A letter of explanation for a mortgage is a short, signed statement you write at your underwriter’s request to clear up something unusual in your file: an employment gap, a large bank deposit, a late payment, a credit inquiry, an address that does not match. Keep it to one page, stick to facts and dates, and attach documents that back up what you say. Done well, it clears the “condition” the underwriter flagged and keeps your closing on schedule.
What to Put in the Letter
The underwriter is working through a checklist, not reading for style. Give them something they can match to your file in seconds and verify against the documents behind it.
Header
Start with the information that ties the letter to your loan:
- Your full legal name as it appears on the loan application
- Your loan application number
- The date you are writing
- A subject line naming the specific item, such as “Employment gap, March–June 2024” or “Large deposit on April 15, 2025”
Body
One to three short paragraphs is usually enough. Give dates, dollar amounts, names of employers or creditors or donors, and a plain account of what happened. Skip the backstory and the apologies. If you are addressing more than one condition, write a separate letter for each one so the underwriter can clear them independently.
The underwriter will compare every sentence against your bank statements, pay stubs, credit report, and tax returns. If a date or number does not match, you will get another request and your file will stall.
Signature
Sign and date at the bottom. Electronic signatures carry the same legal weight as ink for most mortgage documents under the federal E-Sign Act, and a letter of explanation is not among the narrow exceptions.1Freddie Mac Single-Family. Electronic Loan Documents FAQ If your lender prefers a wet signature on this particular item, your loan officer will tell you.
What to Say for the Specific Item Flagged
What goes in the body depends on what the underwriter is asking about. The common triggers come from Fannie Mae, FHA, VA, and Freddie Mac guidelines, and each one calls for a slightly different explanation.
A Large or Unexplained Deposit
Under Fannie Mae guidelines, any single deposit greater than 50 percent of your total monthly qualifying income counts as a “large deposit” and has to be traced to its source.2Fannie Mae. Depository Accounts FHA uses the same 50 percent threshold against your total monthly effective income.3HUD.gov. FHA Single Family Housing Policy Handbook The underwriter needs to rule out an undisclosed loan.
In the letter, give the exact date and amount as the deposit appears on the statement, then name the source. A tax refund, a vehicle sale, a bonus, a transfer from your own savings account, a gift from a parent — each has its own paper trail. If it was a gift, name the donor and note that a signed gift letter is attached. If it was a vehicle sale, reference the bill of sale and the buyer’s check. The money needs to trace from where it came from to where it landed.
An Employment Gap
A break of 30 days or more in your work history will usually prompt a request. Lenders want a consistent two-year record and confirmation that your current income is stable.
Give the exact start and end dates of the gap and the reason: layoff, medical leave, full-time education, relocation, planned career change. For education, name the institution and your completion date. For medical leave, describe the general nature and the recovery timeline without disclosing private health details. Close by noting how you returned to stable work — the employer, the start date, the role.
Recent Credit Inquiries
Your credit report lists every inquiry from the previous 90 days, and the underwriter needs to confirm none of them became new debt that would change your debt-to-income ratio.4Fannie Mae. Requirements for Credit Reports Name the creditor, say why they pulled your report (shopping for auto insurance, comparing car loan rates, a soft pull from your bank), and state plainly whether a new account was opened.
An Address That Does Not Match
When addresses on your credit report differ from the one on your application, the underwriter may suspect undisclosed property or an identity problem. List every address you have used in the relevant period and explain the mismatch: a previous rental, a mailing address at a relative’s house, a short-term stay during a move. A utility bill or a lease from that period usually settles it.
Late Payments, Collections, Bankruptcy, or Foreclosure
Derogatory items need written context. For FHA loans going through manual underwriting, you have to provide a letter and supporting documentation for each outstanding collection account or judgment, and the underwriter decides whether the history reflects an inability to manage debt, a disregard for financial obligations, or extenuating circumstances beyond your control.5HUD.gov. Mortgagee Letter 2013-24 – Handling of Collections and Disputed Accounts
Fannie Mae applies a similar framework for a prior bankruptcy or foreclosure. Documentation of extenuating circumstances can include a divorce decree, medical bills, a job layoff notice, severance papers, insurance claim settlements, or tax returns from before, during, and after the event.6Fannie Mae. Extenuating Circumstances for Derogatory Credit If you are disputing a derogatory account that shows late payments in the last 24 months, be ready to explain the basis of the dispute and attach what you have.
Self-Employment Income That Dropped
Underwriters compare at least two years of business tax returns to judge income stability. Under FHA guidelines, a decline of more than 20 percent in effective income over that period triggers a downgrade to manual underwriting with closer review.7HUD.gov. Mortgagee Letter 2022-09 If the drop came from a one-time event — a major client loss, a natural disaster, a pandemic shutdown — say what happened, describe the recovery, and attach a current profit-and-loss statement or recent business bank statements that show stabilization.
If you have been self-employed for less than two years, you may still qualify when you worked in the same or a related field for at least two years before starting the business.7HUD.gov. Mortgagee Letter 2022-09 Use the letter to connect that earlier work to what you do now.
Debts From a Divorce
If your divorce decree assigns a mortgage, car loan, or credit card balance to your ex-spouse, the underwriter needs to see it. Otherwise those payments count against your debt-to-income ratio even though you no longer pay them. Identify each account, say the decree assigned it to your former spouse, and attach the relevant pages.
What to Attach
Every claim in the letter needs a document behind it. Put the attachments right after the letter so the underwriter can cross-reference without hunting.
- At least the most recent two months of bank statements showing the deposit and, where possible, the source account8Fannie 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 a vehicle or property sale
- A lease or utility bill to verify a prior address
- The pages of a divorce decree that assign a debt to your ex-spouse
- Medical bills, a layoff notice, or severance papers to support extenuating circumstances for derogatory credit6Fannie Mae. Extenuating Circumstances for Derogatory Credit
- A profit-and-loss statement for self-employment income
Tell the Truth
Everything in the letter becomes part of your official loan file. Under 18 U.S.C. § 1014, knowingly making a false statement to influence a federally related mortgage loan is a federal crime punishable by a fine of up to $1,000,000, up to 30 years in prison, or both.9Office of the Law Revision Counsel. 18 USC 1014 – Loan and Credit Applications Generally It covers any false statement on an application, loan agreement, or supporting document submitted to a federally insured lender.
A seemingly small misstatement counts. Calling a deposit a gift when it was actually a loan is the kind of thing that gets prosecuted. An honest account of a rough stretch is nearly always less damaging to the application than a fabricated one.
How to Send It and What Happens Next
Most lenders have a secure online portal where you upload the letter and the attachments directly to your electronic file. Some ask you to send everything by encrypted email to your loan processor. Use whichever secure channel the lender specifies and avoid regular email for financial documents.
Once the underwriter has your letter, they compare it against the evidence and the rest of your file. If it all lines up, the condition clears and your file moves ahead. If something is off or a question is still open, you will get a follow-up request. Ignoring a condition request, or sending an explanation that falls apart against the documents, can result in a denial.
Gather the attachments before you start writing. The letter and the proof should go in together as one package, and the sooner the underwriter has it, the sooner your closing date stops slipping.