Need EFTPS for an upcoming payment? Allow up to five business days for enrollment.
Start before the deposit deadline and keep enrollment evidence separate from tax-account records. If timing is tight, confirm an official alternative instead of assuming enrollment will finish immediately.
Direct answer
The IRS says a new EFTPS enrollment can take up to five business days to process.
Enrollment does not itself schedule or prove a tax payment. The current EFTPS confirmation, payment instructions and tax-account record control; this is not tax or banking advice.