# Transaction modifier adding (unbalanced) tax postings.
# print. Auto-generated postings are inserted below the matched one.
<
= ^income
  (liabilities:tax)  *.33  ; income tax

2016/1/1 paycheck
    income:remuneration     $-100
    income:donations         $-15
    assets:bank

2016/1/1 withdraw
    assets:cash             $20
    assets:bank

$ hledger print -f- --auto
2016/01/01 paycheck
    income:remuneration           $-100
    (liabilities:tax)              $-33    ; income tax
    income:donations               $-15
    (liabilities:tax)               $-5    ; income tax
    assets:bank

2016/01/01 withdraw
    assets:cash             $20
    assets:bank

>=

# register
$ hledger register -f- --auto
2016/01/01 paycheck             income:remuneration          $-100         $-100
                                (liabilities:tax)             $-33         $-133
                                income:donations              $-15         $-148
                                (liabilities:tax)              $-5         $-153
                                assets:bank                   $115          $-38
2016/01/01 withdraw             assets:cash                    $20          $-18
                                assets:bank                   $-20          $-38
>=

# balance
$ hledger balance -f- --auto
                $115  assets
                 $95    bank
                 $20    cash
               $-115  income
                $-15    donations
               $-100    remuneration
                $-38  liabilities:tax
--------------------
                $-38
>=

# Balance assertions see postings generated by transaction modifier rules.
<
= trigger
  (target)   10

2018/1/1
  (trigger)   1
  (target)    1    = 11  ; this assertion would not fail, auto posting will be taken into account

$ hledger register -f- --auto
2018/01/01                      (trigger)                        1             1
                                (target)                        10            11
                                (target)                         1            12
>=

# Transaction modifier adding (balanced virtual) budget envelope postings.
<
= ^expenses:groceries
    [budget:groceries]                           *-1
    [assets:bank:checking]                        *1

2018/10/7 * MARKET
    expenses:groceries:food
    assets:bank:checking                         $-20

$ hledger print -f- --auto
2018/10/07 * MARKET
    expenses:groceries:food
    [budget:groceries]                 $-20
    [assets:bank:checking]              $20
    assets:bank:checking               $-20

>=

# Rules will preserve a transaction price from the original amount.
<
= assets:billable:client1
  assets:receivable:client1       *100
  revenues:client1

2018/1/1
    (assets:billable:client1)         0.50h @ $90

$ hledger -f- print --auto -x
2018/01/01
    (assets:billable:client1)     0.50h @ $90
    assets:receivable:client1    50.00h @ $90
    revenues:client1                   $-4500

>=

# Rules can set a new commodity in the generated amounts.
<
= assets:billable:client1
  assets:receivable:client1       *$100
  revenues:client1

2018/1/1
    (assets:billable:client1)         0.50h

$ hledger -f- print --auto -x
2018/01/01
    (assets:billable:client1)           0.50h
    assets:receivable:client1             $50
    revenues:client1                     $-50

>=

# And/or a new transaction price.
<
= assets:billable:client1
  assets:receivable:client1       *1.00 "Client1 Hours" @ $100.00
  revenues:client1

2018/1/1
    (assets:billable:client1)         0.50h @ $90

$ hledger -f- print --auto -x
2018/01/01
    (assets:billable:client1)                       0.50h @ $90
    assets:receivable:client1    0.50 "Client1 Hours" @ $100.00
    revenues:client1                                    $-50.00

>=

# Balance assignments may not be used with accounts also affected by transaction modifier rules.
<
= ^expenses:foo
    budget:available   *-1
    assets:checking     *1

2018/10/17 * INITIAL
    budget:available   $100
    equity:opening

2018/10/17 * SOME EXPENSE
    expenses:foo                                 $50
    assets:checking

2018/10/17 * ASSERT
    budget:other
    budget:available                              =$0

$ hledger print -f- --auto
>2
hledger: cannot assign amount to account 

    budget:available

because it is also included in transaction modifiers.

>=1