Many online lenders offer fast funding timelines — some offer same-day funding and others offer financing as soon as one business day after approval. At times, this can sound too good to be true, but for legitimate lenders and financial institutions, it's a common offering that many borrowers take advantage of.  Fast funding is only unreliable when the loan or lender itself is unreliable. If the lender matches any of the potential red flags listed above along with same-day funding, you may be involved in a scam and should direct your attention elsewhere.