Large Bank Deposit Flagged by Your Mortgage Lender: What to Do

You’re weeks away from closing on your California home when your loan officer calls: “We need to explain this large deposit in your bank account.” This is one of the most common — and most stressful — surprises in the mortgage process. Here’s why lenders flag deposits, what they need from you, and how to navigate it without derailing your closing.

Why Lenders Care About Large Deposits

Mortgage lenders need to verify that your down payment and closing cost funds are legitimately yours and haven’t been borrowed. An undisclosed loan that shows up as a deposit would secretly add to your debt — changing your DTI and your risk profile without the lender knowing. To prevent this, underwriters review your bank statements for the past 2–3 months and flag any deposit that looks unusual.

A “large” deposit is typically defined as any deposit exceeding 50% of your monthly qualifying income that doesn’t appear to be a payroll deposit. On a $150,000 annual income, that’s any single deposit over $6,250.

What Lenders Will Ask For

When a large deposit is flagged, your lender will request a Letter of Explanation (LOE) plus documentation to support it. The required documentation depends on the source:

The Problem With Cash Deposits

Cash deposits are the hardest to document because there’s no paper trail showing where the cash came from. Lenders can’t accept “mattress money” as a down payment source — it can’t be verified as legitimately yours and not borrowed. If you regularly deposit cash from a business, tips, or other cash income, tell your lender early in the process so they can advise you on how to handle it.

Gift Funds: What You Need to Know

Gifts from family members are allowed for most loan programs, but they require specific documentation. The donor must provide a signed gift letter stating: the amount, that it is a gift (not a loan), the donor’s relationship to you, the property address, and confirmation that no repayment is expected. Lenders will also want to see the transfer — either a copy of the check and deposit, or a wire confirmation.

How to Prevent Deposit Issues

• Consolidate funds early: Move all down payment money into one account at least 60 days before applying — this puts suspicious deposits outside the window lenders review
• Avoid large unexplained transfers: Don’t move money around between accounts for no reason during the mortgage process
• Document everything in advance: Selling a car or stocks? Keep the paperwork before you deposit the proceeds
• Tell your lender about gifts upfront: Don’t wait for the underwriter to flag it — get the gift letter and documentation ready immediately
• Avoid depositing cash: If possible, use checks, wires, or electronic transfers rather than cash for any large amounts during the mortgage process

Will It Delay My Closing?

A flagged deposit doesn’t automatically delay closing, but responding slowly will. If your lender flags a deposit, provide the explanation letter and supporting documentation within 24 hours. The sooner you respond with complete documentation, the faster underwriting can clear the condition and keep your timeline on track.