IRS Form 8829 is used to calculate business use of the home expenses that can be claimed on your tax return. The form looks at direct and indirect expenses and most expenses are taken on a pro-rata basis. The video below has been prepared by tax attorney John McGuire to provide additional information regarding IRS Form 8829. If you have tax related questions or issues, you can contact The McGuire Law Firm to speak with a tax attorney in Denver, Colorado or Golden, Colorado.