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Guide

DTI housing payment inputs (PITI, HOA, PMI)

DTI uses a full housing payment, not just principal and interest. This guide explains what to include so your affordability estimates align with lender calculations.

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DTI inputs to verify

  • Gross monthly income from documented sources.
  • Housing payment (PITI + HOA + PMI if applicable).
  • Required minimum payments for other debts.
  • Any lender-specific rules for student loans or deferred debt.

What to include in housing payment

  • Principal and interest (P&I).
  • Property taxes.
  • Homeowners insurance.
  • HOA dues (if applicable).
  • PMI or mortgage insurance (if applicable).

PITI definition and monthly estimate

PITI stands for principal, interest, taxes, and insurance. Even if you do not escrow taxes and insurance, lenders still use a monthly estimate in DTI calculations.

  • Monthly taxes = annual tax bill / 12.
  • Monthly insurance = annual premium / 12.
  • Add HOA and PMI to get the full housing payment.

Escrow vs no escrow

Whether you escrow or not, DTI should still include taxes and insurance as monthly equivalents. Leaving them out can make your DTI look better than the lender's underwriting calculation.

Estimating taxes and insurance

If you do not have a quote, use local averages and then update the inputs once you receive a Loan Estimate. Understating these items will make DTI look better than it really is.

PMI and HOA

PMI and HOA are often missed in early estimates. If either applies, include them so your back-end DTI matches the lender's underwriting calculation.

Refinance and rent scenarios

For refinances, use the new projected payment, not the current payment. For rent-based affordability checks, use the actual rent as the housing input.

Example housing payment input

If principal and interest are $1,650, taxes are $3,600 per year, insurance is $1,200 per year, HOA is $75 per month, and PMI is $90 per month, the DTI housing payment is $1,650 + $300 + $100 + $75 + $90 = $2,215.

Inputs to verify

  • Tax rate or most recent tax bill.
  • Homeowners insurance quote.
  • HOA dues and payment schedule.
  • PMI estimate if under 20% down.

Decision checklist

  • Use monthly PITI + HOA + PMI for DTI inputs.
  • Update assumptions once the Loan Estimate arrives.
  • Recalculate if taxes or insurance change after purchase.
  • Keep housing inputs consistent across scenarios.

Decision inputs

  • Quoted tax and insurance estimates vs actual bills.
  • HOA dues schedule and any planned increases.
  • PMI or mortgage insurance estimate by loan program.
  • Escrow cushion assumptions in the payment.
  • Income volatility buffer for conservative DTI.

Checklist

  • Use PITI + HOA + PMI for mortgage scenarios.
  • Update estimates when a Loan Estimate is available.
  • Use consistent assumptions when comparing options.

Common mistakes

  • Using only principal and interest as the housing input.
  • Forgetting HOA or PMI.
  • Using outdated tax or insurance estimates.
  • Comparing scenarios with inconsistent assumptions.

References

Next steps

Run DTI with full housing payment DTI calculation steps What counts in DTI What is PITI

Educational use only. Not financial advice.

Last updated: 2026-02-17