Nobody talks about this stuff. Every guru shows you the $10K month screenshots, the "I quit my job" stories. Cool. Good for them.
But nobody sits you down and says "hey, here are the 6 things that are going to punch you in the face, and here is how to not bleed out when they do."
So let me be that guy.
I call these the Six Pillars of Pain. Not to scare you. This is a budgeting lesson. Every experienced seller has dealt with ALL six. The ones who survive planned for them upfront. The ones who didn't? They're the ones posting "Amazon FBA is a scam" on Reddit.
1. LOST INBOUND BOXES
You ship boxes to Amazon, and one shows up as "received zero." Amazon's warehouses process millions of packages. Things get lost. I lost my 7th box ever, about $400 worth of inventory. Could have quit right there. Kept going. You file for reimbursement, Amazon usually pays less than your cost. You eat the difference. Build a 5% shrinkage buffer into your projections.
2. INVENTORY SHRINKAGE
Beyond lost boxes, units just disappear inside Amazon's warehouses. Quantities don't match. At the end of every quarter you see how much is "lost." The silver lining: lost inventory that's partially reimbursed is a tax write-off as inventory shrinkage. Not ideal, but it softens the blow.
3. RETURN ABUSE
Here is the uncomfortable truth: the reason we can charge double the retail price is because customers know they can return whenever they want. There is a yin and yang to this. Amazon's return policy makes the marketplace work. It also lets people buy stuff, use it, and send it back as "defective." If you do FBM, customers pay return shipping unless it's your fault. That alone eliminates about 50% of abusive returns. FBA? Budget 3-5% of revenue for return losses.
4. RANDOM GATINGS
You source a product, buy 10 units, go to list it, and Amazon says you're not approved to sell that brand. This happens. It's frustrating. And it's random. Your options: return to the retailer (most accept returns within 30-35 days), sell on eBay at a small loss, or flip on Facebook Marketplace. The key is SPEED. The longer you wait, the harder it is to return. If you can't list it within a week, start your backup plan immediately.
5. BUY BOX SUPPRESSION
You see "See all buying options" instead of "Add to Cart." That's suppression. Amazon decided the price is too high. Here is the paradox: suppressed usually means expensive, which usually means there is money to be made. But volume drops 50-60% when the buy box is suppressed. Most buyers don't click through. You have to evaluate whether the reduced volume still makes the deal worth it.
6. IP COMPLAINTS
This is the one that scares new sellers the most. A brand or rights holder claims you don't have authorization to sell their product. In 4 years, I've had 4 IP complaints. Won 2, lost 2. The loss that stung: I bought from a small Shopify store that Amazon didn't recognize as a legitimate source. Lesson learned, stick to major recognizable retailers for your invoices. And remember, a listing-level complaint is NOT an account suspension. Don't panic.
THE PAIN BUDGET
Here is the real takeaway. Total realistic overhead from all six pillars: 8-12% of gross profit. That's it. That's the cost of doing business on Amazon Canada.
Build it into your projections and you'll never be caught off guard. When you project $500/month profit, plan your life around $450. The extra $50 is your insurance against reality.
Every business has costs like these. Restaurants deal with food waste and no-shows. Retail stores deal with shoplifting. This is our version. It doesn't mean the business doesn't work. It means you need to plan like a business owner, not a hobbyist.
What's the one that caught you off guard the most when you were starting out? Or if you're new, which one are you most worried about?