How a Lender Counts Two Mortgages on a Conventional Loan Purchase

The Quick Read: A lender counts the full payment on the home you still own in your monthly debt alongside the payment on the new one. A documented rule can remove or offset the old payment, such as a sale that closes before the new loan or a qualifying rental offset. Without that proof, both payments stay in.

What Does “Two Mortgages” Actually Mean?

Three different situations get called “two mortgages,” and each one is counted differently. Mixing them up is a common source of confusion.

1. Old home plus new purchase. You keep a financed home and buy another. This is the subject of this article.

2. First lien plus second lien on one purchase. This is a piggyback structure, where two loans fund one property. Both payments count, and both feed the loan-to-value calculation.

3. Two financed properties in general. This is a property-count question, which affects reserves more than the monthly math.

Here the focus is the first one: you will own a financed home after you close on the new one. The old home might be sold later, kept as a rental, or kept as a second home. Each path has its own rule.

How Does the Lender Build the Number?

The lender adds up your monthly obligations and divides by your qualifying income. That result is the debt-to-income ratio, or DTI. It is the share of your monthly income that goes to debt.

Freddie Mac defines DTI as total monthly housing expense plus all monthly liability payments, divided by stable monthly income and/or qualifying assets. Its Guide Section 5401.2 also says every payment included must be documented. Fannie Mae’s version adds installment and other debts that extend beyond ten months.

Each housing payment is counted as PITIA: principal, interest, taxes, insurance and assessments such as HOA dues. For the old home, the lender wants the mortgage statement plus tax, insurance and HOA figures. Not just the loan balance.

Across the wholesale programs Lendmire places files with, the automated underwriting finding governs most files, with a total ratio ceiling of 50%. Manually underwritten loans use the 36% and 45% tiers, along with the reserve and score factors in the Fannie Mae Eligibility Matrix. Treat the matrix as the reference for those tiers. The exact tier a file lands in depends on its details and on lender guidelines.

Picture a buyer whose new payment alone sits comfortably inside the ceiling. Add the old home’s full payment and the same buyer may sit well above it. Nothing about the buyer changed. The counting did.

When the Old Home Hasn’t Sold Yet

If the sale will not close, with title transferred, before your new loan closes, the lender must use both the current PITIA and the proposed PITIA. That is the rule in Fannie Mae Selling Guide B3-6-06.

A signed sale contract is not enough on its own. A buyer can walk, financing can fall through, and a contingency can reopen. The lender wants evidence that the transfer is done, such as a closing disclosure or title-transfer document, before the old payment leaves your ratio.

Here is the catch. Timing is the whole game. A sale that closes a week after your purchase leaves both payments in the calculation. A sale that closes the day before can remove one. Anyone selling and buying at the same time should ask the loan officer exactly which document the lender needs and when.

Can You Keep the Old Home as a Rental?

Sometimes, but the rental rules are narrow. When your current residence becomes a rental after you move, agencies call it a departing residence. Rent from it can help, but only in limited ways.

Under Fannie Mae’s rental policy for a departing residence (B3-3.8-05), the steps run like this:

1. The lender documents your current housing payment.

2. Rent is documented with a full appraisal showing market rents, an appraiser’s rent schedule, or a market tool such as MLS-based comparables. At least three comparable rentals are needed.

3. The lender multiplies gross rent by 75%.

4. The lender subtracts the old home’s PITIA. The result is adjusted net rental income.

5. Lease agreements are not permitted for a departing residence.

6. A multi-unit departing residence needs your most recent individual tax return to support rent from tenant-occupied units.

If the result is positive, it can only offset that property’s payment. It is not added to your qualifying income. If the result is negative, the shortfall goes into your DTI.

Confirm the reserve requirement with your loan officer before counting on it. Check which version of the guidelines applies to your application date. Leverage, reserves, and pricing vary by lender and program; the final terms follow the full file review.

Freddie Mac differs. Its Guide 5306.1 still allows a current, fully executed lease on a converted primary residence, and counts 75% of gross monthly rent. You must currently own a primary residence or have a documented rental housing payment to use the income. Using the net rental income in full takes at least one year of documented property-management experience. Without it, rent can only offset that property’s payment.

So the same departing home can be treated differently depending on which agency buys the loan. A broker who can compare lenders may find a better fit. No guarantee, though. Each lender adds its own overlays.

Second Home: The Old Payment Stays

If the old home becomes a second home, the full PITIA counts as debt. Rental income from a second home generally cannot be used. Skip the rental offset idea here. It does not apply.

Occupancy also changes the leverage on the new loan. The wholesale conventional programs allow up to 97% LTV on a one-unit principal residence for a first-time buyer, and 95% otherwise. Second homes top out at 90%, subject to lender guidelines.

Other Situations That Change the Count

The general rule bends in a few named cases.

Assumed mortgage. If you assume a mortgage, the lender needs the transfer evidence and the assumption agreement. If 12 months of timely payments can be documented, the contingent liability need not be counted. If not, the payment counts.

Bridge or swing loan. Fannie Mae treats a bridge loan as a contingent liability that must be considered in DTI. Freddie Mac’s evaluation of monthly obligations FAQ says a property pending sale, including one with a bridge loan, can be excluded from DTI under certain conditions. The conditions matter, so have your loan officer walk you through them.

Debts someone else pays. A non-mortgage debt that another person actually pays can be excluded. Mortgage debts carry conditions, including no delinquencies in the most recent 12 months.

A rental you just bought. Fannie Mae has a standardized treatment for recently purchased investment properties. Leases are not permitted for those.

Short-term rentals. These have separate rules in the Selling Guide.

Loans in an LLC’s name. Fannie Mae counts financed properties where you are personally obligated on the mortgage. Its own example leaves out LLC-financed investment properties because the borrower is not personally obligated. Property count follows personal obligation, not the number of liens.

Does Property Count Matter?

Property count affects reserves more than monthly math. Extra reserve requirements apply to second-home and investment purchases based on the number of financed properties. A principal-residence purchase faces fewer property-count limits than a second home or investment purchase, which is why occupancy matters so much. HomeReady is exempt from those extra reserve requirements. Some lenders also set higher credit-score floors as the count rises, and the specifics vary by lender.

Funding the Down Payment Without Making It Worse

A HELOC or bridge loan can supply cash, but it can add a payment. A drawn HELOC balance is a liability. A new debt opened right before closing also gets counted, because the final application must reflect every debt verified, disclosed or found during the process.

The practical order is to talk with a loan officer before you open anything new. Opening credit first and asking later is a common way to turn a workable file into a stuck one.

Common Mistakes

• “A signed lease lets my rent count.” Not for a departing residence under Fannie Mae’s current policy.
• “Only the larger mortgage counts.” Both count.
• “Rent adds to my income.” It only offsets the old home’s payment.
• “The CFPB caps DTI at 43%.” The old 43% cap is gone from the general qualified-mortgage definition. Under federal ability-to-repay rules, the CFPB compliance guide says the lender must consider your DTI or residual income, plus current debts such as existing mortgages not paid off at closing.
• “Property limits depend on the number of mortgages.” They depend on personal obligation.

Timeline: What the Lender Checks and When

At application, the lender sorts the old home into one of four outcomes: sold before closing, pending sale, rental, or second home. At underwriting, it documents the old payment and whatever supports an exclusion or offset. At closing, it confirms nothing changed.

If facts shift mid-file, such as a sale falling through or a contingency reopening, the old payment can return to the ratio. Tell your loan officer right away.

Documents to Gather

• Mortgage statement for the old home
• Current tax bill, insurance declaration and HOA statement
• Sale contract and, when available, the closing disclosure or title-transfer document
• Rent evidence if you plan an offset: an appraiser’s rent schedule or comparable rentals
• Your most recent individual tax return if the old home has multiple units
• Statements for any HELOC or bridge loan

What Your Decision Looks Like

Compare three paths: sell first, buy first with a documented sale, or keep the old home. Selling first gives the cleanest ratio. Keeping it makes the most sense when the rental offset and your reserves hold up. It is a real tradeoff, and the numbers decide it.

Mortgage insurance matters too. On a conventional loan it is required above 80% LTV, can be requested for cancellation at 80% of the original value with good payment history, and must end automatically at 78%. That is a separate cost lever from the old payment. Lendmire’s conventional loan programs work through these tradeoffs with buyers every week, and the piece How a Conventional Lender Counts Rent for a First-Time Buyer covers a related counting question.

Tax treatment can depend on your situation; borrowers should speak with a qualified tax professional before relying on any deduction or credit.

Key Terms Defined

DTI (debt-to-income ratio): Your total monthly debt payments divided by your qualifying monthly income.

PITIA: Principal, interest, taxes, insurance and assessments such as HOA dues, the full monthly cost of a home.

Departing residence: The home you live in now and plan to leave, often to rent out, when you buy the next one.

Contingent liability: A debt you may owe, such as a bridge loan or assumed mortgage, that a lender must consider.

Reserves: Verified savings left after closing, counted in months of housing payments.

Everything here is subject to lender guidelines and full file review. Nothing is a commitment to lend.

If you are buying a home and want to see whether a conventional loan fits your file, Lendmire can help you compare the options and what each one asks of the file.

For your own numbers, request a scenario review with Lendmire.

About Lendmire

As a mortgage broker (NMLS# 2371349), Lendmire helps homeowners and home buyers in 16 states with FHA, VA, conventional and jumbo purchase and refinance loans arranged through wholesale lenders. Lendmire is never the lender; program terms are set by the lender and the agency guidelines. Scotsman Guide named Lendmire a Top Mortgage Workplace in both 2025 and 2026.

References

1. Freddie Mac Guide 5401.2

2. Fannie Mae Eligibility Matrix

3. Fannie Mae Selling Guide B3-6-06

4. Fannie Mae Selling Guide B3-3.8-05

5. Freddie Mac Guide 5306.1

6. Freddie Mac Evaluation of Monthly Obligations FAQ

7. CFPB ATR/QM Small Entity Compliance Guide