The Tariff Pre-Buy Has a Break-Even

A founder I work with pulled $380K of component inventory forward in Q4 2025. Tariffs on his category were expected to hit 18-22%. Quick math said he'd save $75K on future purchases. He went ahead.

By March, that inventory was still 60% sold through. Cash was $210K lower than his operating plan. He needed payroll covered. His $75K in savings was sitting in a warehouse.

What the napkin math missed

The savings calculation was real. What it didn't capture was the full cost of holding the position.

Warehouse and storage for the oversized inventory position ran $4,800 over four months. The cash used for the purchase would have earned 4.1% in a money market, about $6,200 over the same period. His bank line carried 8.2%. If he'd drawn it to fund the buy, the interest alone was $12,800.

Call it $11,000 to $17,600 to hold, depending on how you count it. Against a $75K tariff save, that's not fatal. But the math was only valid if the inventory turned on plan.

It didn't. Q1 revenue came in 22% below forecast. Now the inventory isn't savings. It's a working capital trap.

What the analysis should have included

Pre-buying ahead of tariffs isn't wrong. There are scenarios where it's exactly right. But the math has to go further than the headline savings number.

Sell-through timing is the variable most companies underweight. How many months to convert this inventory to cash at current sales velocity? Every month it sits, carrying cost accumulates. A pre-buy with a 90-day sell-through is a very different calculation from one that takes 180 days.

Funding cost matters too. Drawing on a credit line, using cash that would otherwise earn yield, depleting reserves below comfortable minimums: all of that has a measurable price. Include it in the break-even before you buy.

Demand risk is the hardest variable to model honestly. A pre-buy matched to signed purchase orders is a different bet from one matched to expected run rate. If the demand that will absorb this inventory is forecast rather than confirmed, that uncertainty belongs in the analysis.

The founders who got this right didn't avoid the decision. They ran more of the analysis before making it.

Where you are if you over-bought

Check the math from the other direction. How long until you've converted this inventory to cash at your current sales pace? Is that timeline compatible with your operating cash needs over the next 90 days?

If not, the options are clear: accelerate sell-through with pricing adjustments, negotiate temporary covenant relief with your bank, or slow non-critical payables to buy time.

Running this now is better than finding out in Q3. Some of those pre-buys will still look smart when the numbers are final. Others already don't. They tend to go wrong quietly until they don't.