INTERNATIONAL TRADE LAW
GSP vs. MFN: Tariff Preferences Explained
Most-favored-nation (MFN) treatment is the baseline tariff rate a country charges nearly all its trading partners; the Generalized System of Preferences (GSP) is a special program that lets eligible developing countries ship certain goods in below that baseline — often duty-free. MFN is the rule; GSP is an exception layered on top of it. For an importer, the difference decides what duty rate actually applies at the border.
What “Most Favored Nation” Means
MFN is a core principle of the World Trade Organization, set out in Article I of the GATT: a member that grants a tariff advantage to one trading partner must extend the same advantage to all other members. The name is misleading — it does not mean special favoritism. It means non-discrimination: treat everyone alike at the most favorable rate you offer anyone.
In U.S. law, MFN treatment goes by a different name — Normal Trade Relations (NTR), and where it is made permanent for a country, Permanent Normal Trade Relations (PNTR). Goods from countries that have NTR enter at the standard “Column 1” tariff rates in the Harmonized Tariff Schedule. Goods from the small set of countries without NTR pay the much higher “Column 2” rates.
That second column is not theoretical. In April 2022, Congress suspended normal trade relations with Russia and Belarus, moving their goods to Column 2 rates, where they remain pending the conditions for restoration. A handful of other countries, such as Cuba and North Korea, also sit outside NTR. For most of the world, though, MFN/NTR is the everyday baseline.
What the Generalized System of Preferences Does
GSP is a unilateral, non-reciprocal preference program. A developed country grants reduced or zero tariffs on selected products from eligible developing countries — and asks for nothing in return. The goal is to help those economies grow by giving their exports better access to large markets. To stay eligible, beneficiary countries typically have to meet conditions on issues like worker rights, rule of law, and protection of intellectual property, and sensitive product categories are usually excluded.
Here is the part importers most need to know in 2026: the U.S. GSP program is currently lapsed. Its statutory authorization expired on December 31, 2020, and as of mid-2026 Congress has not reauthorized it. Bills to renew GSP have been introduced but not enacted. While the program is expired, imports that would otherwise be GSP-eligible pay normal MFN duties instead of entering duty-free.
Two practical notes follow from the lapse:
- Congress has renewed GSP retroactively before. In past lapses, lawmakers eventually reauthorized the program and refunded duties paid in the interim. There is no guarantee that happens again, but it is why importers watch GSP renewal closely.
- Customs still wants the flag. CBP has instructed importers to continue marking otherwise-GSP-eligible entries with the special program indicator so that, if Congress renews the program retroactively, refunds can be automated. Flagging the entry does not lower the duty today; it preserves a possible refund later.
GSP vs. MFN at a Glance
| MFN / Normal Trade Relations | GSP | |
|---|---|---|
| What it is | Baseline non-discrimination rule | Special preference program |
| Reciprocity | Mutual obligation among WTO members | Unilateral; no return expected |
| Who benefits | Nearly all trading partners | Eligible developing countries only |
| Product coverage | Broad | Selected products; sensitive goods excluded |
| Typical U.S. duty | Column 1 (standard) rates | Reduced or zero — when the program is active |
| Current U.S. status (mid-2026) | In force | Lapsed since Dec. 31, 2020 |
The relationship is layered: MFN sets the floor that applies to almost everyone, and GSP, when authorized, carves out an even lower rate for qualifying goods from qualifying countries. MFN should not be confused with the separate WTO principle of national treatment, which governs how imported goods are taxed and regulated after they clear customs — see our explainer on MFN vs. national treatment.
Why This Matters for Your Landed Cost
Whether a product enters at the MFN rate or a GSP rate can swing the duty bill substantially — and because GSP is currently expired, importers who built pricing around duty-free GSP treatment may be paying more than they expect. Getting the tariff classification and country of origin right is the first step; confirming current program status is the second. Both turn on details in the Harmonized Tariff Schedule, which is where the actual rates live.
Frequently Asked Questions
Is the U.S. GSP program active right now?
No. U.S. GSP authorization expired on December 31, 2020, and as of mid-2026 it has not been reauthorized. While it is lapsed, otherwise-eligible imports pay normal MFN duties. Importers should confirm current status, because Congress can renew the program — sometimes retroactively.
What is the difference between GSP and MFN?
MFN (called Normal Trade Relations in U.S. law) is the baseline, non-discriminatory tariff rate extended to nearly all trading partners. GSP is a separate, unilateral program that grants even lower or zero duties on selected products from eligible developing countries, with no expectation of reciprocity.
Does “most favored nation” mean a country gets special treatment?
No — it means the opposite. MFN requires equal, non-discriminatory treatment: any tariff advantage given to one WTO member must be given to all. It guarantees a country is treated no worse than any other.
Should I still flag GSP-eligible imports while the program is expired?
CBP has advised importers to keep marking otherwise-eligible entries with the GSP indicator so refunds can be processed automatically if Congress reauthorizes the program retroactively. The flag does not reduce duty owed today.
Tariff treatment turns on classification, origin, and whether a preference program is actually in effect — and GSP’s lapse makes that last point easy to miss. Reidel Law Firm helps importers confirm duty exposure and document it correctly on flat-fee terms. Get an import/export compliance memo.
