Retirement Savings Target: The Annual Expenses Method

Michael Chen

Michael Chen writes about personal finance fundamentals. Bay Area-based · finance enthusiast for 15 years.

Visual representation of the voice · not a photographic portrait

Quick answer: Take what you expect to spend each year in retirement, subtract the income you will get anyway (Social Security, a pension), and multiply the gap by 25. That is a common starting target based on the 4% withdrawal rule. If you plan to retire early or want more safety, multiply by 28 to 33 instead.↗ Share on X

To find how much you need for retirement, add up what you will spend in one year, subtract the yearly income you will get without touching your savings (Social Security, a pension, rental income), and multiply what is left by 25. If your yearly gap is $30,000, your target is about $750,000. That multiplier comes from the "4% rule": take out 4% of your savings in year one, then adjust for inflation. It is a rule of thumb, not a promise, so many people use 28 to 33 for a bigger margin of safety.

The rest of this article walks you through each step with real math, so you can finish with your own number today.

Why start with expenses instead of income?

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Most online advice says "save 10 times your salary" or "replace 80% of your income." Those shortcuts are easy, but they guess. Two people who both earn $70,000 can need very different amounts. One rents a big apartment downtown. The other owns a paid-off house in a small town.

Your expenses are what your savings actually have to pay for. When you build the target from your own spending, you get a number that fits your life, not the average American's life.

Step 1: How do you add up your yearly retirement expenses?

Pull your bank and credit card statements for the last 12 months. Add up spending by category. Then adjust each line for retirement.

Here is a simple worksheet with a sample household:

Three tips that keep this honest:

1. Use real numbers, not guesses. People often underestimate food and "other" spending. Your statements do not lie.

2. Do not forget lumpy costs. A new roof, a car every 8 to 10 years, or helping a grown child. Spread them out: a $30,000 car every 10 years is $3,000 per year.

3. Be generous with health care. If you retire before 65, you will usually need to buy your own insurance until Medicare starts. That can cost much more than what you pay through an employer today.

Step 2: What income will you get without touching your savings?

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Next, list the money that will arrive every year no matter what your investments do.

• Social Security. Log in to your account at ssa.gov to see your estimated monthly benefit at different claiming ages. Multiply the monthly number by 12.
• Pension. If your employer offers one, ask HR for a written estimate.
• Rental income or part-time work. Only count it if you are confident it will last.

In our example, Social Security is estimated at $1,900 per month, or $22,800 per year. No pension.

Gap = $44,700 − $22,800 = $21,900 per year.

This gap is the only part your savings must cover.

Step 3: What number should you multiply the gap by?

The 4% rule says you can take out about 4% of your savings in the first year and raise that dollar amount with inflation each year after, and your money has a good chance to last around 30 years. Since 4% is 1/25, you multiply your gap by 25.

But your situation may call for a different multiplier:

For our example household retiring at 65:

$21,900 × 25 = $547,500

If they wanted more safety and used 30:

$21,900 × 30 = $657,000

Neither number is "right." The higher one gives more room for bad market years, high inflation, or a long life.

Step 4: How do you handle taxes?

This step trips up a lot of people. Money in a traditional 401(k) or traditional IRA is taxed when you take it out. Money in a Roth IRA or Roth 401(k) generally is not, if you follow the rules.

So if most of your savings sit in traditional accounts, you need to take out more than your gap to cover the tax bill. A simple way to handle it:

1. Estimate your tax rate on withdrawals. Many retirees land in a low federal bracket, but state taxes vary a lot.

2. Divide your gap by (1 − tax rate).

Example with a 12% combined rate: $21,900 ÷ 0.88 = $24,886 per year before tax.

Then multiply by 25: $24,886 × 25 = about $622,000.

Tax rules are complicated and change over time. If your accounts are large or mixed, a tax professional can give you a much better estimate than this shortcut.

Step 5: What about inflation?

Keep everything in today's dollars. That is the trick that makes this method simple. The 4% rule already assumes you raise your withdrawals with inflation each year.

What you should do is recalculate every year. Prices rise, your spending habits change, and your Social Security estimate gets updated. A yearly check-up takes 20 minutes and keeps your target honest.

How far are you from your target right now?

Once you have the number, compare it to what you already have. Then you can see the yearly saving you need.

Say the target is $622,000, you have $180,000 saved, and you are 47 with 18 years to go. You can use any free compound interest calculator (the SEC runs one at investor.gov) to test different savings amounts and return assumptions.

Be careful with return assumptions. Use a modest number. Markets go up and down, and no one can tell you what the next 18 years will bring. Testing a few rates, such as 4%, 5%, and 6% after inflation, shows you a range instead of one shaky answer.

What are the most common mistakes with this method?

1. Forgetting the gap step. Multiplying total expenses by 25, without subtracting Social Security, makes the target look much bigger and scarier than it is.

2. Counting your home as retirement money. You still need somewhere to live. Only count home equity if you truly plan to downsize, and only count the cash you expect to free up.

3. Ignoring health care before 65. For early retirees this can be the biggest line in the budget.

4. Using an old Social Security estimate. Pull a fresh one each year.

5. Treating the 4% rule as a promise. It is based on past market history. The future can be worse. Stay flexible: spending a little less in bad years makes a big difference.

6. Withdrawing a fixed amount no matter what. If the market drops 25% in your first years of retirement, cutting travel for a year or two protects your savings more than almost anything else you can do.

Is this method enough, or do you need a professional?

This method gives you a solid ballpark. It works well if your finances are fairly simple.

You should talk to a fee-only fiduciary financial planner (someone paid by you, not by commissions, and legally required to act in your interest) if any of these apply:

• You want to retire before 60.
• You have a pension, stock options, or a business to sell.
• Your savings are split across traditional, Roth, and taxable accounts.
• You are deciding when to claim Social Security.
• You have a large health condition or care for a family member.

Nothing in this article is personal investment advice. Investing involves risk, including the loss of money.

Your next step: do the math this week

1. Download 12 months of bank and card statements.

2. Fill in the expense worksheet above with your numbers and adjust each line for retirement.

3. Log in to ssa.gov and write down your Social Security estimate at 62, 67, and 70.

4. Subtract that income from your expenses to find your gap.

5. Multiply the gap by 25, then by 30, and write both numbers down.

6. Put a reminder in your calendar one year from today to update the math.

You will finish with a clear range for your retirement number. That range turns a vague worry into a goal you can actually plan for.

FAQ

Is multiplying by 25 enough for everyone?

No. Multiplying by 25 matches a 4% yearly withdrawal, which is a common rule of thumb for a retirement of about 30 years. If you retire early, expect high health costs, or want a bigger cushion, multiply by 28 to 33. A fee-only financial planner can test your number against your real situation.

Should I use my current expenses or future expenses?

Start with current expenses, then adjust. Remove costs that will end (mortgage payments, commuting, saving for retirement itself) and add costs that will grow (health insurance before Medicare, travel, home repairs). Do the math in today's dollars and update it every year.

Do I need to count Social Security?

Yes. Social Security reduces how much your savings must cover. Get your personal estimate from your account at ssa.gov and subtract it from your yearly expenses before you multiply. Benefit rules can change, so some people only count part of the estimate to stay on the safe side.

Educational content, not personalized financial advice. Sources cited where applicable.