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Official References & Data Sources

Every calculator is built on citable, publicly available official sources. Transparency you can verify.

🏛️ IRS Official Publications

The foundation of all tax and depreciation calculations. These are the authoritative IRS sources.

https://www.irs.gov/publications/p527
Used for: Residential rental property depreciation (27.5-year recovery period), mid-month convention, land vs. building allocation, and what improvements are depreciable. Tab 4 (IRS Depreciation Calculator) follows Pub 527 formulas exactly.
https://www.irs.gov/publications/p946
Used for: General depreciation rules, bonus depreciation, Section 179 expensing, and listed property rules. References the Modified Accelerated Cost Recovery System (MACRS) which governs all U.S. property depreciation.
https://www.irs.gov/taxtopics/tc701
Used for: Understanding tax-deferred like-kind exchanges for real estate. The upcoming Tab 8 (1031 Exchange) will model deferred gain calculations based on IRC § 1031 rules. Note: after the 2017 Tax Cuts and Jobs Act, 1031 applies only to real property (not personal property).
https://www.irs.gov/taxtopics/tc415
Used for: Passive activity loss rules, hobby loss rules, and what rental expenses are deductible. Tab 4 references Topic 415 for taxable income after depreciation.

🏘️ HUD — Fair Market Rent Data

HUD User — Fair Market Rent (FMR) Datasets ↗
https://www.huduser.gov/portal/datasets/fmr.html
Used for: Regional fair-market rent benchmarks that anchor our return-on-investment baselines and state-by-state rent comparisons.

🏦 FHFA — Investment Property Mortgage Policy

FHFA — Fannie Mae & Freddie Mac Rental Housing Policy ↗
https://www.fhfa.gov/news/news-release/fhfa-enables-fannie-mae-and-freddie-mac-to-expand-support-for-rental-housing
Used for: Authoritative explanation of investment-property loan limits and underwriting standards that shape our mortgage and loan-comparison calculators.

📈 Census Bureau — ACS Housing Cost Statistics

U.S. Census Bureau — American Community Survey (ACS) ↗
https://www.census.gov/programs-surveys/acs
Used for: Macro housing-cost data — vacancy rates, price-to-rent ratios, and regional market context behind our state guides.

🏢 NAA — Rental Housing Operating Cost Research

National Apartment Association — Research & Publications ↗
https://www.naahq.org/publications/research
Used for: Industry-average operating costs and vacancy-loss figures that improve the realism of our expense and reserve assumptions.

📚 CRS — Congressional Research Service Housing Policy

CRS Report — Institutional Residential Investment (R49015) ↗
https://www.everycrsreport.com/reports/R49015.html
Used for: Neutral, non-partisan background on institutional residential investment policy referenced in our market-context writing.

✅ How to Verify Our Methodology

Transparency means you can verify every claim. Here's how:

1
Check the IRS sources: Click any IRS link above. Publication 527 and 946 are free, public documents. Verify that our depreciation formula matches the IRS straight-line method.
2
Cross-reference market data: Visit HUD User (Fair Market Rent) and the Census ACS to verify rent benchmarks and regional housing-cost figures for your target market.
3
Test with your CPA: Show the depreciation schedule from Tab 4 to your CPA. Ask if the straight-line calculation matches what they would file on IRS Form 4562.
4
View page source: All calculator logic runs in your browser. Right-click → "View Page Source" to see the JavaScript. No black boxes.

Methodology & Sources — FAQ

Contact & corrections

RentalInvestCalc is an independent editorial project. Spot a data error or want a source added? Email 18999737@qq.com or read our About page. We publish estimates and guides, not tax, legal, or financial advice — always confirm figures with the county assessor and a licensed CPA or attorney.