The Peak Season Surcharge Letter Is Coming

Somewhere between Labor Day and the first pumpkin spice latte, an email is going to land in your inbox from your fulfillment provider. Subject line: something like “Important Update Regarding Peak Season Rates.” Translation: your shipping costs just went up, and nobody asked you first.

This isn’t a rumor. It’s basically an annual tradition in this industry, and if you’ve been running your own store for more than one holiday season, you’ve probably already gotten one of these letters. So let’s pull it apart BEFORE it shows up, while you still have leverage to do something about it.

The Email That Shows Up Every September

A common version of the letter runs three pages: peak-season handling fee, storage overage, and a volume surcharge that begins when an order count crosses a contractual threshold. The brand may not have changed its product or packaging, but the calendar changes the rate.

That can make November and December margins look very different from March. The operational cost may be real; the preventable problem is discovering the amount after inventory and campaign plans are already committed.

That’s the part that should bother you. Peak season is when your numbers need to make sense the most, and it’s exactly when a lot of 3PLs decide to quietly rewrite them.

What’s Actually Hiding in That Letter

Peak surcharge notices tend to reuse the same handful of line items, just dressed up in different fonts depending on the provider. Here’s what to actually look for:

• The peak handling fee. An extra per-pick or per-order charge that appears from roughly October through January, on top of your normal rate.
• Storage overage charges. You built up extra inventory to survive the rush, exactly like you were told to, and now you’re being billed more per pallet for doing it.
• Carrier peak surcharge passthrough. Carriers can add temporary peak fees to the transportation price. For example, ABC News reported a temporary USPS increase of $0.40 for certain 0 to 3 lb Priority Mail and Ground Advantage packages during the 2025 holiday period. Ask which account receives the charge and whether the fulfillment provider adds a markup.
• Dimensional-weight changes. A different measurement or packaging configuration can change the billable weight. Ask how and when dimensions are captured rather than assuming the original estimate will always apply.
• Minimum volume penalties. Fees for shipping too little, right alongside surcharges for shipping too much. There’s rarely a version of Q4 where you come out ahead.

The issue is not that every fee is improper; many are disclosed somewhere in the agreement. The issue is whether the amount and trigger were clear enough to plan around before Q4.

“Peak season surcharge” is often corporate-speak for: we didn’t plan for your growth, so now you’re paying for it.

Why This Keeps Happening (and Why It’s Not Really Your Fault)

Peak volume creates real pressure on labor, warehouse space, and carrier networks. Pricing can change because the work and underlying transportation costs change, not simply because a provider wants a new name for the same service.

Inbound Logistics’ 2026 3PL Perspectives research report found that 66% of surveyed 3PL operators cited rising operational costs as a top concern and 52% cited capacity as a major challenge. Those pressures explain why a peak charge may exist. They do not excuse hiding the amount or trigger until the last minute.

Add in real labor costs, real warehouse space constraints, and real carrier rate hikes like the one above, and some surcharges genuinely reflect actual added cost. The issue was never that peak season costs more to fulfill. The issue is brands finding out about it in September instead of March, with zero say in the matter and zero time to plan around it.

What Real Cost Transparency Actually Looks Like

ShipGenie publishes a $0.50 per-order peak-season surcharge for October 1 through December 31 on the same public rate card used for Shopify and WooCommerce fulfillment. Standard rates may be adjusted annually with 30 days’ written notice, and conditional or custom work is scoped before commitment.

Carrier charges are separate: clients use their own carrier accounts and rates, with no intentional ShipGenie markup on the label. There is also no monthly D2C order minimum, although product fit, capacity, and storage economics still apply.

Three Questions to Ask Before the Letter Shows Up

If you’re not ready to switch 3PLs right now, fine. At minimum, get your current partner to answer these three questions in writing before September:

• What exactly changes about my pricing between October and January, in dollars, not percentages?
• Are carrier peak surcharges passed through at cost, or marked up?
• Is there a volume threshold, high or low, where my per-order cost jumps?

If you get vague answers, or worse, silence, that tells you everything you need to know about what October’s inbox has in store for you.

Know Your Numbers Before the Rush, Not During It

You’ve spent all year building a brand people actually want to buy from. The last thing that should quietly eat your Q4 margin is a pricing surprise you had no way to see coming. Ask the hard questions now, while there’s still time to do something about the answers.