In finance, fallback broadly refers to failure in attaining a desired or expected outcome/ result due to unfavorable or unexpected circumstances, market downturn, and so on. The outcome may be sever financial/ monetary losses, impaired values, declines in investments/ portfolios, etc. Fallback may also imply a reduction or decrease such as in rates or sales or volumes.

Fallback may also mean an alternative plan set to be used in an emergency.

In specific context, fallback may refer to fallback rate.