[header] How to do year end tax prep for your small business [title] Find proof of your business income. [step] You must accurately report your small business income, so diligently find all proof of income. Hopefully, you are organized and have this information in an excel sheet. 
If not, then look for the following : [substeps] Bank statements gross receipts for sales of goods and services sales records proof of returns and allowances interest for business checking and savings accounts any other small business income [title] Match purchase orders with invoices. [step] Go through your paperwork and find all the invoices you sent out for the year.