I need to know when my payment to the irs is due

[fanfare]

Payment is always due on Tax Day, April 15th. (or the next day if a federal holiday).

[VolvoGirl]

If you pay after the April filing deadline they might send you a bill for some interest.

Or are you asking about a different kind of payment like a 1040ES estimated payment?

Here are all the dates    https://ttlc.intuit.com/replies/3302298