Down payment and savings
Large deposits and sourcing funds: what lenders ask and why
Lenders need to know that the money you use to buy a home is yours and is not a hidden loan. That is why an underwriter may ask about a single deposit on a bank statement. Knowing the rules lets you document money before anyone asks.
Reviewed November 2026 · Written for Buy Home Tips from the sources listed below
Underwriters read bank statements line by line. A paycheck is easy to explain. A $3,000 deposit from an unknown source raises questions: was it a loan, a gift, the sale of a car? Each answer has different consequences for your approval.
What counts as a large deposit
Fannie Mae's Selling Guide sets a clear test. A large deposit is a single deposit that exceeds 50 percent of the total monthly qualifying income for the loan. When the lender uses bank statements, typically covering the most recent two months, it must evaluate any large deposit.
Only the unsourced part counts. If part of a deposit is documented, for example as a tax refund, the lender subtracts that part before applying the 50 percent test.
Why lenders ask
The concern is hidden debt. If a relative lent you money, you owe a monthly payment the lender has not counted. Fannie Mae requires that if funds from a large deposit are needed for the down payment, closing costs or reserves, the lender must document that they came from an acceptable source.
If the money is not needed to close, the lender can sometimes set the deposit aside and use only your other verified funds.
Documents that explain a deposit
Fannie Mae lists examples of acceptable documentation: your written explanation, proof that you owned an asset and sold it, or a copy of a wedding invitation to support gift funds received at a wedding. In practice, lenders often ask for:
- Sale of an item. A bill of sale and proof of ownership, such as a title.
- Gift. A signed gift letter and proof of the transfer from the donor's account.
- Transfer between your own accounts. Statements for both accounts.
- Refunds and bonuses. A tax refund notice or pay stub showing the bonus.
If documentation is incomplete, Fannie Mae allows the lender to use reasonable judgment based on your debt-to-income ratio, income and credit, and to write down its reasoning. Do not count on that. Clear documents are faster.
FHA's rules on funds and cash
HUD's Handbook 4000.1 requires FHA lenders to document all funds used to qualify for or close a loan. Cash you have saved at home can be used only after it is deposited in a financial institution or held by the escrow or title company. You must explain how you accumulated it and how long it took, and the lender checks whether that is reasonable given your income, spending, expenses and history of using banks. Gifts must meet HUD's donor rules, and cash on hand is not an acceptable source for a donor's gift.
Preparing before you apply
Season your money. Deposits from months ago are less likely to fall in the statements a lender reviews.
Keep transfers simple. Moving money in and out of several accounts creates many lines to explain.
Talk first. Tell your loan officer about gifts, asset sales or bonuses before the money arrives, so you know what paperwork to keep.
Never disguise a loan as a gift. Misstating the source of funds on a mortgage application is serious. If a relative is lending you money, tell the lender.
The bottom line
Fannie Mae treats an unsourced single deposit over 50 percent of your monthly qualifying income as large, and the money must be documented if you need it to close. FHA requires all closing funds to be documented. Gather proof for every unusual deposit, avoid cash you cannot trace, and talk to your lender before money moves.
Mini calculator: is this a large deposit?
Enter your monthly qualifying income and a single deposit. The result applies Fannie Mae's test: an unsourced deposit over 50% of monthly qualifying income counts as large.
Fannie Mae's definition only. FHA, VA, USDA and individual lenders may ask about smaller deposits.
Getting your accounts ready
- Download two complete months of statements for every account, all pages.
- Mark any deposit that is not a regular paycheck.
- Gather proof for each: a sale receipt, a gift letter, a tax refund notice.
- Avoid depositing cash you cannot document.
- Move money between your own accounts early and keep both statements.
- Tell your loan officer about any expected deposit before it lands.
Questions buyers ask
What is a large deposit for a mortgage?
Fannie Mae's Selling Guide defines a large deposit as a single deposit that exceeds 50 percent of the total monthly qualifying income for the loan. Other programs and lenders may ask about smaller amounts.
Why do lenders care where my money came from?
They must confirm the funds are yours and are not an undisclosed loan that would add to your debts. Fannie Mae requires that large deposits needed for the purchase come from an acceptable source.
How do I explain a large deposit?
Fannie Mae's examples of acceptable documentation include a written explanation, proof that you owned and sold an asset, or a copy of a wedding invitation to support wedding gift funds. Bring documents that show where the money came from.
Can I use cash I have saved at home?
Sometimes. For FHA loans, HUD's handbook requires the cash to be deposited in a financial institution or held by the escrow or title company, and you must explain how and over what period you saved it. The lender judges whether that is reasonable given your income and spending.
Sources checked for this page
- Fannie Mae Selling Guide B3-4.2-02: depository accounts
- HUD Handbook 4000.1, Update 18 (August 2026)
- CFPB: prepare to buy a home
Checked November 2026. Programs and limits change; confirm with the source before you rely on a figure.