The link above is from the IRS. This link provides further links to amazing publications that business can use to better understand how their tax liabilities are to be computed and how to categorize different transactions within your business. There are a number of publications in this link. Click through and find how you can better plan your business with taxes in mind. Who knows, perhaps you were missing a tax you could have written off. Who wouldn't like to save a few bucks. As always, cal (708) 529-7794 to speak to an attorney about your business and how you can reduce your tax liability.