The 30% rule is a classic budgeting benchmark: keep housing at or below 30% of gross monthly income.
Why the Rule Exists
It creates room for transportation, food, healthcare, debt repayment, and savings.
Where It Breaks Down
In high-cost metros, many households exceed 30% despite stable careers. At the same time, low-debt households in moderate-cost markets may safely operate slightly above 30%.
Better Modern Use
Treat the 30% rule as a warning threshold, not an absolute law. Pair it with DTI, emergency savings targets, and net-income analysis.
Practical Targeting
If you cannot stay below 30%, aim to stay below 35% and maintain a healthy savings buffer while reducing fixed debt obligations.