How Much Should You Save for Retirement at 40? Build Your Own Retirement Gap
You are 40.
You have money in your 401(k).
You are contributing every paycheck.
But is it actually enough?
A common retirement benchmark might tell you that you should have some multiple of your salary saved by age 40.
That can be useful as a quick reference.
But it cannot answer the question that matters most:
Are you currently on track to fund the retirement you actually want?
WalletBrief would calculate that instead.
Do not start with:
“How much should a 40-year-old have saved?”
Start with:
Current Retirement Balance
+ Future Contributions
+ Employer Match
+ Time
+ Investment Growth
=
Projected Retirement Assets
Then compare that with:
Desired Retirement Spending
− Estimated Social Security
=
Income Your Portfolio Must Support
That creates your:
RETIREMENT GAP
The Numbers
At age 40, time is still one of your most valuable retirement assets.
Someone retiring at 67 has approximately:
− Age 40
=
27 Years
to continue saving and investing
That means the balance you have today is only one part of the retirement equation.
Your future contributions, employer contributions, investment results and retirement date can materially change the outcome.
The 2026 401(k) Limit
For 2026, the IRS employee elective-deferral limit for 401(k), 403(b), most governmental 457 plans and the federal Thrift Savings Plan is $24,500.
The general catch-up contribution limit for participants age 50 and older is $8,000 in 2026, with different higher catch-up rules applying to certain participants ages 60 through 63.
But the legal contribution limit is not the same thing as your required retirement contribution.
You may need less.
You may need more retirement saving across multiple accounts.
The correct question is whether your current trajectory supports your future spending goal.
A 40-Year-Old Retirement Example
Consider this hypothetical worker:
| Input | Example |
|---|---|
| Current Age | 40 |
| Retirement Age | 67 |
| Current Retirement Balance | $150,000 |
| Employee Contributions | $15,000 / Year |
| Employer Contributions | $5,000 / Year |
| Total Annual Contributions | $20,000 |
| Illustrative Real Return | 4% |
For this illustration, we use a 4% annual return after inflation.
This is an assumption, not a forecast or guaranteed investment return.
Keeping the calculation in today's dollars allows us to compare future retirement assets with retirement spending expressed in today's purchasing power.
What Could That Grow To?
Under those simplified assumptions:
$150,000
+
$20,000 Annual Contributions
for 27 Years
at a hypothetical 4% real return
=
About $1.37 Million
in today's-dollar purchasing power
That number alone still does not tell us whether retirement is funded.
We need the other half of the equation:
How much money will retirement need to support?
Start With Retirement Spending — Not Salary
Suppose this household wants approximately $80,000 per year of retirement spending in today's dollars.
Now suppose the worker's personalized Social Security estimate indicates approximately $3,000 per month at the planned claiming age.
That would equal:
=
$36,000 / Year
The retirement portfolio would therefore need to support approximately:
$80,000
−
Estimated Social Security
$36,000
=
$44,000 / Year
Portfolio Income Needed
This is a simplified illustration. Taxes, healthcare, pensions, spouse benefits and other income sources may materially change the result.
Build the Retirement Target
To translate annual portfolio income into a planning target, we need another assumption.
For illustration, suppose the household uses a 4% initial withdrawal assumption.
Then:
÷ 4%
=
$1.10 Million
Illustrative Retirement Portfolio Target
This does not mean 4% is guaranteed to be sustainable for every retiree.
Withdrawal rates depend on investment returns, inflation, retirement length, portfolio composition, taxes and spending flexibility.
Here it is simply a planning assumption that you can change in the calculator.
Now We Can Calculate the Retirement Gap
Our example produces:
| Calculation | Amount |
|---|---|
| Projected Retirement Assets | About $1.37M |
| Illustrative Portfolio Target | About $1.10M |
| Projected Difference | About +$274K |
Under these assumptions, this hypothetical worker would not show a retirement funding gap.
But change only a few inputs and the answer can change dramatically.
What If Retirement Costs $100,000 a Year?
Keep everything else the same.
Desired spending becomes $100,000.
Estimated Social Security remains $36,000.
The portfolio now needs to support:
− $36,000
=
$64,000 / Year
Using the same illustrative 4% withdrawal assumption:
÷ 4%
=
$1.60 Million
The exact same 40-year-old who appeared ahead under an $80,000 spending target now has a projected shortfall.
That is why salary-multiple benchmarks cannot tell the whole story.
The Retirement Gap Calculator
Use your own numbers below.
For Social Security, use your personalized estimate from your Social Security Statement rather than a national average whenever possible.
Why Use a Real Return?
Retirement calculations can become confusing when future inflated dollars are compared with today's spending.
This calculator instead asks you to enter retirement spending in today's dollars and an assumed investment return after inflation.
That keeps both sides of the comparison closer to the same purchasing-power framework.
For example:
If you assume investments return 7% and inflation averages 3%, you might use approximately 4% as a simplified real-return assumption.
That is still only an assumption.
Actual investment returns and inflation will not move smoothly every year.
Run More Than One Return Scenario
Do not calculate retirement using only one optimistic investment return.
If the plan works only when investments produce unusually strong returns, the plan may have little room for disappointment.
Try several assumptions.
| Scenario | Illustrative Real Return |
|---|---|
| Lower-Growth Test | 2% |
| Middle Scenario | 4% |
| Higher-Growth Test | 6% |
These are scenario inputs, not predictions.
The purpose is to see how sensitive your retirement plan is to investment performance.
Employer Match Changes the Math
Do not calculate retirement using only the money coming out of your paycheck.
If your employer contributes to your retirement account, include those dollars in the projection.
For example:
$15,000
+
Employer Contribution
$5,000
=
$20,000 / Year
Total Retirement Funding
Over decades, ignoring employer contributions can materially understate the retirement trajectory.
Social Security Changes the Target
Social Security should not simply be ignored.
But WalletBrief would also not guess your benefit using a generic national average.
The Social Security Administration bases retirement benefits on your earnings record and the age at which you claim benefits.
Your personal Social Security account can provide estimates based on your earnings history.
Use that estimate in the calculator.
Retirement Age Changes Both Sides
Changing retirement age can affect the calculation in multiple ways.
Working longer can mean:
- More years of retirement contributions
- More years for existing assets to compound
- Fewer years that the portfolio must support retirement
- Potentially different Social Security benefits
SSA also explains that Social Security benefits are based in part on your highest 35 years of earnings and the age at which benefits begin.
So retirement age is not merely a date.
It is one of the largest variables in the plan.
What If You Are Behind at 40?
A projected retirement gap is not a verdict.
It is a planning number.
Suppose the calculator shows a $400,000 gap.
You now have several variables that can change it:
- Increase employee contributions
- Capture more available employer match
- Increase contributions when income rises
- Reduce expected retirement spending
- Retire later
- Change the Social Security claiming strategy
- Adjust investment allocation consistent with your risk capacity
The useful question becomes:
Which change closes the gap without making today's household finances unsustainable?
Do Not Destroy Today's Cash Flow to Fix Tomorrow
This matters particularly for someone around age 40.
You may simultaneously be paying for:
- A mortgage
- Children
- Childcare
- College savings
- Cars
- Insurance
- Aging parents
- Emergency savings
Retirement matters.
But so does keeping the current household financially stable.
Maximizing retirement contributions while repeatedly relying on credit cards for emergencies would not automatically represent a stronger financial position.
The Retirement Gap vs the Retirement Benchmark
| Benchmark Question | WalletBrief Question |
|---|---|
| How many times my salary have I saved? | What will my current assets become? |
| Am I above or below the average? | What retirement am I trying to fund? |
| What should someone my age have? | What income will my portfolio need to provide? |
| Am I behind? | What variable can I change? |
What the Numbers Actually Mean
Consider two 40-year-olds.
Person A has $250,000 saved but contributes only $5,000 per year and wants an expensive retirement at age 60.
Person B has $150,000 saved, contributes $20,000 per year including employer contributions, and plans to retire later with lower expected spending.
Person A has the larger balance today.
That does not automatically mean Person A has the stronger retirement trajectory.
Retirement planning is a moving equation.
Balance matters.
Contribution rate matters.
Time matters.
Future spending matters.
Social Security matters.
The relationship among those numbers matters more than any one of them alone.
WalletBrief's Take
I would not judge a 40-year-old's retirement plan from today's 401(k) balance alone.
A benchmark can tell you whether you look roughly ahead or behind compared with a rule of thumb.
It cannot tell you whether your actual retirement is funded.
I would calculate the trajectory instead.
Start with what you have.
Add what you are actually saving.
Include the employer contribution.
Give the money the years it has left to grow.
Then calculate the lifestyle that money eventually needs to support.
Include your personalized Social Security estimate.
The difference between those two sides is much more useful than being told you should have some arbitrary multiple of salary.
Your retirement balance is a snapshot.
Your Retirement Gap is the decision.
The Decision
Put these numbers on one page:
| Number | What It Tells You |
|---|---|
| Current Retirement Balance | Where you are today |
| Annual Employee Contribution | How aggressively you are funding retirement |
| Employer Contribution | Retirement funding not coming directly from your paycheck |
| Years Until Retirement | How much time remains for contributions and compounding |
| Desired Retirement Spending | The lifestyle your assets need to support |
| Estimated Social Security | Expected income that may reduce the amount required from your portfolio |
| Projected Retirement Assets | Where the current trajectory could lead under your assumptions |
| Retirement Gap | The difference you may need to close |
If the gap is large, test the variables one at a time.
Increase contributions.
Change retirement age.
Change retirement spending.
Test lower investment returns.
Use a different Social Security claiming assumption.
Then ask:
Which retirement plan works without destroying our Monthly Financial Margin today?
FAQ
How much should I have saved for retirement at 40?
Age-based benchmarks can provide context, but they cannot determine whether your individual retirement plan is funded. Current savings, future contributions, employer contributions, retirement age, expected spending, Social Security and investment performance all affect the result.
Is $150,000 in retirement savings enough at age 40?
The balance alone cannot answer that question. A $150,000 balance combined with decades of future contributions can produce a very different outcome from the same balance with little future saving or an early retirement target.
What is the 401(k) contribution limit in 2026?
The employee elective-deferral limit for most 401(k) plans is $24,500 in 2026. Separate catch-up and overall plan contribution limits may also apply.
Should I include my employer match in retirement projections?
Yes, if you reasonably expect the employer contribution to continue under the plan terms. Employer contributions increase the amount being added to the retirement account even though the money does not come directly from your paycheck.
Should I include Social Security in retirement planning?
Social Security can be included as an expected retirement-income source, but use a personalized SSA estimate when possible. Actual benefits depend on your earnings record and claiming age.
What investment return should I assume?
There is no guaranteed future return. Rather than relying on one optimistic assumption, test multiple scenarios and understand how lower returns change the retirement gap.
Is the 4% withdrawal rate guaranteed?
No. This article uses a user-adjustable withdrawal rate as a simplified planning assumption. Sustainable withdrawals depend on factors including market returns, inflation, retirement duration, asset allocation, taxes and spending flexibility.
What should I do if I am behind at 40?
Calculate the size of the projected gap first. Then test changes to contributions, employer match utilization, retirement age and expected retirement spending rather than reacting only to an age-based benchmark.
Bottom Line
“I am 40 and have $150,000.”
Calculate:
Current Retirement Assets
+ Future Contributions
+ Employer Match
+ Time
+ Investment Growth
=
Projected Retirement Assets
Then calculate:
Desired Retirement Spending
− Social Security
− Other Retirement Income
=
Income Needed From Portfolio
Convert that into a planning target.
Then compare:
Projected Assets
vs
Retirement Target
=
YOUR RETIREMENT GAP
Your balance tells you where you are.
Your trajectory tells you where you are going.
Sources
- Internal Revenue Service — 2026 Retirement Contribution Limits
- Internal Revenue Service — 401(k) Contribution Limits
- Social Security Administration — Get a Benefits Estimate
- Social Security Administration — Benefit Calculators
- Investor.gov — Compound Interest Calculator
WalletBrief provides general educational information and simplified planning calculations, not individualized investment, tax, Social Security or financial advice. Investment returns, inflation, taxes, Social Security benefits, retirement spending and longevity are uncertain and will vary.
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