LT24 does not say an existing installment agreement was terminated. It says the IRS received your proposal to pay monthly but needs additional information before it can establish the agreement.
What the IRS may need
The missing item should be identified in the letter. It may involve financial information, filing compliance, a signature, a proposed payment amount, banking details, or another account issue. Follow the instructions for the specific item rather than sending a generic payment-plan request again.
Respond by the date shown
Provide the requested information by the response date and keep a complete copy with proof of delivery. Continue making any proposed voluntary payments unless the IRS instructs otherwise; doing so does not by itself mean the agreement has been approved.
If you cannot provide an item, contact the number on LT24 before the deadline and ask what substitute documentation is acceptable. For help completing the request, call us at (813) 229-7100.