Where every number comes from
This page exists because the alternative is asking you to take our word for it. Every published rate this site uses appears below with its source, the date it took effect, the date we last read it, and an honest assessment of how well we can stand behind it.
Most recent individual source check: 21 Sept 2026. Found something out of date? Tell us — corrections get published with the date they were made.
What the confidence levels mean
Primary source 26 sources
Read directly from the organisation that sets the rate.
Corroborated 7 sources
Three or more independent sources agree, but we have not seen the issuer publish it.
Secondary source 10 sources
One or two third-party reports. Treat as a starting point and check your own account.
Unverified 0 sources
We could not confirm this. It is never used as a silent default — you have to enter it yourself.
Nothing marked unverified is ever used as a silent default. Those figures are offered as editable inputs, switched off by default, with a warning attached — because a number you can see and question is worth more than a number that quietly makes your answer wrong.
The full register
| Source | Publisher | Effective | Checked | Confidence |
|---|---|---|---|---|
| Etsy Payments: processing base and US fees US bank-account rate: 3% plus USD 0.25 on the gross order including shipping and applicable tax. Other bank countries have different schedules. | Etsy | — | 2026-09-21 | Primary source |
| DHL Express weight and dimensions Supports centimetres divided by 5000 and per-piece comparison with actual weight. It does not establish every local billing increment; the worksheet labels those increments as assumptions. | DHL | — | 2026-09-21 | Primary source |
| UPS US dimensions, billable weight and size limits US daily divisor 139; retail divisor 166; whole-pound billing; 150 lb, 108 inch length and 165 inch combined limit. This page includes conflicting general measurement wording; the preset follows its explicit round-up instructions. Confirm the governing service guide or contract. | UPS | — | 2026-09-21 | Primary source |
| Courier Imports Remission Order thresholds and exclusions General CAD 20 threshold; eligible US/Mexico courier shipments have CAD 150 duty and CAD 40 tax thresholds, inclusive. Shipment origin is different from origin of manufacture. Exclusions and separate surtaxes remain relevant. | CBSA | — | 2026-09-21 | Primary source |
| Customs Notice 26-23: United States Surtax Order Certain US-origin goods incur separate surtax, including eligible low-value shipments. The worksheet does not classify these goods or calculate that additional surtax. | CBSA | 2026-09-08 | 2026-09-21 | Primary source |
| EU low-value distance sales: duty per declaration line The temporary EUR 3 charge applies per declaration line to eligible distance sales up to EUR 150. Line grouping differs by H1/H6/H7 declaration, classification, description and origin. Enter a broker-confirmed line count. | European Commission | 2026-07-01 | 2026-09-21 | Primary source |
| DMM 113.1.3 — dimensional weight, and Notice 123 price list Read directly off the Domestic Mail Manual, revision 7-12-26. It states the divisor as 139, applies dimensional weight only to parcels exceeding one cubic foot (1,728 cubic inches), requires each measurement to be rounded up to the nearest whole inch before multiplying, and requires the result to be rounded up to the next whole number. Nonrectangular parcels multiply the cubic dimensions by 0.785 first. Notice 123, effective the same date, confirms the threshold and the 108-to-130 inch oversize band. | USPS Postal Explorer | 2026-07-12 | 2026-08-18 | Primary source |
| Notice 123 — Price List The complete published USPS tariff. Six tables are parsed directly from it — Ground Advantage, Priority Mail and Priority Mail Express, each in retail and commercial, 431 weight bands in total — and every row was checked for nine zone prices, prices that never fall as zone or weight rises, and the exact set of weight bands with nothing missing and nothing invented. Commercial was additionally verified to undercut retail at every comparable band. The PDF itself is kept in the repository and its SHA-256 recorded next to the numbers, so a reader can check them against the same document we read. USPS is the only carrier whose price tables are currently integrated here. Other carriers also publish rate guides; their prices are not integrated. | USPS Postal Explorer | 2026-07-12 | 2026-08-18 | Primary source |
| Parcel size, weight and fee standards Combined length and girth: 108 inches maximum for most services, 130 inches for USPS Ground Advantage. Between 108 and 130 inches the parcel is priced as oversize. | USPS | — | 2026-08-17 | Primary source |
| FedEx dimensional weight explanation This page supports the US 139 divisor. It is not a source for other carriers or global service-specific rounding. FedEx is not an active weight preset pending reconciliation with current service-guide rounding. | FedEx | — | 2026-09-21 | Primary source |
| EPAL Euro pallet dimensions and load ratings The 1200 x 800 mm Euro pallet footprint and its deck height come from EPAL, which issues the standard. The GMA (48 x 40 in), Asian (1100 x 1100 mm), Australian (1165 x 1165 mm) and half-Euro footprints in the same table are industry standards without a single issuing body and are corroborated across independent operators rather than read off one document. Maximum load figures are typical safe working loads: a specific pallet's rating depends on its condition and how the load sits on it. | European Pallet Association (EPAL) | — | 2026-08-25 | Primary source |
| Incoterms 2020 rules The ICC publishes and owns the Incoterms rules. Who bears cost and risk at each stage under DDP, DAP, CIF and FOB is taken from the 2020 edition. The full text is a paid publication, so the link is to the ICC's own rules page rather than to the clause text. Incoterms allocate cost and risk between buyer and seller; they do not change what duty or tax is owed, only who pays it. | International Chamber of Commerce (ICC) | 2020-01-01 | 2026-08-25 | Primary source |
| UPS fuel surcharge tables Fuel surcharges reset weekly against a published diesel-price bracket table. Any calculator that hardcodes a percentage is stale within days, which is why ours takes the current fuel price as an input. | UPS | — | 2026-08-17 | Primary source |
| NMFC density scale: the 13 subprovisions (Docket 2025-1) NMFTA expanded the Freight Classification Development Center density scale from 11 subprovisions to 13, splitting the old "30 pcf or greater" tier into 30–35 (class 60), 35–50 (class 55) and 50 or greater (class 50), and reclassified over 2,000 commodity codes. Note that many third-party charts still publish an 18-row table with breaks at 9 and 10.5 lb/ft³; those rows are from the generic commodity class list, not from the density scale. Density alone does not settle a class: stowability, handling and liability can all trigger a reclassification. | NMFTA (National Motor Freight Traffic Association) | 2025-07-19 | 2026-08-24 | Primary source |
| Suspending duty-free de minimis treatment for all countries Signed 2025-07-30, effective 2025-08-29, applying to all countries rather than only China and Hong Kong. The $800 exemption that most duty calculators still assume no longer exists. | The White House (Executive Order 14324) | 2025-08-29 | 2026-08-17 | Primary source |
| Suspension of duty-free de minimis treatment — fact sheet | US Customs and Border Protection | 2025-08-29 | 2026-08-17 | Primary source |
| Indefinite suspension of the de minimis exemption (CBP interim final rule) CBP Decision 26-12, docket USCBP-2026-0760, published at 91 FR 37789 on 2026-06-24 and effective the same day, covering every mode other than the international postal network; a companion rule at 91 FR 37801 covers mail and adds a postal informal entry process. Statutory repeal follows on 2027-07-01. Re-sourced on 2026-08-25: this entry previously cited tariffstool.com, a commercial competitor, and carried a note asking someone to confirm it against the Federal Register. Note that federalregister.gov blocks automated fetching, so the citation was confirmed through the published FR document number, volume and page rather than by reading the page directly. | US Customs and Border Protection, via the Federal Register | 2026-06-24 | 2026-08-25 | Primary source |
| E-commerce: €150 customs duty exemption threshold to be removed in 2026 Confirms removal of the €150 duty exemption and a temporary interim calculation method until mid-2028. The Commission page does not itself state the flat per-parcel amount — see the Council release. | European Commission, DG TAXUD | 2026 | 2026-08-17 | Primary source |
| Temporary €3 customs duty per item on low-value consignments Council Regulation (EU) 2026/382 of 11 February 2026, in the Official Journal of 30 April 2026, applying from 2026-07-01 until 2028-07-01. Upgraded from secondary on 2026-08-25: this entry used to carry a hedge saying the Official Journal text had not been checked, and the calculator modelled the duty as a flat per-parcel charge. The Commission guidance is explicit that the €3 applies to each different item according to its tariff heading — five identical T-shirts owe €3, a T-shirt and a watch owe €6. Most secondary coverage still calls it a per-parcel duty, which understates every mixed consignment. | European Commission, Access2Markets | 2026-07-01 | 2026-08-25 | Primary source |
| Selling on Amazon fee schedule Public page. Confirms referral fees of 5% to 45% by category, a $0.30 per-item minimum, the $1.80 media closing fee, and the $0.99 Individual versus $39.99 Professional plans. It does not publish the FBA size-tier rate card, which sits behind the Seller Central login. | Amazon | — | 2026-08-17 | Primary source |
| Update to European referral and Fulfilment by Amazon fees for 2026 Published by Amazon itself. The European fuel and logistics surcharge is 1.5%, not the 3.5% charged in the US and Canada — applying the US figure to a UK or German seller overstates their fulfilment cost by two points. | Amazon EU | 2026-04-17 | 2026-08-18 | Primary source |
| Zero referral fee on products under ₹1,000 From 16 March 2026 Amazon India charges no referral fee on roughly 12.5 crore products priced under ₹1,000, across more than 1,800 categories. A calculator that does not branch on the ₹1,000 line is materially wrong for the largest segment of Indian sellers. | Amazon India | 2026-03-16 | 2026-08-18 | Primary source |
| Update to US referral and Fulfilment by Amazon fees for 2026 Published by Amazon itself. Referral fees unchanged for 2026 — frozen since January 2024. Fulfilment fees up about $0.08 per unit on average from 15 January 2026. | Amazon | 2026-01-15 | 2026-08-18 | Primary source |
| eBay selling fees — final value fee and the $7,500 break US non-Store schedule. Most categories: 13.6% through USD 7500 then 2.35% marginally; specified media 15.3%; guitars 6.7%. Per-order fee USD 0.30 through USD 10 and USD 0.40 above. Store, special-category and seller-performance terms differ. | eBay | — | 2026-09-21 | Primary source |
| Etsy fee structure and regulatory operating fees Supports 6.5% transaction fee excluding US sales tax, USD 0.20 listing fee and eligible Offsite Ads terms. Not a source for all countries’ payment processing rates. | Craftybase | 2026-03 | 2026-09-21 | Primary source |
| Shopify plans and payment rates Plan prices and Shopify Payments rates vary by country and change on renewal. Confirm against the pricing page for your own region. | Shopify | — | 2026-08-17 | Primary source |
| IATA volumetric ratio for air cargo (1:6000) 6000 cubic centimetres per kilogram, equivalently 167 kg per cubic metre. This is why an air-freight quote and a courier quote on the same box differ: couriers use 5000, giving 200 kg per cubic metre. Marked corroborated rather than primary on purpose — the governing text is the IATA TACT Rules, which are a paid subscription and cannot be linked to a page a reader can open, so we link IATA's public cargo programme page and rely on agreement between independent forwarders for the ratio itself. | IATA | — | 2026-08-24 | Corroborated |
| LCL weight-or-measure (W/M) revenue tonne LCL is quoted per revenue tonne: whichever is greater of 1 cubic metre or 1,000 kg. This citation points at our own worked explanation rather than an external document because there is no issuing body to point at — W/M is commercial practice between carriers and forwarders, not a published tariff rule, and any third-party page stating it is doing exactly what we are doing here. We would rather say that plainly than dress up a competitor blog as an authority. | Ocean freight trade practice (no issuing authority) | — | 2026-08-24 | Corroborated |
| Published service transit windows and national holiday calendars Two datasets sit behind the delivery-date and transit-time tools, and neither is entered by the user. The first is each service's published transit window — FedEx Priority Overnight at one day, UPS Ground at one to five, Royal Mail Tracked 48, Worldwide Expedited at two to five plus a customs day, and roughly forty more. The second is 383 dated national public holidays across 18 countries for 2026 and 2027, applied at BOTH ends of the lane, with moon-dependent dates flagged approximate. Compiled rather than cited to a single document because no one document exists: transit windows come from each carrier's own service guide and several of those carriers refuse automated requests, and holidays come from each country's own calendar. Regional holidays and carrier-specific shutdowns are deliberately excluded — confirm with your carrier before promising a date around a holiday. | Carrier service guides and national public-holiday sources (compiled) | — | 2026-08-25 | Corroborated |
| ISO 668 — freight container internal and door dimensions Internal length, width, height, door opening, cubic capacity, tare and maximum payload for 20ft, 40ft, 40ft high cube and 45ft high cube boxes. The citation points at our own worked figures rather than at ISO because ISO 668 is a paid standard that cannot be linked to a page a reader can open, and iso.org refuses automated requests. The more useful caveat is that real boxes vary: internal dimensions differ by manufacturer and by age, so these are the nominal figures and your actual container may be a few centimetres off. The door opening is the constraint that catches people out — a 40ft high cube door is about 258 cm against an internal height of 269 cm, so a pallet that fits the box may not fit through the door. | ISO 668 (series 1 freight containers) | — | 2026-08-25 | Corroborated |
| Amazon FBA fee changes for 2026: three price bands From 2026-01-15 fulfilment fees split into three price bands — under $10, $10 to $50, and over $50 — instead of one fee per weight tier. Three independent sources agree. Most competing calculators still model a single fee per tier. | Goat Consulting | 2026-01-15 | 2026-08-17 | Corroborated |
| Amazon 3.5% fuel and logistics surcharge on FBA fees A 3.5% surcharge applied to the fulfilment fee itself, not the sale price, on FBA and Multi-Channel Fulfilment in the US and Canada from 2026-04-17 (2026-05-02 for MCF and Buy with Prime). Roughly $0.15 to $0.35 per unit on a standard item. | Fast FBA 3PL | 2026-04-17 | 2026-08-17 | Corroborated |
| eBay seller fees 2026 Standard final value fee 13.6% in most categories, plus a per-order fee of $0.30 on orders up to $10 and $0.40 above. The final value fee already includes payment processing under managed payments — adding a separate processing percentage double-counts, which at least one popular calculator appears to do. | Taxomate | 2026 | 2026-08-17 | Corroborated |
| Volumetric weight formula used by Indian courier aggregators Shiprocket applies L × W × H in centimetres divided by 5000. Downgraded from primary on 2026-08-24: Shiprocket is a reseller rather than a carrier, so its page is primary only for its own billing, not for the Indian courier market as a whole — and its own FAQ concedes the divisor "varies depending on the courier company" while its calculator offers no way to change it. Treat 5000 as the common default and confirm the divisor against your own carrier contract. | Shiprocket (aggregator, not a carrier) | — | 2026-08-24 | Secondary source |
| How to calculate UK duty and VAT UK import VAT is charged on the customs value plus duty plus freight, at 20% standard or 5% reduced. Duty relief applies below £135 but VAT does not. | Customs Support | — | 2026-08-17 | Secondary source |
| De minimis values by country The most complete public table of per-country duty and tax thresholds we found, but it carries no publication date. Every threshold sourced from it is editable in the calculator and flagged in the results. | Zonos | — | 2026-08-17 | Secondary source |
| Amazon FBA fulfilment rate card 2026 Amazon's own rate card is login-gated, so every third-party figure — including ours — is a secondary reproduction. Directionally consistent across four independent sources. Verify against your own Seller Central rate card before pricing a product on it. | AMZ Prep | 2026-01-15 | 2026-08-17 | Secondary source |
| FBA storage fee revision, July 2026 Resolved on a third research pass: the 0.78-versus-0.87 disagreement was a genuine mid-year rate change rather than a source error. 0.78 was in force January to June 2026 and 0.87 took effect on 1 July, which is what we now apply. Also the origin for the aged-inventory ladder, which starts at 181 days. The 366-to-455-day band remains disputed between 0.79 and 6.90 per cubic foot, so we apply the lower figure and warn on it. | ConversionPerk / NovaData | 2026-07-01 | 2026-08-18 | Secondary source |
| Digital Services Fee — Amazon Europe A percentage uplift applied to Selling on Amazon fees and FBA fees, recovering national digital services taxes. Reported as rising to 3% and expanding to UK, France, Spain and Italy from 2026-03-20. The exact seller-country by marketplace-country matrix is the part we are least confident about, so the rate is an editable input. | Amazon Seller Central (FR help hub) | 2026-03-20 | 2026-08-17 | Secondary source |
| Amazon Currency Converter for Sellers rate tiers Volume-tiered from 1.50% under $100k of revenue down to 0.75% above $10M. Reports of an additional 2.5% to 4% markup over the mid-market rate are unverified, so the calculator asks for your own observed rate. | Titan Network | — | 2026-08-17 | Secondary source |
| VAT charged on Etsy seller fees UK sellers pay VAT on Etsy's fees themselves, so the effective fee burden is materially higher than the headline percentages. Only one competing calculator models this. | ListingPrep | 2026-06-22 | 2026-08-17 | Secondary source |
| TikTok Shop seller fees 2026 Reports a US referral fee of 6% covering both commission and payment processing, and 9% in the UK. This conflicts with a widely repeated 8% figure for the US. TikTok has stepped its US commission more than once, so the calculator defaults to 6% but makes the rate editable and shows both figures. | Dashboardly | 2026 | 2026-08-17 | Secondary source |
| Walmart Marketplace seller fees Referral fees of 6% to 15% by category with no monthly subscription. | Aura | — | 2026-08-17 | Secondary source |
What we know we do not know
A few things are genuinely unresolved, and it seems more useful to list them than to pretend otherwise.
- Amazon's exact FBA rate card. Amazon publishes it only behind the Seller Central login, so every third-party figure — ours included — is a secondary reproduction. Check your own fee preview before pricing a product.
- The EU's interim parcel duty amount. The Commission has confirmed the €150 exemption is going. Secondary reporting describes a small flat duty per parcel from July 2026. We have not read the Official Journal text, so we ask you to enter the amount rather than assuming it.
- TikTok Shop's US referral rate. Sources disagree between 6% and 8%, and TikTok has stepped the rate more than once. We default to 6%, say so on the page, and make it editable.
- The Digital Services Fee matrix. The existence and the 20 March 2026 date are well corroborated. Which rate applies to a seller established in country A selling on marketplace B is less clear.
- Nigeria's additional import levies. Single secondary source. Switched off by default and flagged in the results.
- The USPS divisor change. Five independent operators report the same change and the same PRC docket, but we have not read it off Postal Explorer directly, which is why it is marked corroborated rather than primary.
How to challenge a number
If a figure here disagrees with your invoice, your invoice is probably right and we want to know. Send the source you are working from and we will either update the registry or explain why the two figures differ — sometimes it is an account-specific rate, sometimes it is a genuine error on our side. Either answer is more useful than silence.