Section 232 Tariffs on Steel, Aluminum, and Copper: A Small Business Guide

A small manufacturer imports $10,000 worth of steel coil. Under the old rules, the tariff might have applied to just the portion of that value tied to the raw metal. Under the rules that took effect in April 2026, the full $10,000 gets taxed at 50%. That's a $5,000 duty bill on a shipment that used to cost thousands less to land — and a lot of small businesses are finding out the hard way, when a customs broker's invoice arrives higher than expected.

If you import steel, aluminum, or copper — or buy products made from them, from patio furniture to electrical components to HVAC parts — the last few months have changed the math on what those goods actually cost to bring into the country. Here's what changed, why it matters even if you've never filled out a customs form yourself, and how to keep your books from lying to you about your real margins.

What Actually Changed​

Section 232 tariffs on steel and aluminum have existed since 2018, and copper joined the list more recently. But a presidential proclamation signed April 2, 2026, and effective April 6, 2026, restructured how these tariffs are calculated — and a follow-up proclamation on June 1, 2026 (effective June 8, 2026) adjusted the rates further.

The headline change is this: tariffs on covered metal products, and on derivative products made from them, now apply to the full customs value of the item — not just the value of the metal content.

Previously, if you imported a derivative product like a metal bracket or a pipe fitting, customs would try to split the declared value between the metal portion and the non-metal portion (plastic housing, labor, packaging, whatever), and only tariff the metal share. That system is gone. Now the entire declared value of the product gets the tariff rate applied to it, with very limited exceptions.

The New Rate Structure​

• 50% — steel articles, aluminum articles, most copper articles, and derivatives that are almost entirely made of the covered metal (coils, sheet, rod, bar stock)
• 25% — derivative products that are substantially made of the covered metal, like pipe fittings and structural parts
• 15% — a transitional rate (through December 31, 2027) for certain metal-intensive equipment, including some agricultural equipment, residential HVAC systems and components, and industrial machinery
• 10% — derivative products made entirely from steel that was melted and poured (or aluminum that was smelted and cast) in the United States, when properly documented — the domestic-content threshold was lowered from 95% to 85% as of June 8, 2026
• 0% — products where the covered metal makes up less than 15% of the total customs value are exempt from the Section 232 metals tariff entirely

That last exemption sounds like a relief valve, but it's a narrow one. A product with 16% steel content by value gets the full tariff on 100% of its value — there's no partial credit. Products sitting close to that 15% line are worth a hard second look, because a small change in sourcing or design could mean the difference between owing nothing and owing 25–50% on the whole invoice.

A Worked Example​

Say you run a small furniture business and import steel patio chairs at $200 per unit, where the steel frame accounts for $60 of the manufacturing cost (30% of value). Before the April 2026 change, you might have owed 50% on roughly the $60 metal share — about $30 per chair. Under the current rules, if the product is classified as a derivative substantially made of steel, you owe the tariff on the full $200 value. At 25% (typical for a derivative like this), that's $50 per chair — and at 50%, it's $100. Either way, it's a meaningfully bigger number than the old metal-content-only calculation, and it changes your landed cost per unit by real money at volume.

New HTS Classifications to Watch​

As of June 8, 2026, four new tariff classifications were added that pull previously uncovered products into Section 232 scope, including certain lithographic plates and specific categories of steel furniture. If you import furniture, printing supplies, or adjacent product lines, don't assume your historical classification still applies — check whether your HTS codes changed under the updated Chapter 99 headings.

The Two-Line Filing Trap for USMCA Goods​

If you import derivative steel products from Canada or Mexico and want to claim USMCA preferential treatment on the U.S.-origin content, the filing rules require two separate line items on the entry: one reporting the non-U.S. content at the standard rate, and one reporting the U.S.-origin content (capped at a defined percentage of total value) at a reduced or zero rate. Filing this as a single combined line is a common mistake, and it can get an entry rejected or flagged for correction. If you use a customs broker, confirm they're aware of this split-reporting requirement — it's easy for it to get missed on routine shipments.

Common Mistakes That Trigger Delays or Penalties​

Customs brokers and trade compliance firms report the same handful of errors showing up repeatedly since the April 2026 change:

• Assuming a borderline product qualifies for the under-15% exemption without documentation. A product with 14% metal content by value isn't automatically exempt — customs can still challenge the claim at entry if there's no paper trail showing how that percentage was calculated.
• Still using the pre-2026 domestic-content threshold. Some importers are still requiring 95% U.S.-origin metal content to claim the reduced rate, unaware the threshold dropped to 85% as of June 8, 2026 — which means some products that didn't qualify before now do.
• Filing a single combined line for mixed-origin USMCA goods. As covered above, this is a frequent rejection trigger for Canadian and Mexican derivative steel shipments.
• Not tracking where metal was melted, poured, smelted, or cast. Country of origin for tariff purposes isn't always the same as the country you bought the finished product from — customs wants to know where the raw metal itself was processed, and that information has to be tracked in your entry filings.
• Continuing to use outdated tariff classifications. Products that fell outside Section 232 scope before June 2026 — certain lithographic plates and steel furniture categories among them — now require updated HTS codes and duty calculations.

Any one of these can turn a routine shipment into a customs hold, a post-entry correction, or in the worst case, a penalty assessment. None of them are hard to avoid once you know to look for them — which is exactly why it's worth a conversation with your customs broker now rather than after your next shipment gets flagged.

Who Gets Hit by This Beyond Obvious Metal Importers​

It's easy to assume Section 232 tariffs are a problem for steel mills and metal distributors, not the kind of small business reading an article like this one. In practice, the reach is much broader. Businesses affected include:

• Furniture retailers and manufacturers sourcing steel-frame or aluminum-frame products, now that specific furniture categories were added to Chapter 99 coverage in June 2026
• HVAC contractors and equipment resellers, some of whom now qualify for the transitional 15% rate on residential systems and components
• Agricultural equipment dealers, also newly eligible for that same transitional rate
• Construction and industrial equipment businesses buying metal-intensive machinery
• E-commerce sellers who private-label or import housewares, tools, or hardware with metal components, even when the metal isn't the headline feature of the product
• Any business buying from a domestic distributor who themselves imports covered metal — the cost increase gets passed down the supply chain whether or not you ever see a customs form

If your supply chain touches imported steel, aluminum, or copper at any point — even two or three suppliers removed from the original import — there's a reasonable chance your costs have shifted since April 2026, whether or not anyone has flagged it for you yet.

Why This Matters Even If You Don't File Customs Paperwork Yourself​

Most small business owners who deal with these tariffs never touch a customs entry form — a freight forwarder or customs broker handles that. But the tariff still shows up in your business in a few predictable ways:

• Your supplier invoices go up. If you buy from a domestic distributor who imports the raw material or components, expect a price increase passed through, even if you never see the word "tariff" on your own invoice.
• Your landed cost per unit changes. If you're doing your own cost accounting for pricing decisions, a landed cost model that was built before April 2026 is now stale. The tariff line item on a customs entry can be a bigger number than it used to be for the exact same product.
• Documentation requests increase. If you're the importer of record, expect your broker to ask for more detailed sourcing information — where the metal was smelted or melted and poured, what percentage of the finished good's value it represents, and supplier certifications backing that up.

What Small Manufacturers and Importers Should Do Now​

1. Get your landed cost model current. If a spreadsheet or ERP system is calculating what a product actually costs to land in the U.S., make sure the tariff assumptions reflect the current rate structure, not the pre-April 2026 metal-content-split method.
2. Ask suppliers for documentation, not just a price. If any of your products might qualify for the reduced 10% U.S.-origin rate, or the 15% transitional rate for qualifying equipment, you need supplier certifications proving it — after the fact is too late.
3. Check products near the 15% metal-content line. If a product's metal content is close to that exemption threshold, a small sourcing or design change might move it from "fully tariffed" to "exempt," or vice versa. It's worth running the math both ways.
4. Keep records for years, not months. Customs can audit entries retroactively — typically a multi-year window. Metal sourcing certificates, composition documentation, and supplier declarations should be filed and retrievable, not just handed to your broker and forgotten.
5. Watch the transitional deadlines. The reduced 15% rate for certain equipment categories is temporary, running through December 31, 2027. If you're pricing multi-year contracts or long-lead-time equipment purchases, factor in that the rate is scheduled to change.

Where This Connects to Your Books​

The real danger of a tariff change like this isn't the paperwork — it's that your cost accounting quietly goes stale while your pricing stays the same. If your landed cost assumptions were set before April 2026 and haven't been revisited, you could be underpricing products, eroding margin on every unit sold without realizing it until a slow quarter forces you to look closely at the numbers.

This is exactly the kind of thing that's easy to miss when your books live in a black-box tool that summarizes totals but hides the detail. Recording each shipment's landed cost — including duty line items — as its own transaction, in a format you can actually query and audit, makes it obvious when a cost category jumps. You don't want to discover a tariff-driven margin squeeze the same way you discover it in this article: after the fact, from a broker's invoice.

Simplify Your Financial Management​

Tracking landed costs, tariff line items, and margin by product line gets messy fast when the rules keep changing underneath you. Beancount.io offers plain-text accounting that gives you complete transparency into every transaction — no black boxes, no vendor lock-in, and records you can audit line by line as import costs shift. Get started for free and see why developers and finance professionals are switching to plain-text accounting.