An appraisal gap is the difference between the price you agreed to pay for a home and the lower value the lender’s appraiser assigns to it. So how does an appraisal gap work in practice? Your lender caps its loan at the lower of the sale price or the appraised value, which means the shortfall becomes your problem: you cover it in cash, renegotiate the price with the seller, or walk away from the deal. Which of those paths you can take, and what each one costs, depends on the contingencies in your contract and the cash you have on hand.
The Mechanic That Creates the Gap
Lenders size your mortgage using a loan-to-value ratio. For a purchase, Fannie Mae requires lenders to use the lower of the sale price or the current appraised value as the property value in that calculation.1Fannie Mae. Loan-to-Value (LTV) Ratios Every major loan program follows that rule. When the appraisal comes in at or above the contract price, nothing changes. When it comes in below, the loan shrinks.
A worked example makes it concrete. You’re under contract at $500,000, planning to put 20% down and borrow $400,000. If the home appraises at $500,000, the numbers hold: $400,000 loan, $100,000 down. If the appraisal comes back at $480,000, the lender now bases its 80% on that lower figure and offers $384,000. The seller still expects $500,000. That leaves you $16,000 short of what you need to close, on top of your original $100,000 down payment. Total cash at closing jumps from $100,000 to $116,000.
The gap sits on top of your down payment, not inside it. Buyers already stretching to fund the down payment and closing costs rarely have that extra cushion sitting around, which is why low appraisals kill deals.
Your Three Options When the Appraisal Comes in Low
Bring Extra Cash to Closing
The cleanest fix is paying the difference yourself. On a $600,000 contract that appraises at $580,000 with 20% down, your cash outlay rises from $120,000 to $140,000. The extra $20,000 covers the gap, the lender funds 80% of the $580,000 appraised value, and the seller gets the full contract price. No renegotiation, no delay. The downside is that you need the money.
Gift funds from family can fill the gap on a conventional loan. Fannie Mae allows gift money to cover all or part of the down payment and closing costs on a primary residence, with no minimum contribution from your own funds required on a single-unit home.2Fannie Mae. Personal Gifts The donor signs a gift letter stating the amount, confirming no repayment is expected, and identifying their relationship to you. If a relative is willing to help, this is a legitimate and common way to bridge a shortfall.
Renegotiate the Price
You can ask the seller to drop the price to the appraised value, or to meet you partway. If the gap is $20,000, a common compromise is splitting it: seller lowers the price $10,000, you bring an extra $10,000. Sellers who have already bought their next home, are on a tight timeline, or have thin backup offers are more likely to move. Sellers sitting on multiple competing bids usually won’t.
The appraisal report itself becomes the negotiating lever. If the comparable sales genuinely don’t support the contract price, even a reluctant seller has to weigh the risk that the next buyer’s appraiser will reach the same number.
Walk Away
If you can’t cover the gap and the seller won’t negotiate, walking away is the last option. Whether that costs you anything depends on your contract. Earnest money deposits typically run 1% to 3% of the purchase price, so on a $500,000 home you could be risking $5,000 to $15,000. Whether you keep that money or forfeit it comes down to your contingencies.
How Appraisal Contingencies Protect You
A standard appraisal contingency lets you cancel the contract and get your earnest money back if the home appraises below the purchase price. It is the single most important protection against appraisal gap risk. Without it, you are legally committed to closing at the contract price no matter what the appraiser says, and backing out means forfeiting the deposit.
The contingency comes with a deadline. If the appraisal comes in low, you have to notify the seller within the window the contract specifies. Most standard real estate contracts include the clause by default, but in competitive markets buyers often modify or drop it to make their offers stronger.
One distinction trips buyers up. The appraisal contingency and the mortgage (or financing) contingency are separate. The appraisal contingency covers the property’s value. The mortgage contingency covers your ability to get the loan approved. A buyer who waived the appraisal contingency but kept the mortgage contingency might still have an exit if the low appraisal causes the lender to deny the loan entirely. Deliberately using the financing contingency as a workaround for a waived appraisal contingency is risky and can lead to disputes.
Appraisal Gap Waivers and What They Cost You
In hot markets, buyers waive the appraisal contingency to strengthen their offers. An appraisal gap waiver is a binding promise to cover some or all of the difference between the appraised value and the contract price. Sellers favor these clauses because they remove the biggest reason deals collapse after going under contract.
A full waiver commits you to the contract price no matter what the appraisal says. A partial waiver caps your exposure. You might write, for example, “Buyer will cover an appraisal gap up to $15,000.” If the gap turns out to be $10,000, you bring the cash and close. If the gap is $25,000, you are on the hook for $15,000, and the standard contingency picks up the remaining $10,000, giving you room to renegotiate or exit.
For most buyers, the partial waiver is the smarter play. It signals financial strength without writing a blank check. Set the cap at what you can actually afford to bring on top of your down payment and closing costs. Waiving the contingency entirely without real cash reserves is a gamble with your earnest money: if the gap exceeds what you can cover and no contingency applies, you either find the money or lose the deposit.
Built-in Protection for FHA and VA Buyers
FHA loans include appraisal gap protection that conventional buyers do not get. FHA requires an amendatory clause in the purchase contract stating that you are not obligated to complete the purchase or forfeit your earnest money if the appraised value comes in below the contract price.3U.S. Department of Housing and Urban Development. HUD Handbook 4155.1 Chapter 3 – Amendatory Clause The clause must be signed before the appraisal takes place. You can choose to proceed anyway, but you cannot be forced to.
VA loans include a similar safeguard called the VA escape clause. It states that the buyer will not face a penalty or be required to complete the purchase if the contract price exceeds the VA’s determination of reasonable value. VA borrowers can waive the protection and proceed, but the default position keeps them out of a deal where the home did not appraise.
If you’re using either loan type, confirm the clause is in your contract before you sign. It’s required, but omissions happen, and catching the mistake after a low appraisal is too late.
Challenging the Appraisal Before You Pay the Gap
Before writing a check or renegotiating, consider whether the appraisal was wrong. Appraisers are human, and they sometimes miss relevant comparable sales, misstate square footage, or undervalue upgrades. The formal process for pushing back is called a Reconsideration of Value, or ROV.
Federal interagency guidance treats the ROV as part of a lender’s valuation program. A borrower can request a review when they believe the appraisal is deficient or that additional information could change the value conclusion.4Federal Register. Interagency Guidance on Reconsiderations of Value of Residential Real Estate Valuations The lender decides whether your evidence is relevant, and if it is, forwards the material to the appraiser for review.
The strongest ROV requests include specific evidence the appraiser did not have or did not use:
- Missed comparable sales. Recent nearby sales at higher prices that were not in the original report. Your agent can usually pull these from MLS data.
- Factual errors. Wrong square footage, incorrect bedroom or bathroom count, missing features like a finished basement or a recent renovation.
- Outdated data. Comps from six or more months ago when closer-in-time sales were available.
An ROV has to be resolved before the loan closes, and there is no regulatory right to a second opinion just because you dislike the number. The original appraiser reviews your evidence and either adjusts the value or explains why the original conclusion stands. Submit your evidence quickly. A completely separate second appraisal is harder to get; lenders generally cannot order one unless the first violated professional standards or was not credible. For FHA loans, HUD has added requirements for how lenders handle borrower-initiated ROVs as part of their quality control plans.5U.S. Department of Housing and Urban Development. Mortgagee Letter 2024-07 – Appraisal Review and Reconsideration of Value Updates If your lender does order a second appraisal, expect to pay for it yourself, typically several hundred dollars with no guarantee the new value comes in higher.
The PMI Cost Most Buyers Miss
If you’re putting less than 20% down on a conventional loan, you’ll pay private mortgage insurance, and its cost is tied directly to your LTV. A low appraisal pushes your LTV higher because the lender uses the appraised value as the denominator. Even if your loan amount does not change, the ratio does.
Fannie Mae’s mortgage insurance requirements step up at each LTV tier as the ratio moves through 85%, 90%, 95%, and 97%.6Fannie Mae. Mortgage Insurance Coverage Requirements Higher coverage requirements mean higher monthly premiums. A buyer expecting to land at 85% LTV can end up at 90% after a low appraisal and pay a meaningfully more expensive premium for years.
This is the quiet cost of covering an appraisal gap. Even if you can scrape the cash together to close, you may be locking in higher monthly payments for as long as the PMI stays on the loan. Run the insurance numbers before deciding whether to cover the gap, renegotiate, or walk. The long-term cost of a higher LTV sometimes outweighs the short-term pain of losing the deal.