Retirement guide
How to Make Retirement Return Assumptions
A reasonable rate of return for retirement planning is not one universal percentage or a promise about future markets. It is a planning input that should match the investment mix, costs, time horizon, and withdrawals expected in each phase. This guide shows how the two return inputs affect different parts of the calculator.
What is a reasonable rate of return for retirement planning?
Use separate assumptions before and during retirement. Start with a nominal return that is consistent with the planned investment mix, time horizon, and expected costs for each phase, then test lower-return cases. Avoid choosing a rate simply because it makes the retirement result work.
In this calculator, the return before retirement determines how current savings and future contributions grow until the planned retirement age. The return during retirement helps determine the starting balance needed to support inflation-adjusted withdrawals over the selected retirement period.
The calculator's default 7% return before retirement and 5% return during retirement are editable starting inputs. They are not claims about expected market performance and should not be treated as recommended rates.
A reasonable assumption should survive a lower-return test
Start with one set of return assumptions, then lower one rate and compare the result. This shows how much the estimate relies on that rate. Test the return before retirement first, then the return during retirement, and finally lower both.
Why the calculator uses two return assumptions
Saving for retirement and withdrawing during retirement are different cash-flow phases. Before retirement, new contributions are added and have time to compound. During retirement, withdrawals reduce the balance while the remaining investments continue to earn the entered return.
The investment mix may also change as retirement approaches or withdrawals begin. Investor.gov explains that asset allocation is personal and depends on factors such as time horizon and risk tolerance.
Application of returns before retirement
The pre-retirement return is applied after each annual contribution in the projection. A higher assumption compounds current savings and contributions into a larger projected balance at the planned retirement age. A lower assumption reduces that projected balance.
It does not change the required retirement target when all spending, inflation, retirement length, and retirement-return assumptions remain fixed. This makes the pre-retirement return a direct test of the accumulation side of the plan.
Application of returns during retirement
The retirement return affects the balance needed when withdrawals begin. A lower return means the portfolio is assumed to contribute less growth during the withdrawal years, so a larger starting balance may be required to support the same spending period.
When the pre-retirement return remains fixed, changing only the retirement return does not alter projected savings at the retirement start. It changes the required target and therefore the estimated gap or surplus.
Enter nominal returns and keep inflation separate
The calculator expects nominal annual return assumptions. It then combines the retirement return with the separate inflation input using (1 + return) / (1 + inflation) - 1 to estimate the real return used by the savings-target calculation.
With the calculator's default 2.5% inflation assumption, the following examples show how nominal returns translate into real returns. They are mathematical examples, not recommended rates.
| Nominal annual return | Inflation | Calculated real return |
|---|---|---|
| 3% | 2.5% | 0.49% |
| 5% | 2.5% | 2.44% |
| 7% | 2.5% | 4.39% |
A calculator-generated return comparison
All four scenarios start at age 35 with $50,000 in savings, a $1,212 monthly contribution, and retirement beginning at age 65. Spending, inflation, and the retirement period remain unchanged. The contribution is set so the baseline using the calculator's default return rates has only a small surplus; it is an illustration, not a recommended contribution.
The required savings target is calculated from annual retirement spending, the number of retirement years, and the real retirement return after inflation. The calculator first estimates that target in current dollars, then compounds it by inflation to the planned retirement age. Current savings and monthly contributions affect projected savings, not the required target.
| Scenario | Assumption change | Return before retirement | Return during retirement | Projected savings at age 65 | Required savings target | Estimated gap or surplus |
|---|---|---|---|---|---|---|
| Funded baseline | Default return assumptions with a funded contribution level | 7% | 5% | $2,335,402 | $2,335,037 | $365 surplus |
| Lower return before retirement | Reduce the pre-retirement return from 7% to 5% | 5% | 5% | $1,608,821 | $2,335,037 | $726,216 gap |
| Lower return during retirement | Reduce the retirement return from 5% to 3% | 7% | 3% | $2,335,402 | $2,955,295 | $619,894 gap |
| Lower returns in both phases | Use 5% before retirement and 3% during retirement | 5% | 3% | $1,608,821 | $2,955,295 | $1,346,475 gap |
Be consistent about fees, taxes, and investment costs
A return assumption can be stated before or after investment costs. Decide which convention you are using and document it. If a return estimate is before fees, reduce it for expected ongoing costs. If it is already net of fees, subtracting those costs again would understate the assumption.
The calculator does not separately deduct fund expenses, advisory fees, trading costs, or taxes. Tax treatment also varies by account and withdrawal source, so do not treat the return input as a personalized after-tax forecast unless you have adjusted it consistently.
A practical process for choosing and testing returns
- Identify the broad investment mix expected before retirement and during withdrawals.
- Choose nominal return assumptions that are consistent with each mix, time horizon, and expected investment costs.
- Keep inflation in the separate inflation field rather than reducing the return manually and entering a real rate.
- Run the default or documented base case and save its target, projected savings, and gap.
- Lower the pre-retirement return alone, then restore it and lower the retirement return alone.
- Run a combined lower-return case and revisit the assumptions when the investment mix, costs, timeline, or withdrawal plan changes.
Do not increase the return rates to meet your desired retirement targets
Raising a return assumption can close a projected gap without changing savings or spending. That does not make the plan more resilient. Change contributions, timing, or spending in separate scenarios when those are the levers being considered. Selected return rates should correspond to market realities, expected investment costs, and a realistic risk profile for the retirement portfolio.
Important limitations of steady return assumptions
The calculator applies one return before retirement and one return during retirement in every projected year. Actual markets do not move in a straight line. Returns can vary sharply, and losses near the start of retirement can be more damaging when withdrawals occur at the same time.
FINRA's retirement portfolio guidance provides broader context on managing investments while drawing retirement income. This calculator does not model yearly volatility, sequence-of-returns risk, asset allocation, or rebalancing.
Review the methodology limitations and the investment returns risk guide before interpreting any smooth scenario as more than an educational estimate.
Common return-assumption mistakes
- Using a historical average as though it were a guaranteed future return.
- Using the same rate in both phases without considering changes in time horizon, withdrawals, or investment mix.
- Entering a real return while also applying inflation separately.
- Ignoring fees or subtracting the same costs more than once.
- Raising the return assumption simply to eliminate a projected gap.
- Treating a steady annual return projection as a model of market volatility.
Frequently asked questions
What is a reasonable rate of return for retirement planning?
There is no universal reasonable or good rate for every retirement plan. Use a nominal assumption that is consistent with the expected investment mix, time horizon, and costs for each phase, then compare lower-return cases. The calculator defaults are starting inputs, not recommendations or forecasts.
Should I use the same return assumption before and during retirement?
Not automatically. The saving and withdrawal phases have different time horizons, cash-flow needs, and capacity for losses. Use assumptions that reflect the investment mix and costs expected in each phase.
Are the calculator return assumptions nominal or real?
Enter nominal annual returns. The calculator uses the separate inflation input to calculate a real retirement return for the savings target and to inflate contributions and withdrawals.
Should investment fees be included in the return assumption?
Use a return assumption that is consistent about costs. If the expected return is before fees, reduce it for expected investment costs; if it is already net of fees, do not subtract them again.
Does the calculator model market volatility?
No. It applies the entered return as a steady annual rate. Actual returns vary, and the order of gains and losses can materially affect a retirement withdrawal plan.
How should I test a return assumption?
Run a documented base case, then reduce one return at a time. Compare a lower pre-retirement return, a lower retirement return, and a combined stress case without changing other inputs.
Sources and important limits
These resources provide general background for compounding, asset allocation, inflation risk, and retirement portfolio management. They do not provide return forecasts to this calculator.
Reference links
This calculator provides educational estimates only and is not financial, tax, legal, or investment advice.