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1Scan for outdated or missing drivers - takes under a minute2Repair Windows errors before they cause bigger problems3Fix the driver behind crashes, sound loss and screen glitchesEstimate whether your retirement savings can last by projecting the annual gap between your spending and dependable income, then testing how withdrawals affect your portfolio over a long enough retirement period. The result is a scenario—not a promise. Returns, inflation, taxes, spending, and lifespan can all differ from your assumptions.
What determines whether your savings will last?
The key figure is not your account balance by itself. It is the amount your savings must provide after other income is applied to your expected spending, year by year. A household with a smaller portfolio and substantial pension income may face a different withdrawal burden from one with a larger portfolio but no pension.
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A useful estimate therefore connects three things: the length of the period you are planning for, the money you expect to spend, and the income available apart from savings. Investment performance, inflation, taxes, and the timing of gains and losses then affect how long the remaining portfolio can support withdrawals.
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Repair common Windows errors and clear accumulated junk for a smoother, more stable PC - no reinstall needed.Free scan · no reinstallNo calculation can guarantee that a portfolio will last for every household. Treat a projection as a way to expose assumptions, compare choices, and identify what would make the plan more resilient—not as a certain prediction or a universal withdrawal percentage.
Step 1: Choose a planning horizon
Decide how many years your estimate should cover before you calculate withdrawals. A horizon based only on an average life-expectancy figure can leave out the possibility that one or both members of a household live longer. If two people depend on the same savings, consider the period for which the surviving partner may need income as well as the period when both are alive.
The Social Security Administration’s Life Expectancy Calculator estimates an average using sex and date of birth. SSA says it does not account for health, lifestyle, or family history, so use the result as a reference point rather than a personal prediction or a cutoff for planning.
There is no single horizon established as right for every person. Make the period explicit in your spreadsheet or calculator, and test a longer period if the plan becomes dependent on a shorter one. A longer horizon generally means savings may need to fund more years of withdrawals, although actual results depend on income, spending, and investment outcomes.
Step 2: Estimate spending in retirement
Start with your own likely expenses rather than a generic annual spending figure. Build an annual estimate and separate costs that behave differently. This makes it easier to see which spending is essential and which might be adjusted if the portfolio performs poorly.
- Recurring essentials: housing, utilities, food, transportation, insurance, and other regular needs.
- Discretionary spending: travel, hobbies, dining, gifts, and other expenses that may be easier to change.
- Health-related costs: premiums, out-of-pocket expenses, and other care costs you expect to pay.
- Taxes: taxes that may apply to income and withdrawals, taking account type into consideration.
- Irregular large expenses: home repairs, vehicle replacement, or other costs that do not occur every year.
Use a separate line for a large expense in the year you expect it, or set aside an annual amount for it. Do not make a lumpy expense disappear by averaging it into a number without noting the assumption: the timing can matter when withdrawals are coming from a portfolio.
Distinguish today’s dollars from future dollars. If your estimate is expressed in today’s purchasing power, your projection needs to account for inflation; otherwise, future expenses may look artificially small. You do not need to pretend that inflation will follow one exact path. Instead, identify your assumption and include a higher-inflation scenario.
Step 3: List dependable income by year
Record expected income separately from portfolio withdrawals. For a U.S. household, this can include Social Security benefits, pension income, and other dependable income. Note when each source is expected to begin, whether its amount changes over time, and who receives it. A start date matters: income that begins later does not cover the same early-retirement gap as income already being paid.
Use a personalized Social Security estimate rather than inserting a generic benefit amount. SSA’s benefit estimate is based on an individual earnings record and allows you to compare claiming ages and adjust expected future earnings. It estimates benefits; it does not project whether your portfolio will last. SSA’s calculator description identifies the Online Calculator as an easier starting point for ordinary future-benefit estimates and reports Detailed Calculator version 2026.2, released July 13, 2026.
SSA also cautions that “Social Security was never intended to be your only source of retirement income.” Include the benefit in the income side of the estimate, but do not treat it as a substitute for calculating the savings gap.
Step 4: Calculate the annual amount savings must cover
For each year of the projection, subtract dependable income from estimated spending. The difference is the initial amount that must come from savings or another source. Adjust the calculation for taxes and account characteristics so the amount represents what your household can actually spend, not just a gross withdrawal.
Annual portfolio need = estimated spending − dependable income
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For example, suppose a hypothetical household estimates $70,000 of annual spending and $35,000 of dependable income for a particular year. The arithmetic leaves a $35,000 gap before adjusting for taxes, account types, inflation, or any other assumptions. Those figures are an illustration of the calculation, not a recommended budget or a claim about typical retirement costs.
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Repeat the calculation for each year, rather than assuming the gap is identical throughout retirement. Spending can change, a benefit or pension may start later, and taxes or required withdrawals can alter the amounts taken from different accounts. Keep a negative gap visible if income exceeds spending in a year; it is not a portfolio withdrawal need for that year.
Step 5: Project withdrawals under more than one scenario
Use the annual gap to model what happens to savings. At a minimum, make the assumed investment return, inflation, withdrawal timing, planning horizon, and desired ending balance visible. A projection that assumes the balance reaches zero at the end of its period answers a different question from one that aims to preserve a balance for heirs or future expenses.
FINRA’s Retirement Calculator estimates additional savings needed to fund withdrawals over a specified period. Its calculation assumes a zero balance at the end of that withdrawal period, and FINRA warns that investment returns are difficult to predict. Try different return assumptions rather than reading one output as a personal forecast. The calculator’s ending-balance assumption and period should be understood before interpreting its result.
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Clear out junk files and repair common Windows errorsFree Scan →Fix the driver behind crashes, sound loss and screen glitchesFind Drivers →For a transparent do-it-yourself version, use a year-by-year spreadsheet. Begin with the portfolio balance at the start of the first year, apply your chosen return assumption, subtract that year’s withdrawal, and carry the resulting balance into the next year. State whether a withdrawal happens before or after the assumed return; those conventions can change the result. Apply the same method consistently across scenarios.
Do not mistake a smooth assumed return for a likely sequence of annual results. Two portfolios can experience the same average return over a period but end differently when withdrawals occur if gains and losses arrive in a different order. A weak period early in retirement can be particularly difficult because withdrawals may force more assets to be sold while the balance is down, leaving fewer assets to participate in a recovery.
Stress-test the plan before relying on it
A useful estimate is not a single optimistic case. Run scenarios that reveal which assumptions the plan depends on, and compare the ending balances and the years in which the portfolio becomes strained. The scenarios do not predict what markets or expenses will do; they show how sensitive the result is to changes.
- Lower-return case: use a less favorable return assumption than your central case. Avoid treating a historical average as a forecast.
- Early loss case: test a weak-return period near the start of withdrawals, rather than only a smooth return across the full horizon.
- Higher-inflation or expense case: raise costs or inflation assumptions to see whether spending power remains adequate.
- Longer-horizon case: extend the projection to see how much the outcome depends on the selected end year.
- Spending-flexibility case: model what happens if discretionary spending can be reduced after poor outcomes, while essential expenses remain protected.
Keep each scenario’s assumptions alongside its result. If you change the return, horizon, inflation, or withdrawal pattern all at once, you may not know which change caused the difference. A scenario table can make the comparison legible:
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| Scenario | What changes | What to inspect |
|---|---|---|
| Central estimate | Your stated assumptions for spending, income, returns, and horizon | Whether the projected balance supports the withdrawals through the chosen period |
| Early weak returns | Returns are less favorable near the beginning of withdrawals | Whether withdrawals during the decline leave the portfolio under pressure later |
| Higher costs | Inflation or expenses exceed the central assumption | Whether the annual gap grows faster than planned |
| Longer retirement | The projection continues for more years | Whether the plan relies on a shorter lifespan assumption |
| Flexible spending | Some discretionary withdrawals can be reduced after adverse outcomes | How much flexibility changes the projected result and what spending is protected |
If the plan only works under favorable assumptions, make that dependence explicit. Possible levers include reducing adjustable spending, changing when income begins, saving more before retirement, or reviewing investment allocation. Each lever has costs and trade-offs; a projection can show the direction of the effect but does not determine the right choice for an individual household.
Choose a method that matches the question
A spreadsheet and an online calculator can both be useful, but they do not automatically model the same things. Inspect what each tool asks for and what it assumes before comparing outputs.
| Approach | Useful for | Check before relying on the output |
|---|---|---|
| Year-by-year spreadsheet | Making assumptions, annual gaps, and withdrawal timing visible | Whether the formulas consistently apply returns, withdrawals, taxes, and any changing income or spending |
| FINRA Retirement Calculator | Estimating additional savings needed for withdrawals over a chosen period | Its specified withdrawal period, zero ending-balance assumption, inputs, and return assumption |
A spreadsheet is only as complete as its formulas and inputs. It can help you see how an income start date or an irregular expense changes a year’s gap, but a simple model may omit taxes, account-specific rules, or variable returns unless you include them. An online calculator can make a calculation easier, but its output still reflects its built-in method and the information you enter.
Neither a calculator’s precise-looking result nor a detailed spreadsheet turns uncertain future returns into a known number. Use outputs to compare cases and identify questions to resolve, not to claim certainty about a future balance.
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How you plan to draw income changes the trade-off between a steady spending target and the ability to respond to adverse results. A fixed real-dollar target aims for a more stable amount in purchasing-power terms, while a flexible plan allows some withdrawals to change with circumstances. Neither approach is automatically right for every household.
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| Policy | Potential advantage | Trade-off to evaluate |
|---|---|---|
| Fixed real-dollar target | Provides a more stable spending target | May leave less room to reduce withdrawals after poor investment outcomes |
| Flexible spending plan | Can allow discretionary withdrawals to adjust when the portfolio is under pressure | Household income may vary, so decide in advance which expenses can change |
Another choice is whether retirement income comes only from portfolio withdrawals or is combined with lifetime income such as a pension or annuity. A lifetime annuity can protect against outliving the income it provides, but product terms differ. Review liquidity, inflation protection, survivor provisions, fees, tax treatment, and the contract terms before comparing it with portfolio withdrawals. The SEC’s Managing Lifetime Income material discusses the role of lifetime income, and its annuities overview explains the product category. Do not assume every annuity offers the same protections or features.
The SEC also notes that asset allocation can change with time horizon and that balances in defined-contribution accounts are not guaranteed to be adequate. Allocation is therefore an input to review, not a way to make an uncertain estimate certain. Higher assumed returns do not automatically justify higher spending: volatility, the order of returns, inflation, and the number of years withdrawals continue also matter.
Account for taxes and required distributions
A gross withdrawal is not necessarily the amount available to spend. Tax treatment depends on the account and the circumstances, so a projection that ignores taxes may overstate spendable income or misstate which account is funding a particular year. Keep account balances and intended withdrawals organized by account type, and consult current tax guidance when the calculation could affect a tax decision.
For U.S. retirement accounts, the IRS says required minimum distributions generally begin at age 73 for applicable IRAs and employer plans. Rules vary by account, owner, calculation, first-distribution timing, and exceptions. Check the IRS’s current RMD FAQs for the account and owner involved.
An RMD is a required distribution rule, not a recommendation that the amount is a sustainable spending level. A required withdrawal may exceed what you want to spend, or it may not meet your household’s full income need. Keep the mandatory-distribution calculation distinct from the portfolio-longevity question.
Revisit the estimate as circumstances change
Save the assumptions with the calculation and update it after meaningful changes: a shift in spending or savings, a revised benefit estimate, a change in health or household circumstances, market losses or gains, or tax changes that affect withdrawals. Revisiting the same framework makes it easier to distinguish a change in the facts from a change in the assumptions.
Consider individualized financial or tax advice when the estimate depends on complex account rules, benefit timing, taxes, survivor income, or a decision involving lifetime-income products. A professional can help examine the household’s details, but future market outcomes and lifespan remain uncertain.
A practical worksheet for your estimate
Before using a calculator or meeting with an adviser, assemble a compact record of the inputs. This also makes it easier to spot missing income years, expenses, or assumptions.
- Write down the retirement start year and the last year covered by the projection.
- Estimate annual expenses, separating essentials, discretionary costs, health expenses, taxes, and irregular large items.
- List Social Security, pensions, and other dependable income by year, including expected start dates.
- For each year, subtract dependable income from spending to find the initial portfolio gap.
- Record account balances and identify which types of accounts may fund withdrawals.
- Choose and label assumptions for returns, inflation, withdrawal timing, and desired ending balance.
- Run a central case and adverse cases, including early weak returns, higher costs, and a longer horizon.
- Review which spending could change and whether the projection remains workable under less favorable outcomes.
- Revisit the inputs when household facts, benefits, markets, taxes, or spending materially change.
The worksheet is not a forecast by itself. Its value is that it makes the annual gap and the assumptions behind a longevity estimate visible, so you can question them before making a decision.
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