hledger-interest: computes interest for a given account

hledger-interest is a small command-line utility based on Simon Michael's hleder library. Its purpose is to compute interest for a given ledger account. Using command line flags, the program can be configured to use various schemes for day-counting, such as act/act, 30360, 30E360, and 30/360isda. Furthermore, it supports a (small) number of interest schemes, i.e. annual interest with a fixed rate and the scheme mandated by the German BGB288 (Basiszins für Verbrauchergeschäfte). Extending support for other schemes is fairly easy, but currently requires changing to the source code. As an example, consider the following loan, stored in a file called test.ledger: > 20080926 Loan > Assets:Bank EUR 10000.00 > Liabilities:Loan > > 20081127 Payment > Assets:Bank EUR -3771.12 > Liabilities:Loan > > 20090503 Payment > Assets:Bank EUR -1200.00 > Liabilities:Loan > > 20101210 Payment > Assets:Bank EUR -3700.00 > Liabilities:Loan Suppose that loan earns 5% interest per year, and payments amortize interest before amortizing the principal claim, then the resulting ledger would look like this: > $ hledger-interest --file=test.ledger --source=Expenses:Interest --target=Liabilities:Loan --30-360 --annual=0.05 Liabilities:Loan > 20080926 Loan > Assets:Bank EUR 10000.00 > Liabilities:Loan > > 20081127 Payment > Assets:Bank EUR -3771.12 > Liabilities:Loan > > 20081127 5.00% interest for EUR -10000.00 over 61 days > Liabilities:Loan EUR -84.72 > Expenses:Interest > > 20081231 5.00% interest for EUR -6313.60 over 34 days > Liabilities:Loan EUR -29.81 > Expenses:Interest > > 20090503 Payment > Assets:Bank EUR -1200.00 > Liabilities:Loan > > 20090503 5.00% interest for EUR -6343.42 over 123 days > Liabilities:Loan EUR -108.37 > Expenses:Interest > > 20091231 5.00% interest for EUR -5251.78 over 238 days > Liabilities:Loan EUR -173.60 > Expenses:Interest > > 20101210 Payment > Assets:Bank EUR -3700.00 > Liabilities:Loan > > 20101210 5.00% interest for EUR -5425.38 over 340 days > Liabilities:Loan EUR -256.20 > Expenses:Interest > > 20101231 5.00% interest for EUR -1981.58 over 21 days > Liabilities:Loan EUR -5.78 > Expenses:Interest Running the utility with --help gives a brief overview over the available options: > Usage: hledger-interest [OPTION...] ACCOUNT > -h --help print this message and exit > -V --version show version number and exit > -v --verbose echo input ledger to stdout (default) > -q --quiet don't echo input ledger to stdout > --today update account until today > -f FILE --file=FILE input ledger file > -s ACCOUNT --source=ACCOUNT interest source account > -t ACCOUNT --target=ACCOUNT interest target account > --act use act day counting convention > --30-360 use '30/360' day counting convention > --30E-360 use '30E/360' day counting convention > --30E-360isda use '30E/360isda' day counting convention > --constant=RATE constant interest rate > --annual=RATE annual interest rate > --bgb288 compute interest according to German BGB288

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• PeterSimons

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