Money Basics

The most important part of retirement math is the assumptions

Retirement projections depend heavily on returns, inflation, contributions, and time. Scenario testing is more useful than pretending one number is precise.

Prepared byLife Finance Tools editorial
Last updatedAugust 12, 2026
PurposeGeneral financial education
Prepared by A-J | Author brand: 盡職生活|阿J的普通人理財筆記
About the author/site · Vocus @WUCJ ↗ · Editorial policy
Page version: 2026-08-12 | Official or primary sources are preferred for material rules and figures. AI may assist structure, translation, and code, but is not used as the sole factual source.

Assumptions drive the result

Return, contribution amount, time, and inflation can matter more than calculator precision.

Stress-test the plan

Try lower returns, higher expenses, or earlier retirement.

Separate personal assets from official benefits

This website's retirement model is not an official Taiwan pension benefit calculation.

The assumptions matter more than the final retirement number

Retirement age, spending, inflation, investment return, pensions, and longevity can materially change the result. A conservative/base/stress set of scenarios is more useful than treating one projection as a precise answer.

Think in purchasing power

Today's monthly spending will not necessarily buy the same lifestyle decades later. Inflation should be built into the model, and medical, care, rent, or travel costs may move differently from average CPI.

Example: a lower-than-planned return combined with losses early in retirement can create a very different path even if the long-run average return later recovers.

Update the plan regularly

Assets, income, family obligations, and public programs change. Re-running the plan annually is more useful than relying on one projection made many years ago.

Official further reading
General financial education only. This is not individualized investment, lending, tax, or legal advice.

Back to tools