HTS heading 8504 · Chapter 85
HTS 8504: Electrical transformers, static converters and inductors
HTS heading 8504 covers electrical transformers, static converters (for example, rectifiers) and inductors; parts thereof. It has 22 tariff lines with a duty rate; the general (MFN) rates are Free (15 lines), 1.6% (4 lines), 3% (1 line) and others.
Imports may also owe Chapter 99 tariffs (Section 232, 301 or 201) depending on origin and date, plus the Merchandise Processing Fee and, by sea, the Harbor Maintenance Fee.
Rates from the 2026 HTS Revision 22, effective October 30, 2026. Source: U.S. International Trade Commission.
Tariff lines and duty rates
| HTS code | Description | General | Special | Column 2 | Estimate |
|---|---|---|---|---|---|
| 8504.10.00.00 | Ballasts for discharge lamps or tubes[No.] | 3% | Free (A*,AU,B,BH,C,CL,CO,D,E,IL,JO,KR,MA,OM,P,PA,PE,S,SG) | 35% | Estimate → |
| Liquid dielectric transformers: | |||||
| 8504.21.00 | Having a power handling capacity not exceeding 650 kVA | Free | 35% | ||
| 8504.21.00.20 | Having a power handling capacity not exceeding 50 kVA[No., kg] | Estimate → | |||
| 8504.21.00.40 | Having a power handling capacity exceeding 50 kVA but not exceeding 100 kVA[No., kg] | Estimate → | |||
| 8504.21.00.60 | Having a power handling capacity exceeding 100 kVA but not exceeding 500 kVA[No., kg] | Estimate → | |||
| 8504.21.00.80 | Having a power handling capacity exceeding 500 kVA but not exceeding 650 kVA[No., kg] | Estimate → | |||
| 8504.22.00 | Having a power handling capacity exceeding 650 kVA but not exceeding 10,000 kVA | Free | 35% | ||
| 8504.22.00.40 | Having a power handling capacity exceeding 650 kVA but not exceeding 2,500 kVA[No., kg] | Estimate → | |||
| 8504.22.00.80 | Having a power handling capacity exceeding 2,500 kVA but not exceeding 10,000 kVA[No., kg] | Estimate → | |||
| 8504.23.00 | Having a power handling capacity exceeding 10,000 kVA | 1.6% | Free (A,AU,BH,CL,CO,D,E,IL,JO,KR,MA,OM,P,PA,PE,S,SG) | 35% | |
| 8504.23.00.41 | Having a power handling capacity exceeding 10,000 kVA but not exceeding 59,999 kVA[No., kg] | Estimate → | |||
| 8504.23.00.45 | Having a power handling capacity exceeding 59,999 kVA but not exceeding 100,000 kVA[No., kg] | Estimate → | |||
| 8504.23.00.80 | Having a power handling capacity exceeding 100,000 kVA[No., kg] | Estimate → | |||
| Other transformers: | |||||
| 8504.31 | Having a power handling capacity not exceeding 1 kVA: | ||||
| 8504.31.20.00 | Unrated[No.] | Free | 35% | Estimate → | |
| Other: | |||||
| 8504.31.40 | Having a power handling capacity less than 1 kVA | 6.6% | Free (A,AU,B,BH,C,CL,CO,D,E,IL,JO,KR,MA,OM,P,PA,PE,S,SG) | 35% | |
| 8504.31.40.35 | Having a power handling capacity less than 40 VA[No.] | Estimate → | |||
| 8504.31.40.65 | Having a power handling capacity 40 VA or greater[No.] | Estimate → | |||
| 8504.31.60.00 | Having a power handling capacity of 1 kVA[No.] | 1.6% | Free (A,AU,B,BH,C,CL,CO,D,E,IL,JO,KR,MA,OM,P,PA,PE,S,SG) | 35% | Estimate → |
| 8504.32.00.00 | Having a power handling capacity exceeding 1 kVA but not exceeding 16 kVA[No., kg] | 2.4% | Free (A,AU,B,BH,C,CL,CO,D,E,IL,JO,KR,MA,OM,P,PA,PE,S,SG) | 35% | Estimate → |
| 8504.33.00 | Having a power handling capacity exceeding 16 kVA but not exceeding 500 kVA | 1.6% | Free (A,AU,B,BH,C,CL,CO,D,E,IL,JO,JP,KR,MA,OM,P,PA,PE,S,SG) | 35% | |
| 8504.33.00.20 | Having a power handling capacity exceeding 16 kVA but not exceeding 50 kVA[No., kg] | Estimate → | |||
| 8504.33.00.40 | Having a power handling capacity exceeding 50 kVA but not exceeding 500 kVA[No., kg] | Estimate → | |||
| 8504.34.00.00 | Having a power handling capacity exceeding 500 kVA[No., kg] | 1.6% | Free (A,AU,B,BH,CL,CO,D,E,IL,JO,JP,KR,MA,OM,P,PA,PE,S,SG) | 35% | Estimate → |
| 8504.40 | Static converters: | ||||
| 8504.40.40.00 | Speed drive controllers for electric motors[No.] | Free | 35% | Estimate → | |
| Power supplies for automatic data processing machines or units thereof of heading 8471; power supplies for goods of subheading 8443.31 or 8443.32; power supplies for monitors of subheading 8528.42 or 8528.52 or projectors of subheading 8528.62: | |||||
| 8504.40.60 | Suitable for physical incorporation into automatic data processing machines or units thereof of heading 8471 | Free | 35% | ||
| 8504.40.60.01 | With a power output not exceeding 50 W[No.] | Estimate → | |||
| 8504.40.60.07 | With a power output exceeding 50 W but not exceeding 150 W[No.] | Estimate → | |||
| 8504.40.60.12 | With a power output exceeding 150 W but not exceeding 500 W[No.] | Estimate → | |||
| 8504.40.60.18 | Other[No.] | Estimate → | |||
| 8504.40.70 | Other | Free | 35% | ||
| 8504.40.70.01 | With a power output not exceeding 50 W[No.] | Estimate → | |||
| 8504.40.70.07 | With a power output exceeding 50 W but not exceeding 150 W[No.] | Estimate → | |||
| 8504.40.70.12 | With a power output exceeding 150 W but not exceeding 500 W[No.] | Estimate → | |||
| 8504.40.70.18 | Other[No.] | Estimate → | |||
| 8504.40.85.00 | For telecommunication apparatus[No.] | Free | 35% | Estimate → | |
| 8504.40.95 | Other | Free | 35% | ||
| Rectifiers and rectifying apparatus: | |||||
| Power supplies: | |||||
| 8504.40.95.10 | With a power output not exceeding 50 W[No.] | Estimate → | |||
| 8504.40.95.20 | With a power output exceeding 50 W but not exceeding 150 W[No.] | Estimate → | |||
| 8504.40.95.30 | With a power output exceeding 150 W but not exceeding 500 W[No.] | Estimate → | |||
| 8504.40.95.40 | Other[No.] | Estimate → | |||
| 8504.40.95.50 | Other[No.] | Estimate → | |||
| Inverters: | |||||
| 8504.40.95.71 | Of a capacity not exceeding 200 W[No.] | Estimate → | |||
| 8504.40.95.73 | Of a capacity exceeding 200 W but not exceeding 650 W[No.] | Estimate → | |||
| 8504.40.95.75 | Of a capacity exceeding 650 W but not exceeding 20,000 W[No.] | Estimate → | |||
| 8504.40.95.77 | Of a capacity exceeding 20,000 W but not exceeding 125,000 W[No.] | Estimate → | |||
| 8504.40.95.78 | Of a capacity exceeding 125,000 W but not exceeding 1,000,000 W[No.] | Estimate → | |||
| 8504.40.95.79 | Other[No.] | Estimate → | |||
| 8504.40.95.80 | Other[No.] | Estimate → | |||
| 8504.50 | Other inductors: | ||||
| 8504.50.40.00 | For power supplies for automatic data processing machines or units thereof of heading 8471; power supplies for goods of subheading 8443.31 or 8443.32; power supplies for monitors of subheading 8528.42 or 8528.52 or projectors of subheading 8528.62; for telecommunication apparatus[No.] | Free | 35% | Estimate → | |
| 8504.50.80.00 | Other[No.] | Free | 35% | Estimate → | |
| 8504.90 | Parts: | ||||
| Of power supplies for automatic data processing machines or units thereof of heading 8471; of power supplies for goods of subheading 8443.31 or 8443.32; of power supplies for monitors of subheading 8528.42 or 8528.52 or projectors of subheading 8528.62: | |||||
| 8504.90.20.00 | Printed circuit assemblies[No.] | Free | 35% | Estimate → | |
| 8504.90.41.00 | Other[No.] | Free | 35% | Estimate → | |
| Other: | |||||
| Printed circuit assemblies: | |||||
| 8504.90.65.00 | Of the goods of subheading 8504.40 or 8504.50 for telecommunication apparatus[No.] | Free | 35% | Estimate → | |
| 8504.90.75.00 | Other[No.] | Free | 35% | Estimate → | |
| 8504.90.96 | Other | Free | 35% | ||
| Ferrites: | |||||
| 8504.90.96.10 | For transformers[No.] | Estimate → | |||
| 8504.90.96.30 | Other[No.] | Estimate → | |||
| Other parts: | |||||
| Of transformers: | |||||
| 8504.90.96.34 | Laminations for incorporation into stacked cores[No., kg] | Estimate → | |||
| 8504.90.96.38 | Stacked cores for incorporation into transformers[No., kg] | Estimate → | |||
| 8504.90.96.42 | Wound cores for incorporation into transformers[No., kg] | Estimate → | |||
| 8504.90.96.46 | Other[No., kg] | Estimate → | |||
| 8504.90.96.50 | Of static converters[No.] | Estimate → | |||
| 8504.90.96.90 | Other[No.] | Estimate → |
63 lines shown. Statistical suffixes (the last two digits) inherit the rate of the 8-digit subheading above them.
Example: base duty and fees on $10000
For HTS 8504.10.00.00 at the general rate of 3%, shipped by ocean, before any Chapter 99 tariffs:
| Base duty (3%) | $300.00 |
| Merchandise Processing Fee (0.3464%, min $34.58) | $34.64 |
| Harbor Maintenance Fee (0.125%) | $12.50 |
| Duty and fees | $347.14 |
Origin-specific tariffs can multiply this. Run this example from China or from Mexico to see every line.
Special program codes in this heading
- A, A*, A+
- Generalized System of Preferences (GSP)
- AU
- U.S.–Australia FTA
- B
- Automotive Products Trade Act
- BH
- U.S.–Bahrain FTA
- C
- Agreement on Trade in Civil Aircraft
- CL
- U.S.–Chile FTA
- CO
- U.S.–Colombia Trade Promotion Agreement
- D
- African Growth and Opportunity Act (AGOA)
- E, E*
- Caribbean Basin Economic Recovery Act
- IL
- U.S.–Israel FTA
- JO
- U.S.–Jordan FTA
- JP
- U.S.–Japan Trade Agreement
- KR
- U.S.–Korea FTA (KORUS)
- MA
- U.S.–Morocco FTA
- OM
- U.S.–Oman FTA
- P, P+
- CAFTA-DR
- PA
- U.S.–Panama Trade Promotion Agreement
- PE
- U.S.–Peru Trade Promotion Agreement
- S, S+
- USMCA (United States–Mexico–Canada Agreement)
- SG
- U.S.–Singapore FTA
A special rate applies only when the goods qualify under that program's rules of origin and the claim is made at entry.
Duty by country of origin
Frequently asked questions
What is the duty rate for HTS 8504?
Heading 8504 has 22 rate lines. The general (MFN) duty rates are Free (15 lines), 1.6% (4 lines), 3% (1 line), 6.6% (1 line). Products of free trade agreement partners may enter at the special rate, and Column 2 rates apply to countries without normal trade relations. Chapter 99 tariffs can be added on top: calculate the full amount.
Do Section 301, 232 or 201 tariffs apply to HTS 8504?
It depends on the 8- or 10-digit subheading, the country of origin, the entry date and, for Section 232, the metal content. These additional duties are listed in Chapter 99 of the HTS. The free duty calculator checks each program for a given code, origin and date and shows which apply and why.
What fees are added to an import under HTS 8504?
Formal entries pay the Merchandise Processing Fee of 0.3464% of value (minimum $34.58, maximum $670.86 in FY2027). Ocean shipments also pay the Harbor Maintenance Fee of 0.125% of value. See the import duty calculator for how they combine.