The duty regime is a call on your bank

The decision that belongs to two departments

Semarra imports USD 193,440 of fabric and trims for PO CLM-5182. Tamarask's tariff on that cloth is 12%, so the duty is USD 23,212.80. That is USD 0.4836 a shirt, or 38.1% of the margin. No garment export survives paying that, which is why every exporting country has a way of not paying it.

Course 12.5 owns those ways. It sets out the regimes side by side. It derives the consumption ratio a relief is granted against. It sits through the audit two years later, builds the annual running cost, and finds the volume below which a regime stops being worth having. If you need to choose a regime on customs and administrative grounds, that is the course.

This lesson asks a different question about the same choice. It is a question 12.5 deliberately does not ask, because it needs a number from lesson 1 of this course: what does each regime do to your bank facility?

Two routes, on the same order.

Route A — pay the duty and claim it back. Semarra pays USD 23,212.80 to customs on 3 April 2026 and funds it from its own cash, at the 15.0% a year its trim supplier effectively charges for stretched terms. It files after export and, on its own record, is paid on 24 February 2027 — 327 days after the cash left. It recovers 93% of what it claims, for reasons 12.5 explains in full. The claim file costs USD 480 to prepare.

• Cost of the money: USD 3,162.74
• Never recovered: USD 1,624.90
• Claim preparation: USD 480
• Total USD 5,267.64, or USD 0.1097 a shirt

Route B — have the duty suspended from the start. No cash leaves. Instead customs requires a guarantee for the suspended duty, and Ardhen Bank issues it: USD 23,212.80, live from the import on 3 April to reconciliation on 12 August, which is 131 days. Ardhen charges 1.8% a year on the guaranteed amount plus a USD 120 issue fee.

• Total USD 272.04, or USD 0.0057 a shirt

Route B is 19.4 times cheaper. Semarra's customs manager moved the factory onto it, and was right to.

What a guarantee actually is

A bank guarantee is a promise by Ardhen to pay customs if Semarra does not. Ardhen has advanced no money and will not unless something goes wrong, which is exactly why the fee is small. But Ardhen has taken on an obligation it may have to fund, and it counts that obligation against the same USD 900,000 limit that finances Semarra's fabric. Course 13.7 explains how a bank prices and books this family of instruments. What matters here is only that the line is one line.

So there are two ways to read route B. Which one is true is a fact about Semarra's bank rather than about Tamarask's customs.

If the facility has headroom, a guarantee costs its fee and nothing else. USD 272.04. Route B wins by a mile.

If the facility is full, the guarantee displaces lending Semarra would otherwise have used to make garments. It then has to be priced at what that lending earns.

Lesson 1 gives that price directly. The Ardhen limit of USD 900,000 supported 11.71 orders a year at USD 60,960 of margin each. So every dollar of limit, held for a year, carries USD 0.7929 of contribution. The guarantee holds USD 23,212.80 for 131 days, which is USD 6,605.63 of displaced contribution.

With a full facility, the regime with almost no fee is 30.6% dearer than the one everybody avoids. That reversal is invisible from the customs department. It is invisible from the finance department too, if finance only looks at fees. And it becomes visible in about four lines of arithmetic once somebody puts the two numbers on the same page.

Act as a trade finance analyst for a garment exporter. I am choosing between duty relief regimes and I want the comparison done on my BANK LIMIT as well as on fees, because a customs guarantee is a contingent liability that my bank counts against the same facility that finances my fabric. My facts: imported inputs per order [CURRENCY AND AMOUNT], duty rate [PERCENT], units per order [NUMBER], orders I have in the water at once [NUMBER], my facility limit [AMOUNT], advance percentage against order value [PERCENT], order value [AMOUNT], cash cycle in days [NUMBER], margin per order [AMOUNT], my own cost of money a year [PERCENT], the bank's fee for issuing a customs guarantee [PERCENT A YEAR AND ANY FIXED FEE], the days a guarantee stays live from import to reconciliation [NUMBER], and for a drawback route: the days from paying the duty to receiving the refund [NUMBER], the share of a claim actually recovered [PERCENT], and the cost of preparing a claim [AMOUNT]. Do the following. First, compute my contribution per dollar of bank limit per year: limit divided by advance percentage times order value, times 365 over the cash cycle, times margin per order, all divided by the limit. Second, price the pay-and-claim route: interest on the duty for the days it is out, plus the share never recovered, plus the claim cost. Third, price the suspension route twice — once on the guarantee fee alone, as it looks when my facility has headroom, and once with the limit it occupies valued at my contribution per dollar of limit per year. Fourth, tell me how many orders a year my facility supports before and after the guarantees are added, and turn the difference into money. Fifth, ask me whether my export credit agency will counter-guarantee a customs guarantee and at what weighting my bank would then count it, and rerun the comparison with that in place. Sixth, give me the exact question to put to my relationship manager, in one sentence. If any input I gave you makes the comparison impossible, say which one and stop rather than estimating it.

The mistake nobody made

Here is how it actually played out, and every step in it was correct.

Semarra's customs manager compared route A and route B on fees. Route B was cheaper by USD 4,995.60 an order, which is USD 58,478.06 a year at the old run rate, so he moved the factory across. The finance manager agreed. The general manager approved it. It was written up as a saving, and it was a saving.

Three months later Ardhen declined to open a fabric credit for the following order.

Semarra runs about four orders in the water at once, so four guarantees are live at any time. That is USD 92,851.20 of Ardhen's limit that had not been there before. Rerun lesson 1's four lines with that added to the per-order consumption:

• Limit consumed per order: 241,920 + 23,212.80 = USD 265,132.80
• Orders a year: 10.68, down from 11.71
• Orders lost: 1.02 a year, at USD 60,960 of margin each, which is USD 62,476.20

Against USD 58,478.06 saved. The clear saving was a loss of about USD 3,998 a year. It took three months to appear, in a department that had nothing to do with the decision, on an order that had nothing to do with it either.

The fix is not to go back

The wrong conclusion is that route A was right after all. The right conclusion is that route B needed a banking decision beside it, and Semarra had already been offered one in lesson 3.

The Tamarask Export Guarantee Fund will counter-guarantee a customs guarantee. Ardhen then weights a counter-guaranteed obligation at 20% of its face value rather than 100%. Rerun the same lines with that in place:

• Limit consumed per order: 241,920 + 4,642.56 = USD 246,562.56
• Orders a year: 11.49
• Orders lost: 0.22 a year, which is USD 13,436.34

Against USD 58,478.06 saved, the switch is now worth USD 45,041.72 a year. The customs decision did not change. What changed is that somebody asked the bank what the guarantee would cost in limit, and then did something about the answer.

What you should be able to do now

Do three things before you change a duty regime.

1. Ask your bank how it weights a customs guarantee against your limit. The answer is a percentage, and it is not always 100%.
2. Multiply your duty per order by the number of orders you have in the water, and read that against your facility headroom. That is what the regime will occupy.
3. Convert it into contribution using lesson 1's figure — your annual margin divided by your limit — and put it in the comparison beside the fee.

Then, if the limit is what is binding, go and ask whether your export credit agency will counter-guarantee. That is a fortnight of paperwork, and it is worth more than the regime change itself.