Every dollar you bring to closing, and every dollar counted as reserves, has to be traced to an acceptable source. That sounds intrusive until you see what the rule protects against. A down payment that turns out to be an undisclosed loan means the borrower owes more than the file shows, and the debt ratio is wrong. A down payment that came from someone with an interest in the sale, like the seller or a builder, can distort the price. Sourcing is how the underwriter confirms that the money is yours, or a proper gift, or an allowed program, and that no hidden debt came with it.
This article explains how sourcing works in practice. It does not print the threshold for what counts as a large deposit, because that is a program definition, and quoting the wrong one either creates busywork or leaves a hole in the file.
The underwriter starts with your asset statements. Most programs ask for the most recent statements on each account being used, covering the period the findings or the guide require, often the last two monthly statements or a quarterly statement. Each statement has to be complete, including the blank pages and the pages that just say "this page intentionally left blank." A missing page leads to a request for the full statement, because a missing page could hide a transaction.
The underwriter then reads every deposit on those statements. Payroll deposits that match your pay stubs are recognized right away. Deposits that stand out from the normal pattern get flagged for sourcing. The flag is a documentation step, and the response is a document.
Each common source has its own paper trail.
Transfers between your own accounts. Provide the statement of the account the money came from, showing the same amount leaving on the same date or close to it. If that account also shows a large deposit, that deposit may need its own source.
Payroll and bonuses. The pay stub showing the payment, matching the deposit.
Tax refunds. The IRS or state deposit descriptor, often enough on its own, or a copy of the return showing the refund amount.
Gifts. A signed gift letter from the donor stating the amount, the relationship, the property address, and that no repayment is expected. Then the paper trail of the money moving: the donor's statement showing the withdrawal and your statement showing the deposit, or a wire from the donor directly to the title company. Each program limits who can give a gift. Family members are generally acceptable. Anyone with an interest in the sale, like the seller, the builder, or the real estate agent, generally is not an acceptable gift donor under agency rules.
Sale of an asset. For a house, the final settlement statement. For a vehicle, the bill of sale, proof of the title transfer, and the deposit. For other property, documentation of ownership, the value, the sale, and the deposit.
Retirement account withdrawals or loans. The statement showing the withdrawal or the loan, the terms if it is a loan, and the deposit.
Insurance settlements, inheritances, and legal settlements. The settlement letter, the estate distribution, or the court document, along with the deposit.
Down payment assistance. The program's own documents, showing the amount and how it will be delivered at closing.
Seasoning is a related idea that often gets mixed up with sourcing. Money is seasoned when it has been in your account long enough, usually through the full statement period the underwriter reviews, that its origin is no longer questioned. A balance that built up slowly from payroll over many months is seasoned. A large deposit that arrived during the statement period is unseasoned, and the underwriter asks for the source.
If the money arrived recently, it is a source question. If it has been there through the entire statement period, it is usually just the balance. Some programs have specific seasoning rules for certain kinds of money, like business funds or cryptocurrency converted to dollars. Those are in the guide.
In a Texas purchase, the earnest money and the option fee leave your account early, often within days of the contract being signed, and go to the title company and the seller. Both are part of your funds to close, and both get sourced. The underwriter typically asks for proof that the earnest money cleared your account, like the bank statement showing the check or wire, along with the title company's receipt. The money in the account before it left also has to be from an acceptable source. If a relative paid the earnest money for you, that is a gift, and it needs a gift letter and the paper trail like any other gift.
Sourcing does not end once the file is submitted. If you receive a gift, sell something, or move money after the first statements were reviewed, the underwriter will see it on the updated statements requested before closing. The same paper applies. Telling the loan officer when it happens is easier than explaining it at the last condition.
The underwriter compares the documents to each other. The amount on the gift letter should match the amount that moved. The date on the bill of sale should line up with the deposit. A transfer from savings should show on both statements.
When they do not match, the underwriter asks again. A letter that says the money came from savings, when the savings statement shows no withdrawal, creates a bigger question than the one it was meant to answer.
Most sourcing headaches happen because money moved in a way that left a thin trail. A few habits help:
Fictional example: a borrower moves money from a savings account to checking the week of the application and only sends the checking statement. The deposit looks unexplained. The savings statement from the same period explains it in one page. That is sourcing in its simplest form. Sending complete statements for every account up front often answers these questions before they are asked.
If a deposit needs explaining, the answer is usually a document plus a short letter of explanation.
If you want to know which deposits on your statements will be flagged before you apply, send me the statements and I will tell you what paper will answer each one. Book a call, or start an application.
Links checked Oct 21, 2026.
About the author: McKade Lively, NMLS 2704474, American Pacific Mortgage Corporation dba True North Home Loans, NMLS 1850.
Equal Housing Opportunity.
Last reviewed: Oct 2026