Rounding rule for taxes

What i need to do here, are to round down some taxes, but erp are rounding them up.

I want row 1 & 2, to round down the tax, two decimals. 1,05% of net total is 98,877135, i want the tax to be 98.87
for Row 3 & 4, i want it to round it down to 00, so for row 4 i want the number to be 125,0, and not 125,79. same goes for row 3.

How can i proceed to fix this ?