Blackstone Import Partners recovered $127,500 on Korean processor ICs after broker filed the CN Section 301 stack on a KR-origin KORUS-qualifying shipment
Case study, 2026-07-26 entry, HS 8542.31.00 monolithic processor ICs from Korea. LandedFees flagged the origin-tag error and secured the KORUS preferential rate via CAPE PSC.
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On 2026-07-26, an electronics-parts importer filed CBP 7501 entry for 20,000 units of monolithic processor integrated circuits (HS 8542.31.00) from a Cheongju fab. Declared unit value: $85.00 CIF. Declared customs value: $1,700,000. Air freight, port of entry Los Angeles International.
The broker's SKU master had the part tagged as CN origin from a prior year when the importer sourced from a Shanghai IDM. The move to the Korean fab was completed in Q1 2026 but the tag was never migrated. Broker filed the entry with the CN origin and the full CN stack: Section 301 baseline 7.5 percent, Section 301 forced-labor overlay 12.5 percent, no KORUS preference.
Broker-recorded total landed cost: $2,049,276.50.
What the LandedFees audit engine detected
HS 8542.31.00 (processor ICs, monolithic, digital) is a Chapter 85 semiconductor line. Under KORUS the special-column rate is 0 percent duty for KR-origin qualifying goods.
- CN origin stack: 0% MFN + 7.5% S301 baseline + 12.5% S301 forced-labor overlay = 20% total, or $340,000 on $1,700,000
- KR origin with KORUS claim: 0% MFN + 0% S301 (not applicable) + 12.5% S301 forced-labor overlay = 12.5% total, or $212,500 on $1,700,000
Delta: 7.5 percentage points, $127,500.
The audit engine detected the CN-vs-KR mismatch by cross-checking the master air waybill origin (ICN, Incheon) against the broker's declared origin (PVG, Shanghai) on the entry summary. The two did not reconcile. The engine flagged the entry for origin verification.
Corrected filing (LandedFees engine, with KORUS)
| Line | Filed (broker, CN stack) | Actual (audit engine, KR + KORUS) | Delta |
|---|---|---|---|
| MFN (0%, semiconductor) | $0 | $0 | $0 |
| Section 301 baseline (7.5%, CN only) | $127,500 | $0 (not applicable to KR) | -$127,500 |
| Section 301 forced-labor overlay (12.5%) | $212,500 | $212,500 | $0 |
| MPF (0.3464%, capped) | $651.50 | $651.50 | $0 |
| HMF (n/a air) | $0 | $0 | $0 |
| Customs bond premium | $8,500 | $8,500 | $0 |
| Broker fee | $125 | $125 | $0 |
| Total landed cost | $2,049,276.50 | $1,921,776.50 | -$127,500.00 |
Numbers taken directly from the LandedFees engine on 2026-07-27. Full transcript in content/_case-study-numbers/blackstone-import-partners-kr-us-semiconductors-korus-stack.json.
Regulatory basis for the correction
The Korea-US Free Trade Agreement (KORUS, effective 2012-03-15, updated 2019) provides duty-free treatment for KR-origin goods meeting the agreement's rules-of-origin criteria. For HS 8542.31 the relevant rule is a change from any other subheading within the same chapter (CTSH) plus a substantive processing test satisfied by wafer fabrication in Korea.
Section 301 baseline duties under the 2018 USTR determination attach exclusively to Chinese-origin goods. A KR-origin shipment does not trigger the baseline regardless of the HS code. The 12.5 percent forced-labor overlay (effective 2026-07-24) attaches to non-USMCA, non-KORUS, non-preference origins including KR when the KORUS claim is not made, but is exempted when KORUS applies to the specific line under the special-column rate.
For an entry where the correct KR origin + KORUS claim produces a 12.5 percent burden vs the wrong CN classification producing 20 percent, the delta is 7.5 percentage points.
Filing path
The importer filed a CAPE PSC on 2026-07-28 (day 2 from entry summary). PSC package:
- Amended entry summary declaring KR origin.
- Master air waybill and house waybill confirming Incheon loading.
- Korean manufacturer's certificate of origin under KORUS Article 6.1.
- Wafer-fab process description supporting the KORUS ROO tariff-shift test.
- SKU-master update memo (broker attestation).
PSC accepted 2026-08-15. Refund landed 2026-09-02.
Timeline
- 2026-07-26 entry summary filed with CN origin.
- 2026-07-27 LandedFees audit engine flagged the origin-vs-waybill mismatch.
- 2026-07-28 broker filed CAPE PSC with KR origin + KORUS claim.
- 2026-08-15 CBP accepted the PSC.
- 2026-09-02 refund of $127,500.00 landed to importer ACH.
Why this happens
Semiconductor supply chains reshuffled dramatically in 2024 and 2025 as importers diversified out of concentrated CN sources into KR, TW, and JP fabs. Broker SKU masters that were built during the CN-dominant era carry legacy origin tags that no longer match physical shipment origins. The mismatch surfaces only at CBP audit or through a post-entry review.
Under the current Chapter 99 stack (S301 baseline for CN, S301 forced-labor overlay for non-preference origins), the delta between a correct KR + KORUS filing and an erroneous CN filing is 7.5 percentage points. On semiconductor value density that is $127,500 per $1.7M shipment. On a mid-market importer's typical 100+ semiconductor entries per year the aggregate exposure runs into the low seven figures.
The LandedFees audit engine reconciles the master waybill origin, the manufacturer country on the commercial invoice, and the broker's SKU-master tag on every entry. Any two-way mismatch surfaces within 24 hours.
Run the same audit on your last 30 days of entries at landedfees.com/audit.
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