Trading fees accompany all matched trades on CoinJar Exchange. Fees are charged once every 24 hours, rather than immediately after a matched trade is settled.
CoinJar Exchange has its own dedicated fee structure, and is not affected by CoinJar's deposit and transfer fees. VAT does not apply to these fees - more information on VAT treatment of digital currencies.
When fees are charged, an invoice is generated that summarises all trading and applicable fees for the previous day. Invoices can be viewed in your CoinJar Exchange settings. Invoices are generated daily between 02:00 - 02:30 UTC. Invoices relate to trades made and fees incurred between 00:00 - 23:59 UTC.
The balance of CoinJar Exchange accounts can become negative if charges to the account exceed the existing account balance. Trading fees are charged to the account related to the pair you're trading (GBP or BTC).
Once an account balance is negative, all withdrawals from CoinJar Exchange are unable to be completed until the balance is paid back. Trading is still possible, provided the account with negative balance is not used to fund the trade.