Demystifying PITI: Principal, Interest, Taxes & Insurance in 2026

The Four Pillars of PITI

Mortgage lenders qualify borrowers based on their complete housing expense ratio, known as PITI:

1. Principal: The portion of payment paying down the loan balance.
2. Interest: The cost of borrowing charged by the lender, amortized monthly.
3. Taxes: County and municipal property taxes escrowed each month.
4. Insurance: Hazard homeowners insurance plus Private Mortgage Insurance (PMI) if down payment is below 20%.

Detailed Example: $450,000 Home Purchase

• Purchase Price: $450,000
• Down Payment (10%): $45,000 (Loan Balance: $405,000)
• Interest Rate: 6.25% (30-year fixed)
• Local Property Tax Rate: 1.35% annually ($6,075 / year = $506.25 / month)
• Homeowners Hazard Insurance: $1,500 / year ($125 / month)
• PMI (approx. 0.6% annually): $202.50 / month

Monthly PITI Breakdown:

• Principal & Interest: $2,494
• Property Taxes: $506
• Hazard Insurance: $125
• PMI: $203
• Total Monthly Housing Obligation: $3,328

The 28/36 Qualifying Rule

Conventional conforming guidelines (Fannie Mae / Freddie Mac) evaluate two key metrics:

• Front-End DTI (Housing Ratio): Total PITI should ideally stay under 28% of gross monthly income ($3,328 / 0.28 = ~$11,885/mo or $142,600 annual income).
• Back-End DTI (Total Debt Ratio): PITI plus student loans, auto financing, and credit card minimum payments must not exceed 36% to 43% of gross income.