Transparency
Calculator methodology, assumptions, and sources
PropCalcHub provides planning estimates, not quotes or transaction documents. This page explains what the calculators do, where the starting assumptions come from, and which values users should replace with property-specific information.
Methodology page reviewed September 22, 2026.
Formula reference
Results are calculated from user inputs and editable defaults. Rounding can cause small differences between the displayed components and professional closing documents.
| Result | Planning formula |
|---|---|
| Seller net proceeds | Sale price − mortgage payoff − commission − concessions − transfer taxes − seller fees |
| Buyer cash to close | Down payment + lender/title/recording costs + prepaid expenses + other buyer costs − credits |
| Loan principal | Home price − down payment |
| Monthly principal and interest | Standard fixed-rate amortization using principal, monthly interest rate, and total payment count |
| Rental NOI | Gross scheduled rent − vacancy allowance − operating expenses; debt service is excluded |
| Monthly rental cash flow | Rental income − operating expenses − financing payments |
| Cap rate | Annual net operating income ÷ purchase price |
| Cash-on-cash return | Annual pre-tax cash flow ÷ initial cash invested |
Editable assumptions
Defaults are starting points, not predictions. Replace them with a Loan Estimate, Closing Disclosure, payoff statement, purchase contract, title or attorney quote, insurance quote, tax record, HOA statement, inspection estimate, or property manager budget whenever one is available.
Location handling
ZIP code is used only to select a state-level planning rule. It cannot reliably infer county, city, deed type, exemption, local surcharge, negotiated payer, title custom, or closing date. A local professional or government office remains the authoritative source for a specific transaction.
Source standards
The site prefers government agencies, regulators, and primary program documentation. General educational sources are used for context only. A cited source does not imply endorsement of PropCalcHub or confirm that a default applies to a particular property.
- Consumer Financial Protection Bureau: Loan Estimate
Loan costs, prepaid expenses, escrow concepts, and terminology used in buyer estimates.
- Consumer Financial Protection Bureau: Closing Disclosure
Final closing-cost categories and the distinction between an estimate and a closing document.
- HUD: Buying a Home
General homebuying and FHA-oriented educational context.
- IRS Publication 523
Home-sale tax terminology. PropCalcHub does not calculate a user’s taxable gain.
- State and local revenue or recording authorities
Transfer-tax planning defaults. Local rules, exemptions, tiers, and payer customs require direct verification.
Review and change controls
- Material formula or default changes are reviewed before deployment.
- State rules are treated as planning data and should be rechecked against current state or local sources.
- Articles that cannot meet the site’s sourcing and decision-support standard are not kept in the public library.
- Corrections are applied across calculators, guides, and explanatory examples where the same assumption appears.
Known limitations
- No credit, underwriting, appraisal, tax, legal, or title analysis is performed.
- Variable-rate loans, unusual payment structures, and transaction-specific tax treatment may require separate calculations.
- Rental projections do not predict rent growth, appreciation, repairs, vacancy, financing changes, or investment returns.
- Results are not a Loan Estimate, Closing Disclosure, settlement statement, net sheet, or professional opinion.