Customs Audits Uncover Hidden Tariff Costs

Most Companies Overpay Import Duties

Tariffs have become a growing cost for companies that import goods. Yet few companies use customs audits to keep up with complex classification decisions, shifting rules and rate changes.

In one 32-week period, companies faced 23 customs updates that required revisiting classifications and duty calculations.

Few internal teams can track that pace of change without dedicated tools.

The result is a quiet but widespread problem: most companies overpay import duties without realizing it. Industry research shows that 83–85% pay more duties than required, while others underpay and face compliance risk.

Tompkins Ventures helps companies uncover those mistakes. Through customs duty audits and data analysis, our partners identify classification errors, incorrect duty rates and other issues that cause companies to overpay tariffs. In many cases, tariff auditing can recover significant amounts of previously paid duties.

For organizations importing at scale, the financial impact can be substantial.

Why Import Duty Errors Persists Across Supply Chains

Most companies assume their customs process works correctly. They rely on customs brokers and internal teams to classify products and file import entries.

But tariff management rarely sits in one place inside the organization.

Procurement manages suppliers. Logistics manages shipments. Customs brokers file declarations. Finance tracks landed costs. Compliance oversees regulatory exposure.

Each group sees only part of the process. Over time, this fragmentation creates errors that few companies detect.

Tariffs also become more complicated as supply chains grow more global. Products may include materials from several countries, move through multiple locations and enter markets under changing trade rules. Each step adds new classification and duty requirements.

Even strong operations teams struggle to keep all those details aligned.

Where Overpaid Import Duties Actually Come From

Several issues repeatedly appear during import duty audits.

HTS classification errors: Products must be assigned the correct Harmonized Tariff Schedule (HTS) code. Even small mistakes can lead to higher duty rates across thousands of shipments.

Outdated duty rates: Trade policies change frequently. If companies do not update systems quickly, they may continue paying outdated tariff rates.

Broker data inconsistencies: Customs brokers rely on product data provided by the importer. If that information changes or becomes incomplete, classification decisions can drift over time.

Limited visibility across systems: Import data often sits in multiple platforms, including broker portals, ERP systems and freight records. Without a consolidated view, errors can remain buried in the data.

These issues rarely appear in isolation. Most companies experience several at once. That is why leading organizations eventually conduct a structured customs duty audit.

How a Customs Duty Audit Works

A structured import duty audit reviews historical customs entries to determine whether duties were calculated correctly.

The process usually includes four steps.

1. Collecting customs entry data: Specialists gather import records from brokers, logistics systems and financial platforms.

2. Reviewing HTS classifications: Experts examine product classifications to confirm the correct tariff codes were applied.

3. Reconciling duty rates: The audit compares duties paid with the rates that should have applied under current trade rules.

4. Filing recovery claims: When overpayments appear, companies can submit claims to recover the excess duties paid.

Advanced analytics and AI tools allow specialists to review large volumes of import data quickly. This helps identify patterns and discrepancies that manual reviews might miss.

A single audit often uncovers meaningful duty recovery opportunities. But many companies involved in international trade also benefit from ongoing monitoring.

Monthly or quarterly reviews of customs entries can flag classification changes, duty discrepancies and documentation issues before they affect large volumes of shipments.

Over time, this audit process improves tariff classification accuracy, landed cost visibility, import compliance discipline and financial forecasting.

Companies gain a clearer view of what tariffs actually cost across their supply chain.

How Tompkins Ventures Helps Recover Lost Duties

Many companies lack the internal tools or resources to conduct large-scale customs duty audits. Trade compliance teams already manage a wide range of responsibilities, from regulatory monitoring to broker coordination.

Tompkins Ventures connects companies with specialists who focus on customs duty audits and recovery programs.

These partners analyze import data, identify classification errors and manage the process of recovering overpaid duties. They also help organizations strengthen internal processes to reduce future tariff errors.

Tariff rules continue to evolve quickly. Even well-run supply chains can struggle to keep classifications, duty rates and documentation aligned as trade policies change.

Working with specialists allows companies to review large volumes of customs data and ensure they pay the duties they owe – no more and no less.

Tariff Oversight Is a Leadership Issue

Import duties affect more than the compliance department.

Tariffs influence product costs, sourcing strategies and pricing decisions. Errors in duty calculations can quietly reduce margins across entire product lines.

Executive teams should treat tariff oversight as part of broader supply chain governance.

The goal is simple: pay the duties your company owes – and recover the duties it should never have paid.

For many organizations, a structured customs duty audit is the first step toward achieving that clarity.

Related Reading

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• Before You Panic Over Tariffs, Go Beyond the Headlines
• Trump Inauguration Will Change the Supply Chain World

Import Duty Audit FAQs

How do companies know if they are overpaying import duties?

Companies typically discover overpayments through a customs duty audit that reviews historical import entries, HTS classifications and duty rates. Data analysis can identify discrepancies between duties paid and the rates that should have applied.

Can companies recover overpaid tariffs?

Yes. In many cases, companies can file claims with customs authorities to recover duties overpaid due to classification errors or incorrect duty rates.

How often should companies review customs duties?

Leading organizations conduct a full customs duty audit periodically and then monitor import entries regularly to catch errors early.

What causes companies to overpay import duties?

Common causes include incorrect HTS classifications, outdated tariff rates, inconsistent broker data and fragmented import information across multiple systems.