A letter of explanation for a mortgage is a short written statement you give your lender to clear up something unusual in your file: a gap in employment, a large deposit, a recent credit inquiry, a late payment, an address that doesn’t match. Underwriters call these flagged items “conditions,” and until each one is resolved, your loan can’t close. A good letter is specific, factual, one page, and backed by documents.
What to Put in the Letter
Keep it to a single page when you can. The underwriter is not reading for style. They need dates, dollar amounts, names, and a clear account of what happened, matched to evidence they can verify.
Header
Start with a header so the letter can be matched to your file at a glance:
- Your full legal name, exactly as it appears on the loan application
- The loan application or reference number your lender assigned
- The date you’re writing
- A short subject line naming the item you’re addressing, such as “Employment gap, March–June 2024” or “Large deposit on April 15, 2025”
Body
One to three short paragraphs is usually enough. Lead with the fact the underwriter flagged (the date and amount of the deposit, the dates of the gap, the name of the creditor that pulled your credit), then explain the cause, then note what document you’re attaching to prove it. Skip the backstory and the emotional framing. If the real explanation is unflattering, say it plainly anyway; underwriters see everything, and a coherent honest account is easier to approve than a story that doesn’t line up with the paperwork.
Signature
Sign and date at the bottom. Electronic signatures are generally fine for a letter of explanation. If you’re unsure which format your lender wants, ask your loan officer.
Documents to Attach
Every claim in the letter should have a document sitting behind it. Attach the evidence right after the letter so the underwriter can cross-reference as they read. Depending on what you’re explaining, that might include:
- Bank statements covering at least the last 60 days, showing both the deposit in question and the source account1Fannie Mae. Verification of Deposits and Assets
- A signed gift letter from the donor confirming the amount and that no repayment is expected
- A bill of sale or title transfer for money from selling a car or other property
- A lease agreement or utility bill to verify a prior address
- The relevant pages of a divorce decree to document debt assigned to an ex-spouse
- Medical bills, layoff notices, severance papers, insurance settlements, or tax returns spanning the period before, during, and after a derogatory event2Fannie Mae. Extenuating Circumstances for Derogatory Credit
- Profit-and-loss statements to support a self-employment income explanation
Gather these before you start writing so the letter and evidence go in as one package.
Writing About the Most Common Triggers
The wording of the letter changes with the item. Here’s what each common flag actually needs from you.
A Large Deposit
Under Fannie Mae guidelines, any single deposit larger than 50 percent of your total monthly qualifying income counts as a large deposit and must be traced.3Fannie Mae. Depository Accounts FHA uses the same 50-percent threshold, measured against total monthly effective income.4HUD.gov. FHA Single Family Housing Policy Handbook The concern is a hidden loan that would create an unrecorded liability.
Name the exact date and dollar amount as it appears on the statement, then identify the source. Gift from a family member: name the donor and reference the attached gift letter. Sale of a vehicle: reference the bill of sale and the deposit record. Tax refund: point to the IRS deposit. Every dollar should trace from origin to your account.
An Employment Gap
A gap of 30 days or more will usually draw a request. Lenders want a consistent two-year work history and confirmation that your current income is stable and likely to continue. Give the exact start and end dates of the gap and the reason: layoff, medical leave, full-time education, planned career change. For education, name the school and the completion date. For medical leave, note the general nature and recovery timeline; you don’t need to disclose private health details. Close with how you returned to stable employment.
A Recent Credit Inquiry
Your credit report lists every inquiry from the last 90 days, and the underwriter needs to know whether any led to new debt, which would change your debt-to-income ratio.5Fannie Mae. Requirements for Credit Reports Name the creditor, say why they pulled your report (rate-shopping for an auto loan, comparing insurance quotes), and state plainly if no new account was opened.
Derogatory Credit
Late payments, collections, judgments, bankruptcies, and foreclosures need written context. For FHA loans in manual underwriting, a letter of explanation with supporting documentation is required for each outstanding collection or judgment.6HUD.gov. Mortgagee Letter 2013-24 – Handling of Collections and Disputed Accounts The underwriter is deciding whether the negative history reflects an inability to manage debt, a disregard for obligations, or extenuating circumstances outside your control.
If extenuating circumstances apply, spell out what happened and attach the paperwork that proves it: a layoff notice, medical bills, an insurance settlement, a divorce decree, or tax returns bracketing the event. If you’re disputing an item that shows late payments within the last 24 months, be prepared to explain the basis for the dispute in the letter.
An Address Discrepancy
When addresses on your credit report don’t match the address on your application, the underwriter may worry about undisclosed property ownership or an identity problem. List every address you’ve used during the relevant period, explain the discrepancy (a prior rental, a mailing address separate from your residence), and attach a utility bill or lease from that address.
Divorce and Shared Debts
If your divorce decree assigns a mortgage payment, car loan, or credit card to your ex-spouse, but the account still shows in both names on your credit report, the underwriter may count those payments against your debt-to-income ratio unless you document the assignment. Identify each affected account by creditor and last four digits, state that the decree assigned the debt to your ex-spouse, and attach the specific pages of the decree.
Self-Employment Income Changes
Underwriters compare at least two years of business tax returns to gauge income stability. If your business income dropped because of a one-time event, such as losing a major client or a natural disaster, the letter should name the cause, describe how the business recovered, and point to profit-and-loss statements or recent bank statements showing stabilization.
If you’ve been self-employed for less than two years, you may still qualify if you spent at least two years in the same field or a related occupation before starting the business.7HUD.gov. Mortgagee Letter 2022-09 Use the letter to connect your prior work to what you do now.
Be Truthful
Everything you write becomes part of the loan file and is subject to federal law. Under 18 U.S.C. § 1014, knowingly making a false statement to influence a federally related mortgage loan is a federal crime carrying a fine of up to $1,000,000, up to 30 years in prison, or both.8Office of the Law Revision Counsel. 18 USC 1014 – Loan and Credit Applications Generally Even something small, like calling a deposit a gift when it was actually a loan, can qualify. An honest explanation of a past hardship is far less damaging than a fabricated one.
How to Submit It
Most lenders want the letter and its attachments uploaded through their secure online portal, where the files land directly in your electronic loan file. Some ask you to send materials to your loan processor through encrypted email. Use whichever secure channel your lender specifies, and don’t send financial documents through regular email.
Once the underwriter has the letter, they compare it against the evidence and the rest of your file. If it holds together, the condition clears and the file moves forward. If something doesn’t match or a question is left open, expect a follow-up request for more information. An outstanding condition keeps the file in a holding pattern, so respond quickly: a late response is one of the easiest ways to push back your closing date.