A return target only means something if it comes from your own goals, your own timeline and your own mix of investments.
The mistake
Borrowing an expectation, from a headline, a good year or a friend’s portfolio, or investing with no written goal at all. Without a goal there is no way to tell whether a portfolio is working, and every market move becomes a reason to change course.
The evidence
Long-run expectations are more modest than a single good year suggests. J.P. Morgan’s 2026 long-term capital market assumptions, for the next 10 to 15 years, are 6.7% a year for US large-cap stocks, 4.6% for US aggregate bonds and 6.4% for a 60/40 portfolio, all compound and before fees. (J.P. Morgan Asset Management, 2026 LTCMA, data as of 30 Sep 2025)
Start with a SMART goal
Write each goal so that it is specific, measurable, achievable, relevant to your life and time-bound. “Save for college” is a wish. “Have $120,000 in today’s dollars for two years of college, starting August 2034” is a goal you can plan for and check.
Then test it three ways
One projection hides how much rides on it. Test each goal in a best case, a base case and a worst case. Here is a hypothetical $500,000 balanced portfolio over 10 years, with no further contributions:
| Scenario | Return a year | Value after 10 years |
|---|---|---|
| Best case | 8.4% | $1,120,000 |
| Base case | 6.4% | $930,000 |
| Worst case | 4.4% | $769,000 |
If the goal is met only in the best case, it is not a plan yet. Change the amount, the date or the savings rate until it holds in the base case, and know what you would do in the worst.
What to do instead
- Write each goal as a SMART goal.
- Test it in a best, base and worst case, using published long-run assumptions rather than recent returns.
- Work down the chain: goal, then plan, then allocation, and only then individual investments.
- Judge progress against the goal, not against a friend’s return or an index you never chose.
The tool: a SMART-goal worksheet
| Goal | Amount (today’s $) | By when | Best case | Base case | Worst case | If the worst case happens |
|---|---|---|---|---|---|---|
How this is handled in practice
Every goal is written as a SMART goal and tested in a best, base and worst case before a portfolio is built around it. Financial planning and investment management are offered through Gwynedd Wealth Partners, LLC.
Series · Ten common investor mistakes
- Whose plan are you following?
- Capacity, willingness and requirement: the three sides of risk
- Too concentrated, or too diversified?
- Why popularity makes value harder to judge
- The best days sit next to the worst days
- What you keep, not what you earn
- Do you know your real return?
- Plans fail quietly
- Five checks before you hand anyone your money
- Your savings rate: the lever you control
This article is for education and is not a recommendation to buy or sell any security. Capital market assumptions are estimates, not guarantees, and the illustration is hypothetical. Investment advisory services are offered through Gwynedd Wealth Partners, LLC.