Drop in bank and card statements. Every business expense gets pulled out, categorized, priced against your federal and state rates, and written to a linked spreadsheet for your CPA.
One thing to be clear about: this is a sorting and estimating tool, not tax advice, and the categories and percentages are a starting point for your CPA to check — especially anything mixed personal/business. Rates are current published 2025 figures; the state number is a marginal-rate estimate you can overwrite.