You're correct, the refund and payment do not change, and rounding is being done in accordance with IRS guidelines and instructions:
Here it is from their website (under "Computations": https://www.irs.gov/publications/p17/ch01.html
Computations
The following information may be useful in making the return easier to complete.
Rounding off dollars.
You can round off cents to whole dollars on your return and schedules. If you do round to whole dollars, you must round all amounts. To round, drop amounts under 50 cents and increase amounts from 50 to 99 cents to the next dollar. For example, $1.39 becomes $1 and $2.50 becomes $3.
@fusor2005jhr
