Section 338 Canada T-6 to August 19: CBP PSC Review Capacity Forecast, 90 to 120 Day Post-Cliff Turnaround, and Working Capital Planning for Importers

Section 338 Canada is T-6 to 12:01 AM EDT August 19 2026. CBP CSMS still not published as of this morning per trade advisories. For Canadian importers running entries in the days after the cliff, the two operational forecasts brokers are running right now are about PSC review capacity and CAPE Phase 2 timing, not about the underlying duty math.

The Pre-Aug 19 PSC Baseline

The typical CBP Post Summary Correction review turnaround at most large US ports pre-Aug 19 2026 was 30 to 60 days. Ports with dedicated PSC review lines (LA/LB, NY/NJ) trended toward the lower end at 30 to 45 days. Ports without a dedicated line (Gulf, Great Lakes, some Northeast) trended toward the upper end at 45 to 60 days. This baseline was already stretched by post-Jul 24 Section 301 forced-labor tier-assignment corrections which added an estimated 15 to 25 percent PSC volume across most ports.

The Post-Aug 19 Volume Math

Approximately 45,000 to 55,000 Canadian-origin entries clear US customs per week at pre-Aug 19 volumes. Based on how Section 122 rolled out February 24 2026, an estimated 8 to 12 percent of Canadian entries will require PSC correction in the first 60 days post-effective for Chapter 99 heading misassignment or classification errors. That is 3,600 to 6,600 additional PSC filings per week on top of existing volume.

Applied to the same officer queue already processing S301 forced-labor PSCs, ports without a dedicated PSC line likely slide from the pre-cliff 45 to 60 days to 90 to 120 days. Ports with dedicated lines likely slide from 30 to 45 days to 60 to 90 days.

Why CAPE Phase 2 Does Not Help Here

CAPE Phase 2 launched April 20 2026 with a July expansion to reconciliation-flagged entries, pending ADD/CVD determinations, and rate-assignment pending entries. The Phase 2 unlock helps entries that are legitimately unclosed pending underlying determinations by allowing PSC filings before the underlying determination completes. It does not accelerate the review timeline for straight classification-correction PSCs.

The volume S338 will produce is primarily straight classification correction (Chapter 99 heading mis-applied at entry summary), not reconciliation-flagged. Phase 2 helps a subset of S338 corrections where the entry is also flagged for reconciliation (USMCA post-entry claims, first-sale valuation), but for the primary S338 misclassification volume Phase 2 changes filing eligibility not review timeline.

500k CIF Ontario Furniture Worked Scenario

Consider a 500,000 dollar CIF value shipment of wooden furniture from Ontario under HTS 9403.30, Canadian origin, cleared post-Aug 19 without S338 Chapter 99 heading assigned at entry summary because the broker was waiting for CBP CSMS.

At entry: base HTS 9403.30 duty at USMCA-preferential 0 percent = 0 dollars. MPF at 0.3464 percent capped at 634.62 = 634.62. HMF at 0.125 percent on CIF = 625. Total assessed at entry = approximately 1,260 dollars.

Post-entry correction: Section 338 at 50 percent ad valorem on CIF = 250,000 dollars additional duty owed. Broker files PSC in CAPE Phase 2 with amended entry summary.

Pre-cliff turnaround (30 to 45 days at a dedicated PSC port): refund of the overpayment portion (if any) lands within approximately 45 days of PSC filing. Note that for S338 the PSC direction is typically the importer OWING more, not being owed a refund, so the working capital analysis inverts here.

For a different scenario where an importer paid the 250k S338 upfront (Chapter 99 heading assigned at entry) then identifies through classification review that a Chapter 99 exemption applies (for example, a specific carve-out for the HTS 9403.30 subheading), the PSC direction is refund-owing.

Under the pre-cliff 45-day turnaround: 250k refund lands day 45. Working capital cost at 10 to 12 percent SME line-of-credit APR = 45/365 x 0.11 x 250,000 = approximately 3,400 dollars.

Under the post-cliff 105-day forecast: 250k refund lands day 105. Working capital cost at same APR = 105/365 x 0.11 x 250,000 = approximately 7,900 dollars. Delta = 4,500 dollars in additional carrying cost per PSC filing.

Over a 12-month S338 exposure window with an importer filing 20 to 30 such PSCs, the cumulative carrying cost delta is 90,000 to 135,000 dollars. That is real money not currently reflected in most brokers' pre-cliff cost-of-compliance conversations with importers.

Port-Level Exposure

Ports processing high Canadian-origin volumes without dedicated PSC review lines are most exposed. Detroit ranks highest at 15 to 20 percent of Canadian entries and no dedicated PSC line. Great Lakes ports (Cleveland, Milwaukee, Duluth), Buffalo-Niagara, Champlain-Rouses Point, Port Huron, Sault Ste. Marie, and Northeast ports (Boston, Providence) round out the top exposure list.

LA/LB and NY/NJ have dedicated PSC lines and lower Canadian-origin volume shares so are less exposed. Seattle-Tacoma has significant Canadian volume via I-5 and Blaine crossings but has a dedicated PSC line, so exposure is medium.

Importers with entries clearing through Detroit, Great Lakes, or Northeast land-border ports should plan for the upper end of the 90 to 120 day forecast. Importers clearing through Pacific ports or NY/NJ should plan for the 60 to 90 day range.

Practical Filing Sequence

Once an S338 misclassification is identified in the days after August 19:

1. Document the correct Chapter 99 heading assignment with citation to the specific Section 338 Proclamation (July 20 2026, three separate proclamations) and any published CBP CSMS message.
2. Prepare the amended CBP Form 7501 with the corrected Chapter 99 heading, corrected duty calculation, and updated MPF/HMF as applicable.
3. File CAPE PSC through the broker's ACE credentials as soon as the correction package is complete, without waiting for CSMS. CSMS provides operational guidance but does not create the legal basis for the correction.
4. If the entry has an FTZ Privileged Foreign election on Form 214, include the PF election documentation, admission log, and any 19 CFR 146.3 escalation letter to the port director.
5. Track review timeline against port baseline. If the review exceeds 120 days at a non-dedicated-line port or 90 days at a dedicated-line port, escalate to the port director for status.
6. If CBP rejects the PSC on documentary grounds, refile with CSMS citation and additional supporting documentation within 30 days. Refiling preserves the original filing intent for statute-of-limitations purposes.
7. If CBP fails to respond within 180 days of PSC filing, evaluate whether to escalate to 19 CFR 174 protest at liquidation (once liquidation lands) or continue tracking the PSC review.

The Broker Conversation

Post-Aug 19 importers should ask their brokers three questions to calibrate expectations.

First, does the broker have direct filing access to CAPE Phase 2 or does the broker sub-contract PSC filings? Direct filing shortens the internal broker turnaround by 5 to 10 days.

Second, what is the broker's port-level PSC turnaround experience in the last 90 days? Brokers with clearance activity at multiple ports can compare Detroit or Great Lakes turnarounds against LA/LB or NY/NJ.

Third, does the broker maintain a PSC filing queue that batches similar corrections (all S338 corrections filed on the same day for a given importer) versus filing individually? Batched filings sometimes receive port-level review as a group, which can shorten per-filing review time.

Working capital planning for S338 PSC exposure post-Aug 19 should assume the 90 to 120 day forecast at non-dedicated-line ports, not the pre-cliff 30 to 60 day baseline. The volume math points in one direction only.

What is your port's current PSC turnaround baseline?