Who do you contact in IRS.? The same thing has happened to me. I received Form 1045 ES, along with vouchers and no explanation.  As executor of my sister's estate who passed in 2008, I contacted my probate attorney. She reviewed her notes and indicated a payment was reflected on the first account and the second and final account was prepared by another accountant in 2017. I contacted the accountant and he indicated that his files during that period were shedded.  My probate attorney indicated that she has never encountered where estimated taxes were requested years after approval of final accounting.   Who can I contact at the IRS to find out exactly why I'm receiving this form and vouchers?  This is wearing on me because I need an official response as to why I received this form.  I want to do the right thing.  Should I seek assistance from a place like HR Block. What should I do?