The 70/30 Inventory Split: A D2C Brand's Guide to Q4 Prep at Your 3PL

If your brand ships 500+ orders each month, Q4 inventory planning cannot wait until October.

By then, your fastest-moving SKUs should already have a clear allocation plan. Your FBA shipments should be mapped. Your D2C stock should be visible across every store. Your overflow should be secured and ready to move.

A practical framework for many established Amazon and Shopify brands is the 70/30 inventory split:

• 70% positioned for active fulfilment
• 30% retained as a controlled buffer

This is not a fixed rule for every SKU. It is an operating framework designed to protect availability without sending every unit into a single fulfilment channel.

At EASYADD, we are active sellers on Amazon and eBay. We see the current marketplace pressures daily: changing demand, courier delays, inbound receiving time, labelling requirements, bundle complexity and margin pressure.

We are First Aid for Amazon sellers.

We rescue your labelling, store your overflow, and connect your D2C across 70+ platforms with unlimited SKU combinations.

What the 70/30 split actually means

The 70/30 model separates stock by operational purpose.

The first 70% is positioned where orders are fulfilled immediately. Depending on your model, that could mean:

• Amazon FBA inventory
• Your D2C pick face at a 3PL
• Marketplace-ready stock
• Stock allocated to a known promotional campaign

The remaining 30% stays under controlled ownership as a buffer. It is not forgotten stock. It is not unmanaged surplus.

It is available inventory held back to protect you from:

• A sudden sales spike
• A delayed supplier shipment
• FBA receiving delays
• A labelling or prep issue
• A failed promotional forecast
• A temporary stock imbalance between channels

A simple example

Suppose your forecast requires 10,000 units across Q4.

Inventory position	Allocation	Units	Purpose
Primary fulfilment allocation	70%	7,000	Available for immediate customer demand
Controlled 3PL buffer	30%	3,000	Released through planned replenishment
Total planned stock	100%	10,000	Q4 demand plan before additional safety adjustments

The split should be calculated by SKU, not simply across your entire catalogue.

Your hero product may require a 60/40 split because demand is volatile. A stable accessory may work at 80/20. A seasonal bundle may need a larger buffer because both demand and preparation time can change quickly.

The important point is control.

You should know:

• Where each unit is located
• Which units are sellable now
• Which units are in transit
• Which units are reserved
• Which units require labelling, kitting or inspection
• When your buffer must be released

Why mid-August is the right time to plan

Mid-August is the point where serious sellers should move from broad forecasting to operational preparation.

There is still time to correct an allocation. There is less time to recover from a missed production window, an incorrect barcode or an unplanned FBA rejection.

Your Q4 plan should now include:

✅ A SKU-level demand forecast
✅ A channel allocation for Amazon, Shopify and marketplaces
✅ Confirmed supplier and transit lead times
✅ FBA prep requirements
✅ A buffer location and release process
✅ A weekly inventory review from September onwards
✅ A clear final despatch timetable for peak

Amazon’s FBA Inventory report includes useful metrics such as available stock, inbound quantities, sales over 7, 30, 60 and 90 days, days of supply, reserved inventory and recommended order quantities.

Use those figures alongside your own Shopify and marketplace data. No single channel report gives you the complete picture.

Step 1: Forecast Q4 demand by SKU

Start with your actual sales velocity.

For each important SKU, review:

• Average daily sales over the past 30 days
• Average daily sales over the past 90 days
• Last year’s Q4 performance
• Current advertising and promotional plans
• Price changes
• Planned product launches
• Bundle and multipack demand
• Marketplace-specific growth

A basic calculation might look like this:

Q3 average daily sales × expected seasonal uplift = estimated Q4 daily sales

For example:

• Q3 average: 30 units per day
• Expected Q4 uplift: 1.5 times
• Estimated Q4 daily demand: 45 units per day

Do not use one growth percentage for every product. Classify your catalogue:

Core SKUs

Reliable, consistent sellers.

• Use recent sales history
• Maintain a measured buffer
• Review weekly during peak

Hero SKUs

High-volume products that drive revenue, ranking or advertising performance.

• Use the upper end of your demand range
• Add more safety stock
• Prepare replenishment before the buffer is needed

Seasonal or promotional SKUs

Products affected by gifting, campaigns or a short sales window.

• Include campaign dates
• Confirm production deadlines
• Pre-plan bundle and packaging requirements
• Avoid sending the entire forecast to FBA at once

Long-tail SKUs

Slower-moving products with less predictable demand.

• Keep the active allocation lean
• Hold stock in flexible storage
• Avoid creating unnecessary FBA storage exposure

Step 2: Allocate the 70% to the right primary location

The primary location is where stock needs to be available for immediate fulfilment.

For an Amazon-led business, that may be FBA. For a Shopify-led brand, it may be your 3PL’s pick face. For a multi-channel seller, it may be a combination of both.

The decision should reflect your real order flow.

Business model	Primary 70% allocation	Buffer 30% allocation
Amazon-led seller	FBA-ready stock and active inbound shipments	Cartons held at a 3PL for replenishment or rescue
Shopify-led D2C brand	Pick-and-pack stock at the 3PL	Container-based overflow stock
Multi-channel seller	Split between FBA and D2C based on demand	Centralised buffer controlled by the 3PL
Bundle-heavy catalogue	Sellable components and confirmed kits	Unassembled components ready for controlled kitting

The primary allocation should not include stock that is still awaiting inspection, relabelling or a final prep check.

Treat stock as available only when it is genuinely sellable.

That distinction matters. A carton in transit is not the same as a carton received. A unit with an incorrect barcode is not sellable FBA stock. A bundle missing one component is not a complete D2C product.

Build your plan around verified stock, not optimistic stock.

Step 3: Keep the 30% buffer flexible

The buffer is where the 70/30 model creates operational resilience.

It gives you a controlled reserve without forcing every Q4 unit into your primary fulfilment channel at the same time.

For many brands, the buffer works best as container-based overflow storage.

This can provide:

• Flexible capacity
• No rigid long-term warehouse lease
• Clear carton-level organisation
• Controlled replenishment into FBA or D2C
• A secure location for seasonal and promotional stock
• Space for packaging, components and slow-moving SKUs

The buffer should have a release process.

For example:

1. Review each SKU every week.
2. Compare sellable stock with forecast demand.
3. Check open purchase orders and inbound shipments.
4. Identify any SKU approaching its reorder point.
5. Release the next carton or pallet from overflow.
6. Update the inventory position across every connected store.

This prevents two common Q4 problems:

Problem: You send everything into FBA

Solution: Keep a defined proportion outside FBA so you can respond to demand changes, prepare additional units and protect cash flow.

Problem: Your D2C warehouse becomes crowded with peak stock

Solution: Use flexible overflow storage and move stock into the pick face according to a measured replenishment plan.

Problem: Your forecast changes after a promotion launches

Solution: Keep the buffer accessible. Do not lock the entire season’s stock into one channel before demand is proven.

Step 4: Calculate your reorder point

Your reorder point should reflect both demand and lead time.

A practical formula is:

Reorder point = average daily sales × total lead time + safety stock

Total lead time should include:

• Supplier production
• Collection
• International or domestic transit
• Goods-in
• Inspection
• Labelling or kitting
• FBA shipment creation
• Amazon receiving
• Final sellable status

For Q4, use a realistic lead-time allowance. FBA receiving and transfers may take longer during peak periods. Supplier and courier schedules can also become less predictable.

Example

A hero SKU sells an estimated 50 units per day during peak.

• Total lead time: 35 days
• Safety stock: 30 days
• Lead-time demand: 1,750 units
• Safety stock: 1,500 units
• Reorder point: 3,250 units

When sellable stock plus confirmed inbound stock approaches that level, your next replenishment should already be moving.

Do not wait for the listing to show “low stock”.

Step 5: Protect Amazon stock with FBA labelling rescue

A 70/30 strategy only works if the buffer can be converted into sellable inventory quickly.

This is particularly important when stock arrives with:

• Incorrect FNSKU labels
• Unscannable barcodes
• Labels placed over a seam or corner
• Missing carton labels
• Incorrect bundle preparation
• Incomplete polybagging
• Missing suffocation warnings
• Cartons outside Amazon’s requirements

At EASYADD’s FBA preparation service, we receive, inspect and prepare stock for Amazon requirements, including:

✅ FNSKU and barcode labelling
✅ Polybagging and suffocation warnings
✅ Bundling and kitting
✅ Carton labelling
✅ Pallet preparation and wrapping
✅ Goods-in inspection
✅ FBA-ready despatch

This is why we describe EASYADD as First Aid for Amazon sellers.

If a supplier sends stock that is not FBA-ready, the buffer becomes your recovery point. Stock can be inspected, corrected and prepared instead of remaining commercially blocked.

See our FBA labelling and polybagging guide for a practical preparation checklist.

Step 6: Connect your D2C operation across every store

Q4 demand rarely comes from one channel.

Your stock may be sold through:

• Shopify
• Amazon
• eBay
• OnBuy
• TikTok Shop
• Etsy
• Temu
• Other marketplace channels

EASYADD connects D2C fulfilment across 70+ platforms, with support for multi-store connectivity and unlimited SKU and bundle combinations.

That matters when one product has several selling formats:

• Single unit
• Two-pack
• Gift set
• Subscription box
• Marketplace-specific bundle
• Seasonal kit
• Promotional multipack

Your fulfilment operation should understand how those combinations affect stock consumption.

A two-unit bundle must remove two components from available inventory. A kit may require separate inspection before dispatch. A marketplace order may need a different label, carton or service level.

When order and inventory data sync correctly, you retain control over:

• Sellable stock
• Channel allocation
• Bundle components
• Tracking updates
• Dispatch performance
• Replenishment decisions

Your August Q4 checklist

Use this checklist before the end of August.

Forecasting

• Rank SKUs by revenue and unit velocity
• Calculate 30-day and 90-day sales averages
• Apply a realistic Q4 uplift
• Mark hero, seasonal and bundle-heavy products
• Include campaign and advertising plans

Inventory split

• Allocate approximately 70% to primary fulfilment
• Allocate approximately 30% to controlled buffer stock
• Adjust the split by SKU where necessary
• Exclude uninspected or non-sellable stock from available inventory
• Confirm the location of every carton and pallet

FBA preparation

• Confirm FNSKU requirements
• Check barcode placement and scan quality
• Confirm polybag and warning requirements
• Review bundle and kitting instructions
• Prepare carton and shipment labels
• Agree a rescue route for non-compliant stock

D2C operations

• Connect every active store
• Test inventory synchronisation
• Validate unlimited SKU and bundle combinations
• Confirm carrier services and cut-off times
• Review returns and inspection procedures

Weekly peak controls

• Review sellable units
• Review inbound and receiving stock
• Check days of cover
• Release buffer stock before the reorder point is breached
• Recalculate forecasts as demand changes

Make your buffer operational before peak begins

The 70/30 split is not about storing stock and hoping the numbers work.

It is about creating a verified, visible and controlled inventory plan.

Your primary location serves current demand. Your buffer protects the next decision.

With the right process, you can:

✅ Reduce the risk of stock-outs
✅ Limit unnecessary FBA over-allocation
✅ Keep seasonal stock secure
✅ Correct labelling problems before they become lost sales
✅ Manage Shopify, Amazon and marketplace demand from one operation
✅ Protect dispatch metrics during the busiest trading period

EASYADD is a family-run fulfilment partner for established D2C, Amazon FBA and marketplace sellers. We are active sellers ourselves, with live daily insight into the decisions that affect margin, stock availability and customer experience.

Review your 70/30 split now. Which SKUs need more buffer? Which cartons are not yet FBA-ready? Where will your Q4 overflow sit?

For a direct conversation with Rachel, call +44 20 4513 0603, or review our transparent fulfilment pricing.