hledger: track if BahnCard was worth it

In November 2021 I got offered a 30€ discount on the BahnCard25 from the Deutsche Bahn AG. Some time ago I cancelled my BahnCard because I wasn't using it enough to justify having one. With a 30€ discount I should have no problem getting the remaining 25.7€ of value back.

But I wanted to track this. I am using hledger to track all my expenses and assets.

The ledger statement for the Bahncard looks like this:

2021-11-24 BahnCard 25
Expenses:misc:Bahncard                     €25.7
Assets:Checking Account
(worthIt:Bahncard2022)                     €55.7  ; full price
(worthIt:Bahncard2022)                      €-30  ; discount

And one statement of the travels looks like this:

2022-01-04 Travel S->KA
Expenses:Travel:Deutsche Bahn             €10.65
Assets:Checking Account
(worthIt:Bahncard2022)                    -€3.55

Result of my current balance:

hledger reg ^worthIt:Bahncard2022

Date

Description

Account

Amount

Balance

2021-11-24

BahnCard 25

(worthIt:Bahncard2022)

€55.70

€55.70

(worthIt:Bahncard2022)

€-30.00

€25.70

2022-01-04

Travel S->KA

(worthIt:Bahncard2022)

€-3.55

€22.15

2022-01-04

Travel KA->S

(worthIt:Bahncard2022)

€-3.55

€18.60

2022-01-06

Travel S->KA

(worthIt:Bahncard2022)

€-3.55

€15.05

2022-01-06

Travel KA->S

(worthIt:Bahncard2022)

€-3.55

€11.50


Now I have about 10 months to use my BahnCard25 and save the remaining 11.50€.
That should be possible. :)