Use This Before Big Goals
A 60-second inflation check that prevents surprises
Before you commit to a large savings target, spend one minute running it through an inflation check. It is the cheapest step in financial planning and the one most likely to change the number you were about to commit to.
The sixty-second version
Take the amount you think you need and the number of years until you need it. Run it at 3% and note the adjusted figure.
If the adjusted number is close to the original, your horizon is short enough that inflation does not matter much. Proceed with the original.
If the adjusted number is meaningfully higher, use it instead. That is the whole process.
When it changes your plan
For anything beyond five years, the adjustment is usually large enough to change the required monthly contribution noticeably.
On a ten-year goal, inflation adds roughly 34% to the target at 3%. That is not a rounding difference; it is the gap between arriving prepared and arriving short.
On a twenty-five-year goal, the adjustment roughly doubles the target, which fundamentally changes what the plan requires.
- Five years at 3% adds roughly 16% to the target.
- Ten years at 3% adds roughly 34%.
- Twenty-five years at 3% roughly doubles it.
- Under two years, the adjustment is usually not worth making.
- Use a higher rate for education, health care, and some housing markets.
Which goals need it most
Retirement, college funding, and any purchase more than five years out all warrant the check.
Large purchases with long lead times — a house, a business investment, a major renovation — benefit as well, particularly in markets where prices move quickly.
Emergency funds should be rechecked periodically rather than inflated once, since they are based on current spending that rises on its own.
Combine it with the other checks
Inflation is one of three adjustments worth making to any long-term plan. The others are subtracting fees from your return and accounting for taxes.
Running all three together gives you a figure you can act on. Running none of them produces a plan that looks fine and quietly underdelivers.
None of these take long. Together they are perhaps five minutes, against a plan that may run for decades.
What to do with the adjusted number
Once you have the inflated target, recalculate the monthly contribution. It will be higher, and that is the honest figure rather than a pessimistic one.
If the new monthly amount does not fit, the response is the same as with any goal: extend the timeline, reduce the target, or find more money.
Discovering that now is far better than discovering it in year eight, when the options are narrower and the shortfall is larger.
Some goals turn out not to need the adjustment at all because the horizon is short. Running the check tells you which category you are in, which takes a minute and occasionally saves a plan.
Make it part of the routine
Add the inflation check to whatever process you already use for setting goals, so it happens automatically rather than when you remember.
Record the rate you used alongside the goal. Consistency across reviews matters more than picking the perfect number.
Revisit long-term goals every few years with an updated rate, since extended periods above or below the average do accumulate.
The goal is not precision. It is avoiding the specific error of planning a twenty-year goal in today's prices, which is both common and entirely preventable.
Try these inputs
- Five-year goal: today's price at 3% for 5 years
- Ten-year goal: today's price at 3% for 10 years
- Retirement: today's annual spending at 3% to your retirement year