fixed income

Short definition from Wiktionary

Noun

1. 1
   Any type of investment under which the borrower/issuer is obliged to make payments of a fixed amount on a fixed schedule. Broadly, such investments tend to be bonds and are not stocks.
2. 2
   A personal income that does not vary over time, often predominantly from pensions or state benefits; especially, such an income that is low, requiring frugal living.