Make a list of deductible expense categories: Use IRS rules or ask your accountant which business expenses are deductible and which are not. Eliminate cash purchases: Take cash purchases off the ...

Auto expenses: This category is most often used for business use of a personal vehicle. Businesses should also deduct rental cars here, not in the travel expense category above.

Make a list of deductible expense categories: Use IRS rules or ask your accountant which business expenses are deductible and which are not. Eliminate cash purchases: Take cash purchases off the ...