A builder calls in February, upset. They spent $900,000 last year building three spec homes. Two are still on the market. The tax return their CPA prepared shows almost no deductions and a modest loss that does not remotely match how much money went out the door.
They want to know what went wrong. Usually, nothing did. That is what correct accounting looks like when you build inventory.
A spec home is not a construction contract
This is the distinction that governs everything else, and it is genuinely different from how contractors are taxed.
When a contractor signs an agreement with an owner to build something, that is a construction contract, and Section 460's long-term contract rules apply — usually percentage-of-completion, with income recognized as the work progresses.
When you buy a lot and build a house that nobody has agreed to buy, there is no contract and no customer. You are producing property held for sale — inventory, in substance. Nothing is recognized until the closing, because until then you have not sold anything. You have just converted cash into a house.
Where the money went: capitalization
Section 263A — the uniform capitalization rules, commonly called UNICAP — requires producers to capitalize into the property they produce both direct costs and an allocable share of indirect costs, rather than deducting them currently.
For a spec builder, that sweeps in a lot:
- The lot itself
- Hard construction costs — framing, concrete, mechanical, finishes
- Permits, impact fees, and utility connections
- Architecture and engineering
- An allocable portion of indirect costs, which can include supervision, storage, and certain administrative costs tied to production
- Construction loan interest allocable to the production period, under Section 263A(f)
All of that goes into basis. None of it is deductible while the home sits unsold. When the home closes, the accumulated basis offsets the sale price and you recognize the gain then — all of it, in that year.
So the deductions are not gone
This is the part that calms most builders down. You have not lost anything. Every dollar capitalized is sitting in the basis of a house, waiting for a closing. The return shows no deduction because the economic event — the sale — has not happened yet.
What you actually have is a timing problem, and timing problems are solvable if you see them coming.
The real risk: the whipsaw
Here is the pattern that hurts. Year one: heavy spending, three homes under construction, minimal deductions, small loss, no tax. Year two: all three close within a few months of each other, and the entire accumulated profit lands in a single tax year — taxed at ordinary rates, subject to self-employment tax, possibly pushing you into higher brackets and triggering underpayment penalties because your estimated payments were built on year one.
Spread across two years, the same economics produce a meaningfully smaller tax bill. Compressed into one, they do not.
The fix is not clever. It is planning against the closing calendar rather than the spending calendar — knowing in September which homes are likely to close before December 31, and making estimated payments that reflect that rather than last year's return.
The small business exception, and outgrowing it
There is an exception to UNICAP for taxpayers under an average annual gross receipts threshold. Many small builders qualify and reasonably operate under simpler rules.
The trouble is that the threshold is measured on a rolling average, and a builder who has a strong couple of years can cross it without any signal. The first indication is often a CPA discovering the problem two years later, at which point the correction is a formal accounting method change, not an adjustment.
If your gross receipts have grown substantially, this is worth checking annually rather than assuming last year's answer still applies.
Allocating subdivision costs
One more capitalization issue that distorts more returns than it should: common development costs. Streets, drainage, utilities, engineering, entry monuments — these benefit every lot in a subdivision and have to be allocated across the lots benefited, typically by relative fair market value or by lot count depending on facts.
Builders who expense common costs as incurred, or who dump them into the first home sold, misstate gain on every closing in the neighborhood. Usually the early sales are overtaxed and the later ones undertaxed — which means an amended return problem later and an unnecessary tax payment now.
What to do
Set up a cost ledger per home from lot acquisition forward. Capture hard costs, soft costs, allocated common costs, and capitalized interest against each address. At closing, you will know the actual gross margin on that house — which is useful for tax and far more useful for deciding what to build next.
Then plan the tax against closings. That is the whole job.
We handle per-home inventory accounting, UNICAP compliance, and interest capitalization for builders across Texas. More on working with spec home builders.