One Clause on Page Six Flips a $300,000 Deduction

Pull up Form 4562. Part II. Line 14. This is where your bonus depreciation lives. The form asks for a dollar amount. It does not ask when you signed the contract.

That missing box is a $300,000 problem.

Here is the rule. Congress passed the One Big Beautiful Bill in July 2025. It brought back 100% bonus depreciation for property acquired on or after January 20, 2025. If you signed a binding contract before that date, you’re stuck with the old rate. For 2025, the old rate is 40%.

The date that matters is the handshake. Not the delivery truck.

Look. Let me walk you through what happens.

You run a machine shop. In December 2024, you signed a contract for a $500,000 piece of custom equipment. The manufacturer started building it in February. It showed up on your floor in June. You plugged it in on July 1.

You think: new law, 100%, write off the whole thing. The form doesn’t stop you. Line 14 takes whatever number you type. There’s no field that says “when did you sign?”

But the contract in your filing cabinet says December 2024. Before the cutoff. Baker Tilly walked through a nearly identical scenario in its analysis of the OBBBA transition rules: a taxpayer enters a binding contract for custom equipment before January 20, 2025, the manufacturer begins building it afterward, and the equipment is placed in service months later. The acquisition date is the contract date, not the delivery date. The old phase-down rate applies.

Right. Your deduction is $200,000. Not $500,000. The machine is on your floor. The write-off is in a drawer.

And your software won’t catch it either. Thomson Reuters Fixed Assets CS auto-applies 100% to any asset with an acquisition date after January 19. But it uses whatever date the preparer enters. If your bookkeeper enters the placed-in-service date instead of the binding contract date, the software says “great, 100%.” No flag. No question. Garbage in, garbage out.

So now some firms add a “binding contract date” column to their fixed asset ledgers. The column doesn’t exist on the form. It doesn’t exist in the software. You build it yourself or it doesn’t exist.

Here’s where it gets interesting. I mean, really interesting.

The IRS says a “binding contract” is one that’s enforceable under state law and doesn’t cap damages at a fixed amount. The safe harbor: if the cap is at least 5% of the total contract price, the IRS won’t treat it as limiting damages. The contract is binding. Below 5%, it may not qualify.

You signed a $500,000 contract in December 2024. You think you’re locked at 40%. But your contract caps liquidated damages at $20,000 if you breach. That’s 4%. Below the line. The IRS could treat that contract as not binding. Which means you didn’t “acquire” the property until you took delivery. After the cutoff. Hello, 100%.

One clause. Buried on page six of a contract you signed twenty months ago. It could flip your deduction by $300,000. And the form never asks.

Sure, Section 179 can cover some of the gap. It uses the placed-in-service date, not the contract date. So if you’re stuck at 40% on bonus, you can stack Section 179 on top. Claws back part of the difference.

But here’s the trap. Right? The IRS uses something called DIF scoring to rank returns for audit. Big first-year deductions jump off the page. You claim $500,000 on a brand-new asset and your taxable income drops to zero? That scores high. An auditor pulls your return. They don’t look at Line 14. They look at the contract in your cabinet.

The form accepted the number. The form never asked where it came from. The auditor will.

The form won’t tell you. The software won’t tell you. The contract will.

It’s in the drawer. The liquidated damages clause is on page six. That one percentage decides whether the deduction is $500,000 or $200,000.

The form never asked.