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Subject-To Calculator

Analyze a subject-to real estate deal. Take over seller's existing mortgage without assuming it. Calculate cash flow, equity, and returns.

📍 Property Address (optional)
✓ Saved
InputsShared
Existing Mortgage
Current Loan Balance?
$
Existing Monthly Payment?
$
Existing Interest Rate?
%
Purchase Details
Property Market Value?
$
Cash to Seller?
$
Closing Costs
$
Arrears/Back Payments?
$
Rental Income & Expenses
Monthly Rent
$
Vacancy %
%
Property Tax/mo
$
Insurance/mo
$
Maintenance %
%
Management Fee %
%
Pro Forma — After Renovation
Pro Forma Rent
$
PF Vacancy %
%
As-Is TodayCurrent
Enter values to see results
Monthly Cash Flow
—
after subto payment
Instant Equity
—
value − balance
Cash-on-Cash
—
on cash invested
Total Cash In
—
at closing
SubTo Deal Structure
Property Value—
Existing Loan Balance—
Instant Equity—
Cash to Seller—
Closing Costs—
Arrears—
Total Cash Invested—
Monthly Cash Flow
Gross Rent—
Vacancy—
SubTo Mortgage Payment—
Operating Expenses—
Net Cash Flow—
Pro FormaAfter plan
Enter values to see results
Pro Forma Cash Flow
—
post-reno rent
Cash-on-Cash
—
on cash invested
Cap Rate
—
on market value
DSCR
—
debt coverage
Pro Forma Cash Flow
Pro Forma Rent—
Vacancy—
SubTo Payment—
Operating Expenses—
Net Cash Flow—
Rate Advantage Analysis
Rate Saved vs Market—
Payment Savings vs Market Refi—
Annual Payment Advantage—

Enter the seller's existing mortgage details — this is the loan you'll take over 'subject to' the existing deed of trust. Enter your cash to close and rental income to see cash flow, equity capture, and cash-on-cash return. The Pro Forma column shows post-renovation returns.

Subject-To (SubTo) is a creative real estate investing strategy where the buyer takes title to a property 'subject to' the existing mortgage, meaning the seller's mortgage stays in place and the buyer makes the payments. This allows investors to acquire properties without new financing, often at below-market interest rates. The main risk is the due-on-sale clause — lenders have the right to call the loan due upon transfer of title, though this is rarely enforced when payments are current.