Tax Gross Up Formula & How to Calculate Gross Up
1/13/2017 · Tax Gross Up Formula & How to Calculate Gross Up. Published on January 13, 2017 ... The flat method is a flat percentage calculated on the taxable expenses and then added to the income. For example, an employer will gross up at a rate of 25% for taxable expenses. If the transferee is paid $1,000, the gross up would be 25% of this, or $250, and ...