How do I know what to put for date I'll pay balance due if I don't know exactly?

https://www.irs.gov/payments/online-payment-agreement-application  IRS website to set up payment plan

SInce you know you are not going to comply, enter any date that makes TurboTax happy.

Select I'll-mail-a-check.

Be sure no bank information is on your tax return.

@rblake-chc