cost segregation calculator
Cost Segregation Calculator: What It Can and Cannot Tell You
A cost segregation calculator can screen potential savings, but it cannot replace property-specific documentation, classification analysis, or CPA review.
Direct answer
A cost segregation calculator can estimate whether accelerated depreciation might be worth exploring. It cannot tell you which components are supportable, whether your facts qualify, how passive activity rules affect use of losses, or whether the final return position is defensible.
Use calculators for screening, not filing.
Inputs a useful calculator needs
A realistic calculator should ask for more than purchase price:
- Building basis after land allocation.
- Property type.
- Placed-in-service date.
- Purchase, construction, or renovation context.
- Federal and state tax assumptions.
- Passive activity and income assumptions.
- Holding period and sale plans.
- Bonus depreciation assumptions.
Why calculator estimates differ
Two calculators can produce different numbers because they assume different percentages for short-life property, different bonus depreciation treatment, different tax rates, or different holding periods.
| Estimate type | Best use |
|---|---|
| Simple percentage estimate | Fast initial screening. |
| Property-type estimate | Better for comparing residential, commercial, or short-term rental scenarios. |
| Document-based estimate | Better pre-review because it uses your actual property records. |
| Professional report | Best support for a tax position when properly prepared and reviewed. |
Calculator red flags
Be cautious when a calculator:
- Promises a deduction without reviewing property facts.
- Ignores land allocation.
- Ignores placed-in-service date.
- Does not ask about passive activity limits.
- Treats every property type the same.
- Does not explain assumptions.
How CostSegHelpAI approaches estimates
CostSegHelpAI is designed to start with the estimate, then force the evidence trail: documents, photos, component details, and questions for review. That makes the screening number more useful and easier for a CPA to evaluate.
FAQ
Can a calculator show first-year savings?
It can estimate first-year benefit if it includes bonus depreciation and tax-rate assumptions. The real result depends on current law and your tax facts.
Should I use a calculator before ordering a study?
Yes, as a screening step. Then collect records and ask your CPA whether the estimate is usable.
Does a calculator create audit support?
No. Audit support comes from facts, classification logic, source records, and professional review.