Two Very Different Systems Built for the Same Problem

A dealer selling a nineteenth-century writing desk to a customer in another country is, whether they realize it or not, stepping into two fundamentally different tax philosophies depending on which side of the Atlantic that customer sits on. The United States taxes the transaction — a sales tax charged at the point of sale, administered state by state with no federal sales tax at all. The European Union and the United Kingdom tax the value added at each stage of a supply chain, with a specific and genuinely useful accommodation built in for secondhand goods that most American dealers have never encountered and most European dealers take for granted. Understanding both systems, even in outline, is essential for any dealer whose customer base extends beyond their home jurisdiction, and getting them wrong is one of the more expensive mistakes a growing antiques business can make. Nothing here should be treated as tax or legal advice for your specific situation — a qualified accountant or tax attorney familiar with your jurisdictions is the only reliable source for that.

US Sales Tax: The Nexus Problem

American sales tax is deceptively simple in concept and genuinely complicated in practice. Each state sets its own rate, its own exemptions, and — critically — its own rules for when an out-of-state seller is required to collect that state’s tax at all. The concept that determines this is called “nexus,” and it has expanded considerably since a landmark Supreme Court decision in 2018 established that a state could require tax collection from sellers with no physical presence in that state, based purely on the volume or dollar amount of sales made to its residents.

The practical consequence for a growing antiques business is that a dealer who starts out only needing to think about their home state’s sales tax rules can, as their online sales volume grows, cross economic nexus thresholds in other states without ever opening a location there. Most states set these thresholds around a certain number of transactions or a certain dollar amount of sales into that state within a calendar year, though the specific figures vary by state and change periodically, which means a dealer doing meaningful volume through an online shop or auction platform needs to actually track where their sales are going, not just assume their home state registration covers everything.

The moment a dealer’s shipping labels start accumulating a genuine spread of out-of-state addresses is the moment nexus stops being a theoretical concern and becomes an operational one.

A few practical realities worth understanding:

  • Marketplace facilitator laws in most states now shift the tax collection burden onto large platforms (major auction and marketplace sites) for sales made through them, meaning the platform, not the individual dealer, often handles collection and remittance — but this varies by platform and doesn’t apply to direct sales made outside that marketplace.
  • Antiques generally do not qualify for the “used goods” or “casual sale” exemptions that apply to occasional private individual sales; a dealer operating as a business is almost always required to collect tax on sales within states where they have nexus, regardless of the item’s age.
  • Resale certificates allow dealers to buy inventory from other dealers or at auction without paying sales tax at that purchase, on the understanding that tax will be collected when the item is eventually sold to an end customer — but using one requires proper registration and recordkeeping, and misusing a resale certificate for personal purchases is a genuine compliance risk.

VAT and the Margin Scheme

The EU and UK VAT systems work on an entirely different logic, and the accommodation built specifically for the secondhand and antiques trade — generally known as the margin scheme — is worth understanding in some detail, because it exists precisely to solve a problem antique dealers face constantly: buying stock from private individuals who aren’t VAT-registered and can’t issue a VAT invoice.

Under standard VAT rules, a registered business charges VAT on the full sale price and reclaims VAT paid on its own purchases. That works fine when a dealer buys inventory from another VAT-registered business. But a dealer who buys an antique clock from a private estate, where no VAT was ever charged on the original purchase, would face a genuine problem under standard rules — VAT would apply to the full resale price with nothing to offset, effectively taxing the same value twice.

The margin scheme addresses this by allowing eligible dealers to calculate VAT only on the difference — the margin — between what they paid for an item and what they sold it for, rather than on the full sale price. Broadly, and again subject to specific national rules that a dealer must confirm with a qualified adviser:

  1. The scheme generally applies to secondhand goods, antiques, works of art, and collectors’ items bought without VAT being charged (typically from private individuals, or from another dealer who themselves used the margin scheme).
  2. VAT is calculated on the margin, not the full sale price, which keeps prices for buyers meaningfully lower than they would be under standard VAT treatment.
  3. Dealers using the scheme generally cannot show VAT separately on the invoice or reclaim VAT on the purchase price of goods bought under it, and specific recordkeeping requirements apply to demonstrate eligible use of the scheme for each item.
  4. A dealer can typically choose, item by item in many jurisdictions, whether to use the margin scheme or standard VAT accounting, which matters when an item was bought from a VAT-registered source and standard input VAT recovery would actually be more favorable.

Where the Two Systems Collide

The genuine complexity for cross-border dealers arises at the seams between these systems. A US-based dealer selling to a UK customer must think about import VAT and customs duty the buyer may face on arrival (antiques over a certain age often qualify for reduced or zero import duty in various jurisdictions, though the specific age thresholds and documentation requirements vary and change). A UK or EU dealer selling into the US needs to think about US state sales tax nexus if their volume into particular states grows large enough, an obligation that has nothing to do with their home VAT registration.

Since the UK’s departure from the EU, UK-EU trade in antiques has also picked up its own additional layer of customs and VAT complexity that didn’t previously exist when both were part of the same customs union — a genuinely significant shift for dealers who built cross-Channel supply chains under the old rules and have had to rebuild their compliance processes since.

The Auction House as Tax Intermediary

Auction houses occupy a particular position in this landscape that’s worth understanding separately, because a dealer buying and selling regularly through auction encounters tax treatment that differs from a straightforward retail transaction. In the US, most auction houses collect sales tax on behalf of the states where they’re registered, applied to the buyer’s premium-inclusive total, unless the buyer presents a valid resale certificate at the time of purchase establishing that the item is being bought for resale rather than end use. Dealers who buy regularly at auction and fail to have their resale documentation in order at the point of sale often end up paying tax they’re not actually liable for and then have to pursue a refund process that varies in difficulty by state and by house — a genuinely avoidable cost that comes down entirely to paperwork discipline.

In the UK and EU, auction houses operate their own version of the margin scheme for many lots, meaning the VAT treatment a buyer sees quoted alongside a hammer price already reflects margin scheme accounting in many cases, distinct from the buyer’s premium itself, which is generally subject to standard VAT regardless of how the underlying lot was taxed. Houses selling significant works of art sometimes handle VAT differently again, since some jurisdictions apply reduced VAT rates specifically to imported art and antiques above certain value or age thresholds. The upshot is that the tax line on an auction invoice is rarely a single simple calculation, and dealers buying across borders through auction should read that invoice closely rather than assuming a flat percentage applies uniformly.

Digital Sales and Distance Selling Thresholds

The rise of online-only sales channels has added another layer worth flagging specifically for dealers who sell directly to consumers across borders rather than only through auction. Within the EU, distance selling rules mean that a dealer shipping goods to consumers in other EU member states above certain cumulative annual thresholds may need to register for VAT in the buyer’s country, or use a simplified one-stop-shop registration scheme designed to reduce the administrative burden of multi-country VAT compliance. A dealer shipping into the EU from outside it, including from the UK post-Brexit or from the US, faces import VAT and customs formalities on every shipment above a low de minimis threshold, with the buyer often responsible for those charges on delivery unless the seller has arranged to collect and remit them in advance through a delivered-duty-paid arrangement.

These distance selling and import VAT rules interact with antique-specific exemptions in ways that are easy to get wrong. Some jurisdictions apply reduced import duty rates to genuine antiques above a certain age — commonly referencing a hundred-year threshold in various customs frameworks — but the documentation required to substantiate that age to customs authorities is specific and not always straightforward to produce for objects without clear maker’s marks or dated hallmarks. A dealer regularly shipping internationally benefits considerably from working out these documentation standards in advance with a customs broker rather than discovering gaps in their paperwork when a shipment is held at a border.

Practical Habits Worth Building

Regardless of jurisdiction, the dealers who avoid painful tax surprises tend to share a few habits: they register for tax collection proactively in any jurisdiction where their volume clearly crosses a threshold rather than waiting to be asked, they keep purchase documentation — receipts, invoices, provenance paperwork — meticulously organized specifically because that documentation is what substantiates margin scheme eligibility or resale certificate use under audit, and they work with an accountant who has specific experience in the secondhand goods trade rather than a generalist, because the margin scheme and nexus rules are specialized enough that generic advice often misses the details that matter. None of this is a substitute for professional guidance tailored to your specific business and jurisdictions, but understanding the shape of both systems is the first step toward asking your adviser the right questions.