The difference is a guaranteed installment agreement vs the regular installment agreement. If you meet the requirements below, one of which is paying the full tax liability within 3 years, then the IRS HAS to approve your installment agreement request.
Guaranteed Installment Agreements
As an individual taxpayer, you have the right to an agreement without submitting a financial statement if:
If you don't meet these requirements, then you have to file for another type of installment agreement which can be up to 72 months, but the IRS does not have to approve your agreement and then can request more information from you, such as financial documents. If you owe less than $50,000, then it is possible to also file a streamlined agreement online directly with the IRS. If you owe more than $50,000, then you have to mail by mail using Form 9465.
https://taxpayeradvocate.irs.gov/get-help/installment-agreements#apply
https://www.irs.gov/individuals/online-payment-agreement-application
The difference is a guaranteed installment agreement vs the regular installment agreement. If you meet the requirements below, one of which is paying the full tax liability within 3 years, then the IRS HAS to approve your installment agreement request.
Guaranteed Installment Agreements
As an individual taxpayer, you have the right to an agreement without submitting a financial statement if:
If you don't meet these requirements, then you have to file for another type of installment agreement which can be up to 72 months, but the IRS does not have to approve your agreement and then can request more information from you, such as financial documents. If you owe less than $50,000, then it is possible to also file a streamlined agreement online directly with the IRS. If you owe more than $50,000, then you have to mail by mail using Form 9465.
https://taxpayeradvocate.irs.gov/get-help/installment-agreements#apply
https://www.irs.gov/individuals/online-payment-agreement-application