Crypto Tax Report

A javascript library for creating configurable tax reports. Supports generic transaction types as well as specific protocol support (such as Compound Finance).

Note: This library is currently in alpha and subject to breaking changes. Please install with a pin to a version tag or commit.

Licensing

Licensing is AGPL v3.0 by default but an MIT license is available for purchase. Reach out at [email protected] to purchase a license for commercial use.

Installation

npm install git://github.com/CryptoTaxTools/crypto-tax-report.git#v0.0.4

Example Use

Here is an example of importing and using the library. If you'd like more examples of using the library, please reference the tests.

import createReport from 'crypto-tax-report';

const report = createReport({
  config: {
    local_currency: 'USD',
    price_method: 'BASE',
    cost_basis_method: 'FIFO',
    decimal_places: 2,
    allow_lot_overlap: true,
  },
  transactions: [
    {
      tx_id: '1',
      tx_type: 'DEPOSIT',
      timestamp: '2020-09-09T01:00:00Z',
      deposit_code: 'USD',
      deposit_amount: '99'
    },
    {
      tx_id: '2',
      tx_type: 'TRADE',
      timestamp: '2020-09-10T01:00:00Z',
      side: 'BUY',
      base_code: 'BTC',
      base_amount: '1',
      quote_code: 'USD',
      quote_amount: '100'
    },
    {
      tx_id: '3',
      tx_type: 'TRADE',
      timestamp: '2020-09-11T01:00:00Z',
      side: 'BUY',
      base_code: 'USD',
      base_amount: '200',
      quote_code: 'BTC',
      quote_amount: '1'
    }
  ],
  prices: [
    {
      tx_id: '2',
      timestamp: '2020-09-10T01:00:00Z',
      base_code: 'BTC',
      quote_code: 'USD',
      price: '100'
    },
    {
      tx_id: '3',
      timestamp: '2020-09-11T01:00:00Z',
      base_code: 'BTC',
      quote_code: 'USD',
      price: '200'
    }
  ]
});

// Example report output
{
  "report": {
    "2020": {
      "income": [],
      "long": [],
      "short": [
        {
          "asset": "BTC",
          "proceeds": "200",
          "date_sold": "2020-09-11T01:00:00Z",
          "cost_basis": "100",
          "asset_amount": "1",
          "date_acquired": "2020-09-10T01:00:00Z",
          "tx_id_sale": "3",
          "tx_id_lot": "2",
        }
      ],
      "unmatched": [
        {
          "asset": "USD",
          "proceeds": "1",
          "date_sold": "2020-09-10T01:00:00Z",
          "cost_basis": "0",
          "asset_amount": "1",
          "date_acquired": "2020-09-10T01:00:00Z",
          "tx_id_sale": "2"
        }
      ],
      "lost": [],
      "interest_income": [],
      "assets": {
        "USD": {
          "increase": "299",
          "decrease": "100",
          "holdings": "199"
        },
        "BTC": {
          "increase": "1",
          "decrease": "1",
          "holdings": "0"
        }
      }
    }
  },
  "config": {
    "local_currency": "USD",
    "price_method": "BASE",
    "cost_basis_method": "FIFO",
    "decimal_places": 2,
    "allow_lot_overlap": true,
  }
}

Input Specs

The createReport function accepts a single object as it's first and only parameter. This object has three properties: config, transactions, and prices.

Report Input Property	Required	Data Type
config	Yes	Object
transactions	Yes	Array
prices	Yes	Array

Config

The config object sets the local currency to use for asset prices, the price method, the accounting method, and the number of decimal places to use for report outputs.

Config Property	Default Value	Allowed Value	Required	Data Type
local_currency	'USD'	Any String	No	String
price_method	'BASE'	'BASE', 'QUOTE'	No	String
cost_basis_method	'FIFO'	'FIFO', 'HIFO', 'LIFO'	No	String
decimal_places	2	Any Number	No	Number
allow_lot_overlap	true	true, false	No	Boolean

local_currency: A local currency must be specified in order to determine which price record to use. For example, if your trade is between BTC and LTC, and you specify GBP as your local currency, then the report code will look for price records that include GBP as the quote code.

price_method: The price method determines which code in a transaction to use for determining cost basis. For a trade between BTC and LTC where BTC is the base and LTC is the quote, if the price method is BASE, the tax code will use a BTC price record for determining the cost basis for the resulting tax lot from the trade.

cost_basis_method: Your options for cost basis accounting are FIFO (first-in, first-out), LIFO (last-in, first-out), and HIFO (highest-in, first-out).

decimal_places: The number of decimals places to use for figures in report output.

allow_lot_overlap: If lot overlap is allowed, two transactions with exactly the same timestamp will be able to reference each others tax lot values when calculating sales. For example, instead of creating an unmatched sale, if another transaction increases the asset holdings at the same timestamp, that sale will use the available funds as the matched tax lot.

Transactions

Transactions are an array of objects. At least 1 transaction is required, otherwise an exception is thrown. Please reference types.ts for a full list of transaction types. There are generic types, which apply to any protocol, and there are protocol-specific transaction types, like the ones modeled after Compound Finance activity. Please see fees.md for some notes on fee treatment.

Specific Protocol Transaction Types

• Compound Finance Transaction Docs

Generic Transaction Types

Trade

Property	Data Type	Allowed Value	Required
tx_id	String	Any String	Yes
tx_type	String	'TRADE'	Yes
timestamp	String	ISO 8601 DateTime String	Yes
side	String	BUY, SELL, NONE	Yes
base_code	String	Any String	Yes
base_amount	String	Any String	Yes
quote_code	String	Any String	Yes
quote_amount	String	Any String	Yes
fee_tx_ids	Array	Array of Strings	No

Deposit

Property	Data Type	Allowed Value	Required
tx_id	String	Any String	Yes
tx_type	String	'DEPOSIT'	Yes
timestamp	String	ISO 8601 DateTime String	Yes
deposit_code	String	Any String	Yes
deposit_amount	String	Any String	Yes
fee_tx_ids	Array	Array of Strings	No

Withdrawal

Property	Data Type	Allowed Value	Required
tx_id	String	Any String	Yes
tx_type	String	'WITHDRAWAL'	Yes
timestamp	String	ISO 8601 DateTime String	Yes
withdrawal_code	String	Any String	Yes
withdrawal_amount	String	Any String	Yes
fee_tx_ids	Array	Array of Strings	No

Income

Property	Data Type	Allowed Value	Required
tx_id	String	Any String	Yes
tx_type	String	'INCOME'	Yes
timestamp	String	ISO 8601 DateTime String	Yes
income_code	String	Any String	Yes
income_amount	String	Any String	Yes
fee_tx_ids	Array	Array of Strings	No

Lost

Property	Data Type	Allowed Value	Required
tx_id	String	Any String	Yes
tx_type	String	'LOST'	Yes
timestamp	String	ISO 8601 DateTime String	Yes
lost_code	String	Any String	Yes
lost_amount	String	Any String	Yes
fee_tx_ids	Array	Array of Strings	No

Prices

Prices are required for transactions that use any asset other than the localCurrency. Please reference types.ts for the Price object type definition.

Property	Data Type	Allowed Value	Required
tx_id	String	Any String	Yes
timestamp	String	ISO 8601 DateTime String	Yes
base_code	String	Any String	Yes
quote_code	String	Any String	Yes
price	String	Any String	Yes