N.Y. Comp. Codes R. & Regs. tit. 20, § 3-1.5
(b) For the purpose of the computation to the nearest dollar, a fractional part of a dollar shall be disregarded unless it amounts to one-half dollar or more, in which case the amount (determined without regard to the fractional part of a dollar) shall be increased by one dollar.
Example:
| Exact amount | To be reported as |
| $500,000.49 | $500,000.00 |
| $500,000.50 | $500,001.00 |
| $500,000.51 | $500,001.00 |
Tax Law, § 171(19)