How Much Should I Invest Each Month? (A Simple Formula)
Aim for 15% of gross pay including your employer match. See how much to invest each month at your salary, the order your dollars go in, and the 2026 limits.
Most people your age should invest about 15% of gross pay each month, counting whatever your employer puts in. On a $90,000 salary that is roughly $1,125 a month total, and if your employer contributes 3% of pay, about $900 of it comes out of your own paycheck.
Quick Answer: Invest 15% of your gross income each month, including your employer match. At $60,000 that is $750 a month, at $90,000 it is $1,125, and at $120,000 it is $1,500. Capture the full match first, keep a starter emergency fund, then fill an IRA before pushing your 401(k) higher.
Why 15% of Gross Pay Is the Right Starting Number
Fifteen percent works because it is the rate that lets a normal career fund a normal retirement without heroics. Start at 25 and invest 15% of a rising salary, and you land somewhere near 10 to 12 times your final income by your mid-sixties, which is roughly what it takes to replace your paycheck.
Use gross pay, not take-home. Your 401(k) contributions come out before tax anyway, so measuring against gross is the only way the math stays consistent when your withholding changes. And count the employer contribution: that money buys the same shares yours does.
For those of us who came to this late, the number moves. Starting at 32 instead of 25 pushes the target closer to 18% or 20%. That sounds brutal until you notice it is usually one raise away. If you have been getting raises and not feeling richer, that is the gap this fixes: the money your raises quietly absorbed is the same money this plan needs.
What 15% Looks Like at Your Salary
Here is the whole thing in dollars, assuming your employer puts in 3% of pay. The last column is what actually leaves your paycheck each month.
| Gross salary | 15% target per month | Employer 3% per month | Your share per month |
|---|---|---|---|
| $60,000 | $750 | $150 | $600 |
| $75,000 | $938 | $188 | $750 |
| $90,000 | $1,125 | $225 | $900 |
| $110,000 | $1,375 | $275 | $1,100 |
| $130,000 | $1,625 | $325 | $1,300 |
If your match is richer than 3%, your own share drops. If your employer offers nothing, the full 15% is on you. Check your plan document rather than guessing, because match formulas vary widely and a lot of people underestimate theirs by half.
The Order Your Dollars Should Go In
The order matters more than the total, because the first few hundred dollars a month are worth far more than the last few hundred. Work down this list and stop wherever your money runs out.
- 1. The full employer match. Say your plan matches 50 cents on the dollar up to 6% of pay. On $90,000, contributing $450 a month gets you $225 a month free. Nothing else you do this year returns 50% on day one.
- 2. A starter emergency fund. One month of expenses in cash, so a car repair does not become a 401(k) loan. The CFPB has a practical guide to building one, and we cover how much emergency fund you actually need separately.
- 3. Debt above roughly 7%. Paying off a 22% credit card is a guaranteed 22% return. Student loans at 5% usually are not worth prioritizing over investing, which is the whole argument in paying off student loans versus investing.
- 4. An IRA, up to $7,500 for 2026. That is $625 a month. You pick the provider and the funds, which usually means lower fees and better options than a workplace menu.
- 5. Back to the 401(k) until you hit 15%, then keep going if you have room.
How Much Can You Legally Invest Each Month in 2026?
The ceiling is higher than most people will reach. For 2026 the IRS set the 401(k), 403(b), 457 and TSP employee contribution limit at $24,500, and the IRA limit at $7,500. Divided by twelve, that is $2,041.67 and $625 a month.
Maxing both means investing $2,666.67 every month, or $32,000 a year. On a $90,000 salary that is 35.6% of gross pay, which is not a realistic target for someone paying rent in a city. Treat the limits as a ceiling you may reach in your late thirties, not a scorecard you are failing today.
One more limit worth knowing: Roth IRA eligibility phases out between $153,000 and $168,000 of income for single filers in 2026, and between $242,000 and $252,000 for married couples filing jointly. If you are near that range, the account you choose changes, and how Roth and traditional IRAs compare in your 30s covers which one to fund. For the full account map, see tax-advantaged accounts and what each one is for.
What If 15% Is Not Realistic Right Now?
Then invest less and automate it anyway. A 5% contribution on $90,000 is $375 a month, and left alone for 30 years at a 7% average return that is about $457,000. Not the plan you wanted, but not nothing, and vastly better than waiting until the number feels impressive.
The move that actually closes the gap is not cutting harder, it is escalating on raises. Bump your contribution rate one percentage point every time your pay goes up. You never feel the drop, because the money was never in your checking account, and many 401(k) plans will do it automatically if you turn on auto-escalation.
If you genuinely cannot find the money, the problem is upstream of investing and belongs in your spending plan first. Building a budget that survives contact with real life is the prerequisite, and it usually surfaces 3% to 5% of income nobody was tracking.
What a Monthly Number Actually Buys You
Run the numbers once and the abstraction disappears. At a 7% average annual return, here is what a fixed monthly contribution grows into. You can check any of these yourself with the SEC's compound interest calculator.
| Invested monthly | After 20 years | After 25 years | After 30 years |
|---|---|---|---|
| $375 | $195,000 | $304,000 | $457,000 |
| $625 | $326,000 | $506,000 | $762,000 |
| $900 | $469,000 | $729,000 | $1,098,000 |
| $1,125 | $586,000 | $911,000 | $1,372,000 |
Two things jump out of that table. First, $900 a month for 30 years crosses a million dollars, which is why the 15% figure on a normal salary is not a fantasy. Second, the gap between the 25-year and 30-year columns on that same $900 is about $369,000. Five years of delay costs more than a third of the outcome, and no amount of clever fund selection makes that back.
Where the Money Goes Once You Pick a Number
Decide the amount first, then the funds, because the amount does more work. A total US stock index fund or a target date fund matched to your retirement year will both do the job, and the choice between them is mostly about whether you want to rebalance yourself. We compare them in index funds versus target date funds.
Then set it and stop touching it. Automatic contributions on payday, one fund or two, and an annual check to confirm the rate still matches your income. At Planned, that annual check is the part we care most about, because a contribution rate set at $65,000 and never revisited is the single most common reason a plan quietly stops working. If you want a second opinion on whether your number is right for your situation, that is exactly the conversation to have with a CFP® professional.
When to Change Your Monthly Number
Revisit the number when your income changes by more than about 10%, when a goal arrives that needs cash within five years, or once a year regardless. A raise from $90,000 to $105,000 moves your 15% target from $1,125 to $1,313 a month, and an extra $50 a month invested for 30 years is roughly $61,000 at the end.
Do not raise it for a good market or cut it for a bad one. The contribution rate is the lever you control, and changing it based on headlines is how people end up buying less when things are cheap. If you want a benchmark to sanity-check yourself against, what a healthy savings rate looks like at 28 gives you the milestones by age.
Frequently Asked Questions
Should I invest monthly or wait and put in a lump sum?
Invest monthly. Historically a lump sum invested immediately beats spreading it out about two thirds of the time, simply because markets rise more often than they fall. But that only applies to money you already have. For income arriving every two weeks, monthly contributions are not a strategy choice, they are just how the money shows up.
How much should I invest each month if I am self-employed?
Same 15% target, different accounts. A solo 401(k) lets you contribute as both employee and employer, so the total room is far larger than a workplace plan. Because 1099 income swings, set your monthly amount off your lowest realistic month and add a lump sum at year end once you know what you actually earned.
Should I keep investing when the market is at an all-time high?
Yes. Markets spend a large share of their time near highs, because that is what long-term growth looks like from the inside. Waiting for a dip means guessing twice, once on the way out and once on the way back in. Your monthly contribution buys fewer shares at highs and more at lows automatically.
How much should I invest in my 20s compared with my 30s?
The percentage stays similar, but the dollars and the urgency differ. In your 20s, 10% to 15% is plenty because you have 40 years of compounding ahead. Start in your 30s and 18% to 20% is closer to the mark, since you have lost roughly a decade of the growth that does most of the work.
The Takeaway
Pick a percentage, turn it into a dollar amount your payroll system can execute on Friday, and let the order of operations decide where those dollars land. Fifteen percent of gross pay including the match is the target, the exact number matters less than automating it, and the best month to start is whichever one you are in.
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