Why You Need Inventory Management When Selling on Marketplaces

"The Marketplace Tracks Everything — Why Do I Need More?"

This is the most common objection. And it's understandable: Ozon and Wildberries give you a dashboard with sales, revenue, analytics. Why duplicate it?

Because the marketplace tracks its data, not yours.

The marketplace knows how much it sold on your behalf. It doesn't know:

How much you paid for that product
How much it cost to ship to the marketplace warehouse
How much stock you have left at your own warehouse
What your real profit is after all expenses

That's your job. And for that you need inventory management.

Five Real Problems Without Inventory Tracking

1. You don't know your real profit

Revenue in your dashboard is not profit. It's money before subtracting the cost of goods.

Real formula: Profit = Revenue − Cost price − MP commission − Logistics − Storage − Advertising − Returns

Without tracking cost price you can't calculate profit accurately. Many sellers only discover they're working at a loss when the money runs out.

2. Stockouts destroy your search ranking

Product runs out → listing drops in search → when you bring a new batch, positions are already lost → you need advertising to get back up.

One stockout can cost weeks of promotional work.

3. Money frozen in slow-moving stock

Without stock analytics it's easy to over-order slow-moving products. Money sits in the warehouse instead of working.

4. Shipping errors

Without accurate stock levels managers work from memory or outdated data. Result: wrong items shipped, shortages, customer complaints.

5. Can't scale

Want to hire a second manager? Open another warehouse? Add a new marketplace? Without a tracking system every step of growth multiplies the chaos.

What Inventory Management Gives You in Practice

Real-time accurate stock levels — always know how much is where: your warehouse, FBO, in transit.

Automatic cost price (WAC) — system calculates weighted average cost per SKU on every receipt. You always know the real unit cost.

Low stock alerts — set minimum stock per product. System warns you when to reorder. No more stockout surprises.

Full movement history — who received, who shipped, when, how much. Complete audit without extra effort.

Real profit reports — see not just revenue but profit per SKU after all costs.

How to Choose an Inventory System

Ease of start — can you be up and running in 1-2 hours without implementation and training? If not — too complex for small business.

Price — free options exist with no limits. No reason to pay until your business has grown.

Multiple warehouses — if you use FBO plus your own warehouse, this is mandatory.

WAC built in — automatic weighted average cost calculation should be built in, not done manually.

Comparison of Popular Solutions

Feature	Excel	Typical paid system	SelSklad
Price	Free	From 1,500 ₽/mo subscription or 15,000+ ₽ rollout	Free
SKUs	Unlimited (slow)	Often “unlimited”, but bill rises with volume	Unlimited
Warehouses	Manual sheets	Yes; setup usually heavier	Unlimited
Documents/transactions	Unlimited (manual)	Paid tiers or costly implementation	Unlimited
Auto WAC cost price	No	Usually yes	Yes
Low stock alerts	No	Usually yes	Yes
Built for marketplaces	No	Partial or not at all	Yes
Setup time	Instant	From several days to weeks	1 hour
Support	None	Paid	Free

Where to Start Right Now

Create cards for all current products
Enter current stock balances
Start recording every receipt and shipment
After one month do your first inventory count

This takes 2-3 hours. After one month you'll know your real profit per product.

Frequently Asked Questions

Do I need tracking if I'm just starting out? Yes — now is the easiest time to start correctly. Switching from chaos to order later is harder.

Won't this take a lot of time? After setup — 5-10 minutes a day to record operations. Less than the time you spend fixing errors without tracking.

Do I need a developer to set it up? For SelSklad — no. Registration and first setup in 1 hour on your own.