1. writing a date on a document that is later than the actual date of writing
Usage: present participle of postdate

1. the act or practice of writing a future date on a document
Usage: gerund form

Examples

• She was postdating the check so it wouldn’t be cashed until next week.
• The company prohibited postdating invoices to manipulate quarterly earnings.
• Postdating legal documents can sometimes invalidate them.
• The bank noticed he was postdating his deposit slips.
• Postdating a contract might affect its enforceability.
• The accountant warned against postdating expense reports.