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Recap HomeCrypto Tax Guide (Lite)HMRC Cryptoassets Manual
  • A Technical Guide to Cryptocurrency Tax for UK Individuals
    • What are Cryptoassets?
    • Who are Recap?
  • CRYPTOCURRENCY TAX
    • Do I Need to Pay Tax on my Cryptoassets?
    • Which Taxes Apply?
      • Capital Gains Tax (CGT)
      • Income tax
      • VAT
      • Inheritance tax
      • Stamp Duty
    • How Much Tax Will I Pay?
    • New HMRC DeFi Guidance
      • Overview of HMRC guidance
      • 1️⃣Is the Reward Income or Capital?
      • 2️⃣Is Beneficial Ownership (BO) transferred?
      • 3️⃣Consider the Tax Treatment
        • Staker/Lender/Collateral Provider
          • Income Rewards
            • BO transferred
              • ➡️At Point of Entry
              • ⬅️At Point of Exit
              • 💧On Liquidation
              • 💎On Receipt of Income Reward
              • Example 1A
              • Example 2A
            • BO not transferred
              • ➡️At Point of Entry
              • ⬅️At Point of Exit
              • 💧On Liquidation
              • 💎On Receipt of Income Reward
              • Example 1B
              • Example 2B
          • Capital Rewards
            • BO transferred
              • ➡️At Point of Entry
              • ⬅️At Point of Exit
              • 💧On Liquidation
              • 💎On Receipt of Capital Reward
              • Example 1C
              • Example 2C
            • BO not transferred
              • ➡️At Point of Entry
              • ⬅️At Point of Exit
              • 💧On Liquidation
              • 💎On Receipt of Capital Reward
              • Example 1D
              • Example 2D
        • Borrower
    • Investor or Trader?
      • Badges of Trade Limitations
      • HMRC Approach
      • Court Cases involving Financial Traders
    • Capital Gains Tax
      • Calculating the Capital Gains Position
      • Disposal proceeds
      • Disposals to Connected Parties
      • Allowable costs for CGT
        • Exchange fees
        • Forks - affect on allowable costs
      • Capital Loss Claims
    • Income Tax
      • Financial trading income
      • Miscellaneous Income
      • Employment income
    • Fair Market Valuation
  • TRANSACTION TYPES
    • 💷Selling Crypto for Fiat
    • 🔄Trading Crypto to Crypto
    • 🛍️Purchases using Crypto
    • 🎁Gifts
    • 💍Spouse Transfers
    • 🎗️Gifts to Charity, CASCs & Bodies for a National Purpose
    • 🎈Airdrops
    • 🤝Staking
    • 💸Transfers
    • 🍴Forks
    • ⛏️Mining
    • 👛Employment income
      • UK Employer
      • Overseas employer
      • National Minimum Wage (NMW)
    • 🚨Lost & Stolen Crypto
    • 🎲Gambling
    • 💧Liquidity Pools
      • Example - Liquidity pool
    • ⬆️Token Upgrades/Swaps
    • 🔮Cryptoasset derivatives (CFDs, Futures and Margin Trading)
    • 💼Crypto Loans
    • 🔄REPOS
    • 🪞Reflections Rewards
    • 👥Referral Income
    • 💳Cashback
    • 🎨NFTs (Non Fungible Tokens)
    • 🎮NFTs earned playing games
  • Record Keeping
  • Filing Your Self-Assessment
    • How to Register for Self-Assessment
    • How to Fill In the Tax Return
    • Submitting the Tax Return and Paying the Tax
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  • What is a fork?
  • Soft Forks
  • Hard Forks

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  1. CRYPTOCURRENCY TAX
  2. Capital Gains Tax
  3. Allowable costs for CGT

Forks - affect on allowable costs

How do forks affect allowable costs?

PreviousExchange feesNextCapital Loss Claims

Last updated 3 years ago

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What is a fork?

Some cryptoassets operate by consensus amongst that cryptoasset’s community. When a significant part of the community want to do something different they may create a ‘fork’ in the blockchain. There are two types of forks, a soft fork and a hard fork.

Soft Forks

A soft fork updates the protocol and is intended to be adopted by all. No new tokens, or distributed ledger, are expected to be created and there is no impact on the tax position.

Hard Forks

A hard fork is different and can result in new tokens coming into existence. Before the fork occurs there is a single distributed ledger. Usually, at the point of the hard fork, a second branch (and therefore a new cryptoasset) is created. The distributed ledger for the original and the new cryptoassets have a shared history up to the fork.

If an individual held tokens of the cryptoasset on the original distributed ledger they will, usually, hold an equal number of tokens on both distributed ledgers after the fork.

The value of the new tokens is derived from the original tokens already held by the individual. After the fork, the new tokens will need to go into their own pool. Any allowable costs for pooling of the original tokens are split between the two pools for the:

  • original tokens; and

  • new tokens

If an individual holds their tokens through an exchange, the exchange will make a choice whether to recognise the new tokens created by the fork.

Costs must be split on a just and reasonable basis. HMRC does not prescribe any particular apportionment method. It is standard practice (based on the treatment of shares, because cryptoassets use the same rules) that the cost of the original cryptoasset is apportioned between the old and new tokens, pro-rata in line with the respective market values of each token the day after the hard fork.

The new tokens can only be disposed of if the exchange recognises the new tokens. If the exchange chooses not to recognise the new tokens then the individual may seek to apportion all of the allowable costs to the original tokens (however HMRC may consider if this is just and reasonable in the circumstances). The individual may instead apportion the costs but seek to make a negligible value claim in respect of the new tokens (providing that the conditions for making a negligible value claim have all been satisfied).

HMRC has the power to enquire into an apportionment method that it believes is not just and reasonable. Therefore whichever method an individual chooses to use, they should keep a record of this and be consistent throughout their tax returns.