Changelog

Goods of Canada on the lists in U.S. note 51 to Chapter 99 (headings 9903.03.12–9903.03.14) have owed an extra 50% under section 338 of the Tariff Act of 1930 since 22 August 2026, with more products added on 15 September. The calculators left it out until now, so every listed Canadian product came out too low. It is now its own layer, with its proclamation and start date, for 202 codes in the calculator's chapters: much of the furniture, seating, lamps and bedding in chapter 94, phones and other electronics, plastics, bags, some apparel, toys and steel structures. It stacks on MFN and the forced labor layer, and USMCA does not remove it. A cotton t-shirt from Canada (6109.10.00) goes from 26.5% to 76.5%, or from 0% to 50% with a USMCA claim. In category mode it applies to knit apparel, bags and toys, whose representative codes are listed. Two codes are only partly listed by 10-digit number (8537.10.91, 9507.10.00); for those the result leaves the layer out and asks you to check yours. Goods from other origins are unchanged. Rate alerts now name this layer when the Canadian lists change.

We re-checked the tariff data against USITC Revision 20, in force since 28 September 2026. No rate in the calculator moved: all 4,144 lines read the same in Revision 17 and Revision 20, and so do the Section 301 China lists, the four-year-review rates, the Section 232 metal and wood lists and the note 52 forced labor exemptions. Three Chapter 99 changes landed in between. Revision 18 added a Section 232 duty on drones, drone docking stations and some of their parts (headings 9903.08.20–9903.08.26, U.S. note 43, from 3 September 2026); drones themselves are outside the calculator's chapters, but two codes it covers carry statistical numbers on that list, 8504.40.95 (8504.40.9580) and 8537.10.91 (8537.10.9170), and now show a warning. The duty is not computed, and unlike the metal and wood lists it does not remove the forced labor layer. Revision 19 lengthened the list of Canadian goods under headings 9903.03.12–9903.03.14 (U.S. note 51), which this calculator does not apply, and Revision 20 added a clinical-trials carve-out from the pharmaceuticals duty (9903.04.70). Separately, the calculators now have a box for goods under an antidumping or countervailing duty order. CBP requires a formal entry for those at any value, so the merchandise processing fee and harbor maintenance fee are priced as a formal entry even below $2,500. The AD/CVD duty itself is still not computed.

The break-even ROAS page now ends its benchmark section with the four levers that actually move the floor, each worked through on the same $49 tee: a $5 price rise, two units per order, half the returns, and a different origin. Every figure is computed by the calculator engine. The blended ROAS and MER pages now say plainly which one to use for what. Guides and reference pages carry a byline: they are written by SuperLede, who also builds the calculators.

The tariff calculator now takes an 8-digit HTS code — 4,144 rate lines from the consumer-goods chapters of USITC Revision 17, each with its Section 301 heading from Chapter 99, including the 2024 four-year-review rates — and falls back to a category when you do not have one. Compound rates such as 76¢ per pair plus 32% are computed with a per-unit basis; the few multi-part rates the schedule writes in prose are marked unsupported rather than guessed. Twelve origins join China, Vietnam and India, with the net-of-MFN rule for the EU, Taiwan, Japan and Korea, a USMCA switch for Mexico and Canada and a KORUS switch for Korea, all from the USTR notice and HTSUS note 52; product exemptions under note 52 apply when you pick a code. Merchandise processing and harbor maintenance fees are spread over the units per entry, with informal entry up to $2,500 (CBP has suspended the lower $250 limit for goods with a Chapter 99 duty until further notice). Section 232 coverage, including the wood products list (upholstered wooden seating, kitchen cabinets), and AD/CVD orders are flagged, not computed. The same product is shown from three origins side by side, and the landed cost hands off to the break-even ROAS calculator with every switch intact. Save as SKU stays category-only for now: an estimate built on an HTS code or a trade-agreement claim is not offered for saving, because a saved SKU cannot store either yet.

Two new pages. The ROAS calculator divides ad revenue by ad spend like any other, then checks the result against your break-even ROAS and shows what the ads left you after costs. The guide to what a good ROAS is gives break-even and a buffered target for every common margin, the published figures by channel, and why the often-quoted 4x is only break-even for a 25% margin product.

New reference page: break-even ROAS for contribution margins from 20% to 60% against US duty rates from 0% to 50%, with a switch for how much of the selling price the product itself costs, since that decides how hard a given tariff bites. Every cell comes from the same engine as the calculators. The break-even CPA calculator now also answers the question most people search for it by: the maximum CPA you can pay for one order. The target ROAS calculator adds how to enter the target in Google Ads (a percentage) versus Meta (a multiple), and the three setting mistakes that most often choke delivery.

The tariff calculator page now explains how a US import duty rate is built, how to calculate it, what a China-to-USA example looks like next to Vietnam and India, what changed in 2026 and why there is no reciprocal tariff in the stack any more, and the difference between a tariff, a duty and a customs fee. The calculator opens on the same knit-apparel SKU as the homepage — $9.40 customs value, 36.5% combined, $3.43 duty — and hands that duty straight to the break-even ROAS calculator or a saved SKU. Every category rate was re-checked against USITC Revision 17 (issued 24 August 2026): all ten representative rates are unchanged; the quoted ranges for knit apparel, woven apparel and imitation jewelry now reflect the actual lowest and highest lines in their headings. The engine is unchanged.

The flagship calculator and the homepage were two pages competing for the same query, so the calculator's content — the formula, the per-input notes, the worked example with and without duty, the channel benchmarks, the questions and the sources — now lives on the homepage, and /break-even-roas-calculator redirects to it permanently. Nothing was dropped in the move; the old page's every figure is on the new one.

The step-by-step guide now carries a margin-to-floor reference table, a second pass at the flagship SKU through a 15% marketplace fee, and the floor restated as a Google Ads tROAS percentage and as a break-even CPA — every new figure computed by the calculator engine at build time, so it cannot drift from the tool. The flagship calculator page picks up two questions the search data surfaced: breakeven versus target ROAS, and what a dropshipping floor looks like with duty in it.

Four new pages: a step-by-step break-even ROAS guide using the flagship worked example, a ten-category analysis of what the end of de minimis did to dropshipping floors (every number computed by the same engine that runs the calculators), and honest comparisons against TrueProfit and against the spreadsheet.

Duty rates are snapshotted and compared daily. When one moves, confirmed subscribers get an email naming which layer changed and by how much — MFN, the China Section 301 lists, or the forced labor duty — rather than just that something changed. Alerts are idempotent: a rerun cannot send the same notice twice.

First public version. MFN rates pulled from the USITC tariff schedule (2026 Revision 16) rather than transcribed, with duty modelled as stacked layers so each one can be traced and diffed separately. Section 301 forced labor rates from the July 2026 USTR notice: China and Vietnam 12.5%, India 10%.

Packing invoiced separately from the goods is part of the dutiable value under CBP valuation rules. Treating FOB alone as the customs value understated duty on every unit. Packaging is now two inputs — paid before import, and added after — and only the first attracts duty.