🛡️

Importer Security Filing (ISF / 10+2)

ISF requirements, filing timelines, data elements, and penalties for non-compliance.

19 CFR 149

Structured from CBP-designated exam references; confirm the editions approved for your exam sitting.

The textbook layer behind Study Map

From learning route to full explanation

This guide identifies the ISF Importer, vessel shipment type, ten importer elements split into eight early and two later elements, the separate two carrier elements, flexible elements, update duty, withdrawal, and authorized agents. It also keeps the FROB, IE, and T&E five-element path on its own clock.

Study Map tells you what to learn and in what order; this page explains the rules, decision method, and boundaries. Reading completion is not proof of mastery.

1. File and update Importer Security Filing on the correct clock

Textbook chapter 1

File and update Importer Security Filing on the correct clock

Back to Study Map task →

Answer first

The ordinary vessel-arriving ISF is not ten importer elements all due on one pre-lading clock: eight are generally due 24 hours before lading; stuffing location and consolidator use the later rule and the short-voyage exception. The separate ‘+2’ means carrier elements, while FROB, IE, and T&E cargo use a five-element path. Answer first: Part 149 applies to cargo arriving by vessel and assigns duties by shipment type. For ordinary U.S.-bound cargo, the importer supplies ten elements: eight are generally due no later than 24 hours before lading, while container-stuffing location and consolidator are due as early as possible and generally no later than 24 hours before arrival; when the voyage to the closest U.S. port is shorter than 24 hours, the later pair is due upon lading. The separate “+2” refers to carrier data, not the importer's later pair. FROB, IE, and T&E cargo use the five-element rule. Under §149.2(d), the submitting party must update changed or more accurate information that becomes available after filing and before the goods enter a U.S. port; the flexible elements in §149.2(f) have their own final-update clock. An authorized agent may transmit, but the regulation still assigns responsibility to the ISF Importer. October 2026 answers use the 2025 Annual CFR; current CBP FAQs are operational guidance, not a substitute exam edition. CBLE Ace currently has no dedicated verified PGA question pool for this topic; route practice to the general practice page and keep verification status pool-insufficient.

Rule breakdown

Controlling rule for File and update Importer Security Filing on the correct clock

19 CFR 149.1–149.6 ↗

The result must be derived from the cited legal elements rather than from a label, commercial expectation, or memorized shortcut. Answer first: Part 149 applies to cargo arriving by vessel and assigns duties by shipment type. For ordinary U.S.-bound cargo, the importer supplies ten elements: eight are generally due no later than 24 hours before lading, while container-stuffing location and consolidator are due as early as possible and generally no later than 24 hours before arrival; when the voyage to the closest U.S. port is shorter than 24 hours, the later pair is due upon lading. The separate “+2” refers to carrier data, not the importer's later pair. FROB, IE, and T&E cargo use the five-element rule. Under §149.2(d), the submitting party must update changed or more accurate information that becomes available after filing and before the goods enter a U.S. port; the flexible elements in §149.2(f) have their own final-update clock. An authorized agent may transmit, but the regulation still assigns responsibility to the ISF Importer. October 2026 answers use the 2025 Annual CFR; current CBP FAQs are operational guidance, not a substitute exam edition. CBLE Ace currently has no dedicated verified PGA question pool for this topic; route practice to the general practice page and keep verification status pool-insufficient. Apply every stated condition to the documented facts and stop if an essential condition cannot be proved.

Evidence route for File and update Importer Security Filing on the correct clock

19 CFR 149.1–149.6; 6 U.S.C. 943; CBP, Import Security Filing—When to Submit; CBP October 28, 2026 CBLE Reference Materials Notice ↗

Use the official source in the order required by the issue and record both the rule and the fact that satisfies it. The assigned lookup is: Create a timing matrix for ordinary U.S.-bound cargo, FROB/IE/T&E, container-stuffing and consolidator data, updates, and withdrawal. Follow this source route: Read §149.1 for the responsible party, §149.2 for clocks and updates, §149.3 for elements, and §149.5 for agents.. A technically accepted filing or a completed reading is not itself proof that the legal outcome is correct.

Decision path

  1. 1

    Set the gate for File and update Importer Security Filing on the correct clock

    Identify the ISF Importer, shipment type, required data set, timing group, update duty, and authorized filing route. Identify the legally significant party, merchandise, event, date, value, status, and document before selecting a rule or performing a calculation.

  2. 2

    Verify 19 CFR 149.1–149.6

    Open 19 CFR 149.1–149.6, complete the chapter lookup task, and preserve the exact subsection, table, form, or agency guide used. Follow Read §149.1 for the responsible party, §149.2 for clocks and updates, §149.3 for elements, and §149.5 for agents. rather than jumping directly to a remembered result.

  3. 3

    Test the boundary of File and update Importer Security Filing on the correct clock

    Apply each controlling element to the documented facts, calculate only after eligibility is established, and compare the result with the worked example conclusion: Do not delay the eight pre-lading elements; use the separate later deadline for stuffing location and consolidator, then update as required. Record any unresolved fact instead of converting uncertainty into a pass or mastery claim.

Worked example

Scenario: For ordinary U.S.-bound containerized cargo, all eight early importer elements are known before lading, but the final stuffing location and consolidator are not yet known.

  1. 1.Classify the shipment as ordinary U.S.-bound cargo rather than FROB, IE, or T&E.
  2. 2.Transmit the eight early elements no later than 24 hours before lading.
  3. 3.Submit stuffing location and consolidator as early as possible and generally no later than 24 hours before arrival; if the voyage to the closest U.S. port is under 24 hours, submit them upon lading.
  4. 4.If other filed information changes or becomes more accurate before the goods enter the U.S. port, update it under §149.2(d); separately apply §149.2(f) to any flexible elements.
  5. 5.Boundary check: change one decisive fact identified by “Create a timing matrix for ordinary U.S.-bound cargo, FROB/IE/T&E, container-stuffing and consolidator data, updates, and withdrawal.” and explain whether the result changes under 19 CFR 149.1–149.6; 6 U.S.C. 943; CBP, Import Security Filing—When to Submit; CBP October 28, 2026 CBLE Reference Materials Notice.

Conclusion: Do not delay the eight pre-lading elements; use the separate later deadline for stuffing location and consolidator, then update as required.

Common traps and corrections

× Applying ISF to every transportation mode instead of vessel-arriving cargo.

✓ The shortcut “Applying ISF to every transportation mode instead of vessel-arriving cargo.” skips a controlling distinction in File and update Importer Security Filing on the correct clock. Return to 19 CFR 149.1–149.6, follow Read §149.1 for the responsible party, §149.2 for clocks and updates, §149.3 for elements, and §149.5 for agents., and test the decisive fact against this boundary: The ordinary vessel-arriving ISF is not ten importer elements all due on one pre-lading clock: eight are generally due 24 hours before lading; stuffing location and consolidator use the later rule and the short-voyage exception. The separate ‘+2’ means carrier elements, while FROB, IE, and T&E cargo use a five-element path. Do not infer eligibility, release, or mastery from the shortcut.

× Applying the ordinary ten-element rule to FROB, IE, or T&E without checking §149.3.

✓ The shortcut “Applying the ordinary ten-element rule to FROB, IE, or T&E without checking §149.3.” skips a controlling distinction in File and update Importer Security Filing on the correct clock. Return to 19 CFR 149.1–149.6, follow Read §149.1 for the responsible party, §149.2 for clocks and updates, §149.3 for elements, and §149.5 for agents., and test the decisive fact against this boundary: The ordinary vessel-arriving ISF is not ten importer elements all due on one pre-lading clock: eight are generally due 24 hours before lading; stuffing location and consolidator use the later rule and the short-voyage exception. The separate ‘+2’ means carrier elements, while FROB, IE, and T&E cargo use a five-element path. Do not infer eligibility, release, or mastery from the shortcut.

× Waiting until arrival to file all ordinary U.S.-bound elements.

✓ The shortcut “Waiting until arrival to file all ordinary U.S.-bound elements.” skips a controlling distinction in File and update Importer Security Filing on the correct clock. Return to 19 CFR 149.1–149.6, follow Read §149.1 for the responsible party, §149.2 for clocks and updates, §149.3 for elements, and §149.5 for agents., and test the decisive fact against this boundary: The ordinary vessel-arriving ISF is not ten importer elements all due on one pre-lading clock: eight are generally due 24 hours before lading; stuffing location and consolidator use the later rule and the short-voyage exception. The separate ‘+2’ means carrier elements, while FROB, IE, and T&E cargo use a five-element path. Do not infer eligibility, release, or mastery from the shortcut.

× Treating use of an agent as a transfer of all ISF Importer responsibility.

✓ The shortcut “Treating use of an agent as a transfer of all ISF Importer responsibility.” skips a controlling distinction in File and update Importer Security Filing on the correct clock. Return to 19 CFR 149.1–149.6, follow Read §149.1 for the responsible party, §149.2 for clocks and updates, §149.3 for elements, and §149.5 for agents., and test the decisive fact against this boundary: The ordinary vessel-arriving ISF is not ten importer elements all due on one pre-lading clock: eight are generally due 24 hours before lading; stuffing location and consolidator use the later rule and the short-voyage exception. The separate ‘+2’ means carrier elements, while FROB, IE, and T&E cargo use a five-element path. Do not infer eligibility, release, or mastery from the shortcut.

× Recording mastery despite the absence of a dedicated verified ISF pool.

✓ The shortcut “Recording mastery despite the absence of a dedicated verified ISF pool.” skips a controlling distinction in File and update Importer Security Filing on the correct clock. Return to 19 CFR 149.1–149.6, follow Read §149.1 for the responsible party, §149.2 for clocks and updates, §149.3 for elements, and §149.5 for agents., and test the decisive fact against this boundary: The ordinary vessel-arriving ISF is not ten importer elements all due on one pre-lading clock: eight are generally due 24 hours before lading; stuffing location and consolidator use the later rule and the short-voyage exception. The separate ‘+2’ means carrier elements, while FROB, IE, and T&E cargo use a five-element path. Do not infer eligibility, release, or mastery from the shortcut.

Frequently asked questions

Which fact controls first for File and update Importer Security Filing on the correct clock?

Begin with the chapter objective and the legally controlling facts, not with the desired commercial result. Identify the ISF Importer, shipment type, required data set, timing group, update duty, and authorized filing route. Then use 19 CFR 149.1–149.6 and the remaining cited sources to test every required element before calculating or filing.

Where should I verify File and update Importer Security Filing on the correct clock for the exam and live work?

For the October 28, 2026 CBLE, use the designated exam source card and pinpoint 19 CFR 149.1–149.6. For live work, separately verify the dated current source cards for this chapter as of the transaction date; a current statute, eCFR, HTSUS, recordation, or agency guide does not silently amend the exam edition.

Official sources and editions

Key Terms

ISF / 10+2|进口商安全申报 / 10+2
24-Hour Rule|24 小时规则
Liquidated Damages|违约金
Do Not Load|禁止装载

Related Articles

📋

Types of Customs Entry

Overview of formal, informal, and special entry types used in U.S. imports under 19 CFR Part 141-143.

🔐

Customs Bonds

Single entry bonds, continuous bonds, bond sufficiency, and surety requirements.

⚖️

Penalties Under 19 USC 1592

Penalty framework for negligence, gross negligence, and fraud in customs transactions.

Back to Knowledge BaseUpdated 2026-08-19