Federal business tax starts when an individual or corporation applies for a tax identification number. From that point on, the IRS monitors everything done. Dealing with business taxes is even more complicated than personal taxes because you have a different set of deductions as well as things such as capital gains. It is recommended that an experienced business accountant prepare your taxes. If not, a professional tax company should prepare the taxes. While all tax returns are important and closely monitored, federal business taxes are scrutinized even more. There is no room for mistakes with a federal business tax return. There are strict federal guidelines concerning business taxes. This information is available in print and online but only someone with a sound background in taxes and accounting would be able to make sense of it unless it is a small business. If any discrepancy is found by the IRS, it is recommended you contact an attorney who specializes in tax matters. Even if the error was an oversight, and many times it is just that, you will want a lawyer who knows what needs done. Mistakes happen, but in the case of federal taxes, don't take your chances going into court without an experienced attorney.