If approved, it will cost you $50 to set up a instalment payment contract (added to your credit). However, the IRS has just updated its website to allow taxpayers to change their instalment payment agreements online. Individuals can now review their payment data and even the terms of their agreement, including the payment method and other details. Authorized representatives may also access the Site and do so on behalf of their clients. Individuals who are already making payments under a phased agreement with the IRS are not entitled to use Form 9465 and should contact the IRS at 1-800-829-1040 if they need to make arrangements for the payment of additional amounts. . . .