Reason codes. What R2-74-1 and R3-32-2 actually mean.

A Commercial Accounting Declaration adjustment carries a reason code, and the code is the legal argument compressed into one string. Appendix A of Memorandum D17-2-1 defines the term plainly.

"The code provided in CARM when making a change to an accounting declaration, which corresponds to the applicable legislative issue and reason for the request (e.g. R2-74-1-E.TC is provided when requesting a refund as a result of a tariff classification change)."

The memorandum does not spell out a formal grammar for the string, but every code in Appendix A follows the same shape once you know what to read for. The number right after the R groups the code by legislative family: R2 covers refund grounds under the Customs Act and the Customs Tariff, R3 covers corrections and CBSA-imposed assessments, R4 covers the Special Import Measures Act (SIMA), and R5 covers corrections filed before the CAD payment due date. What follows the family number is the section, and often the subsection, of the statute that authorizes the change. A suffix after a hyphen or period narrows it to the exact reason, such as .TC for a tariff classification change, .VFD for value for duty, or .TYPO for a clerical error.

Appendix A opens by saying these codes are for a trade chain partner, meaning the importer or an authorized representative such as a broker, to use when submitting a correction, an adjustment, a business number change, or a withdraw request on a CAD. A second block, covered further down, is reserved for CBSA itself. An adjustment can carry up to three reason codes at once, except a SIMA issue, which goes through a request for re-determination instead.

What do the R2 refund codes mean

Most R2 codes request a refund under section 74 of the Customs Act, the same section that covers damage, shortage, a tariff classification change, or a surtax paid in error. The rest sit under other sections of the Customs Act and the Customs Tariff: drawback, discretionary relief, diverted goods, an ex-warehouse correction, or a refund of the provincial portion of GST/HST or a provincial sales tax charged on the entry.

None of these codes puts a GST credit into your CARM account. CBSA will accept and decide a GST refund request raised on a CAD adjustment, but it does not issue the credit to the importer's account: a GST registrant claims it as an input tax credit from the CRA, and a non-registrant applies separately, using Form GST189 together with the Statement of Adjustment. See what happens to the GST on a refund for how that credit actually lands.

What do the R3 correction and assessment codes mean

R3 splits two ways. One set corrects a declaration under section 7.1 of the Customs Act with no revenue involved, such as a business number, cargo control number or country of origin change. Another set reports a change under section 32.2, the provision behind an importer's obligation to self-adjust once they have reason to believe a declaration was wrong. The remaining R3 codes are CBSA-imposed: a surtax or excise amount assessed after the fact, or a repayment demanded because a refund condition was not met.

The section 32.2 codes below are the ones you file inside the 90 day correction clock.

The memorandum's own worked example for splitting a CAD line pairs two of these codes. R3-7-1.QTY first moves quantity onto a new line with no financial impact, and once that step posts, R3-32-2-2.TC applies the corrected classification, along with the resulting duty, tax and interest, on the new line.

What do the R4 SIMA codes mean

A trade chain partner can use fifteen R4 codes, all under the Special Import Measures Act. Most mirror an R2 refund ground: a classification error, a value for duty error, a clerical error, none of them yet the subject of a decision. Two request a re-determination directly, within 90 days of the original determination: one for goods from the United States, the other for goods from a NAFTA or CUSMA country.

The first of those two is printed in the memorandum as R4.56.1.1, with dots, where every other code in Appendix A separates the family from the section with a hyphen. It is reproduced below the way CBSA prints it, because the point of a code list is matching the string on the document in front of you.

How do you correct an entry before the payment due date

An adjustment to a CAD can only be submitted after the payment due date and within the legislative time frame. A change needed before that date goes in as a correction instead, and Appendix A gives it one of four codes, depending on what changed.

Which codes can a trade chain partner not use

Appendix A draws a hard line right after the correction codes.

"The following reason codes are for CBSA use when initiating an adjustment, or when rejecting or denying a request from a TCP. They cannot be used by a TCP."

Two whole families are CBSA-only. Every R1 code is a re-determination CBSA issues on its own initiative, under section 58 or 59 of the Customs Act. Every R6 code is an appeal-stage decision, under section 60 or 61, including one that gives effect to a CITT, Federal Court or Supreme Court ruling. Inside R2 and R4, CBSA marks a denial of your own request by appending (DENY) to the matching code: R2-74-1-A(DENY) denies a damage claim you filed as R2-74-1-A. A representative sample of the CBSA-only list:

Filing one of these yourself will not create a valid adjustment. It identifies who acted, not what you are asking for, and a CBSA officer reviewing the request will reject it.

How to pick the right code for your adjustment

Start from the reason, not the code. If duty was paid on the wrong tariff classification and no decision has issued yet, that is R2-74-1-E.TC under the Customs Act, or R4-74-1-E.TC if SIMA duty was involved. If a surtax was paid in error, the code has to carry the exact Customs Tariff subsection that imposed it, for example R2-74-1-G-53 for the subsection 53(2) safeguard surtax, or R2-74-1-GR-53 for the same surtax recovered under a retroactive Order in Council, the code already used on a real claim on the surtax refund page.

Getting the legislative authority wrong is not a minor slip. If a CBSA officer reviewing an adjustment finds that the reason code names the wrong authority, the request is rejected outright, not corrected and processed under the right one.