# costsegtool.com

> Free cost segregation calculator. Enter your property value and type to see estimated Year-1 tax savings with 100% bonus depreciation. Engineering-based methodology, IRS ATG compliant. Operated by Cost Seg Smart.

## What the tool does

- Interactive calculator that takes property value, property type, and acquisition year as inputs
- Applies engineering-based reclassification rates by property type (SFR, STR, condo, multifamily, commercial)
- Applies 100% bonus depreciation for property placed in service 2025+ (OBBBA, signed July 2025)
- Outputs estimated Year-1 federal tax deduction and savings at user's marginal rate

## Methodology

- **5-year property** (personal property, finishes, furniture): 15–30% of basis typical
- **7-year property** (interior finishes, specialty items): 2–5%
- **15-year property** (land improvements): 8–15%
- **27.5- or 39-year** (remaining building shell): balance
- Rates vary by property class — STRs typically reclassify 25–35%, commercial 15–25%

## Order a study

Results from the calculator are directional estimates. For an IRS-defensible engineering study, order via [Cost Seg Smart](https://costsegsmart.com) — pricing starts at $495.

## Key facts

- Bonus depreciation is **100% for property placed in service 2025 and later** (permanently restored by OBBBA).
- IRS Audit Technique Guide (Cost Segregation, 2017) enumerates 13 elements of a quality study.
- Site visit is NOT required per the ATG when plans, photos, and invoices are available.
- Typical year-1 tax savings: $20K–$180K depending on property basis and reclassification rate.

## Related sites

- [Cost Seg Smart](https://costsegsmart.com) — order a study
- [Cost Segregation Pricing](https://costsegregationpricing.com) — pricing reference
- [Cost Segregation Reviews](https://costsegregationreviews.com) — provider ratings
- [Cost Segregation Airbnb](https://costsegregationairbnb.com) — STR-specific guide
- [High Income Tax Hacks](https://highincometaxhacks.com) — broader tax strategy
- [Cheap Cost Seg](https://cheapcostseg.com) — budget-tier comparison

## Contact

Cost Seg Smart — support@costsegsmart.com