The IRS will assess penalties for a variety of reasons; such as failure-to-file, failure-to-pay, accuracy related penalties, etc. Penalties and interest will often significantly increase your liability. The circumstances under which a penalty abatement will be granted differ depending on which type of penalty has been assessed.
The IRS will grant a penalty abatement if you can show you had "reasonable cause" for not filing or paying your taxes. The IRS has granted penalty abatement requests for some of the following reasons:
Sometimes the IRS will also require you to show that your failure to follow the tax laws was not due to willful neglect and that you acted in good faith.
Businesses must show reasonable cause by proving that they exercised ordinary business care and prudence but were still unable to follow the tax laws.