HS 850440 — Electrical transformers, static converters (for example, rectifiers) and inductors; parts thereof
Trade-statistics name: Static Converters, NESOI
HS 850440 (HTS line 8504.40.40.00) imported into the United States from China at a declared value of $1,000 carries an estimated duty of $375, which is 37.5% of the declared value: a Column 1 general rate of 0%, plus additional duty of Section 301 (China) 25% under 9903.88.01 (U.S. note 20(b)) + Chapter 99 note family 12.5% under 9903.05.31 (U.S. note 52). That composition is what the USITC schedule dated 2026-11-06 and the Chapter 99 measures in force on that schedule produce; it excludes merchandise processing and harbor maintenance fees.
Rates and descriptions: USITC Harmonized
Tariff Schedule export dated 2026-11-06.
Chapter 99 layers are the same composition the tariff API returns
(schedule stamp 2026-11-11). Re-check this
number by calling
GET /api/v1/tariff?hs=8504.40.40.00&origin=CN&value=1000.
850440 is the six-digit subheading of heading 8504 (“Electrical transformers, static converters (for example, rectifiers) and inductors; parts thereof”) in chapter 85. 25 HTS statistical lines sit under it in the USITC export dated 2026-11-06; US general imports of the code totalled $1.9B in September 2026.
Estimate duty for 8504.40.40.00
Prefilled with 8504.40.40.00, the first of this code's 25 statistical lines and origin CN. The other lines under the same six digits can carry a different rate — pick the exact line from the entry-cost table below to price yours.
HS 850440 — US general imports
$1.9BAll countries, September 2026.
Source: U.S. Census Bureau, foreign-trade statistics — 2026-09, monthly general imports (GEN_VAL_MO), all countries, this six-digit code's own line, not a roll-up. Census rows collected 2026-11-08T00:03:28Z.
What a China-origin shipment of HS 850440 pays at entry
The Column 1 rate is only the first layer. For goods originating in China, 25 of this code's 25 HTS lines also carry additional duty under Chapter 99 note family, Section 301 (China), so every priceable line lands on 37.5% of the declared value. The table stacks the two layers line by line; the last column is the duty on a $1,000 declared value, and each HTS line links to the calculator with that line and this origin already filled in.
| HTS line | Column 1 (MFN) | Additional duty (China) | Total ad valorem | Duty on $1,000 |
|---|---|---|---|---|
| 8504.40.40.00 | 0% | +37.5%Section 301 (China) 25% under 9903.88.01 (U.S. note 20(b)) + Chapter 99 note family 12.5% under 9903.05.31 (U.S. note 52) | 37.5% | $375 |
| 8504.40.60 | 0% | +37.5%Section 301 (China) 25% under 9903.88.03 (U.S. note 20(f)) + Chapter 99 note family 12.5% under 9903.05.31 (U.S. note 52) | 37.5% | $375 |
| 8504.40.60.01 | 0% | +37.5%Section 301 (China) 25% under 9903.88.03 (U.S. note 20(f)) + Chapter 99 note family 12.5% under 9903.05.31 (U.S. note 52) | 37.5% | $375 |
| 8504.40.60.07 | 0% | +37.5%Section 301 (China) 25% under 9903.88.03 (U.S. note 20(f)) + Chapter 99 note family 12.5% under 9903.05.31 (U.S. note 52) | 37.5% | $375 |
| 8504.40.60.12 | 0% | +37.5%Section 301 (China) 25% under 9903.88.03 (U.S. note 20(f)) + Chapter 99 note family 12.5% under 9903.05.31 (U.S. note 52) | 37.5% | $375 |
| 8504.40.60.18 | 0% | +37.5%Section 301 (China) 25% under 9903.88.03 (U.S. note 20(f)) + Chapter 99 note family 12.5% under 9903.05.31 (U.S. note 52) | 37.5% | $375 |
| 8504.40.70 | 0% | +37.5%Section 301 (China) 25% under 9903.88.03 (U.S. note 20(f)) + Chapter 99 note family 12.5% under 9903.05.31 (U.S. note 52) | 37.5% | $375 |
| 8504.40.70.01 | 0% | +37.5%Section 301 (China) 25% under 9903.88.03 (U.S. note 20(f)) + Chapter 99 note family 12.5% under 9903.05.31 (U.S. note 52) | 37.5% | $375 |
| 8504.40.70.07 | 0% | +37.5%Section 301 (China) 25% under 9903.88.03 (U.S. note 20(f)) + Chapter 99 note family 12.5% under 9903.05.31 (U.S. note 52) | 37.5% | $375 |
| 8504.40.70.12 | 0% | +37.5%Section 301 (China) 25% under 9903.88.03 (U.S. note 20(f)) + Chapter 99 note family 12.5% under 9903.05.31 (U.S. note 52) | 37.5% | $375 |
| 8504.40.70.18 | 0% | +37.5%Section 301 (China) 25% under 9903.88.03 (U.S. note 20(f)) + Chapter 99 note family 12.5% under 9903.05.31 (U.S. note 52) | 37.5% | $375 |
| 8504.40.85.00 | 0% | +37.5%Section 301 (China) 25% under 9903.88.03 (U.S. note 20(f)) + Chapter 99 note family 12.5% under 9903.05.31 (U.S. note 52) | 37.5% | $375 |
| 8504.40.95 | 0% | +37.5%Section 301 (China) 25% under 9903.88.03 (U.S. note 20(f)) + Chapter 99 note family 12.5% under 9903.05.31 (U.S. note 52) | 37.5% | $375 |
| 8504.40.95.10 | 0% | +37.5%Section 301 (China) 25% under 9903.88.03 (U.S. note 20(f)) + Chapter 99 note family 12.5% under 9903.05.31 (U.S. note 52) | 37.5% | $375 |
| 8504.40.95.20 | 0% | +37.5%Section 301 (China) 25% under 9903.88.03 (U.S. note 20(f)) + Chapter 99 note family 12.5% under 9903.05.31 (U.S. note 52) | 37.5% | $375 |
| 8504.40.95.30 | 0% | +37.5%Section 301 (China) 25% under 9903.88.03 (U.S. note 20(f)) + Chapter 99 note family 12.5% under 9903.05.31 (U.S. note 52) | 37.5% | $375 |
| 8504.40.95.40 | 0% | +37.5%Section 301 (China) 25% under 9903.88.03 (U.S. note 20(f)) + Chapter 99 note family 12.5% under 9903.05.31 (U.S. note 52) | 37.5% | $375 |
| 8504.40.95.50 | 0% | +37.5%Section 301 (China) 25% under 9903.88.03 (U.S. note 20(f)) + Chapter 99 note family 12.5% under 9903.05.31 (U.S. note 52) | 37.5% | $375 |
| 8504.40.95.71 | 0% | +37.5%Section 301 (China) 25% under 9903.88.03 (U.S. note 20(f)) + Chapter 99 note family 12.5% under 9903.05.31 (U.S. note 52) | 37.5% | $375 |
| 8504.40.95.73 | 0% | +37.5%Section 301 (China) 25% under 9903.88.03 (U.S. note 20(f)) + Chapter 99 note family 12.5% under 9903.05.31 (U.S. note 52) | 37.5% | $375 |
| 8504.40.95.75 | 0% | +37.5%Section 301 (China) 25% under 9903.88.03 (U.S. note 20(f)) + Chapter 99 note family 12.5% under 9903.05.31 (U.S. note 52) | 37.5% | $375 |
| 8504.40.95.77 | 0% | +37.5%Section 301 (China) 25% under 9903.88.03 (U.S. note 20(f)) + Chapter 99 note family 12.5% under 9903.05.31 (U.S. note 52) | 37.5% | $375 |
| 8504.40.95.78 | 0% | +37.5%Section 301 (China) 25% under 9903.88.03 (U.S. note 20(f)) + Chapter 99 note family 12.5% under 9903.05.31 (U.S. note 52) | 37.5% | $375 |
| 8504.40.95.79 | 0% | +37.5%Section 301 (China) 25% under 9903.88.03 (U.S. note 20(f)) + Chapter 99 note family 12.5% under 9903.05.31 (U.S. note 52) | 37.5% | $375 |
| 8504.40.95.80 | 0% | +37.5%Section 301 (China) 25% under 9903.88.03 (U.S. note 20(f)) + Chapter 99 note family 12.5% under 9903.05.31 (U.S. note 52) | 37.5% | $375 |
Additional duty for origin CN (China) only, priced on a $1,000 declared value from the Chapter 99 composition the tariff API serves (schedule stamp 2026-11-11). A different origin can carry a different set of Chapter 99 measures on the same line — the free calculator prices one line and one origin at a time, and ExportSonar Pro monitors a set of your own codes so a rate change reaches you with its old value, its new value and the USITC source. Rates are informational and not a binding customs ruling.
ExportSonar Pro watches up to 100 of your own HS codes daily (a free account watches 3) and sends each change with its old rate, new rate and USITC source — $49/month. USDT (TRC20) accepted today; card checkout is on the way.
Leading suppliers of HS 850440 — September 2026
Where the goods under this code came from, by country of origin, from the Census monthly series (all countries, general imports). Each share is of the subheading 850440’s own total, printed in the table footer:
| Origin country | US imports | Share of total |
|---|---|---|
| THAILAND | $296.5M | 15.67% |
| CHINA | $256.0M | 13.53% |
| VIETNAM | $253.6M | 13.40% |
| MEXICO | $187.5M | 9.91% |
| TAIWAN | $169.1M | 8.93% |
| Total, all 77 countries | $1.9B | 100.00% |
Exact total, all 77 origin countries: $1,892,901,484 — the figure the shares above divide by.
The five countries above are the largest. The remaining 72 countries account for $730.1M (38.57% of the total) and are not printed here; the count and that amount are exact, and the complete country list is part of the Pro trade-flow API.
Percentages are rounded to two decimals, so they may not add to exactly 100%; the dollar amounts sum to the total in the table footer without rounding.
Source: U.S. Census Bureau, foreign-trade statistics — 2026-09, monthly general imports (GEN_VAL_MO). Shares are computed from individual-country rows only: Census publishes continent, APEC/ASEAN/OECD-style bloc and "total for all countries" rows in the same response, and adding those would count the same dollars two to five times over. Census rows collected 2026-11-08T00:03:28Z.
HTS lines under HS 850440
Every statistical line the US schedule places under this six-digit subheading, copied from the USITC export without edits: the Column 1 general (MFN) rate, the special-program symbols and the statutory Column 2 rate.
| HTS line | Description | Unit | General (Col. 1) | Special | Column 2 |
|---|---|---|---|---|---|
| 8504.40.40.00 | Speed drive controllers for electric motors | No. | Free | — | 35% |
| 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. | Free | — | 35% |
| 8504.40.60.07 | With a power output exceeding 50 W but not exceeding 150 W | No. | Free | — | 35% |
| 8504.40.60.12 | With a power output exceeding 150 W but not exceeding 500 W | No. | Free | — | 35% |
| 8504.40.60.18 | Other | No. | Free | — | 35% |
| 8504.40.70 | Other | — | Free | — | 35% |
| 8504.40.70.01 | With a power output not exceeding 50 W | No. | Free | — | 35% |
| 8504.40.70.07 | With a power output exceeding 50 W but not exceeding 150 W | No. | Free | — | 35% |
| 8504.40.70.12 | With a power output exceeding 150 W but not exceeding 500 W | No. | Free | — | 35% |
| 8504.40.70.18 | Other | No. | Free | — | 35% |
| 8504.40.85.00 | For telecommunication apparatus | No. | Free | — | 35% |
| 8504.40.95 | Other | — | Free | — | 35% |
| 8504.40.95.10 | With a power output not exceeding 50 W | No. | Free | — | 35% |
| 8504.40.95.20 | With a power output exceeding 50 W but not exceeding 150 W | No. | Free | — | 35% |
| 8504.40.95.30 | With a power output exceeding 150 W but not exceeding 500 W | No. | Free | — | 35% |
| 8504.40.95.40 | Other | No. | Free | — | 35% |
| 8504.40.95.50 | Other | No. | Free | — | 35% |
| 8504.40.95.71 | Of a capacity not exceeding 200 W | No. | Free | — | 35% |
| 8504.40.95.73 | Of a capacity exceeding 200 W but not exceeding 650 W | No. | Free | — | 35% |
| 8504.40.95.75 | Of a capacity exceeding 650 W but not exceeding 20,000 W | No. | Free | — | 35% |
| 8504.40.95.77 | Of a capacity exceeding 20,000 W but not exceeding 125,000 W | No. | Free | — | 35% |
| 8504.40.95.78 | Of a capacity exceeding 125,000 W but not exceeding 1,000,000 W | No. | Free | — | 35% |
| 8504.40.95.79 | Other | No. | Free | — | 35% |
| 8504.40.95.80 | Other | No. | Free | — | 35% |
Related CBP rulings
Binding CBP CROSS rulings recorded against HS family 850440, newest first (browse the whole library in our CBP ruling index):
- H179956 — Internal Advice Request (No. 11/025); Classification of incomplete power paint spray gun kits from China (2013-07-31)
- J80440 — The tariff classification of a Battery Charger, Twin Socket, Fused Accessory Plug, Oscillating Fan and Automobile Cigarette Lighter from China (2003-02-09)
- 086518 — Reconsideration Of HQ 085027 (January 31, 1990); Thyristor Modules; Semiconductor Devices; Static Converters, Parts; High Voltage Direct Current (HVDC) Power Conversion Stations; Firing Circuitry; Voltage Divider Circuitry; Heatsinks (1990-11-09)
- 086223 — Bridge Rectifier Diodes (1990-04-11)
- 085027 — Classification of thyristor modules (1990-01-31)
Where this code sits in the schedule
Six digits is the last level the WCO Harmonized System defines internationally: chapter 85, heading 8504, subheading 850440. The US adds national digits below it — eight for the tariff line, ten for the statistical suffix — which is why two traders quoting “the HS code” can still disagree on the rate. Browse the ladder:
Frequently asked questions
What does an entry under HS 850440 cost for a China origin?
Column 1 is only the first layer. On 25 of this code's 25 HTS lines the additional Chapter 99 duty for a China origin is also charged (Chapter 99 note family, Section 301 (China)), so the entry lands at 37.5% of the declared value -- before merchandise processing and harbour maintenance fees. The layer table on this page lists the provision behind each line and the duty on a $1,000 value, and the calculator prices any other origin or value one line at a time.
Where does this 850440 page get its numbers?
Rates, units and descriptions come verbatim from the USITC Harmonized Tariff Schedule export dated 2026-11-06; the import value and supplier shares come from the U.S. Census Bureau monthly trade series for September 2026. Both are named in the source line at the foot of the page, and neither is estimated by us.
What is the duty rate for HS code 850440?
HS 850440 is a six-digit subheading inside heading 8504 of chapter 85. The US schedule prices it line by line: 25 statistical HTS lines fall under 850440 in the USITC export dated 2026-11-06, and every one of those lines is duty-free under Column 1.
How much does the US import under 850440?
US general imports under HS 850440 totalled $1.9B in September 2026, across 77 origin countries recorded by the Census Bureau. The largest supplier was THAILAND with 15.7% of the value. Six digits is the grain the trade statistics publish, which is why this page stops there and lists the ten-digit lines separately.
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Rates and descriptions: USITC Harmonized Tariff Schedule export dated 2026-11-06 (line set 850440.*). Import value and suppliers: U.S. Census Bureau monthly general imports, September 2026. Rates are informational and not a binding customs ruling.