Hi,

I am trying to calculate profits/loss in EUR for investing in USD

My bean file looks like this at the moment. At the end I listed the prices; 
here for easy testing with simple numbers:

option "operating_currency" "USD"
option "operating_currency" "EUR"

; Accounts
1970-01-01 open Assets:Brokerage
1970-01-01 open Assets:Cash
1970-01-01 open Income:CapitalGains
1970-01-01 open Expenses:Commissions
2016-09-13 open Assets:Brokerage:AAPL

2022-01-01 * "Buy AAPL"
  Assets:Brokerage:AAPL         100 AAPL {100.00 USD} @ 100.00 USD
  Assets:Cash -10000.00 USD

2022-06-01 * "Sell AAPL"
  Assets:Brokerage:AAPL        -50 AAPL {} @ 200.00 USD
  Assets:Cash              10000.00 USD
  Income:CapitalGains
2022-12-01 * "Sell AAPL"
  Assets:Brokerage:AAPL        -50 AAPL {} @ 200.00 USD
  Assets:Cash              10000.00 USD
  Income:CapitalGains

;; for testing
2022-01-01 price USD 0.8 EUR
2022-06-01 price USD 0.5 EUR
2022-12-01 price USD 0.9 EUR


Running this query with python and pandas:
SELECT
  year(date) AS year, account, convert(sum(position), 'EUR') AS EUR
WHERE
  account ~ '^Income:CapitalGains'
GROUP BY
  year, account
ORDER BY
  year, account


results in:
====================================================================================================
 - USD - original currency
....................................................................................................
   year              account  sum(position) (USD)
0  2022  Income:CapitalGains             -10000.0
====================================================================================================
 - EUR - converted from USD
....................................................................................................
   year              account  eur (EUR)
0  2022  Income:CapitalGains    -9000.0



As you can see, this query takes only the last price exchange info. Though, 
I
would need a calculation, where for each trading day the conversion takes 
place.
So for this example each different price needs to be account for for each
different trading day.

I am sure, I am doing something wrong... but not sure, what, probably the 
query.
Do you have an idea, what I am doing wrong?
Thank you!
Fabian

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