How to Request an Amazon Capacity Limit Increase

1. What Is an Amazon FBA Capacity Limit

Amazon gives every FBA seller a monthly capacity limit measured in cubic feet. That number controls how much inventory you can have at Amazon's fulfillment centers.

Before 2023, Amazon used ASIN-level restock limits. They scrapped that system and moved to a single account-wide capacity limit. Now one number governs everything you ship in, across all your products.

The limit resets monthly. Amazon publishes the new number a few days before the start of each month. Miss the announcement and you can end up with a rejected shipping plan right when you need space the most.

This problem gets worse as you grow. For the full breakdown of how the limit system works alongside other inventory restrictions, read the guide to Amazon FBA restock limits.

2. Why Sellers Hit Their Limit Fast

The limit is based on your past performance. It ignores your current growth rate. Scale 20-30% month over month and last month's limit is already too small for this month's buys.

I hit this wall hard my first Q4. I had $40,000 in inventory ready to ship and Amazon wouldn't accept the inbound. My limit was maxed out from slow-moving units sitting at the FC doing nothing.

If you only think about capacity when you're already blocked, the peak window is closing by the time you open a case.

Requesting an increase is straightforward. Do it weeks before you need the space.

3. How Amazon Calculates Your Capacity Limit

Amazon uses three main factors: your IPI score, your sell-through rate, and your excess inventory percentage. All three feed the algorithm that sets your monthly number.

IPI score is the most discussed lever. You want it above 400 to avoid automatic restrictions. A score above 550 gives you the most flexibility and the highest baseline limits. The full breakdown is at how to improve your IPI score.

Sell-through rate matters just as much. Amazon wants inventory turning in 90 days or less. Units sitting for 180 days or more drag your limit down every month.

Excess inventory is the third lever. Any unit Amazon flags as excess hurts your score and tightens your capacity. Run lean, keep your turns high, and Amazon raises your limit over time.

4. Where to Check Your Current Limit in Seller Central

Log into Seller Central. Go to Inventory > Inventory Planning. Click the Capacity Monitor tab at the top of the page.

You'll see three numbers: your current limit in cubic feet, how much you've used, and how much you have left. Below that, Amazon shows the upcoming month's limit if it's already been published.

Check this tab weekly. If you only look when building a shipping plan, you're scrambling over something you could have fixed weeks earlier.

The Capacity Monitor tab is also where you'll find the button to submit an increase request.

5. When to Submit a Capacity Limit Increase Request

Request before you need it. Submitting when you're at 95% capacity with a truck ready to go is the worst timing. Amazon's process takes time and they don't expedite requests for urgency.

The right window is 3-4 weeks before you expect to need extra space. For Q4, that means submitting in September. For Prime Day, submit in May. Build the request into your Q4 inventory planning calendar the same way you schedule sourcing trips.

Also submit a request when your sales velocity spikes. If you've been doing $30K a month and you just had a $55K month, submit that week. Amazon's algorithm lags your actual growth by design. Don't wait for it to catch up.

I walk through capacity and inventory planning every Thursday at my free live training. Grab a seat and come see it live before the next session fills up.

6. Step-by-Step: How to Submit the Increase Request

The process inside Seller Central:

1. Go to Inventory > Inventory Planning > Capacity Monitor.
2. Click "Request Increase" next to the upcoming month's limit.
3. Enter the cubic feet you want. Amazon shows your current limit and their estimated limit for next month. Request 20-30% above their estimate if your sales data supports it.
4. Write your business justification in the text box. Most sellers write one vague sentence here and kill their request.
5. Submit. You'll get a confirmation email and hear back within 5-10 business days.

The form itself is simple. The justification box determines whether Amazon approves the full amount, a partial amount, or nothing at all.

7. What to Write in Your Business Justification

Type "I need more space for Q4" and Amazon ignores it. Back your request with data.

Write something like: "My average monthly sales for the past 90 days are $[X]. I have confirmed purchase orders totaling [Y] units scheduled to arrive in [month]. My current limit of [Z] cubic feet will not accommodate this inventory. I am requesting an increase to [requested amount] cubic feet based on confirmed demand."

Include specific numbers: month-over-month sales growth percentage, number of confirmed units, the SKU count you're stocking. Concrete data beats vague requests.

If your IPI score has been strong, mention it. "My IPI has been above 550 for the past 6 months" signals that you won't abuse the extra space with slow-moving inventory. That's the reassurance Amazon wants before they approve.

8. How Long It Takes and When to Follow Up

Amazon responds in 5-10 business days. During peak season, August through November, expect closer to 10-14 days.

If you haven't heard back in 10 business days, open a new case referencing your original case ID. Don't resubmit from scratch. Escalate the existing one with the case number included.

Sometimes Amazon approves a partial amount. They might grant 60% of what you asked for. Accept it, ship against the new limit, then submit a second request for the remaining amount. Multiple smaller requests can get you further than one large ask.

If Amazon denies the request, read the denial reason. They cite one of three things: low IPI score, high excess inventory percentage, or low sell-through rate. Fix the one they flagged, then resubmit.

9. Free Up Space While You Wait

Don't sit idle after submitting your request. Work the problem from both sides.

First, create removal orders for anything that's been sitting for 90-plus days with no sales. Dead inventory costs you storage fees and drags your capacity limit. The Amazon low inventory level fee guide explains what fees pile up the fastest so you know where to prioritize.

Second, audit your stranded inventory. Units that are stranded take up capacity but generate zero sales. Fix the listings or remove the units. The full process is at how to fix stranded inventory on Amazon.

Third, submit any pending reimbursement claims. Amazon sometimes loses or damages inventory. Those units still count against your capacity until the claim resolves. File them, get the space back, and use it for units that sell.

10. Your IPI Score Is the Long-Term Lever

Requesting an increase handles the immediate problem. Your IPI score sets your baseline limit every month without you having to file anything.

A seller at IPI 600 gets a higher capacity limit than a seller at 420. Pushing your score up by 50-100 points can add thousands of cubic feet to your baseline. Amazon sets it with no request from you.

"The truth is that most of the time there's no hard limit... despite what a lot of people are saying."

Order Cancellation and Capacity Limits for Online Arbitrage

If you believe your capacity is permanently capped, check your sell-through rate and excess inventory first. The limit is more flexible than it looks. Do the work on your account health and Amazon raises your limits.

11. Capacity Limits Are a Scaling Problem

If you keep hitting your limit month after month, your growth has outpaced your account health metrics. Stop filing requests. Tighten your operations.

"It's painful, it's frustrating because this is like credit is all you scale a [business on]."

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Credit limits, capacity limits, the frustration is the same. Fix the underlying metrics and Amazon raises your limits. Request the increase now to buy yourself time, then treat your IPI and sell-through rate as the real levers.

The full scaling playbook is at how to scale your Amazon FBA business. Read that after you submit your capacity request. The operational breakdown for hitting $100K a month is at scaling FBA to $100K per month.

12. Next Steps

The request is submitted. Pick your next move based on where your bottleneck is:

• How to Improve Your Amazon IPI Score - Fix the root cause of tight capacity limits so you stop hitting this wall every month.
• Amazon FBA Q4 Inventory Planning - Build your capacity requests into your Q4 game plan from the start.
• Amazon FBA Restock Limits Explained - Understand how restock limits interact with your capacity number.
• How to Fix Stranded Inventory on Amazon - Free up space immediately by resolving stranded listings before your next ship date.
• How to Scale Your Amazon FBA Business - The full scaling playbook once your capacity situation is sorted.