Hi,
That looks very interesting. I'm doing something similar right now.
Two things that I found necessary/helpful:
* I have one interest account and I just tie it to the security by
adding an empty posting.
e.g.
2015-01-22 * "Dividend"
Assets:Investment:CHCORP 0 CHCORP
Assets:Liquidity:CHF 20.00 CHF
Income:Patrick:Interest -20.00 CHF
That way I can tie all the flows together for CHCORP
* Another thing is to make sure to prevent transactions between
different investments in the same transaction as this confuses my logic,
so I'm preventing this by
import collections
from beancount.core import getters
from beancount.core import data
__plugins__ = ['check']
MixedInvestAssets = collections.namedtuple('MixedInvestAssets', 'source
message entry')
def check(entries, options_map):
errors = []
commodity_map = getters.get_commodity_map(entries, create_missing=True)
commodity_type_map = getters.get_values_meta(commodity_map, 'type')
for entry in data.filter_txns(entries):
ccys = set()
for posting in entry.postings:
ccy = posting.units.currency
if commodity_type_map[ccy] == 'invest':
ccys.add(ccy)
if len(ccys) > 1:
errors.append(MixedInvestAssets(
entry.meta,
"Transaction with two or more different investment
postings",
entry
))
return entries, errors
Regards,
Patrick
On 19-Jan-19 05:22, Justus Pendleton wrote:
Here's my take at a script that will calculate the money-weighted
return for a portfolio (i.e. the XIRR function in spreadsheets).
https://github.com/hoostus/portfolio-returns
All it does it output a single number -- the rate of return. The only
real work this script does is crawl through beancount files and figure
out what cashflows in & out of the account there were over the
specified time period. Then it feeds those cashflows into an IRR
calculation.
Here's the return over the past 1 year.
> python irr.py --account Assets:US:Vanguard:Roth --1year
/Volumes/my_docs/beancount/my.beancount --internal
Income:TaxFree:Dividends
0.72%
(Apparently not a fantastic year for my Roth IRA!)
Here's the return year-to-date.
> python irr.py --account Assets:US:Vanguard:Roth --ytd
/Volumes/my_docs/beancount/my.beancount --internal
Income:TaxFree:Dividends
115.86%
(All numbers are annualised, so even a tiny increase after 19 days
results in a huge annual rate of return.)
It seems to work the way I expect on my own beancount file and a few
other small test cases I put together. Feel free to email me or post
here if you have problems, suggestions, etc.
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