What happens if I don't have extra money in my account when it's checked? Nothing happens. We only move money that is over the balance that you set. Related articles How do I know Overflow is secure? Can I choose the day Overflow checks my balance? Can I set a maximum withdrawal amount? Is there a limit on my Overflow deposit? Can I skip it if I need more cash on-hand? What is Overflow and how does it work? Comments 0 comments Article is closed for comments.