Cost Segregation Calculator

Cost segregation is sold on the first-year write-off, and the figure is genuinely large — six figures on a modest commercial building. It is also close to meaningless on its own.

A study does not create deductions. It moves them. Every dollar pulled into year one is a dollar that will not be deducted in years two through thirty-nine, and the total depreciation over the life of the property is identical either way. What you have actually bought is the use of the tax saving in the meantime.

That makes the benefit a present-value question, and it depends almost entirely on your discount rate. An investor who can deploy the cash at 12% gains a great deal; one who will leave it in a savings account gains very little. The same study, the same building, materially different answers.

This is why the honest version of the calculation discounts the deductions year by year rather than reporting the year-one figure. On a $1.2m depreciable basis with a quarter reclassified, the first-year saving can be a hundred thousand dollars while the real gain is a fraction of that.

There is a second cost, and unlike the timing argument it is not merely a smaller benefit — it is a genuine loss that a study creates.

Depreciation on a building comes back on sale as unrecaptured section 1250 gain, which is capped at 25%. Depreciation on personal property — the appliances, carpet, cabinetry and removable fixtures a study reclassifies — is section 1245 property, and it comes back at ordinary income rates.

For the high earners who commission these studies, ordinary rates are 32% to 37%. So reclassifying a dollar of building into a dollar of personal property does not only accelerate the deduction; it swaps a recapture capped at 25% for one at up to 37%. On a large reclassification held to a taxable sale, that rate difference can consume a meaningful share of the timing benefit.

It is not a reason to avoid cost segregation. It is a reason the calculation has to include it, and most published comparisons do not.

Two situations remove the recapture cost entirely, and they are exactly the situations serious property investors are usually in.

A 1031 exchange defers the gain, including the recapture, into the replacement property. Roll from property to property and the recapture is never paid, only carried forward. And holding until death gives heirs a stepped-up basis, at which point the accumulated depreciation is wiped out and never recaptured at all. An investor following "swap till you drop" gets the acceleration and never pays for it.

Beyond that, the study has to be worth its fee, which typically runs from a few thousand on a small residential property to tens of thousands on a large commercial one. The break-even figure this calculator reports is the practical test: if the fee quoted exceeds it, the study does not pay.

One further point on timing. A study can be done years after purchase, catching up all the missed acceleration in a single year through a change of accounting method on Form 3115, without amending prior returns. That is often the strongest case of all — an owner three years in can take the entire accumulated adjustment at once.