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Subject-To Calculator

DealCalc helps you see what a subject-to structure actually does to the deal: cash to seller, takeover costs, payment spread, and whether the exit plan survives.

Primary output Cash to seller

Primary output Monthly spread

Sample scenario

See whether the takeover structure still leaves margin.

Example numbers only. Verify mortgage terms, arrears, seller cash needs, and exit assumptions on every subject-to deal.

Example inputs

Existing payment$1,428/mo
Monthly rent$2,450
Cash to seller$14,000
Repairs + cleanup$18,500
Exit timeline18 months

Example outputs

Monthly spread $612

Cash required $34,900

Equity capture $41,000

Verdict Works with discipline

How the math works

Core formulas investors care about

Monthly spreadIncome - payment - operating drag
Cash requiredCash to seller + cleanup + closing costs
Equity captureMarket value - takeover basis

Why it matters

What to verify before you trust the answer

Subject-to deals are easy to oversimplify. The structure only works if the payment spread, condition, and exit plan all survive real-world friction.

What DealCalc surfaces

Takeover structure and upfront cash needs
Existing payment vs projected income spread
Hold viability and exit optionality
Cleaner partner-facing visibility than a notes app

Why investors use it

Subject-to deals are easy to oversimplify. The structure sounds attractive until the payment, repairs, and real carry obligations get stacked together.

Common mistakes

Underestimating arrears, reinstatement costs, insurance changes, and seller-risk obligations.
Ignoring due-on-sale, lender communication, servicing, and documentation risk.
Modeling payment spread without checking the legal and operational structure.

Subject-to deals require careful legal, insurance, lender, and seller-risk review. DealCalc helps model the numbers, but users should verify the structure with qualified professionals.

Common questions

What should a subject-to calculator show?

It should show cash to seller, takeover costs, the spread between the existing payment and expected income, and whether the exit plan still works.

Why is subject-to math easy to oversimplify?

Because the structure sounds attractive until the existing payment, repairs, taxes, insurance, and real carry obligations are stacked together.

Can subject-to still work as a rental or resale?

Yes, but only if the payment spread, upfront cash, and exit strategy still leave enough margin once real expenses are included.

Download DealCalc

Model the structure before you present terms to a seller.

Download DealCalc to run the full mobile workflow: saved deals, cleaner reports, and investor-ready analysis in one place.

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