Tax parameter setting value

Each object in a tax parameter detail's settings list represents one recorded value for that parameter: what changed. The list holds every recorded value that has not been deleted, newest effective_start first and, within one effective_start, newest created_at first. The top-level value and effective_start on the tax parameter detail are the value in force on as_of: what applies when.

A tax parameter written more than once with the same effective_start lists every write. The entry with the latest created_at for an effective_start is the value in force from that date, and each earlier entry for that date was replaced at the created_at of the entry listed above it. Deleted values are not listed. A form submission deletes a tax parameter's earlier values, so a tax parameter last set through a form lists one entry.

{
  "value": "M",
  "effective_start": "2021-03-15",
  "created_at": "2021-03-16T10:41:27.385220Z",
  "actor": {
    "party": "employee"
  }
}

Attribute	Description
`value` string	(Optional) The value of the setting.
`effective_start` YYYY-MM-DD	(Optional) Date when this value starts being effective. Will be set to null if the tax parameter cannot be effective dated.
`created_at` datetime	ISO 8601 UTC timestamp when Check recorded this value. For one `effective_start`, the entry with the latest `created_at` is the value in force from that date.
`actor` object	(Optional) Who wrote this value. `null` when attribution cannot be recovered. See Tax parameter setting actor.

In this settings list, the employee changed the value effective 2021-03-15 from S to M. M is in force from 2021-03-15, and S is in force from 2020-01-01 until then.

[
  {
    "value": "M",
    "effective_start": "2021-03-15",
    "created_at": "2021-03-16T10:41:27.385220Z",
    "actor": {
      "party": "employee"
    }
  },
  {
    "value": "S",
    "effective_start": "2021-03-15",
    "created_at": "2021-03-12T17:08:54.672901Z",
    "actor": {
      "party": "employee"
    }
  },
  {
    "value": "S",
    "effective_start": "2020-01-01",
    "created_at": "2019-12-18T21:30:06.017734Z",
    "actor": {
      "party": "company"
    }
  }
]