Define: Time Horizon

UK Accounting Glossary

Definition: Time Horizon


Full Definition of Time Horizon

A time horizon is a fixed point of time in the future at which point certain processes will be evaluated or assumed to end. It is necessary for an accounting, finance or risk management regime to assign such a fixed horizon time so that alternatives can be evaluated for performance over the same period of time.

Although short term horizons such as end of day, end of week, end of month matter in accounting, generally it is mere summing-up and the simplest mark to market processes that take place at these short term horizons. No scenario analysis or mark to future activities are usually undertaken for such short periods, except for very large portfolios.

The most common horizons used in planning are one “quarter” (a quarter year, or three months), a year, two years, three years, four years (especially in a representative democracy where this is a quite common term of office and election cycle), five years (in corporate planning), ten years, fifteen years (sometimes considered equal to a single human generation), twenty years (likewise), twenty-five years, thirty years (especially in mortgage contracts and treasury bonds, e.g. the long bond issued by the U.S. Federal Reserve), fifty years and one hundred years (sometimes considered equal to seven generations, a time horizon often cited by the ancient Iroquois and modern Greens). There are Japanese corporations rumoured to have five-hundred-year plans, which amount to a sort of official science fiction story or myth to which the company commits itself – these are highly secret and perhaps don’t exist.

Agreeing on a common time horizon for action is particularly important in global policy, as each participant will have very different time horizon habits. Achieving simultaneous policy is quite difficult without an agreement, as those taking action early may be seriously disadvantaged in competition with those taking action late on a regulatory matter.


Cite Term

To help you cite our definitions in your bibliography, here is the proper citation layout for the three major formatting styles, with all of the relevant information filled in.

Page URL
Modern Language Association (MLA):
Time Horizon. Payroll & Accounting Heaven Ltd. March 31, 2020
Chicago Manual of Style (CMS):
Time Horizon. Payroll & Accounting Heaven Ltd. (accessed: March 31, 2020).
American Psychological Association (APA):
Time Horizon. Retrieved March 31, 2020, from website:

Definition Sources

Definitions for Time Horizon are sourced/syndicated and enhanced from:

  • A Dictionary of Economics (Oxford Quick Reference)
  • Oxford Dictionary Of Accounting
  • Oxford Dictionary Of Business & Management

This glossary post was last updated: 20th February 2020.