What Is My Retirement Number? Find Your Target

A retirement number is not a single magic dollar amount printed on a postcard. When you ask, “what is my retirement number,” you are really asking two connected questions: how much will I need to support my life, and when will my savings, income, and expenses make that possible?

The useful answer is personal. It accounts for the life you expect to live, not a generic rule of thumb built for someone else. Your spending, current savings, home, debt, Social Security timing, and desired retirement age all change the math.

Your retirement number is a moving target

A retirement number is the amount of investable assets and reliable income you need to cover spending throughout retirement. That can sound simple until you consider that retirement may last 20, 30, or more years - and your costs will not stay fixed the whole time.

For one household, the number may need to cover a paid-off home, regular travel, and a longer break from work at age 60. For another, it may include rent in a high-cost city, health insurance before Medicare, and part-time income through the first few retirement years. Neither plan is automatically better. They simply require different resources.

This is why a broad rule such as “save 25 times your annual expenses” can be a helpful starting point but not a final answer. It assumes a withdrawal rate and does not fully capture taxes, Social Security, changing expenses, market returns, or the specific age at which you want to stop working.

Start with spending, not a savings target

The strongest retirement estimate starts with a realistic view of what you spend now and what may change later. You do not need a perfect expense spreadsheet to begin. You do need an honest baseline.

Think about your current monthly spending, then separate costs that may disappear from costs that may continue. A mortgage may be paid off before retirement. Commuting and payroll taxes may fall. On the other hand, travel, hobbies, helping family, or health care could rise.

A practical question is: if you stopped working next year, what would a normal month cost after adjusting for work-related expenses and debt changes? Multiply that annual estimate across retirement, then account for inflation and the income you expect from Social Security, pensions, rental property, or part-time work.

For example, a couple that expects to spend $90,000 a year in retirement may not need to fund all $90,000 from investments forever. If Social Security later provides $45,000 a year, their portfolio may need to cover a smaller gap. But the years before claiming benefits can require more savings, especially if they retire early.

The inputs that shape your number

Your current savings matter, but they are only one part of the picture. A clear projection brings the major pieces together and shows how they interact over time.

Your age and target retirement date

Retiring at 62 versus 67 changes the plan in several ways. You have fewer years to save and invest, more years for your portfolio to support you, and potentially lower monthly Social Security benefits if you claim earlier. Working longer can improve the outlook, but it is not the only lever available.

Your savings rate and future contributions

What you save each month can affect both your eventual assets and your retirement date. A higher contribution may move the timeline forward, while a temporary reduction can delay it. The effect depends on your starting balance, income, investment assumptions, and how many working years remain.

Social Security and other income

Social Security is often a meaningful part of a retirement plan, not an afterthought. The age you claim affects the monthly benefit, so there can be a trade-off between taking income sooner and receiving more later. Pensions, annuities, rental income, and planned consulting work can also reduce the amount your investments need to provide.

Your home and debt

A home can lower future housing costs if the mortgage will be paid off, but it can also create ongoing costs such as property taxes, insurance, maintenance, and association fees. Carrying a mortgage into retirement is not automatically a problem. It just needs to be reflected in the cash-flow plan.

Taxes, inflation, and investment returns

These assumptions can materially change an estimate. Inflation raises future spending. Taxes affect how much of each withdrawal you can actually use. Investment returns influence how long your savings may last, but future market performance is uncertain. A useful projection makes its assumptions visible instead of treating one outcome as a promise.

A simple way to estimate your retirement number

You can get from a vague goal to a personal estimate by answering a few concrete questions.

Estimate your annual retirement spending in today’s dollars. Include housing, food, transportation, insurance, travel, and the expenses that matter to your version of retirement.

Estimate future guaranteed income. Include Social Security at your planned claiming age and any pension or other recurring income you reasonably expect.

Find the annual gap. If you expect $85,000 in spending and $40,000 in Social Security and pension income, your investments may need to provide about $45,000 per year.

Convert that gap into a starting asset target. Using a 4% withdrawal-rate shortcut, a $45,000 annual gap points to roughly $1.125 million. That is not a guarantee or a universal recommendation. It is a starting estimate to test against your age, taxes, investments, and timeline.

Compare the target with your projected savings at different retirement ages. This is where the answer becomes useful. You can see whether your current path reaches the target and which changes have the most impact.

The math is directionally helpful, but retirement is not a one-time calculation. It is a series of decisions. A projection that updates when your income, savings, or plans change is more valuable than a number you write down once and never revisit.

Test the decisions you are actually considering

Most people are not deciding whether to retire in an abstract sense. They are weighing choices such as saving an additional $500 a month, moving retirement from 65 to 63, paying down a mortgage, or taking a year away from work.

Scenario testing turns those choices into trade-offs you can see. If you increase savings, does it change your retirement age by months or by years? If you claim Social Security later, does the higher benefit reduce pressure on your portfolio? If you downsize, does the lower spending meaningfully improve the plan after moving costs and taxes?

There is no universally correct answer. Retiring earlier may be worth a leaner budget or part-time work. Waiting longer may create more flexibility and a larger margin for unexpected costs. The best plan is one that reflects your priorities and shows the compromises clearly.

My Horizon helps you model these scenarios in plain English without bank logins, subscription fees, or a sales conversation. Enter the core details of your financial life, then test the question behind the question: what would need to change for retirement to feel possible on your terms?

Treat projections as a planning tool, not a promise

A retirement projection can give you a real answer, but it cannot predict markets, health expenses, job changes, or every choice you will make over the next few decades. Results depend on the information you provide and the assumptions used. They are informational estimates, not investment advice or a formal financial plan.

That does not make a projection less useful. It makes it useful in the right way: as a clear baseline for better decisions. Review it after a major income change, a home purchase, a new debt, a shift in spending, or a change in your retirement goal.

Your retirement number is not a test you either pass or fail. It is a practical view of where you stand today - and a way to see what tomorrow’s choices could change.