Fava Portfolio Summary

This is a Fava extension to display a grouped portfolio view in Fava for a set of Beancount accounts.

It can also calculate MWRR (Money-Weighted Rate of Return) or TWRR (Time-Weighted Rate of Return)

The display is similar to the Balance Sheet in Fava, however it allows grouping accounts, and calculating partial balances.

The MWRR (and especially TWRR) calculations can be very slow to calculate. By default, MWRR is enabled, and TWRR is disabled

Configuration

In the beancount file, configure via:

2000-01-01 custom "fava-extension" "portfolio_summary" "{
    'metadata-key': 'portfolio',
    'account-groups': (
        { 'name': 'cash', 'mwr': False },
        'investment',
        'retirement-pretax',
        'retirement-roth'),
    'internal': (
      '.*:PnL',
      'Income:Investments:Dividends',
      'Income:Bank:Interest'),
    'mwr': 'children',
    'twr': False,
    }"

metadata-key: Name of key used to group accounts
account-groups: Either a string or a dictionary with the name key identifying the name of the group
- If specified as a dictionary, the ineternal, mwr and twr keys can be specied on a per-group basis
internal (optional): List of regex patterns denoting ‘internal’ accounts that should be ignored for cash-flow purposes during MWRR/TWRR calculation. More information about selecting internal accounts can be found here
mwr (optional): Enable MWRR calculation for all accounts (can be overridden at the group level). Possible values: (True, False, ‘children’) Defaults to True
twr (optional): Enable TWRR calculation for all accounts (can be overridden at the group level). Possible values: (True, False, ‘children’) Defaults to False

Additionally each top-level account (that is to be displayed) needs to be marked with the appropriate group:

2000-01-01 open Assets:Investments:Fidelity401k:PreTax
  portfolio: "retirement-pretax"

For each top level account, all transactions of the account and any child accounts will be considered (I.e. for the example above, Assets:Investments:Fidelity401k:PreTax and any accouunt matching Assets:Investments:Fidelity401k:PreTax:.* will be summarized)