Turning a Pokémon card collection into a UK side business: choosing what to sell, where to sell it, stock records and when HMRC treats it as trading.
Updated 6 October 2026
Before you start
Turning a Pokémon card collection into a UK side business: choosing what to sell, where to sell it, stock records and when HMRC treats it as trading.
Most Pokémon card businesses start with a binder of duplicates and a weekend of eBay listings. You move from hobby to business when you buy cards to resell.
Buying to resell changes how you buy, how you track stock and what you owe HMRC. Plan it before you start spending, and your first year costs less in mistakes and paperwork.
Kit for this
The products this guide uses, with typical UK prices.
Penny sleeves, 1,000 pack
Stops surface scratches before the card goes into a toploader. At this pack size each sleeve costs well under a penny.
Typical price£6 to £10
See on Amazon
35pt toploaders, 100 pack
Buyers on Whatnot and eBay expect any card worth more than a few pounds to arrive sleeved and top-loaded. A bent card means a refund.
Typical price£12 to £18
See on Amazon3,200-count card storage boxes
Sort singles by set and number with dividers, and you can pull a sold card without flicking through binders.
Typical price£10 to £18
See on AmazonBoard-backed card mailers, C6, 100 pack
A sleeved and top-loaded card in a rigid mailer stays flat through sorting machines and usually ships as a Large Letter, which costs far less than a parcel.
Typical price£10 to £18
See on Amazon
The guide
Each step in the order you'll need it.
Choose one lane to start
Pick one of three lanes: singles, sealed product or bulk lots. Singles need grading knowledge and good photos. Sealed product needs cash up front and patience.
Bulk commons and reverse holos sell cheap but in volume, which suits live shows. Start in one lane for three months before adding a second.
Pick where you will sell
eBay suits singles that buyers search by name and set number. Whatnot suits live auctions and pack openings, where the live format drives bids.
Read each platform’s seller fees on its own help pages and put them in your pricing sheet from day one.
Buy stock you can price
Check recent sold prices before you buy, and ignore asking prices. A collection bought at a fair price earns more than a booster box bought at release hype.
Keep every receipt, including car boot and private buys. You will need them for your costs at tax time.
Store and record every card
Sleeve anything worth more than a few pounds and keep it in a toploader. Store singles in labelled card boxes by set, so a sale on eBay turns into a thirty-second pick.
Log each card or lot in an inventory app or spreadsheet with cost, date and box location. The log tells you where each card sits and whether it made money.
Post cards so they arrive flat
Send singles in a penny sleeve and toploader inside a rigid card mailer. A thermal label printer saves time once you post more than a handful a day.
Royal Mail, InPost and DPD cover most UK card postage, with Evri as another option. Check each courier’s size guide for the mailer you use.
Know when HMRC sees a trade
Buying cards to resell at a profit can count as trading. HMRC’s guidance on gov.uk explains the trading allowance, which lets you earn up to £1,000 a year from trading before you need to tell HMRC, and when you must register for Self Assessment.
Platforms such as eBay and Whatnot share some seller data with HMRC under the digital platform reporting rules, so keep tidy records from your first sale.
Checklist
Run through it before each one goes out.
- 1Pick one lane: singles, sealed or bulk
- 2Choose a main platform and note its fees
- 3Check sold prices before every buy
- 4Keep every receipt
- 5Sleeve, toploader and box-label your singles
- 6Log cost and location for each card or lot
- 7Read HMRC’s trading allowance guidance on gov.uk
Setups
Complete kits for one kind of seller, costed and laid out.
Questions
Do I need to register a business to sell Pokémon cards in the UK?
Selling your own old collection is usually not trading. Buying to resell can be. Read HMRC’s guidance on gov.uk about the trading allowance and Self Assessment to see where you stand.
How much money do I need to start a Pokémon card business?
Start with stock you can afford to sit on for months, plus sleeves, toploaders and mailers. The supplies cost far less than the cards.
Is selling Pokémon cards profitable?
Yes, when you buy below recent sold prices and track every cost. Without records, fees and postage eat the margin before you notice.
Should I sell Pokémon cards on eBay or Whatnot?
eBay for searchable singles, Whatnot for live auctions and bulk. Many sellers use both once stock grows.
Do I pay tax on selling Pokémon cards?
If you trade above the £1,000 trading allowance you need to tell HMRC. Check gov.uk for the current rules.
How should I store Pokémon card stock?
Sleeve and toploader valuable singles, keep them in card boxes labelled by set, and record each box location in your inventory.