Your monthly housing expense is the total you spend each month to own and occupy your home: principal and interest on the mortgage, property taxes, homeowners insurance, mortgage insurance if you have it, and any homeowners association dues or assessments. Lenders add those pieces together and compare the total to your gross monthly income to decide how much house you can afford. Utilities, internet, and maintenance are real costs of running a home, but they generally sit outside the figure a lender uses.
What Counts Toward the Total
The core of the number is captured by the acronym PITI: Principal, Interest, Taxes, and Insurance. Principal is the portion of each payment that reduces your loan balance. Interest is what the lender charges to lend you the money. Taxes and insurance are usually collected with your mortgage payment and held in escrow until they come due.
Fannie Mae expands the acronym to PITIA, adding “Assessments” to pick up HOA dues, condo fees, and similar recurring charges tied to the property. That PITIA total is what Fannie Mae treats as your monthly housing expense for underwriting.1Fannie Mae. Monthly Housing Expense for the Subject Property
Property Taxes and Escrow
Local governments assess property tax on the value of your home and bill it once or twice a year, but it counts toward your monthly housing expense every month. Most lenders collect one-twelfth of the estimated annual bill with each mortgage payment and hold the money in an escrow account. Federal rules let a servicer keep a cushion in that account of up to one-sixth of the annual total to absorb changes in the bill.2Consumer Financial Protection Bureau. Section 1024.17 Escrow Accounts
If you pay property taxes directly rather than through escrow, the lender still counts one-twelfth of your annual bill in your housing expense. To estimate the monthly figure yourself, divide the annual tax bill by twelve.
Insurance That Gets Added In
Nearly every mortgage requires you to carry homeowners insurance, and the premium is typically folded into your escrow payment alongside taxes. Two other kinds of insurance can show up depending on your loan and your address.
Private Mortgage Insurance
If your down payment on a conventional loan is less than 20 percent, the lender will require private mortgage insurance, and the premium becomes part of your monthly payment.3Consumer Financial Protection Bureau. What Is Private Mortgage Insurance? PMI protects the lender against default, not you.
Under the Homeowners Protection Act, you can request PMI cancellation in writing once your loan balance reaches 80 percent of the home’s original value, as long as you have a good payment history and are current on the loan. If you do not request it, the lender must automatically terminate PMI when your balance is scheduled to reach 78 percent of the original value.4Office of the Law Revision Counsel. 12 USC 4902 – Termination of Private Mortgage Insurance Good payment history means no payments 60 or more days late in the prior two years and none 30 or more days late in the prior year.5Consumer Financial Protection Bureau. Homeowners Protection Act HPA PMI Cancellation Act Procedures
Flood Insurance
If your property sits in a Special Flood Hazard Area, federal law requires the lender to make you carry flood insurance for the life of the loan. The coverage has to equal at least the outstanding loan balance or the maximum available under the National Flood Insurance Program, whichever is less.6Office of the Law Revision Counsel. 42 USC 4012a – Flood Insurance Purchase and Compliance Requirements Standard homeowners policies do not cover flood damage, so this is a separate premium on top of your regular insurance.
HOA Dues and Special Assessments
If your home sits in a community with a homeowners association or is a condominium, monthly HOA or condo fees are part of your housing expense for as long as you own the property. They cover shared amenities, landscaping, and community maintenance. The fees are set by the association, not by you, and falling behind can lead to a lien on your home and even foreclosure.
Associations can also impose special assessments for large or unexpected repairs that exceed their reserves. A shared-building roof replacement or a required infrastructure upgrade could trigger a one-time charge divided among all owners. Special assessments are binding whether or not you use the amenity being repaired, and the rules for imposing them live in the community’s governing documents.
What Is Not Included
Utilities are a real cost of living in a home, but most conventional lenders leave electricity, gas, water, sewer, trash, and internet out of the housing expense calculation. VA loans handle this differently: they require lenders to calculate “residual income,” meaning the cash you have left after all debts, taxes, and estimated living costs including utilities are subtracted from your income.7eCFR. 38 CFR 36.4340 – Underwriting Standards
Home maintenance is also missing from a lender’s number. A common rule of thumb is to set aside about 1 percent of the home’s value each year for upkeep, or roughly $250 a month on a $300,000 home; older homes may need 2 to 4 percent. Lenders do not factor a maintenance reserve into your ratios, but running short on repair funds can push you into high-interest borrowing that strains the budget more than the original fix would have.
How Lenders Use the Number
Lenders divide your monthly housing expense by your gross monthly income to produce a “front-end” debt-to-income ratio, sometimes called the housing expense ratio. A separate “back-end” ratio measures every monthly debt obligation you carry, housing plus car payments, student loans, credit cards, and other recurring debts, against the same income figure.
Thresholds depend on the loan program:
- FHA loans generally cap the housing expense ratio at 31 percent of gross income and total debt at 43 percent, with higher ratios allowed when documented compensating factors such as significant cash reserves are present.8U.S. Department of Housing and Urban Development. Section F – Borrower Qualifying Ratios
- Conventional loans through Fannie Mae do not use a fixed front-end limit. Total debt-to-income is capped at 50 percent for loans run through automated underwriting and at 36 percent, or 45 percent with strong credit and reserves, for manually underwritten loans.9Fannie Mae. Debt-to-Income Ratios
- A widely used rule of thumb, the 28/36 rule, suggests keeping housing expenses below 28 percent of gross income and total debt below 36 percent. Individual lenders may be more or less flexible.
The components counted in the housing expense ratio are the same across programs: principal, interest, property taxes, homeowners insurance, PMI if applicable, HOA or condo fees, and any active special assessments.
Documents That Show Your Housing Expense
A handful of records lets you build the full monthly figure yourself.
- Your most recent mortgage statement shows principal, interest, the escrow amounts for taxes and insurance, and any PMI charge in one place.
- Your annual property tax bill, available from the local tax assessor, gives the full-year figure; divide by twelve for the monthly share.
- The declarations page of your homeowners (and, if applicable, flood) insurance policy lists the annual premium; again, divide by twelve.
- Your HOA or condo statement shows regular dues and any active special assessment.
Pulling these into a single spreadsheet gives you the same number a lender will build during underwriting, and it lets you see whether the home you have in mind fits inside the ratios your loan program uses.