How Much Should I Put in My 401k Each Month?
If you have a 401k at work and you're not sure how much to contribute each month, you're not alone. It's one of the most common money questions people have — and the answer depends on your income, age, and retirement goals.
The good news is there are some simple rules and real numbers that can help you figure out the right amount for your situation. Let's break it all down.
What Is a 401k, Quickly?
A 401k is a retirement savings account offered by your employer. You contribute a portion of your paycheck before taxes, it grows over time, and you use it when you retire. Many employers also match a portion of what you put in — which is essentially free money added to your account.
💡 Key Point: If your employer offers a 401k match, always contribute at least enough to get the full match. Not doing so is leaving free money on the table.
The Simple Rule: Start With 15%
Most financial experts suggest saving 10% to 15% of your gross (pre-tax) income for retirement each month. A common starting target is 15%, which includes any employer match.
Here's how that looks at different income levels:
| Annual Salary | Monthly Gross Income | 15% Monthly Contribution |
|---|---|---|
| $40,000 | $3,333 | $500/month |
| $60,000 | $5,000 | $750/month |
| $80,000 | $6,667 | $1,000/month |
| $100,000 | $8,333 | $1,250/month |
| $120,000 | $10,000 | $1,500/month |
If 15% feels like too much right now, that's okay. Start with whatever you can — even 5% or 6% — and increase it by 1% every year. Small, consistent increases add up to a big difference over time.
The 2026 401k Contribution Limits
The IRS sets a limit on how much you can contribute to your 401k each year. For 2026, the limits are:
| Who | 2026 Annual Limit | Monthly Equivalent |
|---|---|---|
| Under age 50 | $23,500 | ~$1,958/month |
| Age 50 and older (catch-up) | $31,000 | ~$2,583/month |
Most people don't hit the maximum limit — and that's perfectly fine. The goal is to contribute consistently, not necessarily to max out every year (unless you can afford to and are behind on savings).
How Employer Match Changes Your Target
If your employer matches your contributions, your personal contribution target can be lower — because their match counts toward your 15% goal.
Common employer match example:
- Employer matches 50% of your contributions up to 6% of your salary
- If you earn $60,000/year and contribute 6%, your employer adds 3%
- That's a combined 9% total going into your 401k
- You only need to contribute 6% yourself to get the full match
✅ Step 1 Rule: Always contribute enough to get your full employer match first. Then, if you can, work toward 15% total (your contribution + employer match combined).
How Much Should You Have in Your 401k by Age?
Here's a simple guideline to check if you're on track for retirement. These are based on saving enough to retire comfortably at age 67:
| Your Age | Suggested 401k Balance |
|---|---|
| By age 30 | 1× your annual salary |
| By age 40 | 3× your annual salary |
| By age 50 | 6× your annual salary |
| By age 60 | 8× your annual salary |
| By age 67 | 10× your annual salary |
So if you earn $70,000 and you're turning 40, you'd want around $210,000 saved in your 401k by that point. Behind on this? Don't panic — just increase your monthly contribution now and let compound growth do the heavy lifting.
What Happens If You Start Late?
Starting late is better than never starting. Here's a real example showing the power of starting as early as possible:
| Person A (starts at 25) | Person B (starts at 35) | |
|---|---|---|
| Monthly contribution | $400 | $400 |
| Annual return (assumed) | 7% | 7% |
| Balance at age 65 | ~$998,000 | ~$486,000 |
| Total contributed | $192,000 | $144,000 |
Person A contributed just $48,000 more — but ended up with over $500,000 more at retirement. That's the power of starting early and letting compound interest work for you.
⚠️ If you're behind: If you're 50 or older, take advantage of the IRS catch-up contribution. You can contribute an extra $7,500 per year above the standard limit in 2026, giving you more time to boost your savings before retirement.
A Simple Monthly 401k Contribution Plan
Not sure where to start? Use this simple 3-step approach:
- Step 1: Find out if your employer offers a match and what percentage they match
- Step 2: Contribute at least enough to get the full employer match (usually 3–6% of your salary)
- Step 3: Gradually increase your contribution by 1% each year until you reach 15% total
Your Monthly Contribution = (Your Annual Salary × Target %) ÷ 12
Example: $60,000 × 10% ÷ 12 = $500/month
Final Thoughts
There's no single "perfect" number for everyone — but a solid target is to contribute at least enough to get your full employer match, and work toward 15% of your gross income over time.
If you can only afford 5% right now, that's a great start. Increase it slowly, stay consistent, and let time do the work. The most important thing is to begin — because every month you wait is a month of compound growth you can never get back.
Use a 401k calculator to plug in your exact income, current balance, and contribution rate to see what your retirement could look like. Seeing the actual numbers is one of the best motivators to save more.