Underwriters can move fast only when they see no ambiguity. A single missing statement, an unexplained large withdrawal, or a recent bounce forces the underwriter to request clarification, which adds hours or days. Same day business funding works because the product is small enough and short enough that underwriters rely almost entirely on bank-statement cash flow rather than tax returns, business plans, or collateral appraisals. If your statements show $500 payday loans online same day or frequent cash advances, underwriters worry you are already over-leveraged, and your file moves to a slower review queue or declines outright.