This field in the Maintain Tax Codes (MTX) window determines how the system rounds any tax amount it calculates that is a fraction of a penny.
R = Regular rounding. If the decimal is less than .005, the system rounds down. For example, if the system calculates a sales tax of $1.003, it rounds the tax down to $1.00. If the decimal is .005 or greater, the system rounds up. For example, if the system calculates a sales tax of $2.007, it rounds the tax up to $2.01.
T = Truncate. The system always rounds down. For example, if the system calculates a sales tax of $1.009, it rounds the tax to $1.00.
U = Up. The system always rounds up. For example, if the system calculates a sales tax of $3.001, it rounds the tax to $3.01.
The default is R.