If you set-up a payment using direct debit
for your income tax payment and you did not specify a payment date for
the withdrawal, TurboTax's default payment date will be
used (the last day of tax season = April 18th this year).
Once your return is accepted, you can't change any of the
payments details, but, you can cancel the electronic withdrawal payment
and use another payment method.
You can call IRS e-file Payment Services anytime at 1-888-353-4537, 7
to 10 days after your return was accepted to cancel your
payment.
You must cancel your payment 2 business days prior to the
scheduled payment date.
Check out "Cancellations, Errors and Questions"
from IRS link below "Pay Taxes by Electronic Funds Withdrawal"
https://www.irs.gov/uac/pay-taxes-by-electronic-funds-withdrawal#errors