Amazon FBA Q4 Inventory Planning: How Much to Send

1. Why Q4 Hits Different for FBA Sellers

Amazon FBA sellers who plan Q4 inventory right make serious money. The ones who skip the planning buy wrong products in wrong quantities and burn capital. Most wait until September or October to start thinking about it. Too late.

If you're reading this in July or August, you're ahead. If you're reading this in October, move fast. Either way, the framework below works the same.

Q4 (October through December) drives 2x to 4x normal sales velocity across most Amazon categories. Toys, electronics, home goods, and seasonal products spike hard. Online arbitrage sellers who plan inventory well can double monthly revenue without touching a single new product type.

2. Start Your Q4 Planning in July, Not October

Most Amazon sellers treat Q4 as an event starting in October. Q4 prep starts in July and August when you're building your product list and cash reserves.

The timeline I follow:

• July-August: Identify your Q4 product list. Pull your best sellers from the previous Q4. Check BSR history on Keepa. Build your target inventory list.
• September 1-15: Send first wave of inventory. Amazon's check-in times are still reasonable at this point. Give yourself buffer.
• September 15 - October 15: Send second wave. Monitor velocity and reorder fast movers.
• October 15 - November 15: Final top-up orders. After this, shipping times and inbound delays make it risky to send more.
• November 15 onward: You're in sell-through mode. Don't panic-buy. Focus on pricing and velocity.

Amazon's inbound processing slows in October and November. A shipment created on November 10 might not be available to sell until late November. That's a dead week during your most important selling period.

3. The Inventory Turnover Framework (This Is the Real Metric)

Most sellers obsess over ROI. That's a mistake when you're scaling. The number that determines how fast you grow is inventory turnover: how many days a unit sits before it sells.

"Inventory turnover, or the average day an item spent in your inventory - these numbers are way more important. Your inventory turnover, if you want to scale fast, is actually way more important than the average return on investment."

Chris Mangunza - Should You Buy Online Arbitrage Inventory DAILY? (Jun 29, 2024)

A product that normally turns in 30 days might turn in 10 during Q4. You get 3 capital cycles instead of 1. A product with a $10 net profit that turns every 30 days generates $30 net per unit of capital deployed over the same period.

When building your Q4 inventory list, prioritize products with strong historical Q4 velocity over high ROI. A 15% ROI product that turns in 8 days beats a 40% ROI product sitting for 60 days.

Check out how to calculate and improve your inventory turnover for the full breakdown on this metric.

4. How to Calculate Exactly How Many Units to Send

There's a formula for this. Most sellers skip it and guess. Don't.

Q4 Units to Send = (Daily Sales Velocity x Q4 Velocity Multiplier x Days of Coverage) + Safety Stock

Each variable:

• Daily Sales Velocity: How many units per day you're selling right now. Pull this from Seller Central sales reports or from Keepa's sales rank history.
• Q4 Velocity Multiplier: Most gift-able category products see 2x to 4x velocity in November and December. Check the product's BSR history in Keepa during prior Q4 periods to get your actual multiplier. Don't guess.
• Days of Coverage: How many days of stock you want to hold per send. I target 30 days of coverage, then top up. Some sellers go 45 or 60 days, which ties up more cash but reduces stockout risk.
• Safety Stock: Add 20-25% buffer for demand spikes and Amazon processing delays.

Example: You sell 2 units per day. Q4 multiplier is 3x. You want 30 days of coverage with 20% safety stock. Formula: (2 x 3 x 30) x 1.20 = 216 units per send.

If that product costs $15 landed and you want 30 days of coverage, that's $3,240 in inventory for one SKU. Run this math for every product on your Q4 list before you start buying.

5. Stagger Your Shipments - Don't Send It All at Once

Sending all your Q4 inventory in one big shipment in September is one of the most common and costly mistakes I see from sellers in The Scaling Society.

First, Amazon can limit your storage during peak season. If your IPI score drops, Amazon caps how much you can store in their fulfillment centers. You could end up with inventory stuck in a third-party prep center with nowhere to go.

Second, demand is unpredictable. You might think a product will be a Q4 winner and it doesn't move the way you expected. If you sent 500 units in September, you're paying storage fees on dead stock through January.

Send in 3 waves instead. First wave in early September covers you through mid-October. Second wave in late September or early October covers you through Thanksgiving. Third wave in early November covers you through December. Each wave is based on what's selling, not what you hoped would sell.

Staggering also helps cash flow. Instead of tying up $50,000 in inventory in September, you deploy $15,000-$20,000 per wave and use Q4 revenue to fund the next.

6. Which Products Deserve Your Q4 Budget

Not every product in your catalog belongs in your Q4 inventory plan. Capital is finite and Amazon's storage space is finite. Pick your spots.

Products that belong in your Q4 plan:

• Products that showed 2x or higher velocity in previous Q4 periods (check Keepa BSR history for October-December in prior years)
• Products in gift-able categories: toys, games, electronics, beauty, home goods
• Products with at least $8 net profit per unit after factoring in Q4 storage rates
• Products already moving for you now with consistent daily sales

Products to leave out of your Q4 plan:

• New-to-you products with no sales history. Q4 is not the time to experiment.
• Products with BSR above 150,000 in their main category, even if they move occasionally.
• Heavy or oversized products where Q4 storage fees will eat your margin.
• Products with multiple competing sellers who will likely undercut you on price in November.

"Scaling this business is easy - you just need to spend more money in inventory. That's it. What is easier if you want to spend $3,000: is it easier to buy 1,000 units of a $3 product, or is it easier to buy 60 units of a $50 product?"

Chris Mangunza - You Will Never Scale Your Amazon FBA Business (Apr 13, 2024)

Focus your capital on fewer, higher-priced products that sell fast. One $50 product moving 3 units per day beats ten $5 products trickling out one unit per day each.

For a deeper look at building a scalable product catalog, read the main guide at how to scale your Amazon FBA business.

7. How to Budget Your Q4 Inventory Capital

Q4 inventory planning without a budget is wishful thinking. I allocate capital heading into Q4 like this:

Start with your total available capital. This includes cash on hand, credit card limits you can use, and cash flow coming in from August and September sales.

Split it:

• 60% goes to proven Q4 winners from previous years. These are your safe, high-velocity products with verified Q4 lift. No guessing here.
• 30% goes to new products that have strong current sales velocity and look like Q4 fits based on category and Keepa history.
• 10% reserve for opportunistic buys. Q4 always surfaces unexpected deals - retailers clearancing out, price drops on products you know sell well. Keep cash available for these.

With a $30,000 Q4 budget, that's $18,000 on proven winners, $9,000 on new products, and $3,000 in reserve. You don't go all-in on unproven products, and you have cash ready when deals appear.

Learn more about managing cash flow through high-volume periods in this cash flow guide for FBA sellers.

8. Your IPI Score and Amazon's Storage Limits

Amazon assigns every seller an Inventory Performance Index (IPI) score. Drop below 400 and Amazon caps how much you can store in their fulfillment centers. During Q4, that cap costs you sales.

Three things kill your IPI score heading into Q4:

1. Stranded inventory: Products that are in FBA but not on active listings. Check your stranded inventory report weekly and fix or remove stranded ASINs immediately.
2. Excess inventory: Too many units of products that aren't selling. Amazon flags products where you have more than 90 days of supply on hand. If you have slow movers, drop the price to clear them before September.
3. Low sell-through rate: Products sitting in FBA for 90+ days drag your score down. Clear these before Q4 starts.

Target an IPI score above 500 by September 1. That gives you buffer. If you're sitting at 420 right now, spend August clearing dead stock and fixing stranded listings before you start sending Q4 inventory.

A seller with an IPI of 600 sends far more inventory than a seller at 380. More storage capacity in peak season means more Q4 revenue.

9. Avoiding Long-Term Storage Fees During Q4

Amazon charges long-term storage fees on units sitting in FBA for more than 365 days. During Q4, you also need to watch short-term storage fees, which spike in October through December.

Amazon raises per-cubic-foot storage rates in Q4. Rates for standard-size units jump from around $0.87 per cubic foot to $2.40 per cubic foot during peak season. That's nearly a 3x increase. Oversized products get hit even harder.

Factor Q4 storage fees into your unit economics before buying. A product with $6.00 net in July might return $4.50 net in November after the higher storage rates. A product with $3.00 net in July might barely break even in November. Most sellers skip this math and wonder why Q4 margins disappoint.

Pull up Amazon's FBA Revenue Calculator, adjust the storage fee input to reflect Q4 rates, and run your numbers before committing to a large buy. Use the Q4 fee schedule, not the standard rates.

For a full breakdown of how fees work year-round, check out this guide on minimizing Amazon FBA storage fees.

10. Cash Flow During Q4 - How to Keep the Machine Running

Q4 is the one time of year when cash flow management gets complicated fast. You're buying large amounts of inventory in September and October. Revenue from those buys doesn't fully materialize until November and December. There's a lag.

A few things that help bridge it:

• Switch to daily disbursements. Amazon defaults to 14-day payout cycles. Go to Settings - Account Info - Deposit Methods and toggle to daily. You get your cash back faster and stop waiting on a 2-week cycle during your busiest month.
• Use business credit cards with strong cash back. For sellers spending $10,000 to $20,000 a month on inventory, cash back alone can add $200 to $600 per month to the bottom line. Pay the balance before interest hits.
• Don't front-load everything in September. Stagger your inventory buys alongside your sales. Q4 revenue funds Q4 inventory if you sequence it right.

If you want to see this process in action, grab a free seat at my Thursday training where I walk through the exact cash flow system I use to manage $100,000+ months during Q4.

11. What to Do With Leftover Q4 Stock in January

Some stock won't sell by Christmas. Expect it. Shooting for zero leftover means you'll understock during peak weeks. Minimize the leftover.

When January hits with leftover Q4 inventory:

• Drop the price immediately. Don't hold out for Q4 prices in January. They're gone. Get your capital back and redeploy it into January and February products. A 10% loss recovered fast beats a 25% loss recovered slowly.
• Use removal orders when needed. For products not moving at any reasonable price, request a removal order. Amazon charges around $0.97 per standard unit. Then sell on eBay, Mercari, or Facebook Marketplace. You'll recover more than leaving it in FBA at $2.40 per cubic foot.
• Track your leftover rate. If more than 20% of your Q4 inventory doesn't sell by December 31, your demand forecasting needs work. Use that data to tighten your Q4 2027 plan.

The sellers who struggle after Q4 are the ones holding their prices and hoping for a rebound that doesn't come. Move the stock, recover the cash, and put it to work in January.

For more on keeping inventory moving year-round, check out this guide on online arbitrage sourcing strategy.

12. Next Steps

Q4 planning connects to every other part of scaling an Amazon FBA business. These posts cover the adjacent systems:

• How to Scale Your Amazon FBA Business - the full framework for going from $5K to $50K+ months
• Amazon FBA Inventory Turnover: The Metric That Actually Matters - how to calculate turnover and use it to grow faster
• Amazon FBA Cash Flow Management - how to keep cash moving when you're scaling fast
• Online Arbitrage Sourcing Strategy - how to find 20+ leads per day without burning hours
• Amazon FBA Storage Fees: How to Minimize Them Year-Round - the full breakdown on storage fees and how to protect your margins