How Much Is the Mortgage on a $400K House in Texas?

The Full Monthly Cost of a $400,000 Texas Home

The mortgage payment on a $400,000 Texas home is only part of the true monthly housing cost. In Texas, property taxes add $550–$750/month to the payment depending on county and municipality — substantially more than the national average. Building the full PITI (principal, interest, taxes, insurance) from the ground up shows why Texas buyers need higher income to qualify than buyers purchasing equivalent homes in lower-tax states.

Using $400,000 purchase price, 1.9% representative Texas property tax rate (mid-range for most suburban DFW, Austin, and Houston markets — some districts run higher), and $3,200/year homeowners insurance as a representative Texas premium for this home value:

Monthly property tax at 1.9%: $400,000 × 1.9% ÷ 12 = $633/month

Monthly insurance: $3,200 ÷ 12 = $267/month

Monthly escrow total: $900/month

This $900/month escrow component is fixed regardless of your mortgage rate or down payment — it comes with every $400,000 Texas home at this tax rate, at every loan program. Budget it as a floor beneath your total housing payment.

PITI Scenarios at $400,000 Purchase Price

FHA, 3.5% down ($14,000 down):

• Loan: $386,000 + UFMIP $6,755 financed = $392,755
• P&I at 6.875%: $2,580/month
• Annual MIP at 0.55%: $180/month
• Escrow (taxes + insurance): $900/month
• Total PITI: $3,660/month
• Cash needed (down + estimated closing costs): $14,000 + $8,000–$12,000 = $22,000–$26,000

Conventional, 5% down ($20,000 down):

• Loan: $380,000
• P&I at 7.125% (6.875% + LLPA at ~680 FICO/95% LTV): $2,559/month
• PMI at 0.75%: $237/month
• Escrow: $900/month
• Total PITI: $3,696/month
• Cash needed: $20,000 + $8,000–$12,000 = $28,000–$32,000

Conventional, 10% down ($40,000 down):

• Loan: $360,000
• P&I at 7.0% (better LLPA at 90% LTV, 680+ score): $2,396/month
• PMI at 0.60%: $180/month
• Escrow: $900/month
• Total PITI: $3,476/month
• PMI cancels at approximately year 9–11 with 4% annual appreciation

Conventional, 20% down ($80,000 down), no PMI:

• Loan: $320,000
• P&I at 6.875% (minimal LLPA at 720+ FICO, 80% LTV): $2,103/month
• No PMI
• Escrow: $900/month
• Total PITI: $3,003/month
• Cash needed: $80,000 + $9,000–$13,000 = $89,000–$93,000

VA, 0% down (eligible veterans, first use):

• Loan: $400,000 + $8,600 (2.15% fee financed) = $408,600
• P&I at 6.875%: $2,684/month
• No PMI or MIP
• Escrow: $900/month
• Total PITI: $3,584/month
• Cash needed: $0 down + $5,000–$9,000 in non-VA closing costs (potentially reduced or eliminated with seller concessions)

Income Required to Qualify

Using back-end DTI methodology (total monthly debt ÷ gross monthly income), the minimum gross annual income needed for each scenario above assumes no other monthly debt obligations:

• FHA 3.5% down ($3,660 PITI) at 43% DTI: $3,660 ÷ 0.43 = $8,512/month = $102,144/year minimum
• FHA at 50% DTI (with compensating factors): $3,660 ÷ 0.50 = $7,320/month = $87,840/year minimum
• Conventional 5% down ($3,696) at 45% DTI: $3,696 ÷ 0.45 = $8,213/month = $98,560/year minimum
• Conventional 10% down ($3,476) at 45% DTI: $3,476 ÷ 0.45 = $7,724/month = $92,693/year minimum
• Conventional 20% down ($3,003) at 43% DTI: $3,003 ÷ 0.43 = $6,984/month = $83,814/year minimum
• VA ($3,584) at 41% DTI (VA reference): $3,584 ÷ 0.41 = $8,741/month = $104,890/year minimum

With $700/month in other monthly obligations (car payment + minimum credit card payments): Add $700 ÷ 0.43 × 12 = $19,535 to each figure above at 43% DTI. FHA becomes approximately $121,679/year; conventional 20% down becomes $103,349/year.

These income requirements are higher than most online calculators show for a $400,000 home because they include Texas’s actual property tax burden. Calculators using national-average tax rates understate Texas housing costs and overstate qualifying power for Texas buyers.

Rate Sensitivity: How Much Each 0.25% Matters

On a $380,000 30-year mortgage (conventional 5% down), the monthly P&I payment changes as follows at different rate levels:

• 6.50%: $2,403/month
• 6.75%: $2,465/month — $62/month more than 6.50%
• 7.00%: $2,528/month — $63/month more than 6.75%
• 7.25%: $2,593/month — $65/month more than 7.00%
• 7.50%: $2,659/month — $66/month more than 7.25%

Each 0.25% increment adds approximately $63–$66/month to the P&I payment on a $380,000 loan — $756–$792/year. Over 7 years before a potential refinance: $5,292–$5,544 in additional interest per 0.25% of rate. Shopping lenders and comparing lock-in timing on a $380,000+ loan produces real financial outcomes — a 0.25% rate difference between two lenders is $5,000+ over a reasonable hold period. Spend the 90 minutes to get a second and third lender quote.

HOA Fees: An Additional Texas Variable

Many Texas communities — particularly in master-planned developments in Frisco, McKinney, Sugar Land, Katy, and similar suburban areas — have homeowners association fees in addition to property taxes. HOA fees range from $50/month for minimal common area maintenance to $400–$800/month for communities with amenities (pools, fitness centers, gated entry, private streets). HOA fees are not included in your PITI calculation as lenders define it, but they are a real recurring housing cost that affects your actual monthly budget.

For lender DTI purposes: some loan programs include HOA fees in the DTI calculation; others don’t. Conventional loans include HOA dues in the PITIA (housing expense) calculation used for front-end DTI, which can affect qualification. Confirm with your lender how HOA fees are treated in your specific qualification scenario. For budget purposes, add the full HOA fee to your PITI to understand true total housing cost.

A $400,000 home in a community with a $300/month HOA has a true total monthly housing cost of PITI + $300 — potentially $3,900–$4,000/month total. Factoring HOA fees into your purchase price target and loan program selection before you fall in love with a specific community saves significant recalculation later in the process.

Texas Property Tax by District: The $400,000 Home Comparison

At a $400,000 purchase price, the monthly property tax payment varies substantially across Texas municipalities — sometimes by $200–$300/month for the same-priced home in different parts of the same metro area:

• Dallas ISD (DISD): 2.15–2.40% → $717–$800/month on $400,000
• Richardson ISD (Collin County): approximately 1.85–2.05% → $617–$683/month
• Frisco ISD (Collin County): approximately 1.70–1.95% → $567–$650/month
• Houston ISD (HISD): approximately 2.05–2.45% → $683–$817/month
• Katy ISD (Fort Bend/Harris): approximately 1.80–2.10% → $600–$700/month
• Austin ISD (Travis County): approximately 1.85–2.10% → $617–$700/month
• Round Rock ISD (Williamson County): approximately 1.80–2.00% → $600–$667/month
• San Antonio: Northside ISD approximately 1.75–2.00% → $583–$667/month

The range across these markets — $567/month (Frisco ISD) to $817/month (HISD high end) — represents a $250/month difference in housing cost on the same $400,000 home. Over a 10-year ownership period: $30,000 in additional property taxes paid in the higher-tax district versus the lower. This is a real financial variable worth incorporating into neighborhood selection, not just school quality and commute time.

Homestead Exemption Impact on the $400,000 Home

Filing the Texas homestead exemption (Form 50-114 with your county appraisal district by April 30 following purchase) reduces the school district taxable value by $100,000. At most Texas school district tax rates of $0.80–$1.20 per $100 of value, the $100,000 exemption saves $800–$1,200/year starting in year two.

On a $400,000 home at a typical combined Texas tax rate of 2.0% (school district + county + city + special districts), the exemption saves approximately $960–$1,200/year in school district taxes alone. Monthly: $80–$100/month in tax savings beginning year two. The year-two escrow analysis from your servicer will reflect this and typically results in either a $400–$600 refund or a comparable reduction in your monthly escrow payment.

The compounding benefit: the 10% annual assessment cap that activates with the homestead exemption limits your taxable value increases to 10%/year maximum. In a high-appreciation period (Texas markets appreciated 15–25% in 2021–2022), homesteaders received the capped assessment while new buyers purchased at full market value and received full reassessment. After 5 years in a market appreciating 10%/year, a homesteaded owner’s taxable value lags actual market value by a growing gap — representing meaningful annual tax savings that compound with each year of ownership and appreciation.

When to Lock Your Rate on a $400,000 Purchase

Rate lock decisions matter more on a $400,000 purchase than on a $250,000 one because the dollar impact of rate movement is proportionally larger. A 0.25% rate increase on a $380,000 loan is approximately $65/month — $780/year. An unexpected rate jump of 0.50% while your loan is in process adds approximately $130/month to your payment for the life of the loan.

Standard rate lock periods are 30, 45, and 60 days. A 30-day lock is typically priced best but requires the transaction to close within the lock window — which requires a smooth inspection, appraisal, and underwriting process. A 45-day lock provides more cushion at modest additional cost (approximately 0.125–0.25 points on many lenders’ pricing). Extended locks beyond 60 days are available for new construction with longer build timelines but carry meaningful pricing premium.

In a volatile rate environment, ask your lender about float-down provisions: the ability to reduce your locked rate if market rates drop during your lock period, typically for a fee of 0.25–0.50 points. On a $380,000 loan, paying 0.375 points ($1,425) for a float-down provision that captures a 0.25% rate improvement saves $65/month — break-even at 22 months. If you have reason to believe rates may decline during your 45-day lock window, the float-down math is worth running with your specific lock terms and loan amount.