IRS Demand Letters: What are They and What You Need ...An IRS Demand Letter is a notice from the IRS stating that you owe them a certain amount […] 12 Mar, 2019 in IRS Payments / Tax Guide / Tax Payments tagged CP504 / irs 2050 / irs 2050 letter / irs cp504 / irs cp91 / IRS demand letter / IRS demand letters / irs letter / IRS letters / irs notice / irs notice cp91 / irs notice of intent to levy / LT11 / notice of intent to levy by Dana (updated 130 days ago)