Short version: on a fix and flip, the proof of funds letter and the earnest money deposit are the two things that decide whether a seller takes your offer seriously, and both come up long before your loan is anywhere near final approval. A proof of funds letter shows you can actually close. The earnest money deposit is the cash you put at risk to hold the deal. Neither one works the way most new flippers assume, and getting either wrong quietly costs you deals in a competitive market.
What a proof of funds letter actually proves
A proof of funds letter, or POF, is a short document that tells a seller you have the money to close. On a normal retail purchase, a buyer shows a mortgage preapproval and everyone understands the loan is coming. On a flip you are usually bidding against cash buyers, and the seller wants to see that you can perform without a shaky financing contingency dragging the deal out for weeks. The POF is how you signal that.
There are two ways to produce one. The first is a letter from your lender or broker confirming you have been vetted and are approved to borrow up to a certain amount. The second is a recent bank or brokerage statement showing you personally hold enough liquid cash to close. On an asset-based rehab loan, the lender you broker to will issue the letter once you are pre-vetted, and that letter is what you attach to offers. It is worth understanding that this letter is conditional. It confirms you are a real, qualified borrower up to a stated amount, not that any specific deal is already underwritten and cleared to fund.
Where investors get the proof of funds wrong
The most common mistake is treating the POF like a loan commitment. It is not. It says you can borrow up to an amount on deals that fit the box, but the specific property still has to appraise, the rehab still has to make sense, and the file still has to clear underwriting. If you want to understand what actually gets checked between offer and funding, we mapped the whole process in our guide to fix and flip loan underwriting.
The second mistake is a stale or mismatched letter. A POF dated three months ago, or one written for two hundred thousand dollars when you are making an offer at two hundred sixty thousand, tells the listing agent you are not organized. Keep the letter current, and have your broker size it to the specific offer so the number on the letter comfortably covers the purchase.
The third mistake is being slow. In a hot market the POF has to go out with the offer, not a day later. If you are pre-vetted with a broker who can turn a fresh letter around the same day, you are competitive. If you have to go get vetted after you find the deal, you have already lost time you may not have. Speed is the whole game here, and we broke down realistic timelines in our post on how fast you can close a fix and flip loan.
Earnest money: the cash you actually put at risk
The earnest money deposit, or EMD, is the good-faith money you put down when your offer is accepted. It gets held in escrow by the title company or the seller’s agent, and it shows the seller you are serious enough to put your own cash at risk. On a standard flip purchase the EMD usually runs somewhere between one and five percent of the purchase price. On auctions and distressed deals it can be higher, and it is frequently non-refundable the moment the hammer falls.
Here is the part new flippers miss: your lender does not fund your earnest money. The EMD comes out of your own pocket, before the loan closes, sometimes before the property is even under contract in a way the lender can see. What the deposit does do is count toward your cash to close. When you get to the closing table, the earnest money you already put down is credited against the total cash you owe, so it is not lost, it is just committed early.
A real numbers example
Take a straightforward deal. Purchase price of one hundred sixty-five thousand dollars, a rehab budget of forty-five thousand dollars, and an after repair value of three hundred thousand dollars. On a normal MLS purchase, a two percent earnest money deposit is thirty-three hundred dollars, wired into escrow within a few days of the offer being accepted.
Say the lender funds ninety percent of the purchase and one hundred percent of the rehab. That is one hundred forty-eight thousand five hundred dollars toward the purchase plus the full forty-five thousand of rehab held back for draws. Your cash to close on the purchase side is the remaining sixteen thousand five hundred dollars, plus closing costs. The thirty-three hundred dollars of earnest money you already put down gets credited against that sixteen thousand five hundred, so at the table you are bringing the difference plus fees, not the full amount again. If you want to see how leverage changes the cash you bring on your own deal, run it through our deal calculator.
Now run the same house as an auction buy. The auction requires a ten percent non-refundable deposit the day you win, which is sixteen thousand five hundred dollars at risk immediately, with no inspection contingency to get it back. Same property, very different cash exposure up front. That is why auction and wholesale deals demand a different plan.
Proof of funds and earnest money on auction and wholesale deals
Auction and wholesale acquisitions are where these two documents matter most, because the timelines are brutal and the deposits are often non-refundable. Many auctions want proof of funds registered before you are even allowed to bid, and they want the deposit wired within hours of winning. A wholesale assignment can give you a week to close and a deposit that is gone if you do not perform. We walk through financing these specific deals in our guide to financing auction and wholesale fix and flip deals, and the common thread is preparation. You cannot scramble for a POF or your deposit cash after you win. Both have to be sitting ready.
How to have both ready before you need them
Three moves keep you competitive. First, get pre-vetted with a broker before you start writing offers, so a fresh, correctly sized proof of funds letter goes out the same day you find a deal. Part of that vetting is a credit pull, and knowing where your score puts you matters, which we covered in our post on the minimum credit score for a fix and flip loan. Second, keep enough liquid cash set aside to cover the largest earnest money deposit you are likely to face, especially if you chase auctions. Third, know your number before you offer, so the POF amount, the deposit, and your cash to close all line up instead of surprising you at the table. Those closing-table surprises are almost always the fees, which we itemized in our breakdown of fix and flip closing costs.
The bottom line
Proof of funds and earnest money are not paperwork you deal with after you get the loan. They are the tools that win the deal in the first place, and they run on your preparation and your own cash, not on the lender’s timeline. Get pre-vetted so your letter is instant and correctly sized, keep deposit money liquid and ready, and know exactly what your cash to close is before you sign anything. Do that and you compete like a cash buyer even when you are financing the deal.
Want a proof of funds letter sized to a specific deal, or a straight answer on how much cash you actually need up front? Call or text 412-990-2941, reach out through our contact page, or read more about our fix and flip and bridge loan options.
FMC Capital is a Pittsburgh-based mortgage brokerage serving real estate investors across Pennsylvania and additional states. Proof of funds terms, earnest money requirements, leverage, and pricing vary by lender, seller, auction, property, and borrower profile and are subject to change. This is general educational information, not a loan commitment or financial advice. NMLS #1840537.