5 CFR § 1645.6 - Basis for calculation of share prices.

---
identifier: "/us/cfr/t5/s1645.6"
source: "ecfr"
legal_status: "authoritative_unofficial"
title: "5 CFR § 1645.6 - Basis for calculation of share prices."
title_number: 5
title_name: "Administrative Personnel"
section_number: "1645.6"
section_name: "Basis for calculation of share prices."
chapter_name: "FEDERAL RETIREMENT THRIFT INVESTMENT BOARD"
part_number: "1645"
part_name: "CALCULATION OF SHARE PRICES"
positive_law: false
currency: "2026-03-24"
last_updated: "2026-03-24"
format_version: "1.1.0"
generator: "[email protected]"
authority: "5 U.S.C. 8439(a)(3) and 8474."
regulatory_source: "68 FR 35502, June 13, 2003, unless otherwise noted."
cfr_part: "1645"
---


# 1645.6 Basis for calculation of share prices.

The total fund basis for a TSP core fund will be the sum of the number of shares in all individual accounts from all sources of contributions in that fund as of the opening of business on each business day.

[70 FR 32215, June 1, 2005, as amended at 87 FR 31681, May 24, 2022]