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.

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 your global revenue, not just what you're earning in that specific country.

Canada is a good example. Our tax experts flag this one often: 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.

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're obligated to start collecting tax from that point forward. Registration doesn't set your start date. Your sales do.

Waiting to register doesn't pause the clock. It just means you're accruing liability in the background while continuing to sell. When you finally do register, states and countries expect returns that cover all taxable sales from when you crossed the threshold, not from when you got around to signing 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 specifically to catch non-resident sellers who are collecting without remitting, or selling without collecting at all.

The mechanisms for finding non-compliant sellers are broader than many founders realize. Audits, marketplace data sharing, competitor reports, and payment processor flags all play a role. Once a business is flagged, penalties and interest 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. This requires looking at your actual transaction history, ideally 3 to 4 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 limits back tax exposure and puts you in a more cooperative posture with tax authorities.

💰 Start collecting from the right date. This is the step that often gets missed. Collection needs to align with your actual nexus start date — not your registration date.

🔎 Build monitoring into your process going forward. International thresholds shift. Countries update their rules for non-resident sellers. A manual approach to tracking this doesn't scale as your international footprint grows.

Visibility Across 100+ Countries

Kintsugi monitors nexus exposure across more than 100 countries, automatically tracking your transaction data to surface where obligations exist or are approaching. When you cross a threshold, you'll see it. And when it's time to register, file, or remit, the platform handles it in the same workflow as your US compliance.

International sales are worth celebrating. The compliance that comes with them doesn't have to be the part that catches you off guard.