Select Pay Now and then that you will pay by check. Then go to the IRS Website to set up your installment agreement. https://www.irs.gov/payments/pay[product key removed]llment-agreements
That sounds like to pay the Turbo Tax fees, not a tax due. Do you have a refund? No you can't pay the fees in installments. Try to pay the fees upfront with a credit card or there is a Extra $40 Refund Processing Service charge (45 in California) to have the fees deducted from the federal refund! How to see your fees https://ttlc.intuit.com/community/charges-and-fees/help/how-do-i-review-my-fees-in-turbotax-online/00/26353 For help with fees https://ttlc.intuit.com/community/charges-and-fees/help/what-can-i-do-to-reduce-my-fees/00/26051 How to pay the Online fees https://ttlc.intuit.com/community/payments/help/how-can-i-pay-for-my-turbotax-online-fees/00/27388 What forms of payment does Turbo Tax accept? https://ttlc.intuit.com/community/payments/help/what-forms-of-payment-does-turbotax-online-accept/00/26079