Finance & Investment·Qualifying Ratios

Qualifying Ratios and Mortgage Underwriting

Why Texas Property Taxes Change Everything

Standard mortgage qualifying ratios are the same nationwide, but Texas's property tax burden is among the highest in the nation — typically 2.0%–2.8% of assessed value annually, compared to California's Proposition 13-capped rates near 1.0%–1.2%. This single factor dramatically affects how much home a Texas buyer can qualify for and is a critical distinction for Texas broker exam purposes.

Concrete example:

| Factor | Texas (Plano, TX) | California (San Jose, CA) | |---|---|---| | Home price | $500,000 | $500,000 | | Annual property tax rate | 2.5% | 1.1% | | Annual property taxes | $12,500 | $5,500 | | Monthly tax component | $1,042 | $458 | | Monthly PITI impact | Much higher | Much lower |

Same price, same loan, same insurance — but the Texas buyer's PITI is ~$584/month more due to property taxes alone. This can push a Texas buyer over qualifying ratios that a California buyer at the same price point would easily clear.

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The Two Key Qualifying Ratios

Housing Ratio (Front-End DTI)

Formula: Monthly PITI ÷ Gross Monthly Income

  • PITI = Principal + Interest + (Property) Taxes + Insurance (hazard insurance + HOA if applicable)
  • Benchmark: 28% for conventional; FHA allows up to 31% (sometimes higher with compensating factors)
  • Texas example:

  • Gross monthly income: $8,500
  • 28% housing ratio threshold: $8,500 × 0.28 = $2,380 max PITI
  • $400,000 home at 7% rate → P&I ≈ $2,661/mo
  • Texas taxes at 2.5% → $10,000/yr → $833/mo
  • Insurance → $150/mo
  • Total PITI → $3,644/mo
  • Housing ratio → $3,644 ÷ $8,500 = 42.9% — significantly over the 28% guideline
  • This illustrates why Texas buyers often need higher incomes or larger down payments compared to same-price buyers in lower-tax states.

    Total DTI (Back-End Ratio)

    Formula: (Monthly PITI + All recurring monthly debt) ÷ Gross Monthly Income

  • Benchmark: 36% conventional guideline; 43% standard maximum; FHA up to 50–56.9% with compensating factors; VA up to 41% guideline (higher with residual income test)
  • Recurring debts include: auto loans, student loans, minimum credit card payments, personal loans, alimony/child support
  • Why DTI matters in Texas: A Texas buyer's high monthly property tax burden directly increases their front-end ratio and consumes back-end DTI capacity, leaving less room for other debts.

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    Income Documentation

    W-2 Employees

  • 2 years of W-2s
  • Most recent 30 days of pay stubs
  • If hourly: lenders average income over 2 years to account for fluctuations
  • Self-Employed Borrowers

  • 2 years of signed federal tax returns (personal + business)
  • Year-to-date profit and loss statement
  • Lenders typically use the average of 2 years' net income (after write-offs)
  • Write-offs that reduce taxes also reduce qualifying income — a common challenge for Texas small business owners
  • Commission-Based Income

  • 2 years of documented commission history
  • Averaged over the 2-year period
  • Base salary is counted at 100%; commission averaged at 24-month average
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    Credit Score Tiers and Rate Impact

    | FICO Score Range | Loan Type Eligibility | Approximate Rate Premium | |---|---|---| | 760–850 | All conventional; best pricing | Best available market rate | | 720–759 | Conventional; minor rate adjustment | +0.25%–0.50% | | 680–719 | Conventional with some LTV restrictions | +0.50%–1.00% | | 640–679 | FHA/VA preferred; conventional costly | +1.00%–2.00% | | 580–639 | FHA (3.5% down); limited conventional | High rate premium | | 500–579 | FHA only (10% down required) | Very high cost | | Below 500 | No standard loan products | Hard money only |

    Rate impact is cumulative with LTV: a low credit score combined with high LTV creates significant pricing adjustments. Texas investors (who may carry multiple mortgages) are especially sensitive to these adjustments.

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    Worked Texas Qualifying Example

    Scenario: Maria wants to buy a $380,000 home in suburban Houston (tax rate 2.6%). She earns $95,000/year gross ($7,917/mo). She has a $450/mo car payment and $200/mo student loan minimum.

    Step 1: Estimate monthly PITI

  • Loan: $342,000 (10% down) at 6.75% for 30 years → P&I ≈ $2,218
  • Property taxes: $380,000 × 2.6% = $9,880/yr → $823/mo
  • Homeowners insurance: $160/mo
  • PMI (conventional, <20% down): ~$95/mo (at 0.33% annually)
  • Total PITI: $3,296/mo
  • Step 2: Housing ratio $3,296 ÷ $7,917 = 41.6% — above 28% guideline; would likely require FHA or strong compensating factors

    Step 3: Total DTI ($3,296 + $450 + $200) ÷ $7,917 = $3,946 ÷ $7,917 = 49.8% — borderline for FHA (max ~50%); tight for conventional

    Conclusion: Maria can likely qualify with FHA (higher DTI flexibility) but would need strong compensating factors for conventional. A larger down payment (reducing P&I and eliminating PMI) or lower property taxes would improve her ratios.

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    Key Terms

  • PITI: Principal, Interest, Taxes, Insurance — the four components of a monthly mortgage payment
  • Housing ratio (front-end DTI): PITI ÷ gross monthly income; benchmark 28% (conventional)
  • Total DTI (back-end): (PITI + all recurring debts) ÷ gross monthly income; benchmark 36–43%
  • Compensating factors: Factors that offset high DTI (large down payment, high reserves, excellent credit, overtime income)
  • Texas property tax rate: ~2.0%–2.8% of assessed value annually; significantly higher than national average
  • FHA DTI flexibility: Allows up to 56.9% total DTI with automated underwriting approval and compensating factors
  • PMI: Private mortgage insurance required on conventional loans with <20% down
  • MIP: Mortgage Insurance Premium (FHA-specific); includes upfront and annual components
  • Residual income: VA underwriting test that examines remaining income after all obligations; family size and region-specific

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Quiz Questions:

Q1. A Texas buyer has a gross monthly income of $6,500. A conventional lender uses a 28% front-end housing ratio limit. The monthly PITI on a proposed home (including $650/mo in Texas property taxes) is $2,100. Does the buyer meet the front-end ratio guideline?

A) Yes — $2,100 ÷ $6,500 = 32.3%, which is within the conventional 28% guideline B) No — $2,100 ÷ $6,500 = 32.3%, which exceeds the 28% conventional front-end guideline C) Yes — Texas property taxes are excluded from the housing ratio calculation D) No — the 28% guideline applies only to principal and interest, not taxes and insurance

Answer: B — $2,100 ÷ $6,500 = 32.3%, which exceeds the 28% conventional guideline. Taxes and insurance are always included in PITI for ratio calculations. Texas's high property taxes frequently push buyers over front-end ratios, requiring larger incomes, lower loan amounts, or FHA (which has more flexibility at 31%).

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Q2. Why do Texas buyers often have a harder time qualifying for the same loan amount compared to buyers in states like California at the same purchase price?

A) Texas requires larger down payments by state law B) Texas property taxes (~2.5%) are significantly higher than in California (~1.1%), increasing PITI and pushing DTI ratios higher C) Texas has a state income tax that reduces take-home pay D) Texas lenders use stricter credit score requirements than other states

Answer: B — Texas has some of the highest property tax rates in the country, which directly increases the monthly PITI. This raises both the front-end and back-end DTI ratios, making the same loan harder to qualify for in Texas vs. a lower-tax state. Notably, Texas has NO state income tax (making C incorrect) and no state-specific credit requirements (making D incorrect).

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Q3. A self-employed Texas landscaper earned $85,000 net income (after write-offs) in Year 1 and $95,000 net income in Year 2. How will a conventional lender typically calculate his qualifying monthly income?

A) $95,000 ÷ 12 = $7,917 (most recent year only) B) ($85,000 + $95,000) ÷ 2 = $90,000 annual; $90,000 ÷ 12 = $7,500/mo (2-year average) C) $85,000 ÷ 12 = $7,083 (lower year as a conservative measure) D) Gross revenue before write-offs, as documented on Schedule C

Answer: B — Conventional underwriting for self-employed borrowers uses the average of the most recent 2 years' net income from tax returns. Large write-offs that reduce taxable income also reduce qualifying income — a trade-off Texas small business owners frequently face.

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Q4. A Texas buyer with a 42% total DTI applies for a conventional loan. The lender's standard guideline is 43% maximum DTI. Which of the following would NOT be considered a compensating factor to support approval?

A) 12 months of cash reserves in the bank (enough to cover 12 mortgage payments) B) A credit score of 760 with no late payments in 7 years C) A 25% down payment on the property D) A second car loan co-signed by a parent

Answer: D — The co-signed car loan is a liability, not a compensating factor. In fact, if the buyer is making payments on it, it would be included in DTI. Compensating factors are positive attributes that offset risk: reserves (A), excellent credit history (B), and a large down payment (C) all demonstrate financial strength and reduce lender risk.

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Q5. A Texas buyer is financing a $450,000 home and putting 5% down ($22,500). Which component is added to PITI for a conventional loan at this LTV?

A) FHA Mortgage Insurance Premium (MIP) — upfront and annual B) VA Funding Fee — financed into the loan C) Private Mortgage Insurance (PMI) — required on conventional loans with less than 20% down D) USDA Guarantee Fee — annual and upfront

Answer: C — PMI (Private Mortgage Insurance) is required on conventional loans when the down payment is less than 20% (LTV > 80%). MIP applies to FHA loans; the VA Funding Fee applies to VA loans; the USDA Guarantee Fee applies to USDA loans. PMI typically costs 0.25%–1.0% of the loan annually and is added to the monthly payment until LTV reaches 80%.