To help you out, we have provided sample letters that you can use to request waivers of several different types of IRS penalties. Pay property taxes on time.Property Tax Statements are mailed out in October, and are due upon receipt. This guide provides a sample letter to IRS to waive penalty which will help you present your case and request relief from penalties. The penalty is generally calculated at five percent of the tax liability for each month the return is filed late, up to a maximum of 25 percent. The Collin College Student Handbook is for information only and is not intended as a contract, expressed or implied.