We have provided sample letters that you can use to request waivers of several different types of IRS penalties. Taxpayers can request relief from penalties.For the failure to file or pay penalty, taxpayers can request that the IRS "abate" the penalties. This guide provides a sample letter to IRS to waive penalty which will help you present your case and request relief from penalties. This letter requests that the Pennsylvania Department of Revenue waive inheritance tax interest and penalties for an estate due to financial hardship. CITY OF PHILADELPHIA - DEPARTMENT OF REVENUE. I need to either call or write the IRS and ask them to waive the penalty. I have until June 7th, but I want to get this done ASAP. Follow the instructions in the IRS notice you received. You also need to complete IRS Form 843 (request for abatement and claim for refund) and enclose it with your request letter.