double-entry transaction can carry the same tag or a different tag.  For

example, in this entry:

    2012-05-03 Sir Moneybags

            ;Entity: Sir-Moneybags

            ;Invoice: accounts/documentation/org/invoices/2012-05-30_moneybags-invoice_as-sent.txt

        Accrued:Accounts Receivable:Conservancy  $100,000.00

        Income:Main Org:Donations               $-100,000.00

            ;IncomeType: Donations

The portion of the transaction that credits the `Income:Main Org:Donations`

has three tags: [`Entity`](#entity-tag), [`Invoice`](#invoice-tag) and

listed at the top of the transaction, propagate through and apply to both

sides.  But, the `IncomeType` tag, which has no meaning for `Accrued:`

accounts, is applied only to the `Income:Main Org:Donations` part of

the transaction.

Below you'll find detailed descriptions of all the possible tags that are

used in this system.  The actual declarations and enforcement of rules of

these tags can be found in the file `accounts/config/config-tags.ledger` in

this project.

### Documentation Tags

familiar with how to handle those items on the Form 990.  It would be a

relatively simple change to `config-tags.ledger`, though, to support other

income types, or to change it entirely to handle use-cases other than USA

Form 990 filing.

#### TaxImplication Tag

The `TaxImplication` tag is used for all `Asset:` accounts when the

transaction includes a payment of $10.00 or more leaving the account.  This

tag catalogs any tax implications that might occur on outgoing funds.

The most important USA-related issue tracked by this tag are contractors who

go along with a TaxImplication tag.

The possible values for this field are:

* `1099`, indicating the amount paid requires issuance of a USA Federal Form

  1099 for the `Entity` involved.

* `W2`, indicating the amount paid will be part of a USA Federal income, as

  reported on Form W2 report for the `Entity` involved.

* `Retirement-Pretax`, indicating the amount paid was made to a W2 employee

  as part of pre-tax retirement plan, such as a 401(k) or 403(b) plan.