NSF vs Overdraft: How Bank Statement Loan Programs Define Them

So the short version is: with an NSF, the payment is not paid. With an overdraft, the payment is paid and the account usually goes negative. Lender documents don't always follow the consumer definitions. Some of the documents below fold overdrafts into their NSF count.

This is educational, not underwriting or legal advice. Requirements vary by lender and program. The rules quoted below come from specific published documents as of the date checked. Always work from the current guidelines for your program.

The basic difference

The Consumer Financial Protection Bureau (CFPB) explains the two terms like this:

NSF (non-sufficient funds): an NSF fee "may occur when your check or electronic authorization is not paid due to a lack of funds in your account. This is commonly referred to as a “returned” or “bounced” check." [1]
Overdraft: "An overdraft occurs when you don’t have enough money in your account to cover a transaction, but the bank pays the transaction anyway." [1]

So the short version is: with an NSF, the payment is not paid. With an overdraft, the payment is paid and the account usually goes negative. A CFPB research report puts it the same way: if a transaction is declined, "the financial institution may charge a non-sufficient funds (NSF) fee," and if it's approved, "the financial institution may charge an overdraft fee." [2]

There's a third case that matters a lot for mortgage files: protected overdrafts. The CFPB notes that "Overdrafts can also be covered through a transfer of funds from a linked account, credit card, or line of credit." [1] On the statement, that often looks like a transfer in from savings rather than a negative balance.

The CFPB report also mentions fees some banks charge "if an account has a negative balance for a certain number of days, often referred to as a sustained, continuous, or extended overdraft fee." [2] And it points out that "Financial institutions and the general public often use varying terms to describe certain fees and practices." [2] Expect the labels on statements to vary from bank to bank.

How program documents define them

Lender documents don't always follow the consumer definitions. Some of the documents below fold overdrafts into their NSF count. Here's how four published documents word it:

Program document	Definition or rule, as published	Source
Arc Home, Wholesale Lending Announcement 26-003, Access Alt Income bank statement loans	Defines an NSF/overdraft as the bank "accepting a withdrawal which results in the account going into the negative and a fee is charged, or when a check/ACH is presented but cannot be covered by the balance in the account “bounced check” and a fee is charged." It says "Protected Overdrafts, where the borrower has sweep protection from another account or where the financial institution allows the account to go negative and does not charge a fee are NOT included in the NSF count," and "Reversed/refunded NSFs are NOT included in the NSF count."	[3]
Plaza Home Mortgage, Solutions Non-QM 1 Product Snapshot	An NSF is "defined as any of the following: • Transaction is designated as an NSF by the bank. • Transaction is declined. • Transaction results in a negative balance. • Transaction includes overdraft protection fees that are not associated with a pre-arranged link to a savings account or line of credit."	[4]
REMN Wholesale, Access Program (Non-QM) Quick Guide, Bank Statement	"The use of a line of credit or credit card accounts to cover overdrafts is considered an NSF." REMN counts instances: "An instance is defined as one time that an account is overdrawn and subsequently brough[t] current. One instance may have multiple NSFs."	[5]
Silver Hill Capital, Bank Statement product sheet	Overdrafts on an account linked to another depository account or line of credit at the same institution "are not considered in the 3 occurrence limit, as long as the account does not reflect a negative balance." It adds: "A satisfactory LOE is also required for NSFs and Overdrafts."	[6]

What this means in practice:

Some programs count an overdraft as an NSF. Arc Home's definition covers an account "going into the negative and a fee is charged," and Plaza's covers a transaction that "results in a negative balance" [3][4].
Overdraft protection cuts both ways. Arc, Plaza and Silver Hill can leave protected overdrafts out when their conditions are met [3][4][6]. REMN treats overdrafts covered by a line of credit or credit card as NSFs [5].
Reversed fees may not count. Arc Home excludes reversed or refunded NSFs [3]. Keep the statement page that shows the reversal.

A worked example (sample figures)

Sample statement lines for illustration only. Not a real borrower, not any bank's actual wording and not any lender's rule. Real descriptors vary by bank.

One month of a sample business checking account (opening balance $147.40):

Date	Sample description	Amount	Balance after
Mar 3	RETURNED ITEM – INSUFFICIENT FUNDS FEE	–$35.00	$112.40
Mar 3	RETURNED ITEM – INSUFFICIENT FUNDS FEE	–$35.00	$77.40
Mar 9	DEPOSIT	$2,400.00	$2,477.40
Mar 17	CHECK 1042	–$2,653.05	–$175.65
Mar 18	OVERDRAFT ITEM FEE	–$35.00	–$210.65
Mar 20	DEPOSIT	$1,800.00	$1,589.35
Mar 26	OVERDRAFT TRANSFER FROM SAVINGS	$300.00	$1,889.35
Mar 26	ACH PAYMENT	–$1,848.15	$41.20

Reading it:

Mar 3: two returned-item fees on the same day. These are NSFs in the consumer sense: the payments weren't paid. Arc Home and Plaza count same-day items once [3][4], so they would treat this as one occurrence. A raw fee count shows two.
Mar 17–18: an overdraft. The check was paid, the balance went negative and a fee was charged. Under definitions like Arc Home's or Plaza's, this is countable [3][4].
Mar 26: a transfer from savings covered a payment that would otherwise have overdrawn the account. There was no fee and the balance stayed positive. Under the protected-overdraft rules above, this may not count, if the program's conditions are met (some require the linked account's statements) [3][4][6]. Under REMN's rule, overdrafts covered by a line of credit or credit card count as NSFs. REMN also says "A distinction is made between overdrafts that incur a penalty fee (NSF) and overdrafts covered with borrower’s own funds (i.e., accounts tied to a savings account that covers the overdraft)." [5]

Counted fee by fee, this sample month shows three items. Under definitions like Arc Home's or Plaza's, which count same-day items once and leave out qualifying protected overdrafts, it comes to two occurrences [3][4]. Other programs may count it differently. That's why it pays to know the definition before you count.

How to tell them apart on a real file

Read the description, not just the amount. Look for "returned," "insufficient," "NSF," "overdraft," "OD" and "transfer from" wording, and expect it to vary by bank.
Check the running balance. A negative balance after a paid item points to an overdraft. A returned item with no negative balance points to an NSF.
Spot the protection transfers. Transfers in from savings or a credit line right before or after a shortfall can be protected overdrafts. Ask for the linked account's statements if the program requires them.
Note reversals. If the bank refunded a fee, flag the reversal line.
Get the borrower's explanation early. Several programs require or condition their limits on a letter of explanation (see letters of explanation for bank statement loans).

Where StatementReady fits

StatementReady counts NSF and overdraft occurrences separately, by month and account, and warns you when a count is over the limit you set on the loan file. Each matching fee counts (two NSF fees on the same day count as two), and it counts occurrences, not fee dollars. If you leave the limits blank, it uses 3 in 12 months or 6 in 24 months. Set them to match the program you're submitting to.

It doesn't apply a program's same-day, instance, overdraft-protection or reversed-fee rules for you. Check the count against your program's own counting rules, because the program may count the same statements differently. The worksheet shows a running balance, and you can edit and correct the extracted rows. Each statement is checked to the cent against its printed opening and closing balances. Anything that doesn't reconcile, or can't be checked, is marked Unverified, and exports carry that warning.

StatementReady assists your review. It doesn't make lending, credit or underwriting decisions. You and your lender stay responsible for checking the results against program guidelines.

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FAQ

What's the difference between an NSF and an overdraft?
With an NSF, the payment isn't paid because there wasn't enough money. With an overdraft, the bank pays it anyway [1]. The program documents cited here count both, with their own definitions [3][4][5].

Does overdraft protection count against a borrower on a bank statement loan?
It depends on the program. Some leave protected overdrafts out when conditions are met [3][4][6], and REMN counts overdrafts covered by a line of credit or credit card as NSFs [5].

Does a refunded NSF fee still count?
Under Arc Home's announcement, reversed or refunded NSFs are not included in the count [3]. Other programs may not say. Ask your lender.