Calculating Your Retirement Number in 3 Steps

Retirement planning does not have to be a mystery.

Published: 9/2/2025, 9:50:57 AM EDT

Calculating Your Retirement Number in 3 Steps — (beeboys/Shutterstock)

Planning for retirement can seem challenging. Many ask, “How much money do I need to retire?” As a certified financial planner, I began exploring this question and found that a clear, simple method can help anyone understand their retirement needs. In this article, I share a process that breaks down the calculation into three straightforward steps.

Understanding Retirement Expenses

When planning for retirement, it helps to know the average annual expenses. According to data from the Bureau of Labor Statistics, most retirees spend about $60,000 each year. This average provides a starting point for planning. It represents a benchmark for many Americans as they prepare for the next phase of their lives.

My approach is simple. I compare current Social Security benefits with the estimated annual needs and calculate the extra income required. This method provides a clear picture of the funds required in a retirement portfolio.

Step 1: Assessing Your Social Security Claims

The first step involves checking your yearly Social Security income. To start, simply log in to SSA.gov. There, you can find your estimated monthly payment. This figure is a crucial part of how much you need in the long run.

For example, if you retire at the age of 62, your Social Security benefit might be lower than if you had waited a few extra years. In my case, the benefits amount to around $2,860 per month. Multiply that by 12 to see that it adds up to roughly $34,000 per year from Social Security alone.

Knowing your expected Social Security income is key to building a strong retirement plan.

This information sets the stage. It tells you how much income you can count on every year. Once you know your Social Security benefits, you can better assess what additional sources of income are needed from your investments.

Step 2: Calculating Your Investment Income Need

After knowing the amount from Social Security, the next step is to determine the gap between that figure and your estimated yearly expenses. Given the spending estimate of $60,000 per year, subtract your Social Security income.

In my scenario, the calculation is straightforward. With Social Security providing about $34,000 a year, I would need to generate an additional $26,000 from my portfolio. This number represents the shortfall that your personal investments must address.

This process is not only simple but also very practical. It allows you to see exactly how much more income is required to support your lifestyle in retirement. The clarity of this gap helps you focus on growing your savings or adjusting your spending today.

Average retirement spending is about $60,000 per year.
Social Security income (example): $34,000 per year.
Required additional income: $26,000 per year.

Step 3: Utilizing the 4 Percent Withdrawal Rule

The third step uses a popular guideline known as the 4 percent rule. This rule is widely used to estimate the amount of money needed in your investment portfolio. The idea is that you should be able to withdraw 4 percent of your portfolio annually without depleting your funds.

With the required extra income determined in the previous step, you divide that number by 4 percent. In the example, $26,000 divided by 0.04 results in a total needed portfolio of $650,000.

This method offers a clear goal. With a portfolio target in hand, you can plan your savings and investments more effectively. It provides both an objective number and peace of mind as you approach retirement.

By applying the 4 percent rule, I determined that I need $650,000 in investments to help fill the gap in my retirement income.

It is important to review this calculation periodically. Changes in expenses, lifestyle, or even the Social Security benefits can affect the final number. Keeping track of these elements helps ensure that the retirement strategy remains on course.

Putting the Plan Into Perspective

This three-step process is all about clarity and preparedness. It cuts through the complexity, allowing for straightforward planning. Early in my career as a Certified Financial Planner, I realized that many clients are overwhelmed by the myriad of advice offered by various experts. Simplifying the calculations can significantly reduce confusion.

With this plan, I can confidently share insights that have helped me, as well as many others, work towards a secure retirement. I have seen firsthand how a systematic approach helps people feel more in control of their financial future.

Making Adjustments and Next Steps

Life does not remain static, and neither should your retirement plan. Various factors can influence your retirement spending. Changes in lifestyle, healthcare costs, or even inflation are important considerations. I always recommend reviewing your plan if any major life change occurs.

Here are some steps you might consider as you refine your plan:

Review your Social Security estimates regularly.
Revisit your expense budget and make any necessary adjustments.
Stay informed about changes in withdrawal strategies.

These steps are important to ensure that your retirement planning remains responsive to your current needs. Adjustments may be needed as your expectations change. Monitoring these changes doesn’t have to be overwhelming when you break them down into smaller parts.

Additional Considerations

A few tips can add more value to your retirement planning:

Keep an eye on how expenses may change over time.
Talk to a financial expert if you’re unsure about the numbers.
Remember that planning is an ongoing process rather than a one-time calculation.

While the numbers provide a foundation, your retirement plan should evolve. Market conditions and personal circumstances can alter your situation. It is helpful to dedicate some time each year to review your plan. This fosters better savings habits and investment decisions.

Let me share a common scenario: A friend recently reviewed her Social Security estimate and realized that it was less than she had expected due to early retirement. She recalculated her needs using the three-step method and discovered that she needed to increase her investment contributions. This small adjustment brought her closer to her retirement goal.

Real-World Application

My journey in financial planning has shown me the value of using a clear method for retirement calculations. I have had many discussions with clients who fear the complexities of retirement planning. Reflecting on these experiences reinforces the idea that straightforward, easy-to-understand processes are most effective.

Visualizing these steps helps maintain focus:

Assess: Begin by determining what you receive from Social Security.
Subtract: Calculate the difference between your annual expenses and Social Security income.
Calculate: Use the 4 percent rule to find your target portfolio amount.

Although these steps are straightforward, their impact is meaningful. For many, having actual numbers to work with brings a sense of encouragement. It is empowering to know precisely what you need. With clear numbers, you are better prepared to face unexpected changes.

I have also emphasized to clients the importance of re-evaluating these figures. Life changes, and your plan should change with it. Adjustments can include revisiting your Social Security benefits, updating your living expenses, or even reconsidering your withdrawal rate as you age. Regular check-ins with your investment portfolio can keep your strategy aligned with your goals.

Final Thoughts on Retirement Planning

Retirement planning does not have to be a mystery. The three-step process discussed is easy to follow and helps to set clear financial targets. I encourage everyone to use this method as a starting point when thinking about retirement.

Breaking down the journey into manageable steps makes the goal of a comfortable retirement less daunting. In my experience, clarity leads to confidence. This confidence can transform the way you approach saving and investing.

As you work towards retirement, remember that regular review and adjustment are essential to the process. This method provides a roadmap. Let it guide you as you create a secure and fulfilling future.

In conclusion, by taking time to calculate the required income, subtracting what Social Security provides, and applying the 4 percent rule, you can outline a clear financial target. I believe this practical approach will help many navigate their own retirement planning. If you remain dedicated to reviewing your strategy and making adjustments as needed, you can enjoy your retirement with peace of mind.

By Taylor Sohns

The views and opinions expressed are those of the authors. They are meant for general informational purposes only and should not be construed or interpreted as a recommendation or solicitation. NTD does not provide investment, tax, legal, financial planning, estate planning, or any other personal finance advice. NTD holds no liability for the accuracy or timeliness of the information provided.