,000 | $360 | $660 | $720 | $960 |
| $6,000 | $720 | $1,320 | $1,440 | $1,920 |
| $10,000 | $1,200 | $2,200 | $2,400 | $3,200 |
| $15,000 | $1,800 | $3,300 | $3,600 | $4,800 |
| $24,500 (full limit under 50) | $2,940 | $5,390 | $5,880 | $7,840 |
| $32,500 (age 50+ catch-up) | $3,900 | $7,150 | $7,800 | $10,400 |
| $35,750 (age 60–63 super catch-up) | $4,290 | $7,865 | $8,580 | $11,440 |
Federal income tax savings only. State income tax savings are additional (0% to 13.3% of contribution depending on state). FICA (Social Security + Medicare) is not reduced by 401k contributions — it is calculated on gross wages. Roth 401k contributions do not produce these income tax savings.
Roth 401k vs Traditional — Which Is Better in 2026?
The traditional vs Roth 401k decision is essentially a bet on your future tax rate vs your current tax rate. If taxes will be higher in retirement, Roth wins. If taxes will be lower in retirement, traditional wins. For most middle-income workers, the answer is not obvious — and a mix of both may be optimal.
Traditional 401k
Roth 401k
Traditional vs Roth — $10,000 contribution, 22% bracket now, 25 years to retirement at 7% growth
For most workers aged 25–40 currently in the 22% bracket, a mix of traditional (for immediate tax savings) and Roth (for tax diversification in retirement) is optimal. Workers early in their career in the 10–12% bracket almost always benefit from Roth — the low current rate is unlikely to be lower in retirement.
401k Early Withdrawal Penalty — The Real Cost Before Age 59.5
Withdrawing from a traditional 401k before age 59.5 triggers two costs — the immediate 10% penalty plus ordinary income tax on the full amount. But the true cost is much larger when you account for the lost compound growth on the withdrawn amount over the remaining years to retirement.
| Age at withdrawal | Withdrawal amount | 10% penalty | Income tax (22%) | You receive | Lost growth to age 65 |
|---|---|---|---|---|---|
| 35 | $20,000 | $2,000 | $4,400 | $13,600 | $184,280 |
| 40 | $20,000 | $2,000 | $4,400 | $13,600 | $131,175 |
| 45 | $20,000 | $2,000 | $4,400 | $13,600 | $93,430 |
| 50 | $20,000 | $2,000 | $4,400 | $13,600 | $66,533 |
| 35 | $50,000 | $5,000 | $11,000 | $34,000 | $460,700 |
Lost growth calculated as withdrawn amount growing at 7% annually from withdrawal age to 65. Assumes no reinvestment of the after-tax proceeds. Income tax rate varies by total income — 22% shown as illustration. State tax would add 0% to 13.3% additional. The 10% penalty does not apply after age 59.5 or under specific hardship exceptions.
401k Calculator — Frequently Asked Questions
What is the 401k contribution limit for 2026?
The 2026 401k employee elective deferral limit is $24,500 for workers under age 50 per IRS Notice 2025-67. Workers aged 50–59 and 64+ can contribute $32,500 ($24,500 + $8,000 catch-up). Workers aged 60–63 receive the SECURE 2.0 super catch-up of $11,250, allowing $35,750 total. The combined employer plus employee limit is $72,000 (under 50). These limits increased from $23,500 in 2025. Employer contributions never count against your personal elective deferral limit — they count only against the combined $72,000 IRC Section 415 limit.
How much to contribute to 401k in 2026 — what is the right amount?
Step 1: Contribute at least enough to capture the full employer match — this is free money with an immediate 50–100% return. Step 2: Max out an HSA if eligible ($4,300 single, $8,550 family) — it has better tax treatment than a 401k. Step 3: If you can save more, increase 401k contribution toward the $24,500 limit. Step 4: Consider a Roth IRA ($7,000 limit) for tax diversification. The 15% of income rule (including employer match) is a common guideline for workers starting in their 20s. Workers starting later need higher percentages — a 40-year-old needs to save approximately 20–25% to catch up.
How does a 401k employer match work?
An employer match adds free money to your 401k based on your own contribution. The most common formula is 50% of employee contributions up to 6% of salary. If your salary is $70,000 and you contribute 6% ($4,200), your employer adds $2,100 — a 50% instant return on your $4,200 before any investment growth. Always contribute at least enough to get the full match. On a $70,000 salary with a 50%-of-6% match, contributing 5% instead of 6% costs you $700 per year in free employer money — which compounds to approximately $66,000 over 30 years at 7% growth.
What is the difference between traditional and Roth 401k?
Traditional 401k: contributions are pre-tax (reduce taxable income now), growth is tax-deferred, withdrawals are taxed as ordinary income in retirement. Roth 401k: contributions are after-tax (no immediate tax saving), growth is tax-free, qualified withdrawals in retirement are 100% tax-free including all growth. Both have the same $24,500 contribution limit in 2026. Traditional wins if your current tax rate is higher than your retirement rate. Roth wins if your current rate is lower. Workers in the 10–12% bracket now should almost always use Roth. Workers in the 32%+ bracket often prefer traditional for the immediate tax saving.
Does a 401k contribution reduce my paycheck?
Yes — but by less than the contribution amount. A traditional 401k contribution reduces your take-home pay by the contribution minus the federal (and state) income tax you no longer owe. A $200 biweekly 401k contribution in the 22% bracket reduces your take-home by approximately $156 — not $200 — because you save $44 in federal tax. FICA (Social Security + Medicare 7.65%) is still owed on the full gross wages. Use our paycheck calculator to see the exact impact of a 401k contribution on your specific paycheck.
What is the 401k early withdrawal penalty?
Early withdrawal (before age 59.5) from a traditional 401k triggers a 10% penalty plus ordinary income tax on the entire amount. A $20,000 withdrawal in the 22% bracket costs $2,000 penalty + $4,400 income tax — you receive only $13,600. The real cost is much higher when you factor in lost compound growth. That $20,000 growing at 7% for 30 years becomes $152,245. You are not just losing $6,400 — you are losing $138,645 in future wealth. Exceptions to the 10% penalty include age 55 separation from service, disability, 72(t) SEPP distributions, and specific hardship provisions.
What is the SECURE 2.0 catch-up contribution for 2026?
Workers aged exactly 60, 61, 62, or 63 can make a super catch-up contribution of $11,250 above the base $24,500 limit in 2026 — for a total of $35,750. This is $3,250 more than the standard $8,000 catch-up available to workers aged 50–59 and 64+. At age 64, the catch-up drops back to $8,000. The 4-year super catch-up window under SECURE 2.0 Section 109 is designed to help workers in the pre-retirement acceleration phase maximize tax-advantaged savings. Workers in this window should update their 401k election to maximize this limited-time opportunity.
How much will my 401k be worth — 401k compound interest explained?
Your 401k balance at retirement depends on starting balance, annual contributions, employer match, return rate, and years invested. At 7% average annual return: a 25-year-old contributing $10,000/year with $3,000 employer match for 40 years reaches approximately $2.1 million. The same person starting at 35 reaches approximately $1.1 million — 10 extra years of compounding is worth $1 million. Time in the market is the single most powerful variable. Use the calculator on this page to project your specific balance. For paycheck impact of contribution changes, see our paycheck calculator.
Can I contribute to both a 401k and an IRA in 2026?
Yes. Having a 401k at work does not prevent you from contributing to an IRA. You can contribute up to $7,000 to a Roth or traditional IRA in 2026 ($8,000 if age 50+) in addition to your 401k contributions. For a Roth IRA, eligibility phases out at $150,000 MAGI for single filers and $236,000 for MFJ. For a traditional IRA, contributions are always allowed but the tax deductibility phases out if you have a workplace plan and earn above $79,000 (single) or $126,000 (MFJ) in 2026. Contributing to both a 401k and Roth IRA is the gold standard retirement savings strategy for most workers.