Retirement Calculator with Pension and Social Security

Begin by entering your personal timeline in the "Savings & Contributions" section. Your current age and planned retirement age determine how many years you have left to save. Your life expectancy sets the duration for which your retirement income will be needed.

Next, input your financial details. Provide your current retirement savings balance and how much you contribute monthly. Add an estimated annual return on your investments. This section projects how your personal savings will grow until you retire. For a more detailed look at savings, use our retirement savings calculator.

Then, move to the "Pension Details" section. Enter your expected monthly pension benefit, the age you'll start receiving it, and any annual Cost-of-Living Adjustment (COLA) your pension plan offers. The survivor benefit percentage is important for spousal planning, as it determines what a surviving spouse would receive.

After that, fill in the "Social Security" section. Input your estimated monthly benefit and the age you plan to claim. You can find this information on your official Social Security statement. Include an estimated COLA to account for future inflation adjustments. To explore different claiming strategies, use the Social Security break-even calculator.

Finally, outline your "Retirement Expenses." Enter your expected annual spending in today's dollars, a long-term inflation rate, and your life expectancy. These inputs define your financial need in retirement. For help estimating costs, see our guide on how to create a retirement budget step-by-step. For more advanced planning, you can also set an effective tax rate on your retirement income.

Savings & Contributions

This section covers your personal investment portfolio.

• Current Age & Retirement Age: These dates define your accumulation phase—the time you have to build your nest egg. A longer timeline provides more opportunity for your investments to compound.
• Current Savings: This is the total value of your retirement investment accounts, such as your 401(k), IRA, Roth IRA, and taxable brokerage accounts.
• Monthly Contribution: The amount you consistently save for retirement each month. This is a powerful driver of your final savings balance. Not sure how much to save? See our guide on how much you should save for retirement each month.
• Annual Return: Your estimated average annual growth rate for your investments. This should be a realistic, long-term average. Younger investors might use a higher rate, while those near retirement may use a more conservative one.

Pension Details

This section focuses on your defined benefit pension plan.

• Monthly Pension Benefit: The fixed monthly payment you expect to receive from your employer's pension plan in retirement. You can usually find this on your annual pension statement.
• Pension Start Age: The age at which you will begin receiving pension payments. This may or may not be the same as your retirement age.
• Pension COLA: The annual Cost-of-Living Adjustment applied to your pension payments. A COLA helps your pension income keep pace with inflation. Not all pensions offer a COLA, so check your plan documents.
• Survivor Benefit: The percentage of your pension that will continue to be paid to your spouse after your death. Choosing a survivor benefit typically reduces your monthly payment while you are both alive.

Social Security

This section models your benefits from the Social Security Administration.

• Monthly SS Benefit: Your estimated monthly Social Security payment. The most accurate number comes from your statement at SSA.gov. To learn how this is calculated, see how much will I get from Social Security.
• SS Start Age: The age you plan to start collecting Social Security. You can claim as early as 62 or delay as late as 70. Your claiming age significantly impacts your monthly benefit amount. See a comparison in when to take Social Security: 62 vs 67 vs 70.
• Estimated COLA: The projected annual cost-of-living adjustment for Social Security. This helps your benefit maintain its purchasing power over time. For more on this, read about the Social Security COLA explained.

Retirement Expenses

Here, you define your spending needs in retirement.

• Annual Expenses: Your estimated total spending for one year of retirement, expressed in today's dollars. This is a critical input that determines how much income you'll need. The retirement expense calculator can help you detail this.
• Inflation Rate: The long-term average rate at which you expect the cost of goods and services to rise. This is used to project your future expenses accurately.
• Life Expectancy: A planning assumption for how long your retirement will last. It's often wise to plan for a longer-than-average lifespan to reduce the risk of outliving your money.

Effective Tax Rate (Advanced)

This is your estimated average tax rate on all your retirement income, including pension payments, Social Security benefits, and withdrawals from pre-tax savings accounts. Taxes can significantly reduce your spendable income. For more information, see our articles on how 401(k) withdrawals are taxed and the best states to retire for taxes.

This calculator uses a two-stage projection model.

1. Accumulation Phase (Pre-Retirement): First, it calculates the future value of your current savings at your planned retirement age. It does this by starting with your current savings and simulating growth year by year. In each year before retirement, it adds your total annual contributions (monthly contribution x 12) and then applies your estimated annual investment return.

2. Distribution Phase (Post-Retirement): Once you retire, the calculator switches to a detailed, year-by-year cash flow simulation that lasts until your specified life expectancy. In each year of retirement, it performs the following steps:

• Calculates Expenses: It takes your initial annual expense target and increases it based on the cumulative effect of the inflation rate.
• Calculates Guaranteed Income: It determines your annual income from your pension and Social Security. These amounts are adjusted each year based on their respective COLA settings and only begin at their specified start ages.
• Calculates After-Tax Income: It applies your effective tax rate to your pension and Social Security income to estimate your after-tax cash flow from these sources.
• Determines the Shortfall: It compares your after-tax guaranteed income to your annual expenses. If your income is less than your expenses, the difference is the shortfall that must be covered by your savings.
• Models Withdrawals: The calculator withdraws the shortfall amount from your retirement savings balance.
• Applies Investment Growth: The remaining balance in your savings portfolio grows by the annual return rate.
• Repeats Annually: This process repeats for every year of your retirement, tracking your savings balance over time.

The final score is a blend of how well your guaranteed income covers expenses, whether your savings are sufficient to cover all shortfalls, and how many years you experience an income gap.

The calculator uses a year-by-year simulation rather than a single formula. Here are the core calculations used in the model.

Savings at Retirement (Accumulation)

This is calculated iteratively for each year before retirement:

Next Year's Savings = (Current Savings + Annual Contributions) * (1 + Annual Return Rate)

Where Annual Contributions is Monthly Contribution * 12.

Annual Calculations in Retirement (Distribution)

For each year y from retirement age to life expectancy:

Current Year Expenses = Annual Expenses * (1 + Inflation Rate) ^ (y)

Annual Pension = (Monthly Pension * 12) * (1 + Pension COLA) ^ (years since pension start)

Annual Social Security = (Monthly SS * 12) * (1 + SS COLA) ^ (years since SS start)

After-Tax Guaranteed Income = (Annual Pension + Annual Social Security) * (1 - Effective Tax Rate)

Income Shortfall = max(0, Current Year Expenses - After-Tax Guaranteed Income)

Withdrawal = min(Income Shortfall, Current Savings Balance)

End-of-Year Savings = (Current Savings Balance - Withdrawal) * (1 + Annual Return Rate)

Successful retirement planning often relies on what is known as the "three-legged stool" or the three pillars of retirement income: Social Security, employer-sponsored plans (like pensions and 401(k)s), and personal savings (like IRAs and brokerage accounts). This calculator is specifically designed to model how these three pillars work together.

1. Social Security: This forms the base layer of income for most American retirees. It's an inflation-adjusted stream of income guaranteed for life. However, for most people, it's not enough to live on alone. See our article on if you can live on Social Security alone.

2. Pensions: A defined benefit pension is a powerful retirement asset, providing a predictable, monthly check. Unlike a 401(k), the employer bears the investment risk. The combination of a pension and Social Security can create a very stable income floor, covering essential expenses like housing, food, and healthcare.

3. Personal Savings: This is the flexible component. Your 401(k), IRAs, and other investments are used to fill the gap between your guaranteed income and your total spending needs. This is the capital you use for discretionary spending, travel, unexpected costs, and legacy goals.

A strong plan integrates all three. By using this calculator, you can see exactly how much of your spending is covered by guaranteed sources and how much of a burden falls on your personal savings. A plan where pension and Social Security cover 80-100% of essential expenses is generally considered very robust.

Inflation is one of the biggest silent risks in retirement. An income that feels comfortable at age 65 may feel tight at age 85. This is where Cost-of-Living Adjustments (COLAs) become critical.

Social Security benefits are adjusted for inflation annually. This is a major advantage that helps maintain your purchasing power over a long retirement. You can learn more about how this works in our guide to the Social Security COLA.

Pensions are different. Some government pensions (like FERS) have strong COLAs, while many private-sector pensions have small COLAs or none at all. A pension without a COLA is a declining stream of income in real, inflation-adjusted terms.

When using the calculator, pay close attention to the COLA inputs. If your pension has no COLA, enter 0%. The projection will show its purchasing power eroding over time compared to your rising expenses. This highlights why having other inflation-protected income or a larger savings portfolio is crucial for long-term security.

• Retirement Score: This gives you a quick snapshot of your plan's viability. A high score (80+) suggests your income sources are well-matched to your expenses. A lower score indicates potential shortfalls that require attention.
• Summary Cards: These cards provide key lifetime totals, including your after-tax income from pension and Social Security, the total amount you'll need to withdraw from savings, and your projected final balance at life expectancy.
• Income Sources vs Expenses Chart: This is the core visual of your plan. It stacks your income sources (pension, Social Security, and savings withdrawals) against your rising expenses. An ideal chart shows the guaranteed income (pension and SS) covering a large portion of the red "Expenses" line, with savings withdrawals filling the remaining gap.
• Lifetime Income Breakdown Chart: This donut chart shows what percentage of your total retirement income comes from each of the three pillars. It's a powerful way to see how reliant you are on each source.
• Insights Panel: This section provides automated, plain-language feedback on your plan. It will point out strengths (like high guaranteed income coverage) and weaknesses (like a large gap before Social Security starts or savings running out too early).

If your score is lower than you'd like, you have several levers to pull.

1. Increase Savings: Boosting your monthly contribution is the most direct way to improve your outcome. Even small increases can make a big difference over time.
2. Delay Retirement: Working a few years longer gives your savings more time to grow and shortens the number of years you need to draw them down. Use the retirement age calculator to model this effect.
3. Optimize Claiming Ages: Delaying your Social Security benefits to age 70 can dramatically increase your monthly payment for life. Similarly, some pension plans offer higher payouts if you start them later.
4. Review Expenses: A small reduction in your planned annual spending can have a huge impact on how long your money lasts. Revisit your retirement budget to find potential savings.
5. Consider a Pension Buyout (Carefully): If your pension has no COLA, you might consider taking a lump-sum buyout and investing it yourself. This is a complex decision with significant risks. Use the pension buyout calculator to analyze the numbers.

• Ignoring Inflation: Assuming a fixed pension payment will be sufficient for 30 years is a major error if it has no COLA. Your expenses will rise, but your income won't.
• Forgetting Taxes: Pension income, most Social Security benefits, and traditional 401(k)/IRA withdrawals are taxable. Your plan must account for a lower after-tax income.
• Misunderstanding Survivor Benefits: Failing to elect a survivor benefit can leave a non-pensioned spouse with a sudden, dramatic loss of income. Understand your options before you retire.
• Ignoring the "Gap Years": Many people retire at 62 but don't start Social Security until 67. The calculator will show how your savings must cover 100% of your expenses during these critical gap years.