If you own rental properties—or you're planning to buy your first one—there are some important mortgage changes happening right now that are worth knowing about.
Fannie Mae and Freddie Mac continue to update how rental income, appraisals and investment properties are evaluated. At the same time, the Non-QM market continues to expand DSCR options that allow investors to qualify primarily using the property's cash flow rather than their personal income.
Some of these changes make financing easier. Others could make certain investor strategies more complicated.
Here are the biggest things I think real estate investors should be watching heading into the end of 2026 and 2027.
One of the biggest changes is Fannie Mae's updated rental-income guidelines.
The new rules were released September 2, 2026. Lenders can begin using them immediately, and they become mandatory by November 1, 2026.
The changes are especially important for investors who are actively acquiring multiple properties.
Under the updated guidelines, Fannie Mae has created specific rules for investment properties purchased within 45 days of the mortgage application on another property.
Why does that matter?
Imagine an investor buys Rental Property #1 and then finds another opportunity three weeks later.
They apply for financing on Rental Property #2 and want to use the expected rental income from Property #1 to qualify.
That rental income is no longer necessarily treated the same way as rental income from a property they've owned for years.
For an investment property purchased within 45 days of the new loan application, Fannie Mae requires the borrower to have a documented current housing payment in order to use rental income from that recently acquired property.
The lender can generally determine market rent using an appraisal with market rents or, when an appraisal isn't available, a Single-Family Comparable Rent Schedule for a one-unit property. For multi-unit properties, qualifying market-rent analysis may include market-analysis tools with at least three comparable rental properties.
Here's another important part:
A lease cannot be used to establish the qualifying rent for an investment property purchased within that 45-day window.
Instead, qualifying rent is generally calculated at 75% of the documented gross market rent, and the property's PITIA is then subtracted.
If the result is positive, the income can generally only be used to offset that property's housing expense. If the result is negative, the loss must be included in the borrower's debt-to-income ratio.
For investors rapidly building a portfolio, this is something that needs to be planned before making the next offer.
The bigger takeaway from the new rental-income rules isn't simply "Fannie Mae made things harder."
It's that the order and timing of your purchases matter more than ever.
An investor who buys three properties over 18 months can potentially present a very different underwriting profile from an investor trying to buy three properties within 60 days.
The investor might have plenty of cash flow on paper, but underwriting still has to determine exactly how much of that rental income is eligible to offset the mortgages.
This is why investors should talk to their mortgage broker before—not after—putting the next property under contract.
Sometimes waiting a few weeks, changing the financing structure, documenting additional reserves, or using a DSCR loan instead of conventional financing can completely change the deal.
Investors also need to remember that conventional underwriting generally doesn't simply give you dollar-for-dollar credit for expected rent.
If market rent is $2,500 per month, for example:
$2,500 × 75% = $1,875
That adjustment accounts for expenses such as vacancy, maintenance and other costs.
From there, underwriting determines how that rental income or loss affects the borrower's overall qualification based on the applicable Fannie Mae or Freddie Mac guidelines.
This is one reason a property can have positive cash flow from an investor's perspective but still create a qualifying loss for conventional mortgage underwriting.
Cash to close isn't the only cash number investors need to think about.
Reserves matter too.
For a Fannie Mae investment-property transaction run through Desktop Underwriter, six months of reserves are generally required for the subject investment property.
Additional reserve requirements can apply when the borrower owns multiple financed properties.
Fannie Mae's reserve calculation for other financed properties can be based on a percentage of the aggregate unpaid mortgage and HELOC balances:
That can become significant very quickly.
An investor may have enough money for the down payment and closing costs but still fail to qualify because moving the money into the transaction leaves them short on required reserves.
This is something we calculate upfront when working with investors.
This is probably the biggest misconception I see with investment-property financing.
Investors often assume:
"If I qualify for conventional financing, conventional must be the best option."
Not necessarily.
Conventional financing can offer excellent rates, but the borrower typically still has to qualify using personal income, employment, tax returns, debts and overall DTI.
For someone with one rental property and a straightforward W-2 income, that may work perfectly.
But things can become more complicated when someone owns five, eight or ten properties—or is self-employed, aggressively reinvesting money into their business, or purchasing properties quickly.
That's where Non-QM financing becomes extremely useful.
DSCR stands for Debt Service Coverage Ratio.
Instead of primarily asking:
"How much money does the borrower personally make?"
the lender is much more focused on:
"Does this investment property's rental income support its mortgage payment?"
For example, if qualifying monthly rent is $3,000 and the applicable housing expense is $2,500:
$3,000 ÷ $2,500 = 1.20 DSCR
The property produces 20% more qualifying rent than the applicable monthly housing expense.
Depending on the lender and program, DSCR loans may allow investors to qualify without traditional employment-income calculations, W-2s or personal tax returns.
And the Non-QM market continues to evolve.
During 2026 we've seen lenders expand or adjust DSCR guidelines involving reserve requirements, first-time investors, cash-out seasoning, short-term rentals and prepayment penalties.
For example, some programs have reduced DSCR cash-out ownership seasoning from 12 months to six months, while other programs have loosened requirements for first-time investors.
That doesn't mean every DSCR lender follows the same rules.
They absolutely do not.
One lender might decline a scenario that another lender will approve.
That's one of the biggest advantages of working with an independent mortgage broker on investment properties.
Airbnb and VRBO properties deserve special attention.
More Non-QM lenders are developing specific rules for short-term rental income rather than treating every property exactly like a traditional 12-month rental.
Depending on the lender, acceptable income documentation may include things such as historical short-term-rental revenue, third-party rental reports, market-rent analysis or other documentation.
But the requirements vary considerably.
An investor buying a vacation rental shouldn't assume that projected Airbnb revenue will automatically be accepted.
The financing strategy should be discussed before the property is under contract.
This is something I always want investors to understand before choosing a DSCR loan.
Many business-purpose DSCR loans can include a prepayment penalty, where permitted by state law.
Depending on the program, that penalty could apply for one, three or even five years.
That becomes extremely important if your strategy is:
Buy → Renovate → Increase Rent → Refinance.
A loan with a slightly lower rate but a five-year prepayment penalty could ultimately cost considerably more than another loan with a higher rate and a shorter penalty.
The lowest interest rate isn't always the cheapest loan.
You have to look at the entire investment strategy.
Another major change coming this fall isn't limited to investors, but investment properties will absolutely be affected.
Fannie Mae and Freddie Mac are transitioning to Uniform Appraisal Dataset (UAD) 3.6 and redesigned appraisal reporting.
The transition becomes mandatory for applicable appraisal reports on loans sold to Fannie Mae or Freddie Mac beginning November 2, 2026.
The new appraisal framework provides significantly more structured property data than the old appraisal forms.
For investors—especially buyers of 2–4 unit properties, unique properties, heavily renovated properties and properties where rental income is critical—the quality and accuracy of appraisal data is going to become increasingly important.
The mortgage market isn't shutting investors out.
If anything, investors have more financing options than ever before.
But financing is becoming increasingly specialized.
A borrower purchasing their first duplex might be best served with a conventional loan.
Someone buying their sixth rental could potentially be better suited for DSCR.
A self-employed investor may have conventional, bank-statement and DSCR options.
Someone buying an Airbnb might need a lender specifically comfortable with short-term-rental income.
And an investor buying several properties within a short period of time now needs to pay particularly close attention to Fannie Mae's new rental-income rules.
There isn't one "best investment-property mortgage."
There's a best mortgage for the property, borrower and investment strategy.
The biggest mistake an investor can make is finding the property first and figuring out the financing second.
Before making the next offer, I like to look at the investor's entire picture:
Current properties, mortgage balances, rental income, available reserves, personal income, credit, purchase timeline and long-term strategy.
Then we can compare conventional financing against DSCR and other Non-QM options and determine which structure actually makes sense.
At Barren Hill Mortgage, that's one of the biggest advantages of working with a mortgage broker.
We're not limited to one bank or one investment-property program.
More Options. Better Deals. Smarter Financing.
If you're considering buying, refinancing or pulling cash out of an investment property, reach out before you make your next move. We can look at the numbers and determine which financing strategy makes the most sense for your portfolio.
Mortgage guidelines and Non-QM programs vary by lender and are subject to change. This article is for educational purposes and is not a commitment to lend.
Contact Barren Hill Mortgage to review your options and get pre-approved.
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