---
kind: "section"
citation: "5 C.F.R. § 1645.1"
title: "5"
number: "1645.1"
heading: "Definitions."
url: "https://uscodex.org/cfr/5/1645.1"
---

# §1645.1. Definitions.

- (a) Definitions generally applicable to the Thrift Savings Plan are set forth at [5 CFR 1690.1](/cfr/5/1690.1.md).
- (b) **As used in this part—** Accrued means that income is accounted for when earned and expenses are accounted for when incurred.

  Administrative expenses means expenses described in [5 U.S.C. 8437(c)(3)](/usc/5/8437.md?p=c-3).

  Basis means the number of shares of an investment fund upon which the calculation of a share price is based.

  Business day means any calendar day for which share prices are calculated.

  Forfeitures means amounts forfeited to the TSP pursuant to [5 U.S.C. 8432(g)(2)](/usc/5/8432.md?p=g-2) and other non-statutory forfeited amounts, net of restored forfeited amounts.


## Notes

### Authority

Authority: 5 U.S.C. 8439(a)(3) and 8474.

### Source

Source: 68 FR 35502, June 13, 2003, unless otherwise noted.