20 CFR § 404.1263
When fractional part of a cent may be disregarded—for wages paid prior to 1987
February 18, 2021
In paying contributions to a Federal Reserve bank or branch, a State may disregard a fractional part of a cent unless it amounts to one-half cent or more, in which case it shall be increased to one cent. Fractional parts of a cent shall be used in computing the total of contributions.