Ah that makes sense, thanks. I still think it's better to produce the
transactions instead because that way all beancount tooling will work out
of the box.
On Thu, Dec 2, 2021, 13:54 Scott Wallace <swallace...@gmail.com> wrote:
> Thanks for the leads! And just to clarify, my intent with the Fava
> extension wasn't to produce the transactions, but to calculate:
>
> income - expenses - change in prepaid principal
>
> over some period of time -- essentially, this would be an income statement
> with this augmented value.
> On Thursday, December 2, 2021 at 1:10:23 PM UTC-8 b...@bben.us wrote:
>
>> I don't know of a better way. I take the same view that you
>> describe: that the interest portion of the payment should be attributed as
>> an Expense, principal as paying down a Liability, and any escrow taken out
>> for the mortgage company to pay taxes+insurance on your behalf as adding to
>> an Asset account.
>>
>> Some day I was thinking of writing a beancount plugin that does this
>> split automatically based on the standard amortization schedule, but it's
>> low on my list. It would be a pretty easy plugin I think. A fava extension
>> doesn't seem like the right tool for this - I haven't used those but it
>> seems like their role is to give you ways to display data in your ledger,
>> rather than actually mutating the ledger as proposed here. You could even
>> have the plugin automatically insert the transactions using just the plugin
>> configuration.
>>
>> For example, this could be all the user has to input:
>> plugin "your_cool_plugins.mortgage" "{
>> 'transaction_day_of_month' : 1,
>> 'start_date' : '2010-01-01',
>> 'principal_and_interest_amt': 1000 USD,
>> 'interest_rate_pct': 4.25,
>> 'escrow_amt': 200 USD,
>> }"
>>
>> Then the plugin can generate a transaction every month between
>> `start_date` and today().
>>
>> As for plugin examples, there are several great plugin authors in our
>> community. See here
>> <https://github.com/beancount/beancount/tree/master/beancount/plugins>,
>> and here <https://github.com/redstreet/beancount_reds_plugins> (and
>> there are lots more out there).
>>
>> On Thu, Dec 2, 2021 at 12:56 PM Scott Wallace <swall...@gmail.com> wrote:
>>
>>> Hi, I'm new to beancount/fava but very impressed with it so far.
>>>
>>> I've set up a few months of data to see how things work, and one items
>>> I'd like to track is monthly cash available after expenses and mortgage
>>> payments. Since mortgage payments are partially paying down a liability
>>> (and thus, a chunk isn't really an 'expense' per se), it's not really clear
>>> to me the best way to do this.
>>>
>>> I had been thinking that perhaps I should write a fava extension that
>>> calculates this figure, but as I'm writing this it occurs to me that maybe
>>> there's a way to do it by setting the accounts up differently.
>>>
>>> Any thoughts out there for me?
>>> Also, if I do go down the road of a fava extension, I'd like the
>>> extension to be able to use values typed into the time filter. Can anyone
>>> point me to sample code that does this? My quick tour of the fava code
>>> didn't reveal any obvious suspects, but I have yet to really understand how
>>> it all fits together.
>>>
>>> Thanks!
>>> -Scott
>>>
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