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Good way to record currency conversion transactions in personal accounting software?
I found an answer by Peter Selinger, in two articles, Tutorial on multiple currency accounting (June 2005, Jan 2011) and the accompanying Multiple currency accounting in GnuCash (June 2005, Feb 2007). Selinger embraces the currency neutrality I'm after. His method uses "[a]n account that is denominated as a difference of multiple currencies... known as a currency trading account." Currency trading accounts show the gain or loss based on exchange rates at any moment.  Apparently GnuCash 2.3.9 added support for multi-currency accounting. I haven't tried this myself. This feature is not enabled by default, and must be turned on explicity. To do so, check "Use Trading Accounts" under File -> Properties -> Accounts. This must be done on a per-file basis. Thanks to Mike Alexander, who implemented this feature in 2007, and worked for over 3 years to convince the GnuCash developers to include it. Older versions of GnuCash, such as 1.8.11, apparently had a feature called "Currency Trading Accounts", but they behaved differently than Selinger's method.