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How do I do double-entry bookkeeping for separately-managed investment accounts?
For any accounts where you have a wish to keep track of dividends, gains and losses, etc., you will have to set up a an account to hold the separately listed securities.  It looks like you already know how to do this.  Here the trading accounts will help you, especially if you have Finance:Quote set up (to pull security prices from the internet). For the actively-managed accounts, you can just create each managed account and NOT fill it with the separate securities.  You can record the changes in that account in summary each month/year as you prefer. So, you might set up your chart of accounts to include these assets: And this income: The actively-managed accounts will each get set up as Type "Stock."  You will create one fake security for each account, which will get your unrealized gains/losses on active accounts showing up in your trading accounts.  The fake securities will NOT be pulling prices from the internet.  Go to     Tools -> Securities Editor -> Add and type in a name such as "Merrill Lynch Brokerage," a symbol such as "ML1," and in the "Type" field input something like "Actively Managed." In your self-managed accounts, you will record dividends and sales as they occur, and your securities will be set to get quotes online.  You can follow the general GnuCash guides for this.   In your too-many-transactions actively traded accounts, maybe once a month you will gather up your statements and enter the activity in summary to tie the changes in cost basis.  I would suggest making each fake "share" equal $1, so if you have a $505 dividend, you buy 505 "shares" with it.  So, you might have these transactions for your brokerage account with Merrill Lynch (for example): When you have finished making your period-end summary entries for all the actively-managed accounts, double-check that the share balances of your actively-managed accounts match the cost basis amounts on your statements.  Remember that each fake "share" is worth $1 when you enter it.  Once the cost basis is tied, you can go into the price editor (Tools -> Price Editor) and enter a new "price" as of the period-end date for each actively-managed account.  The price will be "Value of Active Acct at Period-End/Cost of Active Acct at Period-End."  So, if your account was worth $1908 but had a cost basis of $505 on Jan. 31, you would type "1908/505" in the price field and Jan. 31, 2017 in the date field. When you run your reports, you will want to choose the price source as "Nearest in Time" so that GnuCash grabs the correct quotes. This should make your actively-managed accounts have the correct activity in summary in your GnuCash income accounts and let them work well with the Trading Accounts feature.