I'm reaching out for some advice on a few challenges I'm facing with
Beancount. To give some context, I don't have any formal accounting
education—everything I know is self-taught. I suspect many of my issues
stem from that, but I'm eager to learn and improve.

This is the first time I'm tracking my finances seriously, with specific
financial objectives in mind. I was previously using GNUCash, but I
found the UX for budgets and reporting suboptimal for my needs. I really
like the Fava UI in comparison—it's much more intuitive. Here are the
main areas where I'm seeking help:

- Automate recurring transactions (with reconciliation) and forecasting

  This is the feature I'm missing most from GNUCash.

  In GNUCash, I could set up recurring transactions using a mortgage
  formula that automatically calculated principal + interest. When you
  opened GNUCash, if a recurring transaction was due, you had the chance
  to review and apply it. That way, if something like a phone bill was
  higher than expected for some reason, you could modify it before
  posting.

  My main reason for tracking finances is to forecast: knowing how much
  money I'll have at certain points, when I'll reach X amount, or if
  there's a month where I need to keep extra in my regular account for
  annual payments. How can I achieve something similar in Beancount? Are
  there plugins, scripts, or best practices for automating recurring
  entries and generating forecasts?

  I have tried some of them but I feel they where too complicated or too
  simple this is, they just don't have any mechanisim for reconcile
  (beancount_periodic.recur/amortize) or the mechanism/setup is too
  involved (beanahead).

- Buy milk from farmer.

  rigth now I do transactions like:

  ,----
  | 2025-01-01 event "Milk price" "0.6 EUR"
  | 2025-01-01 price Milk 0.6 EUR
  | 
  | 2025-02-27 txn "Milk"
  |   Expenses:Groceries    6 MILK
  |   Liabilities:Milk
  | 
  | 2025-03-03 txn "Pay Milk January/February"
  |   Assets:Cash    -50.00 EUR
  |   Liabilities:Milk
  `----

  But this results in Fava reporting a liability of something like -300 MILK 
and 170 EUR, which isn't ideal. Of course, I don't want to track my daily milk 
consumption in detail. I set a price for MILK because I don't want to manually 
add the @ price every time, like this:

  ,----
  | 2025-02-27 txn "Milk"
  |   Expenses:Groceries    6 MILK @ 0.6 EUR
  |   Liabilities:Milk
  `----

  So, how can I fix this while still keeping track of how much I owe without 
cluttering reports with commodity quantities I don't care about?

- Keep track of fuel consumpution AND KM/EUR

  Similar to the Milk issue but more involved. I have a car that can use
  LPG or Gasoline (95 or 98). Rigth now I do:

  ,----
  | 2025-07-27 balance Equity:Hacks:Expenses:Coche:Kilometraje  154043.6 KM
  | 
  | 2025-07-27 * "Fuel"
  |   time: "06:06:39"
  |   Expenses:Car:Fuel                 15.91 LPG @@ 15.58 EUR
  |   Expenses:Car:Fuel                 12.43 G95 @@ 20.00 EUR
  |   Equity:Hacks:Car:Fuel
  |   Assets:Cash  EUR
  | 
  | 2025-07-27 * "LPG: Marino"
  |   Expenses:Car:Fuel              25.32 LPG @@ 24.03 EUR
  |   Equity:Hacks:Expenses:Car:Mileage               255 KM @@ 25.32 LPG
  |   Equity:Hacks:Car:Fuel
  |   Assets:Cash  EUR
  `----

  This feels too cumbersome, and I'm adding stuff to Equity that probably 
shouldn't be there. I want to track mileage, add maintenance events for the 
car, and calculate costs like EUR per KM so I can budget for long trips. What's 
a cleaner way to handle this in Beancount without hacks?

- Net Profit Liabilities and Expenses

  I have a mortgage on my main house (it's my only one and not an investment).

As far as I can tell, net profit is calculated without accounting for principal 
payments on the mortgage because those are treated as Liabilities, not 
Expenses. This doesn't make much sense for personal finance tracking. How can I 
adjust this? Or, alternatively, how can I calculate what money I really have 
available (Income - Expenses - Payments on Liabilities)?

Thank you in advance for any insights, examples, or resources you can share. 
I'm happy to provide more details if needed.

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