Taxes killing me with these CertainTeed material write-offs

Just finished my quarterly taxes and the CPA charged me $850 to sort out all the deductions for CertainTeed shingles and underlayment from last year's jobs, but the IRS is still nitpicking every receipt. It's a damn nightmare trying to claim the right amounts for roofing supplies when half my costs are on credit card statements that don't specify shit. Watched that one video from Essential Craftsman on business expenses and it helped a bit, but man, this shit's frustrating.

yeah man, same boat here with the supply write-offs, feels like you're always one receipt away from an audit.