How to Write a Letter of Explanation for a Mortgage

An underwriter asks for a letter of explanation when something in the file raises a question the documents alone do not answer. A $14,000 deposit two weeks before application, a credit inquiry from a furniture store, four months between jobs last spring. The letter answers that one question in writing, and it goes into the loan file with your signature on it.

What a letter of explanation is

That origin explains most of what confuses borrowers about these letters. Some LOE requests trace to a written agency rule. Others are the underwriter's own risk judgment, or an investor overlay sitting on top of the agency guideline. Both arrive in the same email, and neither one comes with a template.

The four questions worth answering are the same either way: what happened, when it happened, why it is unlikely to recur, and what documents corroborate it. Everything below builds that letter, starting with the request that produced it.

Before you start

Gather these before you write a word. Writing first and hunting for documents second is how a one-day condition becomes a one-week condition.

• The exact wording of the request. Loan officers paraphrase. Ask for the condition text as the underwriter wrote it.
• The statement page showing the item, with the date and the amount.
• The proof behind the explanation: a bill of sale, a settlement statement, a payoff letter, a termination or offer letter, an insurance check stub.
• Your application copy, so the letter agrees with what you already disclosed.

Plan on 20 minutes for a single-deposit letter and most of an afternoon if the underwriter sent a list of six items, because the documents take the time, not the prose.

What triggers the request

Large deposits: one threshold, three versions of it

Fannie Mae defines a large deposit as "a single deposit that exceeds 50% of the total monthly qualifying income for the loan," and applies it to purchase transactions. On refinances the guide is explicit that documentation or explanation is not required, while the lender still has to account for any liability if the money was borrowed.

Freddie Mac uses a similar 50% test in its documentation matrix, measured against monthly qualifying income plus any asset-derived qualifying amount, and only where the deposit is needed to qualify the borrower.

FHA landed in the same neighborhood recently, and the older rule is still everywhere online. Handbook 4000.1 now requires documentation "for individual deposits of more than 50 percent of the total monthly Effective Income." It then adds a test the conventional guides do not have. The lender must verify that the deposits are commensurate with the borrower's income and savings history, and that no debts were incurred to produce the minimum required investment.

That rule replaced the old threshold of 1 percent of the property's Adjusted Value. HUD's Update 15 transmittal of May 20, 2024 describes the change in its own summary line: large deposits are now documented "using total Effective Income rather than Adjusted Value of the home."

The new rule became mandatory for mortgages with case numbers assigned on or after August 19, 2024. Articles and lender cheat sheets still quoting 1% of the purchase price are describing a retired rule.

The practical difference now sits in the second test rather than the threshold. On a conventional file, a deposit under the line generally passes without comment. On an FHA file, a $3,000 deposit into an account that has never held more than $800 can still draw a question, because the underwriter has to reconcile it with your savings history.

Credit inquiries and new debt

Fannie Mae's guidance sets no time window and does not require a letter. The lender "must confirm that the borrower has not obtained any additional credit that is not reflected in the credit report or the mortgage application," and if credit was obtained, the debt gets verified and the payment gets counted.

FHA sets an explicit window on manually underwritten loans. The Mortgagee "must obtain a written explanation from the Borrower for all inquiries shown on the credit report that were made in the last 90 Days." The widely repeated 120-day version of that rule does not appear in either rulebook.

Assume your credit gets looked at more than once. Freddie Mac's 2024 bulletin specifies that a credit report must generate an inquiry identifiable on subsequent reports, which is to say a hard pull. A lender pulling again later can see what happened in between.

Fannie Mae separately expects lenders to have processes for capturing changes in a borrower's financial circumstances throughout origination. Lenders commonly satisfy that with a refreshed report or an undisclosed-debt check shortly before closing, which is how the car financed during escrow tends to surface.

Derogatory credit, and the rule most borrowers never hear

Whether a late payment needs a letter at all depends on which underwriting path the file is on, and that is the single most useful thing to know before writing one.

On an FHA file that receives an Accept from the TOTAL scorecard, Handbook 4000.1 states that "the Mortgagee is not required to obtain an explanation of collection accounts, Charge Off Accounts, accounts with late payments, Judgments or other derogatory information."

Downgrade that same file to manual underwriting and the requirement inverts. Now the borrower "must provide a letter of explanation, which is supported by documentation, for each outstanding collection account." The rule repeats for each charge-off. A disputed account also needs documentation supporting the basis of the dispute.

One AUS decision separates no letters from five. If a loan officer tells you the collections need explaining, it is fair to ask whether the file is running through TOTAL or being manually underwritten, because the answer changes the work.

Employment gaps

FHA's threshold is six months, and the handbook calls a gap that long an extended absence. The lender may count current income after verifying two things: six months in the current job at case number assignment, and a two-year work history before the absence.

Shorter gaps carry no numeric agency trigger and still draw questions, because the underwriter has to reconcile a 24-month history with pay stubs that skip a quarter. Say what you were doing and when you returned. Parental leave, a contract ending, a move, and school are all ordinary answers.

Gift funds need a gift letter, not an explanation

These are different documents with different signers. The donor signs the gift letter, which per Fannie Mae must specify the actual or maximum dollar amount and include the donor's statement that no repayment is expected. It also carries the donor's name, address, telephone number, and relationship to the borrower. The transfer then gets documented with a copy of the check and deposit slip, or evidence of the electronic transfer.

Your own letter of explanation covers a deposit only when it is not a gift. When it is, produce the donor's letter and the transfer evidence.

Part 1 — What happened, and where the money came from

Name the item by amount and account, then state the source in one sentence. Underwriters match your sentence to a line on a statement, so give them the line.

On June 12, 2026 I deposited $14,200 into my Chase checking account ending 4417. The funds are proceeds from the sale of my 2019 Toyota Tacoma to a private buyer.

The common mistake: describing a category instead of a transaction. "Savings I had accumulated" gives the underwriter nothing to verify, and accumulation is provable only by statements that show the money building over months.

Part 2 — When it happened

Dates convert a story into a timeline someone can check. Use the actual dates on the documents, and if the deposit and the event are days apart, say why.

The buyer paid by cashier's check on June 10 and I deposited it on June 12. The title transfer is dated June 10 and is attached.

The common mistake: approximations. "Sometime in the spring" invites a second request asking for the date.

Part 3 — Why it will not happen again

This part only applies to letters about credit trouble, income disruption, or overdrafts. Deposit letters skip it. Where it does apply, connect the cause to what has changed since.

The two 30-day late payments in March and April 2025 followed a shoulder surgery that put me out of work for eleven weeks. Short-term disability paid 60% of my salary during that period. I returned to full duty on June 2, 2025, and the account has been current for the fourteen months since.

The common mistake: blaming the servicer. Even where a payment posting did go wrong, an unsupported dispute reads as unwillingness to pay. Attach the correspondence or leave the accusation out.

Part 4 — What documents prove it

Close by listing the attachments. Fannie Mae's own examples of acceptable documentation include the borrower's written explanation, evidence of ownership of an asset that was sold, and a copy of a wedding invitation supporting a gift. The letter names the source; the attachment settles it.

Attached: (1) signed bill of sale dated June 10, 2026; (2) Arizona title transfer receipt; (3) copy of the cashier's check; (4) June checking statement with the deposit highlighted.

The common mistake: referencing documents you have not sent, or sending documents that contradict the letter. If the bill of sale says $13,000 and the deposit is $14,200, explain the $1,200 in the same letter.

Post-closing quality reviews put the overall critical defect rate at 1.38% in the fourth quarter of 2025, and income and employment was the leading defect category for the year. ACES attributes the 2025 pattern to documentation completeness and eligibility decisioning pressures. A sample of closed loans gets reviewed again afterward, by someone who was not part of the original conversation.

A sample letter of explanation

The four parts assembled, for a large deposit on a purchase file. Adapt the facts; keep the shape.

Re: Loan #2026-448192 — explanation of deposit, Chase checking ending 4417

To the underwriter:

On June 12, 2026 I deposited $14,200 into my Chase checking account ending 4417. The funds are proceeds from the sale of my 2019 Toyota Tacoma to a private buyer, David Ruiz.

The buyer paid by cashier's check on June 10 and I deposited it on June 12. The Arizona title transfer is dated June 10. The bill of sale shows $13,000; the remaining $1,200 is my regular June 12 commission payment from Sierra Field Services, which posted the same day and appears as a separate line on the statement.

No portion of this deposit is borrowed, and no repayment is owed to any party.

Attached: (1) signed bill of sale dated June 10, 2026; (2) Arizona title transfer receipt; (3) copy of the cashier's check; (4) June 2026 checking statement with both deposits highlighted.

Sincerely, Maria Alvarez June 24, 2026

Date it, sign it, and send it as a PDF rather than an email body, because the processor has to file a document.

What you are signing

A letter of explanation is a statement made to a lender to influence a lending decision. That places it inside 18 U.S.C. § 1014, which covers false statements made to influence federally insured institutions and mortgage lending businesses, and carries a maximum penalty of a $1,000,000 fine, 30 years of imprisonment, or both. The statute turns on the purpose of the statement, reaching anyone who knowingly makes a false statement "for the purpose of influencing in any way" the lender's action on a loan.

The standard the statute sets is falsity. In March 2025 the Supreme Court decided that squarely.

Read that as a description of one statute and nothing broader. Other statutes reach conduct § 1014 does not, an omission that misleads can still sink a file through repurchase or denial, and a letter that shades the truth tends to collide with the documents anyway. Write what is accurate and attach what proves it. For anything with real exposure, involve an attorney; this is general information rather than legal advice.

What happens after you submit

The letter goes to the processor, who attaches it to the condition and returns it to the underwriter. Three outcomes are typical.

Cleared. The condition is signed off and the file moves. You hear nothing, which is the good version.

Reworded and returned. The most common callback is a request for the document the letter described, or a follow-up on a number that does not tie. A $14,200 deposit explained by a $13,000 bill of sale generates a second condition about the $1,200 every time.

Escalated. New facts in a letter can create new conditions. Disclosing that a family member helped with the down payment turns a deposit condition into a gift-documentation condition, complete with the donor's letter and transfer evidence. This is a reason to answer the question asked and stop.

Expect the file to be re-verified before closing regardless of how clean the letter was. Employment gets re-confirmed, and a refreshed credit report catches new debt, which is why the document trail behind your income matters as much as the explanation attached to it.

Keeping the questions from arriving

Most LOE requests are reconciliation problems. Your bank balances, your asset list, and your application are supposed to describe the same financial picture, and the letter exists to patch the places where they disagree.

Borrowers who keep a current personal financial statement hit fewer of these, because the sourcing work happens before the underwriter asks. The same discipline shows up in adjacent products. Deposits that cannot be sourced get stripped from the qualifying total on a bank statement loan, and asset-based programs like asset depletion run on documented account balances. Buying a first home is where the reconciliation is hardest, which is why we wrote a separate walkthrough for first-time buyers and a net worth calculator that needs no signup.

Business borrowers get the same treatment from a different rulebook. An SBA 7(a) file runs the same deposits, the same inquiries, and the same credit history through a lender credit memo, alongside the personal financial statement covered in our SBA Form 413 guide. More posts on preparing borrower documents are in the personal finance archive.