Shopify Checkout, Markets, and Cross-Border Selling: What You Need to Act On Now

Two massive changes are converging on Shopify stores right now: the final phase of Checkout Extensibility and a redesigned Markets surface that unifies international, retail, and B2B selling in one place. Miss either deadline and you will feel it in your conversion rate. Get them right and you have a serious structural edge over competitors still running on legacy setups.

Let me break down what is actually happening, why it matters, and what to do about it.

The Checkout Extensibility Deadline You Cannot Ignore

Shopify has completed its multi-year move away from checkout.liquid. The new standard is Checkout Extensibility: custom apps and UI extensions that plug into checkout without touching underlying template files. The result is a checkout that survives Shopify platform upgrades without breaking every time a new API version ships.

If you are on Shopify Plus, your Thank You and Order Status page deadline passed in August 2025. If you are on a standard plan, your deadline is August 26, 2026. Miss it and Shopify auto-upgrades those pages for you, potentially breaking tracking pixels, custom scripts, and any post-purchase flows you have built on top of Additional Scripts.

The specific migration steps are straightforward: go to Settings > Checkout, open the upgrade report on your active configuration, and click Upgrade. If you have existing customizations via script tags or additional scripts, test everything in a staging environment before committing.

Beyond the deadline, Checkout Extensibility is genuinely better infrastructure. Your checkout branding settings now apply consistently across checkout, customer accounts, and sign-in pages, all from a single editor. Buyers can complete checkout for products that show positive inventory in their specific market even when total global inventory sits at zero or below, which removes a maddening false out-of-stock error for international customers.

The other hard deadline in this space: Shopify Scripts stop executing entirely on June 30, 2026. Scripts could not be edited or published after April 15, 2026. If your store uses Scripts for tiered discounts, shipping rules, or payment-method gating, migrating to Shopify Functions is the single most urgent technical task you have right now. The good news is that the 2026-04 API version already supports multiple product discounts per cart line, which is one of the most common reasons merchants leaned on Scripts in the first place.

What Is New in Shopify Markets

Markets shifted from a buried settings tab to a top-level surface in Shopify admin during 2026. It now aggregates international, retail, and B2B selling in one place. A single Shopify store can host up to 50 markets, each carrying its own currency, language, domain, product catalog, and theme customizations.

The parent-market and submarket model is the structural change worth understanding. You create a parent market (say, Europe, set to EUR), configure your catalog and theme, and then create submarkets underneath it (Germany, France) that inherit those settings but can override any single element. That inheritance model alone removes a huge amount of duplicated configuration work.

Theme customization just got meaningfully more granular too. Settings and app embeds can now be customized per market rather than applying globally, so your German storefront can surface different trust badges, payment icons, or promotional banners from your US storefront without publishing a separate theme.

A recent changelog entry worth flagging for merchants with multiple legal entities: you can now use multiple Shopify Payments accounts for different legal entities in the same country, managed from one store with Markets. That was previously a reason many larger operators kept separate stores.

Cross-Border Selling: The Duty and Tariff Reality in 2026

The cross-border opportunity is real. According to DHL data cited by Shopify, about 59% of global shoppers are willing to buy cross-border, with 35% doing so at least once per month. The mechanics of capturing that demand, however, involve a tax and duty layer that most merchants handle badly.

The data on why this matters is blunt: three-quarters of customers rethink shopping with a retailer after facing surprise customs duties, and 49% refuse delivery altogether. That is not a small conversion leak. It is a fundamental trust failure.

The fix is straightforward in principle: collect duties at checkout (DDP, Delivered Duty Paid) rather than shifting the burden to the buyer at the door (DDU/DAP). Shopify Markets supports this natively. You enable duties on a per-market basis, attach accurate HS codes to your products, and the platform calculates and collects the amount at checkout. The customer sees a clean total with no surprises.

For US-bound shipments specifically, the regulatory context shifted significantly in early 2026. As of August 29, 2025, de minimis no longer applies to shipments into the United States, meaning duties and import taxes apply to all US imports regardless of shipment value. Then on February 20, 2026, a US Supreme Court ruling invalidated tariffs imposed under IEEPA, and the administration followed with a temporary 10% import duty under Section 232 of the Trade Act effective February 24, running for 150 days. USMCA-compliant goods from Canada and Mexico are exempt, as are certain electronics, pharmaceuticals, and agricultural products. Section 232 tariffs on steel, aluminum, and autos remain in place regardless.

Shopify has been actively updating its duty calculation tooling in response. The Shopify admin now lets you customize the percentage of product value to which Section 232 steel and aluminum tariffs apply, which is useful if you sell products with mixed material compositions.

For merchants who want to remove compliance complexity entirely, Managed Markets (powered by Global-e) acts as your merchant of record internationally. It handles tax registration, remittance, local payment methods, customs documentation, and HS code assignment automatically. You do not need tax registration in the countries you sell to. Your payouts are processed daily through Shopify Payments. The cost is a 1.5% currency conversion fee per transaction, which for most merchants is a fair trade against the overhead of managing international VAT and GST registration manually.

A Practical Checklist for Cross-Border Setup

Here is what a properly configured international setup looks like in mid-2026:

• Upgrade your checkout now. Do not wait until August 26 and risk an auto-upgrade breaking your tracking.
• Migrate Scripts to Functions before June 30. If you are on Scripts, you are already past the edit-and-publish cutoff.
• Set up parent markets and submarkets for your highest-traffic international regions. Check your Analytics > Sessions by Location report to see where demand already exists.
• Enable DDP duties on each active market. Assign accurate HS codes to every product in your catalog. Bulk CSV import makes this manageable for large catalogs.
• Decide: self-managed Markets vs. Managed Markets. Self-managed (standard Markets) gives you control and lower fees. Managed Markets gives you compliance coverage and a guaranteed duty amount per order. High-volume international sellers generally benefit from Managed Markets.
• Customize themes per market. Use the Market dropdown in the theme editor to adjust trust signals, payment icons, and promotional content by region without creating separate themes.
• Lock in market-specific pricing. Do not rely on live exchange rate conversion if you operate in volatile currency pairs. Set fixed market prices and review them quarterly.

The Bottom Line

Shopify has built a genuinely capable cross-border infrastructure in 2026. The platform handles multi-currency, localized checkout, duty calculation, and per-market theming from a single admin. That removes the operational excuse for staying domestic.

The risk is not the technology. The risk is merchants who keep pushing these migrations down the to-do list until Shopify forces their hand with an auto-upgrade, or until an international customer gets hit with a surprise duty bill and leaves a one-star review. Both are avoidable. Start with the checkout upgrade and the Scripts migration. The cross-border layer follows naturally from there.