Each payment on an installment debt includes the repayment of a portion of the principal amount borrowed and the payment of interest on the debt.
Typically, the IRS does not allow taxpayers to have two separate installment agreements simultaneously.
While the IRS typically doesn't allow taxpayers to have two separate installment agreements, adding a new tax debt to an existing installment plan is possible. However, taxpayers must act swiftly before the IRS assesses the new tax balance and potential default occurs, triggering enforcement actions.