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CBP Form 7501 — Entry Summary

Field-by-field guide to the Entry Summary form, the most critical document in customs entry.

19 CFR 141.6119 CFR 14219 CFR 24.23

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

ACE Entry Summary identifiers must be read field by field. This guide teaches the eleven-character entry number, numeric check digit, DDPP port code, entry type, and the examination-designated Version 2.4a without substituting later operational CATAIR material.

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. Read ACE Entry Summary header identifiers

Textbook chapter 1

Read ACE Entry Summary header identifiers

Back to Study Map task →

Answer first

Read ACE fields as related identifiers, not one long number. For the check digit, convert filer-code letters with A/J=1, B/K/S=2, C/L/T=3, D/M/U=4, E/N/V=5, F/O/W=6, G/P/X=7, H/Q/Y=8, and I/R/Z=9 before applying the designated formula. ABC00481236 is valid: ABC is the filer code, 0048123 the seven-digit sequence, and 6 the numeric check digit; DDPP port and entry type are separate. Answer first: the 11-character entry number contains a three-character filer code, a seven-digit filer-assigned sequence with leading zeros preserved, and one numeric check digit computed from the preceding ten characters. The four-character port uses DDPP format, while the two-digit entry type is a separate field whose first and second digits identify the general category and specific processing type. The October 2026 CBLE designates ACE Entry Summary Instructions Version 2.4a; a newer operational CATAIR may inform live filing but must not silently replace the exam source.

Rule breakdown

Controlling rule and limits

ACE Entry Summary Instructions, Version 2.4a; 19 CFR 142.11; CBP October 28, 2026 CBLE Reference Materials Notice ↗

Answer first: the 11-character entry number contains a three-character filer code, a seven-digit filer-assigned sequence with leading zeros preserved, and one numeric check digit computed from the preceding ten characters. The four-character port uses DDPP format, while the two-digit entry type is a separate field whose first and second digits identify the general category and specific processing type. The October 2026 CBLE designates ACE Entry Summary Instructions Version 2.4a; a newer operational CATAIR may inform live filing but must not silently replace the exam source. The learning objective is to decode the entry number, port code, and entry type before working line-level classification, value, and duty data.; exceptions and triggering facts must be identified before calculation or conclusion.

Authority navigation and proof

ACE Entry Summary Instructions, Version 2.4a; 19 CFR 142.11; CBP October 28, 2026 CBLE Reference Materials Notice ↗

Read ACE fields as related identifiers, not one long number. For the check digit, convert filer-code letters with A/J=1, B/K/S=2, C/L/T=3, D/M/U=4, E/N/V=5, F/O/W=6, G/P/X=7, H/Q/Y=8, and I/R/Z=9 before applying the designated formula. ABC00481236 is valid: ABC is the filer code, 0048123 the seven-digit sequence, and 6 the numeric check digit; DDPP port and entry type are separate. Navigate the controlling material through Entry Summary Header Level Information → Entry Number, District/Port of Entry, Entry Type, and Check Digit Computation Formula; Part 142 → Subpart B → entry-summary form and electronic filing framework; Preparing for the CBLE → Reference Materials → ACE Entry Summary Instructions Version 2.4a. Record the decisive text and fact rather than relying on memory or a search snippet.

Decision path

  1. 1

    Set the legal gate for Read ACE Entry Summary header identifiers

    Decode the entry number, port code, and entry type before working line-level classification, value, and duty data. Separate the controlling trigger from descriptive labels, then list the facts that could activate an exception or a different legal path.

  2. 2

    Prove the rule in ACE Entry Summary Instructions, Version 2.4a

    Find the length, source, and relationship of Entry Number, District/Port of Entry, Entry Type, and the check-digit formula. Use this route: Read the Header Level Information and Check Digit Computation Formula in ACE Entry Summary Instructions 2.4a.. Preserve the exact subsection, field instruction, note, or rate line that supports the answer.

  3. 3

    Test the boundary of Read ACE Entry Summary header identifiers

    Read ACE fields as related identifiers, not one long number. For the check digit, convert filer-code letters with A/J=1, B/K/S=2, C/L/T=3, D/M/U=4, E/N/V=5, F/O/W=6, G/P/X=7, H/Q/Y=8, and I/R/Z=9 before applying the designated formula. ABC00481236 is valid: ABC is the filer code, 0048123 the seven-digit sequence, and 6 the numeric check digit; DDPP port and entry type are separate. Apply that boundary to the stated facts, identify the fact that would reverse the result, and only then adopt the worked-example conclusion: ABC00481236 is structurally and computationally valid for this example; port 2704 and entry type 01 are separate header fields.

Worked example

Scenario: Parse entry number ABC00481236 with port 2704 and entry type 01, then verify the check digit.

  1. 1.Parse ABC as the filer code, 0048123 as the seven-digit assigned sequence, and 6 as the check digit.
  2. 2.Use the ACE 2.4a filer-code conversion table (A=1, B=2, C=3 for these letters) to convert ABC0048123 to numeric base 1230048123; the adjusted even-position sum is 20 and the odd-position sum is 14.
  3. 3.The base-value ones digit is 4, so 10 minus 4 produces check digit 6.
  4. 4.Read 2704 as the separate DDPP port and 01 as the separate two-digit entry type.
  5. 5.Boundary check: change one decisive fact identified by this research task—Find the length, source, and relationship of Entry Number, District/Port of Entry, Entry Type, and the check-digit formula.—and explain whether the conclusion would change under ACE Entry Summary Instructions, Version 2.4a; 19 CFR 142.11; CBP October 28, 2026 CBLE Reference Materials Notice.

Conclusion: ABC00481236 is structurally and computationally valid for this example; port 2704 and entry type 01 are separate header fields.

Common traps and corrections

× Using a letter such as X in the numeric check-digit position.

✓ This shortcut fails because “Using a letter such as X in the numeric check-digit position.” skips a controlling distinction. Read ACE fields as related identifiers, not one long number. For the check digit, convert filer-code letters with A/J=1, B/K/S=2, C/L/T=3, D/M/U=4, E/N/V=5, F/O/W=6, G/P/X=7, H/Q/Y=8, and I/R/Z=9 before applying the designated formula. ABC00481236 is valid: ABC is the filer code, 0048123 the seven-digit sequence, and 6 the numeric check digit; DDPP port and entry type are separate. Re-run the source route in Read the Header Level Information and Check Digit Computation Formula in ACE Entry Summary Instructions 2.4a. and state the decisive fact before selecting the result.

× Dropping leading zeros from the seven-digit assigned sequence.

✓ This shortcut fails because “Dropping leading zeros from the seven-digit assigned sequence.” skips a controlling distinction. Read ACE fields as related identifiers, not one long number. For the check digit, convert filer-code letters with A/J=1, B/K/S=2, C/L/T=3, D/M/U=4, E/N/V=5, F/O/W=6, G/P/X=7, H/Q/Y=8, and I/R/Z=9 before applying the designated formula. ABC00481236 is valid: ABC is the filer code, 0048123 the seven-digit sequence, and 6 the numeric check digit; DDPP port and entry type are separate. Re-run the source route in Read the Header Level Information and Check Digit Computation Formula in ACE Entry Summary Instructions 2.4a. and state the decisive fact before selecting the result.

× Applying Read ACE Entry Summary header identifiers without proving both the decisive fact and the controlling source edition.

✓ Read ACE fields as related identifiers, not one long number. For the check digit, convert filer-code letters with A/J=1, B/K/S=2, C/L/T=3, D/M/U=4, E/N/V=5, F/O/W=6, G/P/X=7, H/Q/Y=8, and I/R/Z=9 before applying the designated formula. ABC00481236 is valid: ABC is the filer code, 0048123 the seven-digit sequence, and 6 the numeric check digit; DDPP port and entry type are separate. Navigate the controlling material through Entry Summary Header Level Information → Entry Number, District/Port of Entry, Entry Type, and Check Digit Computation Formula; Part 142 → Subpart B → entry-summary form and electronic filing framework; Preparing for the CBLE → Reference Materials → ACE Entry Summary Instructions Version 2.4a. Record the decisive text and fact rather than relying on memory or a search snippet. For the October 2026 CBLE, use the designated edition; for live work, separately date and verify the current source rather than blending the two lanes.

Frequently asked questions

Which fact controls first when applying Read ACE Entry Summary header identifiers?

Read ACE fields as related identifiers, not one long number. For the check digit, convert filer-code letters with A/J=1, B/K/S=2, C/L/T=3, D/M/U=4, E/N/V=5, F/O/W=6, G/P/X=7, H/Q/Y=8, and I/R/Z=9 before applying the designated formula. ABC00481236 is valid: ABC is the filer code, 0048123 the seven-digit sequence, and 6 the numeric check digit; DDPP port and entry type are separate. Start with ACE Entry Summary Instructions, Version 2.4a, identify the trigger and any exception, and use the decision path before calculating or choosing a familiar label.

Where should I verify Read ACE Entry Summary header identifiers for the exam and for live work?

Use the cited exam-edition source cards for the October 2026 CBLE and preserve their pinpoint text. For a live transaction, separately re-check the current statute, eCFR, HTS, or CBP operational source listed for this chapter; a newer source does not silently rewrite the exam edition.

Official sources and editions

Key Terms

Entry Summary|报关单
CBP Form 7501|CBP 表格 7501
Liquidation|最终结算
Importer of Record|备案进口商
Protest|抗议

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Back to Knowledge BaseUpdated 2026-04-09