In the payment of any tax not payable by stamp, a fractional part of a cent shall be disregarded 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 not be disregarded in the computation of taxes.
source: 32 FR 15241, Nov. 3, 1967, unless otherwise noted.
cite as: 26 CFR 301.6313-1