computes the internal rate of return of an investment
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hledger-irr is a small command-line utility based on Simon Michael's hledger library. Its purpose is to compute the internal rate of return, also known as the effective interest rate, of a given investment. After specifying what account holds the investment, and what account stores the gains (or losses, or fees, or cost), it calculates the hypothetical annualy rate of fixed rate investment that would have provided the exact same cash flow.
As an example, consider the following irregular investment recorded in a file
speculation.ledger. The account “Speculation” holds the investment which
could be, for example, a stock. Regularly, we make sure that the value of the
account matches the value of the stock, by moving money from or to the account
“Rate Gain”. It does not really matter when we adjust the price, as long as it
is correct at the end of our reporting period.
2011-01-01 Some wild speculation – I wonder if it pays off Speculation €100.00 Cash 2011-02-01 More speculation (and adjustment of value) Cash -€10.00 Rate Gain -€1.00 Speculation 2011-03-01 Lets pull out some money (and adjustment of value) Cash €30.00 Rate Gain -€3.00 Speculation 2011-04-01 More speculation (and it lost some money!) Cash -€50.00 Rate Gain € 5.00 Speculation 2011-05-01 Getting some money out (and adjustment of value) Speculation -€44.00 Rate Gain -€ 3.00 Cash 2011-06-01 Emptying the account (after adjusting the value) Speculation -€85.00 Cash €90.00 Rate Gain -€ 5.00
We can now calculate the rate of return for the whole time or just for parts of it (and be freaked out by the volatility of the investment):
$ hledger-irr -f speculation.ledger -t "Rate Gain" -i Speculation -c 2011/01/01: €-100.00 2011/02/01: €-10.00 2011/03/01: €30.00 2011/04/01: €-50.00 2011/05/01: €47.00 2011/06/01: €90.00 2011/01/01 - 2017/07/01: -100.00% $ hledger-irr -f speculation.ledger -t "Rate Gain" -i Speculation -e 2011-03-01 2011/01/01 - 2011/03/01: 26.12% $ hledger-irr -f speculation.ledger -t "Rate Gain" -i Speculation -b 2011-03-01 2011/03/01 - 2017/07/01: -100.00% $ hledger-irr -f speculation.ledger -t "Rate Gain" -i Speculation --monthly 2011/01/01 - 2011/02/01: 12.49% 2011/02/01 - 2011/03/01: 41.55% 2011/03/01 - 2011/04/01: -51.44% 2011/04/01 - 2011/05/01: 32.24% 2011/05/01 - 2011/06/01: 95.92%
Running the utility with
--help gives a brief overview over the
$ hledger-irr --help Usage: hledger-irr [OPTION...] -h --help print this message and exit -V --version show version number and exit -c --cashflow also show all revant transactions -f FILE --file=FILE input ledger file (pass '-' for stdin) -i ACCOUNT --investment-account=ACCOUNT investment account -t ACCOUNT --interest-account=ACCOUNT interest/gain/fees/losses account -b DATE --begin=DATE calculate interest from this date -e DATE --end=DATE calculate interest until this date -D --daily calculate interest for each day -W --weekly calculate interest for each week -M --monthly calculate interest for each month -Y --yearly calculate interest for each year
Known bugs and issues:
Currenlty, hledger-irr does not cope well with multiple commodities (e.g. Euro and Dollar, or shares).
Also, interest or fees that do not pass through the account selected by
--investment-accountare not taken into consideration.