The Internal Revenue Service (IRS) method for calculating interest has changed over time. Currently, the method for calculating interest is described by the IRS as “daily compounding of interest (i.e., interest computed on interest).” Internal Revenue Service, Internal Revenue Manual, Part 20.2.6.1, available at https://www.irs.gov/irm/part20/irm_20-002-006r.html. In other words, each day interest accrues on the principal