Subject-To Deal Analysis: The Numbers That Tell You Yes or No

A subject-to deal doesn't eliminate the lender — it buries them. You take title, the seller's mortgage stays in place, and you make payments on a loan you didn't originate. That asymmetry is exactly why sub-2 deals can build a portfolio fast and unwind it equally fast if you skip the analysis.

Here's the complete framework: from the first call with a motivated seller through a signed closing.

What Makes Sub-2 Analysis Different From a Standard Rental Underwrite

Every deal needs a cash flow analysis. But a sub-2 adds two layers that most underwriting templates ignore.

You're inheriting debt you can't renegotiate. The rate, amortization, remaining term, and servicer are fixed at whatever the seller signed years ago. Your job is to model around those fixed inputs, not negotiate them.

You have a due-on-sale exposure. Virtually every conventional mortgage has a due-on-sale clause. If the lender calls the loan, you need an exit that doesn't require refinancing in 30 days into a hostile rate environment. That exit has to be modeled before you close, not improvised after.

Standard rental property underwriting — NOI, cap rate, cash-on-cash, DSCR — is a prerequisite. The sub-2 analysis sits on top of that base layer. If you haven't run through those fundamentals recently, the rental property underwriting walkthrough covers the foundation.

Step 1: Audit the Existing Loan Before You Model Anything

Pull the mortgage statement before you spend time on anything else. This one document tells you whether the deal is worth analyzing further.

Input	Where to Get It
Current principal balance	Mortgage statement
Interest rate	Original note (ask the seller)
Monthly PITI	Statement
Remaining term in months	Statement or amortization schedule
Escrow balance	Statement
Loan type (conventional, FHA, VA)	Note
Servicer name	Statement

Escrow balance: If the seller has $3,800 sitting in escrow at closing, decide how you handle it in the purchase agreement. Many investors take a credit; others let it ride and collect the annual escrow surplus. Either way, account for it — it's real money that belongs to someone.

Hard stops to check immediately:

• Is the loan current? A mortgage 60 days delinquent means you're starting behind and your first priority is catching up, not cash-flowing.
• FHA and VA loans carry more servicing scrutiny than conventional loans. Not impossible to sub-2, but the lender has more standing to act on a due-on-sale trigger.
• Check the remaining term against your hold plan. A 7-year ARM resetting in 14 months, or a balloon payment due in 2 years, is an exit pressure you need to price in from day one.

If the loan is current, conventional, and has no near-term structural events — you're past the first filter. Now you model.

Step 2: Calculate the Equity Cushion

The equity cushion is your margin of safety. It determines whether a forced exit (refinance, sale, deed-in-lieu) leaves you whole or leaves you holding a loss.

Equity cushion = ARV – (existing loan balance + acquisition costs + repair budget)

Walk through a real example:

• ARV: $285,000
• Existing loan balance: $198,000
• Acquisition costs (title, attorney, seller concession): $4,500
• Deferred maintenance: $12,000

Equity cushion = $285,000 – $214,500 = $70,500 (24.7% of ARV)

Most experienced sub-2 operators draw the line at 20% post-repair equity. Below that, you don't have enough cushion to absorb a forced exit at 7% selling costs while still paying off the note and breaking even. Deals with 15% equity look fine on cash flow and terrible when you need out.

This single number kills the majority of deals that cross your desk. Run it in the first five minutes of a new lead and you'll stop wasting time on the ones that can't work.

For a repeatable version of this calculation with adjustable inputs, the subject-to financing calculator was built specifically for this step.

Step 3: Model the Monthly Cash Flow Honestly

This is where sub-2 can look deceptively attractive. You're inheriting a loan originated at 3.5% instead of qualifying for a new DSCR loan at 7.75%. The PITI might be $400–$600/month below current market financing. That spread is real — but model every expense line, not just the payment.

Full monthly model on the example above:

Line Item	Monthly
Gross rent	$2,100
Vacancy (7%)	-$147
Property management (8%)	-$156
Repairs and maintenance (8%)	-$168
Landlord insurance (your policy)	-$85
Inherited PITI	-$1,190
Net cash flow	$354/month

A note on the insurance line: the seller's homeowner policy becomes void the moment title transfers to you. You need your own landlord policy in place at closing, regardless of what remains on the seller's coverage. Budget $75–$110/month for a typical SFR.

The PITI comes directly from the loan audit. Do not recalculate it at current rates — you're inheriting the payment as-is, including escrow.

Cash-on-cash return:

If your all-in acquisition and repair cost is $16,500:

CoC = ($354 × 12) / $16,500 = 25.7%

That's the honest number with no appreciation baked in, no equity capture assumed, no 10% annual growth required. If the deal doesn't cash flow at today's rent against today's expenses, the deal doesn't work.

Step 4: Stress-Test the Due-on-Sale Exposure

The due-on-sale clause gives the lender the right to demand full payoff when title transfers. In practice, servicers are paid to collect payments, not audit county recorder filings. Loans rarely get called while payments are current. But "rarely" is not "never," and you need to know your number.

Model three scenarios before you close:

Base case — loan stays in place for your full intended hold (5–7 years): You collect cash flow, property appreciates at a conservative 3% annually, and you refinance or sell on your timeline. This is how the overwhelming majority of sub-2 deals resolve.

Lender calls the loan at month 18: On the example property, the remaining balance at month 18 is approximately $193,400. A DSCR loan at 75% LTV on a $285,000 ARV gives you $213,750 in proceeds — more than enough to retire the note. Your new payment at 7.75% on $193,400 over 30 years is roughly $1,385/month versus the inherited $1,190. Cash flow drops from $354 to $159/month. Thin, but positive. You survive and hold.

Forced sale — market freezes, you need liquidity: At $193,400 balance and 7% selling costs on a $285,000 sale ($19,950), your net from the sale is $265,050. That covers the loan payoff by $71,650. You walk away with capital intact.

If any of these scenarios produces a number that requires selling at a loss, the deal fails the stress test. Pass on it and find one with more cushion.

Step 5: Map Your Exit Stack Before You Sign

The exit you hope for is a refinance when rates normalize. The exit you must have modeled is a faster-than-planned sale. The exit you should prepare for — especially on properties with strong built-in equity — is selling on terms.

Exit 1: Refinance. When does the balance-to-ARV relationship support a DSCR or conventional refi at positive cash flow? Calculate the month. If it's 24 months at current appreciation projections, make sure your cash reserves can absorb a due-on-sale event before that point.

Exit 2: Sell on a wrap. You transfer the property to a retail buyer via a seller-financed wrap mortgage. You charge them a rate above the underlying rate — say 6.5% on top of the 3.875% note. You collect the spread as passive income while the underlying lender keeps receiving payments. Before structuring this, run your proposed terms through the seller finance deal calculator to confirm the spread justifies the structure.

Exit 3: Assign or wholesale mid-stream. If you structured the acquisition through a land trust or took title in an LLC, there may be an assignment path if your situation changes. This is deal-specific and state-specific — confirm with your real estate attorney at the time of structuring.

Build exit 2 or exit 3 into your analysis even if you expect to use exit 1. Knowing you have options is what lets you hold through rate volatility without panic-selling.

Full Deal Scorecard: Go / No-Go Criteria

Before submitting a letter of intent, every subject-to deal should clear five gates:

Gate	Minimum	Example Deal
Post-repair equity	≥ 20% of ARV	24.7% ✅
Monthly cash flow	> $0 at full expense load	$354/month ✅
Cash-on-cash return	≥ 15%	25.7% ✅
Due-on-sale refi coverage	New loan covers existing balance	$213,750 > $193,400 ✅
Forced-sale net	Covers payoff + selling costs	$265,050 > $193,400 ✅

A deal that passes all five is worth proceeding to contract. A deal that fails any one of them has a structural problem, not a negotiation problem.

Where the Analysis Lives After You Close

Running this framework once on a spreadsheet is straightforward. Running it consistently on 10 or 20 leads in parallel — tracking which ones you passed on and why, sharing analysis with a partner or capital source, maintaining a deal log you can reference when the seller calls back six months later — that's where the friction shows up.

dre1mery.com keeps your deal analysis attached to the deal record throughout the pipeline. When you're ready to bring in a capital partner or hand off to a disposition buyer, share the full deal package directly instead of exporting PDFs from a spreadsheet.

The Two-Minute Filter

After running hundreds of subject-to analyses, the equity cushion check eliminates the majority of deals faster than any other single number. If post-repair equity is below 20% of ARV, the deal almost never survives a stress test. That check takes two minutes with a mortgage statement and a comp — do it first on every new lead and you'll spend the rest of your time on deals that can actually close.

The rest of the framework above is for the deals that pass. When you find one that clears every gate, move fast — sub-2 opportunities exist because sellers are in a situation, and those situations don't wait.

For more on the broader spectrum of creative financing structures and when each one fits, the creative financing strategies breakdown covers subject-to, seller finance, wraps, and novation side by side.