> ## Documentation Index
> Fetch the complete documentation index at: https://guides.koinx.com/llms.txt
> Use this file to discover all available pages before exploring further.
# United Kingdom - Complete Tax Report
> See how the UK Complete Tax Report applies HMRC rules to your crypto tax data, including Section 104 pooling, allowances and detailed gains, income and balances.
* Follows HMRC rules including Section 104 pooling for cost basis and the 30-day bed-and-breakfasting rule
* Capital Gains Tax allowance is £3,000 for 2024-25; gains above this are taxed at 10% (basic rate) or 20% (higher rate)
* Includes income events such as staking and airdrops where applicable
* Report is structured for use with Form SA108 (Capital Gains Summary) in Self Assessment
* Share with your accountant or use directly for Self Assessment filing
UK crypto taxes follow HMRC rules, which means Section 104 pooling, the 30-day bed-and-breakfasting rule, and Capital Gains Tax allowances. The KoinX Complete Tax Report for UK users applies these rules automatically, giving you a report ready for your Self Assessment tax return.
***
## What Is in This Report?
| Section | What It Shows |
| ----------------------------------------- | ---------------------------------------------------- |
| HMRC Capital Gains Summary | Total crypto disposals and capital gains |
| Summary of Income from Crypto Derivatives | Profit and loss from futures and options trading |
| Other Income and Expense Summary | Airdrops, rewards, staking, mining income |
| Beginning of Year Balance | Asset holdings at start of tax year |
| End of Year Balance | Asset holdings at end of tax year |
| Capital Gains Transactions | Detailed list of all disposals |
| Crypto Derivatives Transactions | Detailed futures and options trades |
| Other Income & Expense Transactions | Income and expense events |
| Asset Wise Profit & Loss | Profit and loss breakdown by asset |
| Data Sources | Exchanges, wallets, or files used to generate report |
This report compiles all your crypto tax information into one document for Self Assessment filing or sharing with your accountant.
***
## How HMRC Treats Crypto
HMRC treats cryptocurrency as property (similar to stocks). Capital Gains Tax applies when you sell, trade, or spend crypto. Income Tax applies when you receive crypto as income (staking, airdrops, mining). The CGT Allowance is the first £3,000 of gains tax-free (2024-25 onwards; was £6,000 in 2023-24). CGT rates are 10% for basic rate taxpayers and 20% for higher rate taxpayers on gains above the allowance.
***
## HMRC Capital Gains Summary
This section summarises all crypto disposals during the tax year.
| Field | Description |
| ------------------- | -------------------------------------- |
| Number of Disposals | Total number of crypto disposals |
| Disposal Proceeds | Total value received from disposals |
| Allowable Costs | Total purchase cost of disposed assets |
| Gains Before Losses | Gross profit from disposals |
| Losses in the Year | Total losses recorded |
| Net Capital Gains | Final gains after subtracting losses |
The report also includes Self Assessment filing tips, explaining how to report these numbers in Form SA108 (Capital Gains Summary).
***
## Summary of Income from Crypto Derivatives
If you trade crypto derivatives such as futures or options, this section summarises your trading performance.
| Field | Description |
| --------------------- | ------------------------------------------------- |
| Total Realised Profit | Total profit from derivatives trading |
| Total Realised Losses | Total losses from derivatives trading |
| Total Margin Fees | Trading fees paid or received |
| Net Profit and Loss | Final profit after accounting for losses and fees |
This section provides a high-level overview of derivatives trading activity during the tax year.
***
## Other Income and Expense Summary
This section records **crypto received as income**, rather than through trading.
Examples include:
* Airdrops
* Staking rewards
* Mining income
* Salary received in crypto
* Consultancy payments
Income values are calculated based on the **market value of the asset at the time it was received**.
The section also include **expenses**, such as:
* Margin interest
* Mining expenses
* Donations
* Consultancy expenses
* Brokerage fees
***
## Section 104 Pooling Explained
Unlike FIFO, the UK uses pooled cost basis.
All holdings of the same crypto asset are combined into a pool. The pool tracks total quantity and total cost. When you sell, the cost basis is the average cost per unit from the pool.
**Example:** Buy 1 BTC at £20,000, then buy 1 BTC at £30,000. Pool: 2 BTC with £50,000 cost. Average price = £25,000 per BTC. Sell 1 BTC at £35,000. Gain = £10,000.
KoinX automatically applies Section 104 pooling for UK users.
***
## The 30-Day Rule (Bed and Breakfasting)
HMRC prevents loss harvesting through the 30-day rule. If you sell crypto and repurchase the same asset within 30 days, the sale must be matched with the repurchase transaction instead of the pool.
**Example:** Sell 1 BTC at £35,000, then rebuy 1 BTC at £33,000 within 30 days. Gain = £2,000.
KoinX applies this rule automatically when generating the report.
***
## Same-Day Rule
HMRC matching rules follow this order: same-day matching first, then the 30-day rule, then the Section 104 pool. KoinX applies this order automatically during tax calculations.
***
## Detailed Beginning of Year Balance of Assets
Shows the **portfolio position at the start of the financial year**.
## Detailed End of Year Balance of Assets
Shows the **portfolio position on the last day of the financial year**.
**Why these reports matters:**
* Shows your starting position for the year
* Helps verify that cost basis carry-forward is correct
* Useful for audit trail and reconciliation
***
## Capital Gains Transactions
This section lists every taxable disposal of cryptocurrency.
| Field | Description |
| --------------- | ----------------------------------- |
| Date Purchased | When the asset was acquired |
| Date Sold | Disposal date |
| Asset | Cryptocurrency traded |
| Quantity | Amount sold |
| Buy Value | Purchase price |
| Sell Value | Sale price |
| Gains or Losses | Profit or loss from the transaction |
| Exchange | Source of transaction data |
This provides a detailed audit trail for HMRC reporting.
***
## Crypto Derivatives Transactions
If derivatives trading occurred, the report includes a detailed list of these trades.
| Field | Description |
| -------- | ------------------ |
| Date | Trade date |
| Asset | Underlying asset |
| Quantity | Contract size |
| Net Gain | Profit or loss |
| Type | Futures or Options |
These transactions support the derivatives summary earlier in the report.
***
## Other Income & Expense Transactions
This section lists **every income and expense event** recorded during the tax year.
Examples include:
* Staking rewards
* Airdrops
* Mining income
* Salary payments
* Donations
* Funding fees
* Consultancy income
These records provide detailed documentation for **income reporting and expense tracking**.
***
## Asset Wise Profit & Loss
This section summarises profit and loss for each cryptocurrency asset.
| Asset | Gross Profit | Gross Loss | Net Gains |
| ----- | ------------ | ---------- | ----------- |
| LUNA | £0.19 | £0 | £0.19 |
| ETH | £213,940.17 | £58,801.30 | £155,138.86 |
| ZK | £509.66 | £0 | £509.66 |
This helps identify which assets generated the most gains or losses.
***
## CGT Allowance and Rates
For the 2024-25 tax year:
| Your Gains | Tax |
| ----------------------------------- | -------- |
| Up to £3,000 | Tax-free |
| Above £3,000 (basic rate taxpayer) | 10% |
| Above £3,000 (higher rate taxpayer) | 20% |
The report shows your total gains so you can determine how much exceeds the CGT allowance.
***
## Data Sources
The final section lists all integrations used to generate the report, including exchanges, wallets, and custom files. This ensures transparency about where the transaction data came from.
***
## Frequently Asked Questions
The Complete Tax Report (UK) is your main document. It includes HMRC-compliant calculations and summaries for Self Assessment.
If you sell and repurchase the same asset within 30 days, the sale is matched to the repurchase price rather than the Section 104 pool. KoinX automatically applies this rule.
Yes. The report uses Section 104 pooling, applies same-day matching, the 30-day rule, and calculates capital gains according to HMRC guidance.
Yes. Losses can offset gains in the same year or be carried forward to future tax years.
10% for basic rate taxpayers and 20% for higher rate taxpayers, after the £3,000 CGT allowance.