noun
payment date; date of payment
Refers to the scheduled day on which a payment is due, such as for bills, invoices, or salaries.
クレジットカードの支払日は毎月27日です。
The credit card payment date is the 27th of each month.
支払日を過ぎると延滞料金がかかります。
If you miss the payment date, a late fee will be charged.
Compound of 支払 (payment) and 日 (day). The reading しはらいび is a straightforward combination of 支払い (しはらい) and 日 (ひ), with rendaku voicing of ひ to び.