I'm sure I'm overthinking this, but would love some reassurance.

I had a handful of clients lagging on getting me stuff. I hold my boundaries, it's time to extend so we don't rush and make mistakes.  For the clients that owe, I offer auto-debit through Lacerte, queued up for 4/15.

Once I get everyone filed/extended, and if I have bandwidth before 4/15, can I go back and finalize those extended returns where clients have gotten me everything?

i.e., Can I file the return pre-4/15 saying ext payment of $X has been made when that e-payment transaction hasn't happened?  Or should I just hold them for after 4/15 for the extension payments to settle?

I can't imagine the efile would interrupt the extension payment auto-debit, but will there be a mismatch/rejection for extension payments not yet made at time of efile?