How Lenders Count Rental Income: The 75% Rule and Your DTI

Lenders do not necessarily count every dollar of a rental's lease income when qualifying you for a mortgage. Under a specified Fannie Mae purchase scenario, $2,400 of supported monthly rent becomes $1,800 after a 25% allowance. Subtract a $1,650 property housing payment and the result is $150. Whether that $150 increases qualifying income depends on the applicable rules and documented experience.

This guide uses hypothetical numbers to explain the calculation and the questions to bring to a lender. It focuses on Fannie Mae conventional lending; it is not a universal rule for Freddie Mac, FHA, VA, portfolio or business-purpose loans. A property's actual operating cash flow is a separate calculation, even when both worksheets start with the same lease.

First confirm which version of the rules applies

Fannie Mae's September 2, 2026 announcement reorganized its rental-income guidance and changed several requirements. Lenders may implement the changes early and must apply them to loans with application dates on or after December 1, 2026. The discussion below describes the revised guidance reviewed September 27, 2026. For an earlier application, ask which policy version the lender has adopted.

Put that answer at the top of your financing worksheet. Also identify whether the rental is the property securing the new loan, another rental you already own, or the home you are leaving. Those categories have different documentation paths. A screenshot saying lenders use 75% of rent does not establish that your lease or your transaction is eligible for that calculation.

Record the loan program and occupancy classification before requesting the lender's analysis. A house you will occupy and a house rented entirely to others can produce different underwriting treatment. Give the lender the intended facts; do not change the description merely to obtain a more favorable answer. Use the DSCR-versus-conventional comparison when choosing which financing structure to investigate.

A purchase example using 75% of supported rent

Under the revised subject-property guidance, the purchase calculation applies 75% to supported gross rent and then subtracts PITIA. Purchase documentation includes the applicable rent appraisal form and transferred leases where relevant. Positive income generally requires at least 12 months of rental property management experience to count beyond offsetting PITIA; negative results enter the DTI calculation. Eligibility and documentation conditions still apply.

PITIA is shorthand for the property's qualifying housing expense, including principal, interest, taxes, insurance and applicable association charges. Fannie Mae's housing-expense definition provides the full list. Use the lender's complete payment, including applicable mortgage insurance or other required charges, rather than copying principal and interest alone.

The arithmetic is $2,400 times 0.75 minus $1,650. The lender decides whether the positive amount can increase qualifying income or only offset the property payment. For this example, compare both outcomes before making a purchase commitment. A favorable result in the more permissive case is insufficient if the required experience is missing from the file.

Now reduce supported rent to $2,000 while keeping PITIA at $1,650. Seventy-five percent is $1,500, producing a $150 monthly shortfall. The property might still look attractive under an investor's different operating assumptions, but that does not remove the shortfall from the lender's worksheet. Changing the asking rent on a listing is not documentation of a higher qualifying amount.

See exactly how the rental changes DTI

Use a borrower with $8,000 of accepted monthly qualifying income before this rental and $3,000 of other monthly obligations, including the borrower's housing payment. The $3,000 excludes this rental's PITIA. All figures are fictional, and the examples assume the income and debts otherwise satisfy the lender's requirements.

For the first row, add the full $1,650 property obligation because no offset was accepted. In the positive-income row, the property payment has already been subtracted when calculating the $150. Adding it again would count the same obligation twice. Likewise, adding the full $2,400 lease to income would ignore the allowance and the property payment.

These are arithmetic illustrations of alternative treatments, not approval predictions or published maximum DTI limits. Credit, reserves, other properties, automated underwriting findings and lender requirements remain part of the decision. Ask the lender to show which numerator and denominator it is using so a difference in the result can be traced to an input or rule.

Use the rent-roll verification guide to organize the lease and collection evidence. It serves a different role from an appraisal's market-rent support. A signed lease tells you the contractual obligation; collection records help show what was paid; the lender determines which evidence supports qualification.

An existing rental may require a Schedule E calculation

The revised non-subject-property guidance distinguishes rentals reported on Schedule E from eligible cases using lease income. Its cash-flow method can add back depreciation, interest, taxes, insurance and HOA expenses before subtracting current PITIA. Certain documented nonrecurring expenses may also be considered. The appropriate averaging period depends on the property history and applicable conditions.

Here is a simplified full-year example of that reconciliation. Assume the lender has accepted a 12-month history, all listed expenses were actually deducted in the reported net amount, and no ownership allocation or other adjustment is needed. This is a worksheet illustration, not a substitute for the lender's approved calculation form.

Do not add back principal payments as if they were an interest expense on Schedule E. Do not add an expense twice because it appears in both your bookkeeping export and tax return. Trace each adjustment to the filed record and the lender's stated method. A $100 negative result is more useful when its calculation can be reproduced than a positive estimate built from undocumented add-backs.

If a property was in service for part of the year, a full-year divisor can distort the result. Conversely, dividing by only the best occupied months can overstate it. Give the lender the acquisition date, rental-ready date, lease dates and renovation records and ask which period applies. Do not choose the divisor solely because it produces the highest income.

The home you leave has its own revised rule

The revised departing-residence guidance uses market-supported rent and does not permit a lease agreement to establish rent for the vacated residence. Positive adjusted income can offset that property's PITIA only; a negative amount enters DTI. It also requires six months of PITIA reserves for the vacated property when the borrower has less than 12 months of management experience, in addition to applicable multiple-property reserves.

As an illustration, supported rent of $2,800 becomes $2,100 after the allowance. If the departing home's PITIA is $2,000, the positive $100 offsets the payment without adding $100 to the income denominator under this revised rule. Six months of that PITIA equals $12,000. That calculation alone does not establish the total reserves the lender will require.

This is where the implementation date matters especially. Confirm early adoption for an application before December 1, 2026 instead of treating a newly posted rule as already mandatory for every lender. A lease still matters for the actual rental business even when it is not the permitted qualifying-rent document under this specific guidance. The financing rule does not replace the landlord's lease or collection responsibilities.

Keep the lender worksheet separate from the operating forecast

Return to the $2,400 rental. An investor might independently model 5% vacancy, 8% management, $150 maintenance and $150 replacement reserves. With $1,650 of combined housing costs, that produces $138 monthly cash flow: $2,400 minus $120 minus $192 minus $150 minus $150 minus $1,650. It differs from the lender's $150 because the two models use different purposes and inputs.

Neither result validates the other. The lender's allowance is not a detailed repair budget, and your replacement reserve is not automatically an underwriting add-back. Keep the rental pro forma and vacancy analysis alongside the financing calculation so each assumption is visible.

Run the property's expenses and financing in the single-family rental calculator. Save that operating scenario to your account, with the loan program and lender-confirmed payment recorded in your own purchase notes. RentalCalcs does not approve the loan or promise a lender DTI output. The DSCR guide explains another financing measure that should also remain distinct from personal DTI.

Prepare a file the underwriter can reconcile

Organize documents by property rather than placing every lease in one undifferentiated folder. For each address, retain the loan statement, tax and insurance records, association charges, ownership dates, tax-return pages, current leases and requested payment evidence. Include any market-rent document the lender requests and identify discrepancies before the underwriter finds them.

Write down three unanswered items: the eligible rent amount, whether a surplus counts as income or only offsets a payment, and the required reserve amount. Ask for the applicable policy section and implementation date where the answer depends on the 2026 transition. Then update the financing scenario using the confirmed treatment.

Recheck the file when the purchase price, rate, insurance quote or lease changes. A $100 increase in PITIA moves the $150 surplus in the first example to $50 without changing the lease. An offer decision based on the earlier surplus needs the revised number. The aim is a reproducible qualification estimate and a separately sound property analysis before relying on either one.