If you import commercial goods into Canada, sooner or later you will see a Detailed Adjustment Statement. It arrives after the CBSA changes something about an import you already accounted for, and it spells out the new numbers. Understanding what a DAS is, why it lands in your account, and how to respond keeps a routine adjustment from turning into a missed deadline or an avoidable penalty. This guide walks through it in plain English.
What a Detailed Adjustment Statement is
A Detailed Adjustment Statement (DAS) is a document the Canada Border Services Agency issues to record an adjustment to an import that was already accounted for. In other words, you (or your broker) declared the goods, paid duties and taxes, and then something about that accounting changed. The DAS is the CBSA's official record of that change and of the new amount owing or refundable.
Historically, a DAS was tied to the B2 adjustment process, the paper request used to correct or re-determine an entry. Under CARM, adjustments and statements are handled electronically through the CARM Client Portal and the Commercial Accounting Declaration (CAD), which has replaced the older B3 and B2 forms. The underlying idea is the same: a DAS tells you the CBSA has revised an accounting and what the revision means for your account.
Worth knowing in August 2026: Canada's online customs system has had well-documented glitches since rollout. If a DAS shows up in your portal and something looks off — wrong transaction reference, numbers that don't match anything you filed — don't assume you misread it. The system has generated errors. Flag it with your broker before you pay anything.
Why the CBSA issues a DAS
A DAS is not random. It follows a specific event that changes how an import should have been accounted for. The most common triggers are:
- An importer-initiated correction. When you have reason to believe your accounting was wrong (for example, an incorrect tariff classification or value), you are required to correct it. The CBSA processes the correction and issues a DAS reflecting the new numbers.
- A CBSA re-determination. The CBSA may re-determine the tariff classification, the value for duty, or the origin of your goods, and adjust the accounting accordingly.
- The results of a trade compliance verification (audit). If a verification finds errors, the CBSA adjusts the affected entries and documents the outcome on a DAS. The CBSA's updated verification priorities for 2026 have expanded focus on steel, aluminium, and trade agreement compliance — so if you're in those sectors, your audit risk is higher than it was a year ago.
- Refund or drawback decisions. When a refund claim or drawback is approved, a DAS can record the resulting adjustment and the amount to be refunded.
- Surtax remission decisions. The CBSA has extended surtax remission on certain goods by two additional months as of this summer. If you applied for remission on U.S.-origin goods, watch your portal — remission approvals and corrections are generating DAS activity right now.
So a DAS can move money in either direction. Some statements show an amount you owe; others confirm a refund.
What is on a Detailed Adjustment Statement
A DAS sets out the revised accounting line by line so you can see exactly what changed. The fields you will typically find, and what each one tells you, look like this:
| Field | What it tells you |
|---|---|
| Transaction and line references | Which entry and which lines on it the adjustment applies to. |
| Revised classification (HS) | The tariff classification number the CBSA is now applying to the goods. |
| Revised value for duty | The corrected customs value used to calculate duties and taxes. |
| Revised origin or tariff treatment | Any change to the country of origin or the tariff treatment claimed. |
| Recalculated duties and GST | The new duty and GST amounts based on the revised figures. |
| Interest | Any interest the CBSA has assessed on an amount owing. |
| Net amount payable or refundable | The bottom line: what you now owe, or what is being refunded to you. |
Reading these fields against your own records is the fastest way to confirm the adjustment is correct and to understand which decision drove it.
A note on the current tariff environment
This matters right now more than usual. Canada's retaliatory tariffs on U.S. goods, the ongoing surtax situation, and CBSA guidance narrowing the scope of tariff relief have created a lot of moving parts. The CBSA has also been actively pursuing origin fraud — there's a $311 million case involving fraudulently labelled U.S. chicken that's been in the news, which gives you a sense of how seriously they're treating origin claims right now.
What that means practically: if you import goods where origin determines whether a surtax applies, your DAS risk is higher than it was two years ago. A re-determination of origin isn't just a classification tweak — it can flip you from a preferential rate to a 25% surtax on the same shipment.
The expanded verification priorities on steel and aluminium are worth flagging separately. If you're importing those products and claiming a trade agreement tariff treatment, the CBSA is looking at that paperwork more closely than before. A DAS following a verification in those categories can be substantial. Get your origin documentation in order before a verification finds the gap for you.
How to respond to a DAS
When a Detailed Adjustment Statement arrives, work through it methodically rather than just paying or ignoring it:
- Review it against your records. Match the transaction, lines, classification, value, and origin on the DAS to your own entry documents so you understand exactly what changed and why.
- Pay any amount owing by the due date. If the DAS shows a balance payable, pay it by the stated deadline to avoid additional interest building on the amount.
- If you disagree, dispute it. You can request a further re-determination or file a dispute with the CBSA. There is a limited time window to appeal — commonly 90 days — but confirm the current appeal period and process with the CBSA before you act. Missing that window closes the door.
- Keep your records. Retain the DAS and all supporting documentation. Importers are required to keep records for six years, and that paper trail is what supports any future correction or appeal.
How to reduce the DAS you receive
The most reliable way to see fewer adjustment statements is to get the accounting right the first time. Accurate tariff classification and valuation up front remove the two most common reasons the CBSA adjusts an entry, and a clean classification record makes the rest of your accounting easier to defend.
Origin documentation deserves its own mention right now. Given where enforcement attention is sitting in mid-2026 — expanded verification priorities, active origin fraud investigations, narrowing remission guidance — a weak paper trail on country of origin is a real liability, not a theoretical one.
That is where defensible, documented classification pays off. When every line is backed by clear reasoning and a written audit trail, you correct fewer entries, you respond to verifications with evidence already in hand, and the adjustments that do arrive are easier to check and, where warranted, to dispute. If a DAS also references a penalty, see our guide to AMPS penalties for how those are assessed separately.