Earnest money is a good-faith deposit a buyer puts up after a seller accepts an offer, held by a neutral third party and credited toward the purchase at closing. It signals that you are serious about following through, and it is the money most at risk if you back out of the deal for a reason the contract does not protect.
In practice
Say you offer $340,000 on a duplex and the seller accepts. Your contract calls for earnest money of 1.5 percent, which is $5,100. You wire that $5,100 to the title company within three business days, and it sits in a holding account, not the seller's pocket. At closing, the $5,100 is applied against what you owe, so your cash to close drops by exactly that amount.
Now suppose the inspection turns up a failing roof. If your offer kept an inspection window open, you notify the seller in writing inside that window, cancel, and the full $5,100 comes back to you. If instead you change your mind after every protective window has closed, the seller can claim the $5,100 as damages. The deposit is not a fee. It is bargaining weight, and it favors whoever holds the cleaner paperwork.
Why it matters to a small landlord
Earnest money is your first real test of how cleanly a deal is structured. The amount you offer is a negotiation: too low and your bid looks soft, too high and you expose more cash if something goes sideways. The windows that let you recover it are the part that actually protects you, so read them before you sign, not after. When you are running the numbers on a property, treat the deposit as cash tied up rather than spent, and fold the deal into your full underwriting using a worked process like the one in how to analyze a rental property deal. The deposit also shows up later as part of your basis math, which is one line of the larger picture covered in closing costs on investment property.
Earnest money lives next to a few terms worth knowing together. The protective windows that decide whether you get it back are contingencies, the deposit itself usually sits in escrow with a neutral holder, and the period when you verify the property and exercise those windows is your due diligence. Get those three right and the deposit does its job.