Direct answer
Future affordability measures whether your wealth is growing fast enough to keep pace with the rising cost of the specific life you want — a home, a family, retirement, education, healthcare — at your current assumptions.
Unlike CPI, which tracks a broad national basket, future affordability tracks the specific costs that define your future and compares them to your resource-growth trajectory.
The core question
Traditional financial planning asks: How much money will I have?
Future affordability asks the other half: What will my future cost?
If the things you want are compounding faster than the assets you own, your future is becoming less affordable — even if your income looks strong on paper.
How future affordability is measured
Aspire starts with funding at each goal deadline, at these assumptions:
- Goal coverage and deadline shortfall — how much of the goal costs one shared resource pool funds when each goal is due. Earlier payments reduce the money available for later goals; later savings don't erase an earlier shortfall.
- Aspire Rate — the cost-growth assumption for one goal, or the future-cost-weighted average across multiple goals, at these assumptions.
- Aspire Gap — Money path CAGR minus Aspire Rate. It compares percentage growth, including modeled contributions in the reference money path before goal payments. A positive gap doesn't prove the goals are funded.
The separate Personal Inflation Rate calculator reweights a sourced category basket. It doesn't replace the funding calculation.
The full formulas, source handling, and limitations are on the methodology page.
Future affordability vs CPI
| Dimension | Future Affordability | CPI |
|---|---|---|
| What it measures | Whether your wealth keeps pace with your specific future costs | Average price change of a national consumer basket |
| Starting point | Your priced goals + your resource-growth assumptions | A fixed national basket of goods and services |
| Geography | Goal-specific (your zip, your metro) | National average |
| Time horizon | User-defined (your timeline) | Monthly/annual |
| Who it serves | People planning for a specific future | Policymakers and economists tracking broad prices |
| Predicts the future? | No — measures historical cost growth at your assumptions | No — measures observed price changes |
Why this matters
Most financial tools focus on wealth accumulation: how much you have, how much you save, what return you earn. That framing is incomplete if the cost of the life you are working toward is rising faster than your portfolio.
A high-income earner can feel behind despite strong income because the denominator — the cost of the future they want — is compounding independently of their paycheck. A home in their city, childcare for their family, healthcare for their retirement — each has its own growth rate. If those rates exceed the growth of their assets, the gap widens every year, quietly.
Future affordability makes that gap visible and measurable.