Mortgage Due Diligence Checklist for Note Investors

What Is Mortgage Due Diligence?

Mortgage due diligence is the loan-level check a note buyer runs before funding: confirming the lien exists and where it sits, that the property is worth more than everything ahead of you, that the documents let you enforce the debt, and that nothing in the borrower's situation blocks your exit. Property taxes show why it can't be skipped. In Florida, taxes are "a first lien, superior to all other liens" on the property (Fla. Stat. §197.122), so a delinquent tax bill sits ahead of even a first mortgage.

This checklist follows the deal in three phases: pre-bid screening from the seller's tape and free public data, a post-bid deep dive once your letter of intent is accepted, and pre-closing verification before you wire. It is written for single residential notes, performing or not. The items are the same for a pool; bulk due diligence covers how to scale them.

How Does Due Diligence Differ for Performing and Non-Performing Notes?

The checklist is the same; the weight on each item is not. A performing loan is underwritten on the borrower's payments, and a non-performing loan on the exit.

For the performing side in more depth, see the beginner's guide to due diligence on performing notes.

Phase 1: Pre-Bid Screening

The goal is to cut loans that don't deserve paid research before you submit an indicative bid. Everything here comes from the seller's data tape and free sources, and the pre-bid waterfall orders these checks so the cheapest eliminations come first.

Property Value

You can't price a loan without a defensible value on the collateral.

• Pull more than one estimate. Compare the major listing sites' automated values. When they disagree widely, flag the asset for a BPO in Phase 2.
• Run the address through a lookup tool. Property Lens returns a property's owner, occupancy, AVM valuation, annual tax and last sale in one search.
• Check market activity. An active listing or a recent sale nearby is better evidence than any model.
• Note the property type. Condos, multi-family and vacant land value differently from a single-family home.

Lien Position and Equity Coverage

Lien position sets your whole pricing model. Confirm it from the tape, and if the field is blank, ask the seller rather than assume. For a first lien, divide the unpaid principal balance by the value for LTV. For a junior lien, add the senior balance first for CLTV; if the tape lacks it, the borrower's credit report in Phase 2 can show it. Then subtract delinquent taxes and other liens ahead of you to get the equity actually covering your balance.

Payment History and Borrower Status

• Last payment date and payment history. A loan that paid six months ago is a different asset from one that hasn't paid in years.
• Statute of limitations. Whether a clock is running depends on state law and on what started it: a missed payment, an acceleration or the maturity date. Read the statute for the property's state before you bid.
• Bankruptcy flag. A bankruptcy petition operates as a stay of, among other things, "any act to create, perfect, or enforce any lien against property of the estate" (11 U.S.C. §362(a)). Price the delay or pass.

State Foreclosure Process

If the loan doesn't resolve through a workout, the property's state decides how you foreclose. Florida, for example, requires that "all mortgages shall be foreclosed in equity," which means through the courts (Fla. Stat. §702.01), while other states allow non-judicial foreclosure by a trustee's sale. Our state market pages list each state's foreclosure process, typical timeline and cost, so you can price the slower exits before you bid.

Red Flags That End the Review

• No property address. You can't value collateral you can't locate.
• Missing or zero balance. The core pricing input is absent.
• Blank lien position. You don't know what you are buying.
• An old maturity date. Some states end the lien itself after a set period. In Florida, a mortgage lien terminates "5 years after the date of maturity" when the final maturity is ascertainable from the record, and a recorded extension agreement moves that date (Fla. Stat. §95.281).

Phase 2: The Post-Bid Deep Dive

Your bid is accepted and the due diligence window in your LOI or purchase agreement has started. Order every third-party report that day, because turnaround depends on the county and the vendor, and you need the back half of the window to analyze results and reprice. Counties that haven't put their land records online are where title turnaround runs longest, so order those first.

Title Search and Chain of Title

The title search is the most information-dense document you will order. An O&E report is a narrower search of the current owner's records. ProTitle USA notes that it "does not provide title insurance" and prices one at "roughly $90" on average, "from as little as $55.95 to upwards of $275 depending on the location of the property," with a standard turnaround "within 48 business hours" (ProTitle USA). Our guide to reading an O&E report walks through one line by line.

• Match the owner to the borrower. If they differ, find out how title moved. A deed out of a foreclosure or tax sale may mean your lien was wiped, so identify which lien was foreclosed.
• Trace the assignment chain. Each assignor should match the previous assignee, ending with the seller. If the mortgage names MERS, MERS ServicerID identifies the servicer of a loan registered on the MERS System.
• Total every encumbrance. Tax liens, IRS liens, judgments, HOA liens, lis pendens. An O&E won't show unrecorded city charges, so also check for municipal liens and code violations.
• Watch association priority. In some states part of an HOA lien outranks even a first mortgage (a super-lien). Nevada's statute puts up to 9 months of assessments, plus certain charges and enforcement costs, ahead of a first security interest (NRS §116.3116).
• Read the litigation history. Prior notices of default, sale notices and rescissions tell you what has already been tried.

Collateral File Review

The collateral file is the asset. Ask for images of these documents during due diligence and inspect the originals when they arrive:

• Original promissory note. If the original is gone, read what happens if the promissory note is missing before you price the loan.
• Mortgage or deed of trust, with the county recording stamp.
• Allonge and endorsement chain from originator to seller, matching the assignment chain.
• Modification agreements, the lender's title policy and the origination closing documents, if the seller has them.

Our collateral file audit has the document-by-document checklist.

Property Tax Status

Search the county tax portal by address or parcel number and record the status: current, delinquent or sold. In a tax-certificate state, a sold status means a third party holds a tax certificate with a redemption deadline running; if that deadline is close, the deal may only work if you can redeem at closing. Our property tax due diligence guide covers where to look state by state.

Payment History, Servicing Records and Loss Mitigation

The tape is a summary. Ask the seller for the servicer's payment history and servicing comments, then reconcile the balance, paid-to date, escrow balance and any advances against the tape. The servicing notes often explain the default better than any field.

Ask whether a loss mitigation application is pending. Under Regulation X, a servicer that takes over a loan with a pending application must handle it within the timeframes that applied to the previous servicer, and the borrower's protections carry over (12 CFR §1024.41(k)). The rule applies to loans secured by the borrower's principal residence, and small servicers are exempt from all of it except §1024.41(j) (12 CFR §1024.30).

Borrower Checks: Credit, Bankruptcy and Military Service

• Credit report. A tri-merge report shows the senior trade line, its balance and the pay string. Our credit report guide decodes the string: 1 is current, 2 is 30 days late, 3 is 60, 4 is 90 and 5 is 120 or more. Order a report on any co-borrower too, because a trade line sometimes reports under only one party.
• Bankruptcy. The PACER Case Locator lets you "search a nationwide index of federal court cases" (PACER), covering district, bankruptcy and appellate courts (PACER).
• Military service. For a mortgage taken out before the borrower's military service, a sale or foreclosure during service or within one year after it is not valid without a court order or a waiver agreement (50 U.S.C. §3953). The Department of Defense runs an SCRA database that lenders can use to verify coverage (CFPB).

Property Condition, Occupancy, Insurance and Flood

• Order a BPO. A local agent's broker price opinion, with comparable sales, replaces your desk estimate.
• Check occupancy. Street imagery, utility signs and the credit report address all help. Drive-bys are fine, but don't knock on the door before you own the loan; our performing-note due diligence lesson is blunt about that.
• Confirm hazard insurance. If coverage has lapsed, budget for forced-placed insurance after you board the loan.
• Look up the flood zone on FEMA's Flood Map Service Center.

Senior Lien Status (Junior Liens)

For a second lien, the senior's status matters as much as your own loan's. Confirm the senior is current from the credit report, estimate its payoff (balance plus past-due amount), and subtract it from value to get your real equity coverage. A lis pendens filed by the senior lender means its foreclosure could wipe your position, so check the timeline before you bid.

Phase 3: Pre-Closing Verification

The price is agreed. Before you wire:

• Confirm the seller owns the loan. The recorded assignment chain should end with the seller's entity. A seller can't transfer what it doesn't own.
• Review the draft assignment and allonge. Check entity names, property address, loan details and legal description before they are signed.
• Line up servicing. Your licensed servicer should be under contract and ready to board the loan, and the seller needs your servicing instructions and the address where the originals ship.
• Plan the borrower notices. On a consumer mortgage loan, a buyer that acquires more than one mortgage loan in any twelve-month period must send the borrower a transfer notice on or before the 30th calendar day after the transfer (12 CFR §1026.39). When servicing moves, the old servicer's notice is due at least 15 days before the effective date and the new servicer's within 15 days after (12 CFR §1024.33(b)).
• Read the loan sale agreement. The representations and warranties set your recourse for problems found after closing. Confirm the due diligence contingency and the funding date, and get a legal review on your first purchases. Our guide to the loan purchase agreement goes through it clause by clause.

Mistakes That Cost Note Buyers Money

Paying for reports before the free screen. Eliminate non-starters with the tape and public records first; paid reports are for the loans that survive.

Skipping title on a cheap loan. A loan with no valid lien is worth nothing at any discount, and an O&E averages roughly $90 at ProTitle USA.

Ignoring taxes and association liens. Both can sit ahead of your mortgage. A county tax portal search catches the tax side.

Trusting one valuation. Online estimates can't see condition and can spread widely. Use more than one source and weight the BPO, where an agent has seen the property.

Repricing without evidence. If due diligence finds a lower value or an undisclosed lien, attach the report that supports your new number. Unsupported price cuts can cost you future deal flow.

Leaving the assignment unrecorded. Record it right after closing so the public record shows you as the lienholder.

The Checklist at a Glance

Use the phases as gates. A loan that trips a Phase 1 red flag gets no paid research. A Phase 2 finding either reprices the bid, with the report attached, or ends it. And nothing funds until Phase 3 confirms the seller owns what you are buying.