I am working with KMM for several year for my private accounting.
Now I need to track the mileage for a profit & loss report for the tax office.
I have two questions how to handle this with KMM.

1. Currently I use a speadsheet to track the mileage, date, route and cause of travel and calculate my loss via a mileage allowance.
My idea is to use a foreign currency account in KMM with the mileage allowance as the exchange rate.
Which type of account I should use? The mileage shall not appear in my financial balance.
There are no "expense accounts"! Can I input directly into a category (no-balance account)?

This leads directly to the second question.
2. How to handle the financial transaction?
I use a category "travel expenses" for reporting to tax office.
But I do not have a account and ledger where I can input the transaction.
I saw a proposal to input this as a car expense. But since I am non-business and do not use a account or deduction of car expenses.
Is it possible to have a transaction from a category to another category without influencing the balance of accounts?
Or do I need 'dummy' accounts for transfer?

Some proposals would be appreciated

No proposals yet?

So as a preliminary solution I

1. stayed with my spreadsheet

2. used the 'deferred income and accrued expenses' account with two transactions 'travel expense' on 31.12 and 'tax refund' on 01.01 to correct the balance.

Any other ideas are welcome.