---
kind: "section"
citation: "31 C.F.R. § 359.19"
title: "31"
number: "359.19"
heading: "How is interest calculated?"
url: "https://uscodex.org/cfr/31/359.19"
---

# §359.19. How is interest calculated?


We base all calculations of interest on a $25 unit. We use the value of this unit to determine the value of bonds in higher denominations. The effect of rounding off the value of the $25 unit increases at higher denominations. This can work to your slight advantage or disadvantage, depending on whether we round the value up or down. 3


## Notes

### Authority

Authority: 5 U.S.C. 301; 12 U.S.C. 391; 31 U.S.C. 3105.

### Source

Source: 67 FR 64278, Oct. 17, 2002, unless otherwise noted.