--- title: U.S. Tariff Adjustments in Calculating Stackable Tariffs description: A review of how to get relieve from Trump tariffs that were adding upon each other. Unstacking tariffs. image: https://www.jetworldwide.com/hubfs/non-stackable-tariffs-usa-2025.webp --- [![jet worldwide parcel delivery service](https://www.jetworldwide.com/hs-fs/hubfs/Jetship-jetworldwide-logo.webp?width=50&height=27&name=Jetship-jetworldwide-logo.webp "jet worldwide parcel delivery service")](https://jetworldwide.com) ### Jet Worldwide Blog Connecting people, parcels, and businesses around the world! ![chart showing a list of stackable tariffs to USA](https://www.jetworldwide.com/hubfs/non-stackable-tariffs-usa-2025.webp) # U.S. Tariff Adjustments in Calculating Stackable Tariffs [ Jet Team ](https://www.jetworldwide.com/blog/author/jet-team) Note: This post is no longer current since the Supreme Court ruled the IEEPA tariffs invalid. ## [Section 122 tariffs](https://www.jetworldwide.com/blog/u.s.-tariff-update-navigating-the-shift-from-ieepa-to-section-122) ## Do you have to pay duty on duty? The anti-dumping/ countervailing tariffs imposed recently include: - 25% on certain automobiles (April 2025) - 25% on auto parts (May 2025) - 50% tariffs on select Canadian and Mexican aluminum and steel products This latest EO "unstacks" certain tariffs. Multiple rates of duty will no longer apply in some cases. [Protect your rights to get a refund on IEEPA Tariffs](https://www.jetworldwide.com/blog/protecting-importers-rights-recovering-duties-if-ieepa-tariffs-are-struck-down) ![Stackable-USA-tariff-chart-Jetship-Canada-2025](https://www.jetworldwide.com/hs-fs/hubfs/Stackable-USA-tariff-chart-Jetship-Canada-2025.webp?width=960&height=608&name=Stackable-USA-tariff-chart-Jetship-Canada-2025.webp) Understanding "Stackable Tariffs." Initially, the many Trump tariffs were designed to stack: E ach new duty was applied on top of existing ones. For example: - Base duty (MFN rate):2.5% - Section 301 tariff: 25% - IEEPA fentanyl tariff: 20% - IEEPA reciprocal tariff: 125% - Total duty:172.5% ### Key Changes to Stackable tariffs: The EO removes the stacking effect for certain tariffs, including: Auto/Auto Parts (Section 232 tariffs) – No longer subject toCanada/Mexico fentanyl, aluminum/steel, and fentanyl-related - Before: Auto part (HTS 8708.99.6890) =25% (auto tariff) + 25% (aluminum tariff) = 50% - Now : Only 25% auto tariff applies. ![us-customs-stackable-tariffs-2025](https://www.jetworldwide.com/hs-fs/hubfs/us-customs-stackable-tariffs-2025.webp?width=586&height=838&name=us-customs-stackable-tariffs-2025.webp) ## Getting relief from previously paid stackable tariffs Getting refunds for duty paid back from March 4, 2025 will be possible. Importers can claim refunds for overpaid stacked tariffs.Also, there will be no need for country-of-melt/cast reporting on certain auto parts. As of  August 2025, CBP Form 7501 includes Section 232 data elements: - 21: COUNTRY OF MELT AND POUR - 22: PRIMARY COUNTRY OF SMELT - 23: SECONDARY COUNTRY OF SMELT - 24: COUNTRY OF CAST ![updated 7501 customs form](https://www.jetworldwide.com/hs-fs/hubfs/updated%207501%20customs%20form.jpeg?width=800&height=314&name=updated%207501%20customs%20form.jpeg) ### Custom's ACE System not able to handle Stackable Tariffs US custom's Automated Commercial Environment (ACE) system faces challenges is not designed to handle more thanb two overlapping tariffs. When tariffs are unstacked or modified retroactively (like this EO), ACE requires manual updates, leading to delays.Updates to The Harmonized Tariff Schedule (HTSUS) will take several weeks- expected by mid May, 2025 Limited Automation for Refunds– Importers often must filePost Summary Corrections (PSCs)or protests to reclaim overpaid duties, adding administrative work. --- [![Get a shipping quote](https://no-cache.hubspot.com/cta/default/213869/b8064d2c-d3cb-4934-ae43-2dc1f71ab67d.png)](https://cta-redirect.hubspot.com/cta/redirect/213869/b8064d2c-d3cb-4934-ae43-2dc1f71ab67d)   [stackable tariffs](https://www.jetworldwide.com/blog/topic/stackable-tariffs), [unstacking trump tariffs](https://www.jetworldwide.com/blog/topic/unstacking-trump-tariffs) #### Please subscribe to stay up to date on parcel delivery news. 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