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.
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.
Key point: This guide explains financial concepts and calculator logic. It does not tell you that one investment, loan, or retirement choice is right for you.
Add recurring debt payments first
Include mortgages, personal loans, auto loans, and fixed installment debt. Lenders may define income and debt differently.
A higher ratio means less flexibility
More committed cash flow leaves less room for job loss, rate increases, or household shocks.
Credit limits are not income
Borrowing capacity does not create sustainable income.
Use it with a household budget
A single ratio cannot capture dependents, insurance, or cost of living.
How can you use this in practice?
Put the concept into a calculator and compare at least two or three scenarios. Focus on which assumptions drive the result.
Official further reading
General financial education only. Not individualized investment, lending, tax, legal, or professional advice.