Thanks for your response. Not sure what you mean by "the software typically starts the rounding early in the computations."  To be more specific regarding my issue: I'm preparing a California LLC return, i.e, an LLC treated as a partnership.  The entity is making the pass-through tax election for all partners, requiring the entity to make a 9.3% state tax payment. In looking at Form 3804, Line 1 enters $107,362 of income, which is the amount of income I entered in the software. Line 2 has "9.3%" printed on the form. Line 3 shows the product of lines 1 and 2. When multiplying these numbers, I get $9,884.66.  Thus, I want Line 3 to show $9,885.  However, it shows $9,984.  In other words, the software misapplies the normal rounding convention, and I'm trying to figure out how to override the error.  (This may seem like a minor issue but I want to make sure the tax authority doesn't determine that the entity underpaid by $1 and therefore can't use the election. To be on the safe side I want to round up per the normal convention.)