The reality is that most VAT problems don't start at the VAT return stage. They start when products are purchased, listed, tracked and reported incorrectly throughout the quarter.

Start with the stock purchase

The first question every reseller should ask is:

"What is the VAT status of this item?"

When goods are purchased, businesses should immediately record whether they:

• Qualify for the VAT Margin Scheme
• Are standard-rated products
• Are zero-rated products

Many resellers discover too late that they don't have sufficient information to support the VAT treatment applied when the item is eventually sold.

The VAT decision should be made at the point of purchase, not months later when preparing the VAT return.

Get VAT right on your platforms

Once products reach Shopify or other sales platforms, the correct VAT status must follow them.

If products are listed with the wrong tax settings, every sale that follows may also be wrong. This becomes particularly important where businesses sell a mix of:

• New adult products
• Second-hand stock
• Children's products

Simple mistakes in product setup can create hours of correction work and potentially lead to incorrect VAT reporting.

Know how much profit you make on every sale

A surprisingly common issue amongst resellers is knowing revenue but not profit.

Selling a product for £50 tells you very little.

The more important questions are:

• What did it cost to buy?
• What fees were deducted?
• Was shipping included?
• Was a discount used?
• What VAT treatment applies?

Without this information, it's difficult to understand which product categories are genuinely profitable and which are simply generating turnover.

Good inventory and accounting systems should allow you to view profitability on an item-by-item basis, not just at an overall business level.

Track unsold Inventory

Inventory often receives attention when it's purchased and sold, but not when it remains on the shelf.

At the end of every VAT quarter, businesses should understand:

• What stock remains unsold
• How much capital is tied up in inventory
• Which products are moving slowly
• Whether purchasing decisions need adjusting

Strong inventory reporting helps improve cash flow and supports more informed buying decisions.

Don't just rely on your net payouts

One of the biggest issues e-commerce businesses make is using bank receipts as a substitute for sales data. The amount that lands in the bank rarely tells the full story.

A single payout may include:

• Sales income
• Refunds
• Discounts
• Marketplace fees
• Shipping income
• VAT adjustments

Without specialist e-commerce reporting tools, important information can be lost. This is where software integrations become invaluable.

Here's our recommended software stack

A2X to import detailed sales information into your accounts, including refunds, discounts, fees and shipping activity.

Dext to capture and organise supplier invoices, ensuring purchase records are readily available.

Xero to maintain accurate accounting records and support efficient VAT return preparation and submission.

When these systems work together, much of the manual processing disappears, reducing errors and improving visibility across the business.

Final thoughts

Successful resellers don't just track sales. They track VAT status, costs, margins, inventory and platform data throughout the entire product lifecycle.

The businesses that scale most effectively are usually those that implement the right processes early, ensuring they always know what they own, what they've sold, what profit they've made and what VAT they owe.

Because by the time you start preparing the VAT return, it's often too late to fix poor data. The real work happens long before the quarter ends.