When the Rules Change Overnight

The Section 122 tariffs expire on July 24. Your supply chain will need to recalculate everything. Is your operations team ready to do it in hours instead of weeks?

By Kelly Breakstone Roth, Co-Founder & CEO of Prysmic · April 2026 · 8 min read

On February 20, 2026, the Supreme Court struck down the IEEPA tariffs that had defined U.S. trade policy for nearly a year. Within hours, they were replaced with a new import surcharge under Section 122 of the Trade Act of 1974, initially set at 10% and later raised to 15%, the statutory maximum (WilmerHale, 2026; White House, 2026).

Section 122 comes with a built-in constraint: it can only remain in place for 150 days without congressional authorization. That clock started on February 24. It expires July 24, 2026 (Global Trade Alert, 2026).

What happens next is uncertain. The tariffs could lapse, be extended, or be replaced with an entirely different regime. There is no confirmed path.

What is certain is this: another policy shift is coming.

This is not unusual anymore. The February ruling wasn't phased in. It happened in real time. One tariff regime was invalidated and another was introduced within hours. Shipments already in transit were suddenly subject to a different cost structure. Operations teams weren't planning for the change; they were reacting to it as it happened.

That is the environment July 24 sits inside.

The cost of recalculation

When tariff rates change, the impact doesn't stop at the cost of goods. It ripples outward, hitting every system that touches landed cost.

Classifications need to be rechecked. Duty rates need to be updated. Landed cost models have to be recalculated. Purchase orders already in transit may no longer reflect reality. Contracts that assumed one rate are suddenly based on another.

None of this happens in one place. It plays out across systems that don't update at the same time, each holding part of the picture.

So teams don't just apply a new rate. They have to track down where the old one still lives, and bring everything back into alignment.

The last time this happened, companies had no lead time. The ruling came down, the policy shifted, and the recalculation started immediately. Teams were adjusting costs while shipments were already moving, making decisions on inputs that were changing underneath them.

Where this shows up in practice

The pressure comes not only from the policy, but from the lag in reflecting it across the organization.

If a rate changes but only one system updates, decisions are made on partial information. If classifications are out of sync with current rules, the issue may not surface until after the fact. If cost models lag behind what is actually being paid, pricing and margin decisions drift without anyone immediately seeing it.

None of this may be dramatic on its own. But it accumulates.

The longer it takes to bring systems back into alignment, the longer the business operates on a version of reality that is already outdated.

Over the past year, the common response has been to diversify sourcing away from China. Companies have done exactly that. In 2025, 43% of supply chains shifted sourcing locations (QIMA, 2026).

That reduced concentration risk. It did not reduce operational complexity.

Every new sourcing country brings its own classifications, duty structures, documentation requirements, transit timelines, and carrier relationships. A company that once managed one tariff environment now manages several in parallel.

When something changes, they are not recalculating one system. They are recalculating across multiple geographies, partners, and data models. Often without a single place where those changes reconcile cleanly.

Diversification spread the exposure. It also multiplied the amount of coordination required to manage it.

From optimization to response time

For decades, supply chain strategy was built around optimization. Find the lowest cost. Negotiate the best rate. Lock in long term contracts. Minimize variance.

That model assumed relatively stable rules.

Today, the constraint is not just what the tariff is. It is how quickly the business can absorb the change when it moves.

Some organizations are still operating on a cycle where a policy change triggers a manual reset. Data is pulled from multiple systems, reconciled, validated, and then used to make decisions. That process takes time, and during that time the underlying assumptions may already be shifting again.

Others have shortened that cycle. When a rate changes, the impact is reflected across purchase orders, cost models, and pricing decisions without waiting for a full rebuild. When leadership asks how margins change under a different scenario, the answer is available immediately, not after days of analysis.

The difference shows up in very concrete ways.

In one case, a tariff update leads to a backlog of work before any decision can be made. In the other, the decision happens while the change is still fresh.

That gap compounds.

It determines whether a company is reacting to change after it has already hit the P&L, or adjusting in time to shape the outcome.

July 24 is not the last change

The expiration of Section 122 will draw attention because it has a fixed date. But it is one moment in a sequence that has been accelerating.

Trade policy is changing more frequently, and the time to respond has compressed. The February ruling made that visible by collapsing what used to be phased adjustments into a single day.

Companies have responded by restructuring their supply chains. Most have added flexibility at the network level. Fewer have made equivalent changes to how their operations absorb and process change.

That mismatch is where the risk sits.

Not in any single tariff decision, but in the repeated need to translate policy into operational reality, under time pressure, across systems that were not designed to move that quickly.

July 24 will come and go. Whatever replaces Section 122 will become the new baseline. And then it will change again.

The companies that struggle will not be the ones that misunderstood the policy. They will be the ones that needed time to reconcile it.

And in this environment, time is the one thing the policy does not give you.