It sounds as if hurnik is asking about a State or Local tax payment, and most of the replies refer to Federal income tax.
Yes, sorry.
New York State "local" property and school taxes (they're billed separately around here).
While I didn't see a "split" payment option on Official Payment's site, I imagine I could simply submit two separate payments for the total/correct amount.
I know I could do it with Plastiq.
Debating about calling OP to find out for sure.
Or I suppose I could make one payment with OP and the other with Plastiq.