Pre Tax Home Mortgage Calculator

How to use the pre tax home mortgage calculator

1. Prepare the values for this calculation

   Calculate a mortgage scenario with explicit price, down payment, interest, term, housing costs and optional adjustments. Use the formula below to check that it answers your question. Read the input units before transferring figures from a statement, measurement or dataset.

2. Enter and check each input

   • Home price: enter a value at least 0. Use the unit named in the label or selected above. Do not leave this required field blank.
   • Down payment (%): enter a value at least 0 and no more than 99.9. Use the unit named in the label or selected above. Do not leave this required field blank.
   • Annual nominal interest rate (%): enter a value at least 0 and no more than 100. Use the unit named in the label or selected above. Do not leave this required field blank.
   • Term (years): enter a value at least 0.01 and no more than 50. Use the unit named in the label or selected above. Do not leave this required field blank.
   • Annual property tax (% of value): enter a value at least 0 and no more than 20. Use the unit named in the label or selected above. Do not leave this required field blank.
   • Annual homeowners insurance: enter a value at least 0. Use the unit named in the label or selected above. Do not leave this required field blank.
   • Monthly HOA/other housing charge: enter a value at least 0. Use the unit named in the label or selected above. Do not leave this required field blank.
   • Upfront/financed fees: enter a value at least 0. Use the unit named in the label or selected above. Do not leave this required field blank.
   • Extra payment per payment period: enter a value at least 0. Use the unit named in the label or selected above. Do not leave this required field blank.
   • Inflation assumption (%): enter a value at least -99 and no more than 100. Use the unit named in the label or selected above. Do not leave this required field blank.
   • Marginal tax-rate assumption (%): enter a value at least 0 and no more than 100. Use the unit named in the label or selected above. Do not leave this required field blank.
   • Interest treated as deductible in this model (%): enter a value at least 0 and no more than 100. Use the unit named in the label or selected above. Do not leave this required field blank.
   • Early-payoff penalty assumption (%): enter a value at least 0 and no more than 100. Use the unit named in the label or selected above. Do not leave this required field blank.
   • Points paid (% of loan): enter a value at least 0 and no more than 20. Use the unit named in the label or selected above. Do not leave this required field blank.
   • Modeled rate reduction per point (percentage points): enter a value at least 0 and no more than 10. Use the unit named in the label or selected above. Do not leave this required field blank.
   • Elapsed years before payoff/penalty: enter a value at least 0 and no more than 50. Use the unit named in the label or selected above. Do not leave this required field blank.

   The input table gives a complete example. Keep units and time periods consistent across related fields.

3. Calculate and resolve any input error

   Choose Calculate after entering the values. Changes also update the answer after a short pause. If an error appears, follow its message, correct the field and calculate again. Reset restores the example values.

4. Interpret the answer

   Check Mortgage result first. With the unchanged example inputs, it is $2,539.28. Compare the additional metrics with the primary result; each has its own label and unit.

5. Compare and keep a useful result

   For a controlled comparison, keep every other example input unchanged and change Home price from 400000 to 440000. The resulting Mortgage result is $2,778.21. This illustrates the equation’s response to that input, rather than a forecast of real events.

   Read the chart’s axis labels and data table. A scenario curve changes one stated input while holding the others fixed; it does not add external observations. Use Download graph to save an available chart as a PNG.

   Use Copy result or Download CSV to keep the answer. Share tool shares the page address without placing your input values in the URL. Recheck inputs and assumptions before using the result for a decision.

Pre Tax Home Mortgage Calculator formula

Loan principal is purchase price less down payment plus financed fees. Scheduled payment uses the fixed-rate amortization formula at the selected payment frequency.

Inputs and units

Worked example

Using the example inputs above, the mortgage result is $2,539.28.

Mortgage result

$2,539.28

Loan principal

$320,000.00

Principal & interest (12 payments/year)

$2,022.62

Property tax per payment

$366.67

Insurance per payment

$150.00

HOA/other per payment

$0.00

Modeled total housing payment

$2,539.28

Results and assumptions

Taxes, insurance, HOA, fees and inflation are user-entered assumptions. This is not a lender quote.

Fix an input or unexpected result

Home price is required. Enter home price using the format and bounds in the input table. Zero and an empty field are different: use zero only if it is allowed and represents your data.

If your answer differs from the example, choose Reset and compare every field, including selected units and options. Check percentage versus decimal entry and whether values describe the same period. Round only the final displayed answer when reproducing the formula.

If a discrepancy remains, report the calculator issue with the page address, non-sensitive example inputs, actual result, expected result and a reference for your calculation.

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