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Real Estate InvestorGenerated accuracy model review: 2026-05-06

Vacancy Loss Calculator 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

  • Vacancy loss = potential rental income x vacancy rate / 100. Effective rental income = potential rental income - vacancy loss.

Test cases

Default input regression check

Generated from the checked-in default inputs and calculate function.

Inputs

  • Potential Rental Income: $36,000
  • Vacancy Rate: 8%

Expected outputs

  • Vacancy Loss: $2,880.00
  • Effective Rental Income: $33,120.00

Known limitations

  • This calculator is a planning model only. It does not predict appreciation, market liquidity, lender approval, tax treatment, insurance availability, permit risk, legal obligations, construction defects, tenant behavior, or final sale price.

Assumptions

  • All costs, rents, ARV, loans, reserves, fees, and rates are user-entered assumptions.
  • Calculations are deterministic and do not fetch market rents, tax rules, insurance quotes, lender terms, or property records.
  • Results are estimates only and are not financial, tax, legal, lending, appraisal, inspection, or investment advice.

Unit handling

  • Potential Rental Income accepts values in $.
  • Vacancy Rate accepts values in %.
  • Vacancy Loss is displayed as currency.
  • Effective Rental Income is displayed as currency.

Rounding rules

  • Number displays use up to 2 decimal places in the calculator UI.
  • Currency outputs are displayed with standard US dollar formatting.
  • Input precision follows configured step values where provided.

Version history

1.0.0 - 2026-05-06

Generated accuracy and testing page from the current vacancy-loss-calculator calculator definition.

Change log

2026-05-06

Published default regression test documentation and metadata fallbacks for Vacancy Loss Calculator.

Calculator transparency

Accuracy pages are generated from checked-in calculator definitions and can be upgraded with curated review metadata over time.

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