How much to save for retirement: ways to think about it

Almost everyone saving for retirement eventually asks how much is enough. The honest answer is that no single figure fits everyone, because the amount depends on what a person expects to spend, what other income they will have, when they stop working and how long retirement lasts. What can be explained is the method: the handful of inputs that produce a target, and how sensitive the result is to each one.

Why one number does not fit everyone

Two households with the same salary can face very different retirements. One may own a home outright, expect a pension and plan to work until 68. The other may rent, have no pension and hope to stop at 60. The first household may be able to cover its costs with far less savings than the second.

For that reason, a target built from a person's own figures is generally more informative than a number borrowed from a headline. The method has three steps: estimate spending, subtract income that does not come from savings, and translate the remaining gap into a savings amount.

Start with spending

Savings exist to pay for spending, so spending is the natural starting point. Some costs often fall in retirement, such as commuting, payroll taxes and retirement contributions themselves. Others often rise, such as health care and travel. Housing can go either way.

One common approach is to list current annual spending, remove the items that end with work, and add the items that are expected to begin. The result is a rough annual budget in today's dollars.

Subtract income that does not come from savings

Most retirees have some income that arrives regardless of their account balances. Social Security is the largest for many people. Some also have a pension, rental income or part-time work.

A personal Social Security estimate, based on a worker's actual earnings record, is available through a my Social Security account. The estimate changes with the age at which benefits begin: the Consumer Financial Protection Bureau explains that retirement benefits can be claimed as early as age 62 or as late as age 70, and the monthly amount is larger the later it starts. The post on when to claim Social Security covers that decision.

Spending minus this outside income leaves the gap that savings would have to fill each year.

Turning the gap into a savings target

Here is a hypothetical example with round numbers. It illustrates the arithmetic only and is not a prediction or a recommendation.

Suppose a household expects to spend $60,000 a year in retirement. It expects $32,000 a year from Social Security and $8,000 from a small pension. The gap is $20,000 a year.

To convert a yearly gap into a lump sum, planners often divide by an assumed withdrawal rate, meaning the share of the portfolio taken out in the first year. The table shows how much the answer moves when only that assumption changes. The rates are arbitrary round numbers chosen for the arithmetic, and none of them is presented as safe or sufficient.

No one knows in advance which rate a portfolio can sustain. The point of the table is that the target is only as firm as the assumption behind it. The post on the 4% rule and its limits explains where the most familiar of these assumptions comes from and what it leaves out.

What moves the number

Several inputs can shift a target substantially.

• Retirement age. Stopping work earlier means more years of spending, fewer years of saving and, often, a smaller Social Security benefit.
• Length of retirement. Nobody knows their own lifespan. A plan built for 20 years looks different from one built for 35.
• Inflation. Prices generally rise over time. Investor.gov explains that inflation reduces purchasing power, which matters for anyone whose income does not rise with prices.
• Health costs. Coverage before and after Medicare eligibility can be a large and uneven expense. See health coverage if you retire before 65.
• Taxes. Withdrawals from traditional accounts are generally taxable, so $20,000 of spending may call for a larger withdrawal.
• Investment results. Markets can rise or fall, and results cannot be known ahead of time.

Because each of these is uncertain, some people work out a range instead of a single figure.

Rules of thumb and their limits

Many shortcuts circulate: saving a set percentage of every paycheck, having a certain multiple of salary saved by a given age, or aiming to replace a set share of pre-retirement income. These are commonly cited rules of thumb. They can be a quick way to notice that a savings rate is very low, but they are averages of assumptions about a generic worker. They do not account for a pension, a late start, a high cost of living or an early retirement, and meeting one says nothing about whether a specific household will have enough.

Running your own numbers

The SEC's savings goal calculator on Investor.gov shows how much would have to be set aside each month to reach a chosen amount under assumptions the user enters. Changing one input at a time shows which ones matter most.

It also helps to separate what a saver controls from what they do not. Contributions are controllable. As a simple illustration that assumes no investment gain or loss at all, $500 a month for 30 years adds up to $180,000 of contributions. Whatever markets do is added to or subtracted from that base. For the annual ceilings on workplace plan contributions, see 401(k) contribution limits and catch-up contributions.

A target is a planning tool. It is most useful when it is written down with its assumptions, so that when an assumption changes, the target can change with it.