Send a typewritten letter to the IRS office that sent the notice. Use the format in the sample letter below.Complete your protest and mail it to the IRS address on the letter that explains your appeal rights. If you've recently changed the name of your Florida business, then you will need to inform the IRS of your name change. Here's how to do it. You can change your tax return. Learn how to change your business name with the IRS. You generally have 30 days to respond to an IRS notice, so there's no reason to ignore it. Always check which tax year the notice relates to. You should file Florida Form.