Mortgage reserves: how many months lenders want left after closing
Down payment and closing costs are the money that leaves your account at the table. Reserves are the money that has to still be there the morning after — and on some files they decide the approval.
What a “month of reserves” means
Fannie Mae defines liquid financial reserves as the liquid or near-liquid assets available to a borrower after the mortgage closes. The unit is not dollars but months: the underwriter divides your remaining eligible assets by the full monthly housing payment on the subject property — principal, interest, taxes, insurance and any association dues, the figure lenders call PITIA — and the answer is your months of reserves.
Two consequences follow. First, every dollar you spend at closing reduces reserves one for one, so a larger down payment can weaken the file it was meant to strengthen. Second, reserves scale with the payment, not the price: on a $400,000 loan the payment matters more than the purchase price, which is why a table like $400,000 at 6% is a faster sanity check than any rule of thumb.
How many months the agencies actually require
The requirement is set by the automated underwriting system on a file-by-file basis, but the Selling Guide states the minimums that system works from. As of 2026, for loans run through Desktop Underwriter:
| Transaction | Minimum reserves |
|---|---|
| One-unit principal residence | No minimum stated (the system may still ask) |
| Second home | 2 months |
| Two- to four-unit principal residence | 6 months |
| Investment property | 6 months |
| Cash-out refinance with DTI above 45% | 6 months |
On top of that sits a rule most borrowers meet for the first time when they buy property number two. When the subject loan is a second home or an investment property, the file must also hold reserves against the borrower’s other financed properties, calculated as a percentage of the aggregate unpaid principal balance of those loans: 2% when one to four properties are financed, 4% at five or six, 6% at seven to ten. A borrower with $600,000 of other mortgage balances is therefore carrying a $12,000 reserve obligation before the subject property’s own months are counted.
Everything above is a floor. Manual underwriting, jumbo programs and individual lender overlays go further — six to twelve months is ordinary on a jumbo loan, and portfolio and DSCR investor lenders often set their own bar. Freddie Mac’s guide runs on the same logic with its own wording.
A worked example
An investor buys a duplex. Principal and interest come to $2,180, taxes $410, insurance $95: a PITIA of $2,685. The subject property requires six months, or $16,110. She already owns two rentals with $540,000 of combined balances, adding 2% of that figure, or $10,800. Total reserves the file must document after closing: $26,910. Her down payment and closing costs are a separate problem entirely — and if she funds them by draining the same brokerage account, the loan fails on reserves while looking perfectly affordable on paper.
What counts, and at what value
- Checking and savings, documented with the usual two months of statements and large deposits sourced.
- Stocks, bonds and mutual funds in a taxable brokerage account. Agency rules allow the market value to be used for reserves; some lenders still apply their own haircut, so ask which percentage is being credited.
- Vested retirement funds — IRA, SEP, Keogh, 401(k). This is the provision borrowers most often miss: for reserves, Fannie Mae does not require the money to be withdrawn from the account. For down payment and closing costs it does. So a 401(k) can satisfy a reserve requirement while staying invested.
- The cash value of a life insurance policy, and trust funds the borrower can actually reach.
- Gift funds may be applied to reserves on a principal residence under agency rules; the treatment tightens on second homes and investment properties, so confirm before counting a gift twice. Our guide to gift funds covers the paperwork.
What does not count
The exclusion list is short, specific, and the source of most late-stage surprises:
- Funds that have not vested, including non-vested stock options and non-vested restricted stock — a large equity grant can be worth nothing to the file.
- Stock held in an unlisted corporation.
- Personal unsecured loans. Borrowed money that is not secured by an asset is not reserves.
- Rent-back credits from the seller.
- Interested party contributions and lender credits — see seller concessions for what those may legitimately pay for.
- Cash proceeds from a cash-out refinance of the subject property. You cannot pull equity out of the house and present it back as the reserve for the same loan.
How to present reserves without scrambling
Season the money early: assets sitting in an account for the two documented months raise no questions, while a transfer that lands in week six of the process invites a sourcing letter. Leave the brokerage account alone rather than liquidating it, since the market value counts and a sale creates a paper trail plus a possible tax event. Move nothing between accounts once underwriting starts unless you can show both sides of the transfer. And when the file is thin, remember that reserves are also the strongest compensating factor there is — they are what lets automated underwriting stretch a debt-to-income ratio toward the upper end of the range.
If the requirement is out of reach, the honest options are a smaller loan, a lower-payment structure, or waiting. A HUD-approved housing counselor will review the whole picture for free, and the conventional loan hub lays out how reserves interact with the rest of the guidelines. Claude Loan is an information site, not a lender or a broker.
Frequently asked questions
Do I need reserves to buy my first home?
Usually not as a stated minimum. For a one-unit principal residence, the agency guidelines do not set a required number of months, and many approvals come back with none. The automated system can still ask for reserves on its own when other parts of the file are stretched, and individual lenders may add their own requirement.
Can my 401(k) count if I do not want to withdraw it?
For reserves, yes — Fannie Mae does not require retirement funds to be withdrawn from the account when they are used as reserves, only that they are vested and documented. If the same money is needed for the down payment or closing costs, it has to actually come out.
Does a loan against my 401(k) hurt me?
It reduces the balance available and it creates a monthly payment that generally counts in your debt ratio, so it works against you twice. Borrowing against a retirement account to create reserves rarely nets out in your favor; borrowing against it for the down payment is a different calculation.
Are reserves the same as an escrow account?
No. Reserves are your own money in your own accounts, verified once at underwriting and never handed to anyone. An escrow account is money the servicer holds and spends on your taxes and insurance, explained in our escrow guide.
Sources
Related: Conventional loan requirements in 2026: what Fannie Mae’s guide actually says, Debt-to-income ratio limits by loan type — and how to lower yours, Jumbo loans: requirements, rates and how they differ from conforming, Conventional loans for condos and second homes: the extra rules. Hub: Conventional loan.