Savings rate

Savings rate is the proportion of income that is not spent, calculated as (income - spending) / income, usually expressed as a percentage over a month or year. A household earning $5,000 a month that spends $4,000 has a savings rate of 20%.

It differs from the absolute amount saved: two households can save the same dollar amount with very different savings rates if their incomes differ, and savings rate is what actually determines how quickly a given spending level can be sustained from accumulated savings or investments, independent of income size. It is closely tied to net worth tracking, since a sustained savings rate is what drives net worth upward over time, assuming saved money is not offset by rising debt.

Savings rate matters most in personal-finance planning because it, more than income alone, determines how long it takes to reach a given financial goal; a higher earner with a low savings rate can take longer to reach financial independence than a lower earner who saves a larger share of income. It is a central metric in the "financial independence, retire early" community. A common pitfall is calculating it from take-home pay inconsistently, sometimes including employer retirement contributions and sometimes not, which makes savings rates reported by different people hard to compare directly.