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If an employee didn't receive their direct deposit, it's possible their funds were rejected or deposited into an incorrect account. In the event this occurs, you may be able to recover the funds, depending on the scenario.
If you entered an incorrect account and/or routing number, you and/or your employee can contact the receiving bank to confirm whether the account exists or not. In the event it's a Live Account (meaning it deposited successfully), request a direct deposit reversal once 5 business days have passed from your pay date. The paycheck date will count as the first day.