[GNC-dev] Question about fin.scm and mortgage repayment calculations

[Jean Laroche]

Hi Devs,

I've switched to using gnucash from Quicken, and so far I'm very happy.
One thing that's not optimal with Gnucash is how mortgage payments are 
handled as scheduled transactions.
 From what I see, you can do one of two things:
1) Use the action/Scheduled transactions/Mortgage and Loan repayment: 
this in the end will automatically enter a series of scheduled 
transactions to accurately split your monthly payment between principal 
and interest. That's great, except if you do additional payments (as I do)
2) Use the action/Scheduled transactions/Editor and enter a scheduled 
transaction using a formula as provided in fin.scm (which you can edit, 
if you need to add your own formula). This is also great as I could use 
that to compute the right amount based on how much I overpay each month. 
But what if I don't make any additional payment a given month.

The simplest way to achieve what I'm trying to do would be to use 2) and 
compute the interests *based on the current principal*. This would be 
possible if the functions in fin.scm were able to have access to account 
balances (so the interest could be computed accurately)
 From the examples, I don't see that that's possible, but perhaps you 
guys know of a way?

Is this a feature people would be interested in? Or is it too narrow in 
scope?
Jean