what form is used to set up monthly pmts for the irs
If you've already filed, you can apply for a payment plan at the IRS Payment Plans and Installment Agreements webpage: https://www.irs.gov/payments/online-payment-agreement-application
If you haven't filed yet, you can select an installment payment plan in TurboTax. Here's more info: https://ttlc.intuit.com/community/tax-payments/help/can-i-set-up-a-payment-plan-for-my-taxes/00/26515