Home Affordability Calculator

Minimum actual independently lender/borrower assessed purchase price caps, one currency minor units, not derive a universal income multiplier, mortgage eligibility or lending approval.

Description

Purchase-price caps can summarize separately assessed affordability constraints.

Purchase-price caps can summarize separately assessed affordability constraints.^[1]

Taking their minimum requires each cap to use the same currency and purchase-price definition. The calculation and input requirements are explained below.

When to use Home Affordability Calculator

Enter nonempty nonnegative safe integer purchase-price caps in a single currency's minor units.

How to use Home Affordability Calculator and how it works

Prepare the measurements or independently established model inputs described below, with matching units and observation scope.
Enter the required fields and run Home Affordability Calculator.
Read the result fields using the formula, output units, signs and ordering explained below.
Correct any rejected inputs and rerun; interpret the result within the stated model and its assumptions.

Input field	Meaning	Value type	Requirement
callerIndependentApplicablePurchasePriceCapsMinorUnits	Caller Independent Applicable Purchase Price Caps Minor Units. Use the units and matching context stated in the calculation below.	array of number	Required; other constraints below

Enter nonempty nonnegative safe integer purchase-price caps in a single currency's minor units. Return the minimum cap. The tool does not assess income, spending, loan eligibility or the correctness of each cap.

purchasePriceCapMinor=min(independentlyAssessedCapsMinor)

Apply the input ordering, units and branch conditions stated above.

Output field	Meaning	Value type
result	Object containing the calculated or selected fields below.	object
result.value	Numeric result under the formula and output units explained above.	number

json

{
  "input": {
    "callerIndependentApplicablePurchasePriceCapsMinorUnits": [
      100,
      200
    ]
  },
  "output": {
    "result": {
      "value": 100
    }
  }
}

Limitations and assumptions

The calculation uses the supplied observations and model inputs. It does not collect measurements, select a reference population or coefficient, or establish that the model applies to the actual case. The stated branch conditions and output units remain part of the result.

All fields require explicit values. Unexpected fields, wrong types, nonfinite numbers and sparse arrays are rejected. Alignment, bounds and supported-token rules are explained above; extremely large inputs or nonfinite results can also fail. Input errors differ from successful false comparisons, unavailable-domain flags and empty match lists.

Home affordability involves costs beyond a purchase price or mortgage payment. This tool takes the minimum of separately assessed caps and does not construct a household budget.^[2]

Alternative or Complementary methods

Use Rent vs Buy NPV Calculator for a complementary operation: Rent-versus-buy NPV compares independently specified scenario cash flows on the same timeline.

Use Rent vs Buy Breakeven Calculator for a complementary operation: An observed rent-versus-buy break-even point compares cumulative costs at discrete periods.

References

Home Affordability Calculator — tool.io
CFPB: Financial considerations of buying a home — Consumer Financial Protection Bureau

Similar or alternative tools

Rent vs Buy NPV Calculator
Rent-versus-buy NPV compares independently specified scenario cash flows on the same timeline.
Rent vs Buy Breakeven Calculator
An observed rent-versus-buy break-even point compares cumulative costs at discrete periods.