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Finance & LoansGenerated accuracy model review: 2026-05-06
Down Payment accuracy and testing
This page documents how Calwarden builds trust for this calculator: source notes, regression-style default tests, limitations, assumptions, unit handling, rounding, and visible change history.
Formula source
- Uses the checked-in calculator function for down-payment-calculator.
Test cases
Default input regression check
Generated from the checked-in default inputs and calculate function.
Inputs
- Home Price: $300,000
- Cash Available: $60,000
Expected outputs
- Down Payment %: 20.00%
- Loan Amount: $240,000.00
- LTV Ratio: 80.00%
Known limitations
- Does not include closing costs (usually an additional 2-5% of purchase price).
Assumptions
- The model focuses only on purchase price, down payment cash, and resulting loan-to-value ratio.
- Closing costs and lender program minimums are not included in the cash requirement.
- PMI guidance is simplified around common 20% down / 80% LTV thresholds.
Unit handling
- Home Price accepts values in $.
- Cash Available accepts values in $.
- Down Payment % is displayed as a percentage.
- Loan Amount is displayed as currency.
- LTV Ratio is displayed as a percentage.
Rounding rules
- Number displays use up to 2 decimal places in the calculator UI.
- Currency outputs are displayed with standard US dollar formatting.
- Percent outputs are displayed with two decimal places.
Version history
1.0.0 - 2026-05-06
Generated accuracy and testing page from the current down-payment-calculator calculator definition.
Change log
2026-05-06
Published default regression test documentation and metadata fallbacks for Down Payment.
Calculator transparency
Accuracy pages are generated from checked-in calculator definitions and can be upgraded with curated review metadata over time.