There was not enough money in my account on April 18 when the IRS tried to withdraw the taxes due. What happens now?

[Lisa995]

IRS will send a bill, with interest and penalty included as well as a Insufficient Funds fee.  If you have the money available, go ASAP to the IRS DirectPay website and get it paid in.  That will stop any additional penalty and interest from accruing on the balance.

https://www.irs.gov/Payments/Direct-Pay