What Monthly Housing Expense Really Means
When lenders calculate your debt-to-income ratio, they need to know your complete monthly housing cost. This goes far beyond just your mortgage payment.
Your monthly housing expense includes your principal and interest payment, property taxes, homeowner's insurance, mortgage insurance (if required), flood insurance (if required), HOA dues, ground rent, special assessments, and any second mortgage or home equity line payments secured by the same property.
Say you're buying a $400,000 home with a $320,000 mortgage. Your principal and interest might be $1,520 per month. But your total housing expense could be $2,100 when you add $350 for property taxes, $125 for homeowner's insurance, $85 for mortgage insurance, and $20 for a small HOA fee.
This total housing expense determines whether you qualify for the loan. Lenders use it to calculate your front-end debt-to-income ratio and your total debt-to-income ratio.
How Lenders Calculate Your Property Taxes
Property tax calculations can trip up borrowers, especially on new purchases. Lenders cannot use the seller's current tax bill if it doesn't reflect what you'll actually pay.
For purchase transactions, lenders must estimate taxes based on your purchase price, not the seller's current assessment. If you're buying a home for $500,000 but the current owner pays taxes on a $300,000 assessment, your lender will calculate taxes on the full $500,000 value.
This rule also applies in states where property transfers trigger automatic reassessments. California buyers often get surprised when their lender calculates taxes without Proposition 13 protections that benefited the previous owner.
For refinances, lenders typically use your current tax bill unless they know a reassessment is coming.
Tax Abatements and Reduced Payments
Tax abatements can provide real savings, but only long-term abatements help you qualify for a larger loan. The abatement must last at least 5 years from your loan's note date.
If your city offers a 10-year tax abatement on new construction, your lender can qualify you using the reduced tax amount for the entire abatement period. But if the abatement only lasts 3 years, your lender must calculate taxes at the full rate.
Some abatements include annual increases. Say you get a 10-year abatement that starts at 50% of full taxes in year one and increases by 10% each year. Your lender must qualify you using the tax amount you'll pay in year 5, not the lower amount in years 1-4.
Required Documentation
Your lender needs specific documents to verify each component of your housing expense:
For property taxes, provide your current tax bill or tax assessor's statement. For purchases, your lender will research local tax rates and apply them to your purchase price.
For insurance, you need a homeowner's insurance quote or declaration page showing annual premiums. The quote must meet your lender's minimum coverage requirements.
For HOA dues, provide the HOA's budget or fee schedule. Your lender needs to see both regular monthly dues and any special assessments.
For subordinate financing, provide loan statements showing monthly payments for any second mortgages, HELOCs, or other liens against the property.
Why These Rules Exist
Fannie Mae requires comprehensive housing expense calculations because housing costs often exceed borrowers' expectations. Many first-time buyers focus only on the principal and interest payment and get shocked by the total monthly cost.
Property tax projections protect both borrowers and lenders from payment shock. If you buy a home and your taxes double after reassessment, you might struggle to make payments even if you qualified based on the seller's old tax bill.
The 5-year rule for tax abatements ensures you can handle the full payment when the abatement expires. Shorter abatements create too much payment shock risk.
Common Complications
Condo and townhome buyers often underestimate HOA fees. Your monthly dues might be $200, but special assessments for roof repairs or pool renovations can add $100-300 per month for several years.
Properties with multiple insurance policies can create confusion. You might need separate flood insurance, earthquake insurance, or umbrella coverage. Each policy's monthly cost counts toward your housing expense.
Second homes and investment properties follow different rules. The entire housing payment becomes a monthly debt obligation rather than housing expense. This distinction affects which debt-to-income ratio limits apply under [[B3-6-02]].
Business debt secured by your home creates special complications. If you have a business loan secured by your residence, the payment might not count as housing expense if it meets specific business debt requirements under [[B3-6-05]].
References
For the official guidelines, see B3-6-03: Monthly Housing Expense for the Subject Property in the Fannie Mae Selling Guide.
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Original Fannie Mae Guideline Text
B3-6-03, Monthly Housing Expense for the Subject Property (12/16/2020)
Monthly Housing Expense
Monthly housing expense is the sum of the following and is referred to as PITIA for the subject property:
principal and interest (P&I);
property, flood, and mortgage insurance premiums (as applicable);
real estate taxes;
ground rent;
special assessments;
any owners’ association dues (including utility charges that are attributable to the common areas, but excluding any utility charges that apply to the individual unit);
any monthly co-op corporation fee (less the pro rata share of the master utility charges for servicing individual units that is attributable to the borrower’s unit);
any subordinate financing payments on mortgages secured by the subject property.
Note: The monthly payment of a subordinate lien associated with a business debt secured by the subject property can be excluded from the monthly housing expense if it meets the requirements of Business Debt in the Borrower’s Name in
Lenders must enter all components of the monthly housing expense on the loan application including subordinate financing P&I, homeowner’s insurance, supplemental property insurance, real estate taxes, mortgage insurance, association/project dues, and other proposed housing expenses.
If the subject mortgage is secured by the borrower's principal residence, the monthly housing expense is based on the qualifying payment required in accordance with B3-6-04, Qualifying Payment Requirements. This amount is the monthly housing expense used to calculate the debt-to-income (DTI) ratio.
If the subject mortgage is secured by a second home or an investment property, the qualifying payment amount is considered one of the borrower's monthly debt obligations when calculating the DTI ratio.
Calculating Monthly Real Estate Tax Payment
The lender must base its calculation of real estate taxes for borrower qualification on no less than the current assessed value. However, the lender must project the real estate taxes if one of the following applies:
For purchase and construction-related transactions, the lender must use a reasonable estimate of the real estate taxes based on the value of the land and the total of all new and existing improvements. This policy also applies to properties in jurisdictions where a transfer of ownership typically results in a reassessment or revaluation of the property and a corresponding increase in the amount of taxes.
There is a tax abatement on the subject property that will last for no less than 5 years from the note date. For example:
for a municipality with a 10-year abatement, the lender may qualify the borrower with the reduced tax amount;
for a municipality with a 10-year abatement and with annual real estate tax increases in years 1 through 10, the lender must qualify the borrower with the annual taxes that will be required at the end of the 5th year after the first mortgage payment date.
The lender has the option to project the real estate taxes if the amount of taxes will be reduced based on federal, state, or local jurisdictional requirements. However, the taxes may not be reduced if an appeal to reduce them is only pending and has not been approved.
