You’ve got international orders trickling in. Canada, the UK, maybe Australia. It’s exciting—proof that your brand is resonating beyond the US. But it’s still a small slice of revenue, maybe 8 or 12 percent. At this point, many founders think: international tax compliance can wait until it’s a bigger deal.
This is one of the most common assumptions ecommerce founders make. And it’s one of the most costly.
Tax thresholds and registration rules vary by country, product, customer, and fulfillment model. This article is an educational overview, not tax advice; confirm current requirements with the relevant tax authority before acting.
If you are deciding whether a foreign registration is required, start with VAT and GST ID numbers and Do US companies have a VAT number?. They explain the identifiers, registration triggers, and validation steps that sit behind the broader exposure question.
Where the Threshold Actually Sits
The phrase “I haven’t hit their threshold yet” gets a lot of mileage in conversations about international compliance. The problem is that thresholds in many countries are lower than US sellers expect, and in some cases, they’re based on global revenue, not just what you’re earning in that specific country.
Canada is a good example. GST/HST registration thresholds for non-resident sellers can be triggered by worldwide taxable supplies, not just Canadian sales. That means a brand doing $10M in the US with a modest Canadian customer base may already be obligated to register. The applicable rule depends on the seller’s facts and the type of supplies, so verify the current requirement before relying on this example.
Registration =/= Collection
Even when a business recognizes that they’ll eventually need to register in a country, there’s a tendency to wait. The problem is that once you’ve crossed a nexus threshold—internationally or domestically—you may be obligated to start collecting tax from that point forward. Registration does not necessarily set your start date; the applicable rules and sales activity do.
Waiting to register doesn’t pause the clock. It can mean accruing liability in the background while continuing to sell. When you finally do register, states and countries may expect returns that cover taxable sales from when the obligation began, not from when you signed up.
“Small” Markets Still Mean Major Enforcement
There’s an assumption that smaller markets have less aggressive enforcement. In practice, that’s not reliably true. Countries with VAT and GST systems have built enforcement infrastructure to catch non-resident sellers who are collecting without remitting, or selling without collecting where collection is required.
The mechanisms for finding non-compliant sellers are broader than many founders realize. Audits, marketplace data sharing, competitor reports, and payment processor flags can all play a role. Once a business is flagged, penalties and interest can compound quickly, especially if the issue stretches back multiple years.
The Numbers Are Clear
Imagine international sales representing 10% of your revenue. That sounds manageable to sort out later. But if that 10% has been flowing through several countries for two or three years without proper registration, you’re not looking at 10% of a month’s revenue. You’re potentially looking at years of back taxes, plus penalties, plus the cost of retroactive compliance work to sort it out.
The “it’s small” logic tends to undercount the time dimension of the problem.
The good news is that international compliance doesn’t have to be as heavy a lift as it sounds.
- 💡 Identify where you’ve already crossed thresholds. Look at your actual transaction history, ideally three to four years back, across every country you ship to. Exposure often shows up in places founders didn’t expect.
- 📃 Register before the liability grows further. Once you know where you have obligations, registering sooner may limit back-tax exposure and put you in a more cooperative posture with tax authorities.
- 💰 Start collecting from the right date. Collection needs to align with the applicable nexus start date—not necessarily the registration date.
- 🔎 Build monitoring into your process going forward. International thresholds shift, and countries update their rules for non-resident sellers. A manual approach to tracking this does not scale as your international footprint grows.
Visibility Across 100+ Countries
Kintsugi monitors nexus exposure across more than 100 countries, automatically tracking transaction data to surface where obligations exist or are approaching. When you cross a threshold, you can see it. When it’s time to register, file, or remit, the platform handles it in the same workflow as US compliance.
See Kintsugi’s ecommerce solution to connect international tax monitoring with the systems that power your orders, or review VAT tax software for registration and filing workflows.
International sales are worth celebrating. The compliance that comes with them doesn’t have to be the part that catches you off guard.
Sales booming?
Your nexus might be too. Check your exposure today.
