MCA field guide
Understanding NSF and negative-day limits
How underwriters distinguish returned items, overdrafts, negative ending balances, and persistent cash-flow stress.
The terms are related, not identical
An NSF usually reflects an item returned for insufficient funds. A negative day may mean the account finished below zero even if the bank paid the item. Lenders may count events, days, fees, or recent-month patterns differently.
Recency and pattern matter
One isolated event followed by stable balances is different from repeated negative stretches near payroll or existing advance withdrawals. Underwriters look for the cause, recovery speed, and whether the pattern is worsening.
Report what the statements support
Do not erase or reinterpret events to fit a threshold. Count consistently, flag uncertain items, and let the lender confirm its method. The paper estimator uses the number entered only as an educational risk signal.
Methodology and corrections
This guide distinguishes calculations, common industry practice, and lender-specific policy. Criteria should be confirmed from the dated source on each lender profile. Report an error through the correction policy.