U.S. Interest Expense on the Public Debt (Monthly and Fiscal Year to Date)

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  "required": [
    "limit"
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  "properties": {
    "page": {
      "type": "integer",
      "default": 1,
      "maximum": 10000,
      "minimum": 1,
      "description": "Which page of `limit` rows to return, starting at 1. A page past the last one is an error; meta.total-pages says how many there are."
    },
    "limit": {
      "type": "integer",
      "maximum": 1000,
      "minimum": 1,
      "description": "How many rows to return, newest month first, 1 to 1000. The latest month has 38 rows, so 38 returns one month's full table."
    },
    "filter": {
      "type": "string",
      "default": "",
      "maxLength": 500,
      "description": "Optional Fiscal Data filter: field:operator:value terms separated by commas, all of which must hold. Fields: record_date (the month end, YYYY-MM-DD), expense_catg_desc (for example INTEREST EXPENSE ON PUBLIC ISSUES), expense_group_desc (ACCRUED INTEREST EXPENSE, AMORTIZED DISCOUNT or AMORTIZED PREMIUM), expense_type_desc (for example Treasury Notes, Treasury Bonds, Treasury Bills, Inflation Protected Securities (TIPS)), month_expense_amt and fytd_expense_amt. Operators: eq, lt, lte, gt, gte, in (a parenthesised list). Values may contain spaces and parentheses. Examples: expense_type_desc:eq:Treasury Notes and record_date:eq:2026-09-30,expense_group_desc:eq:ACCRUED INTEREST EXPENSE. Leave empty for no filter. A value that matches nothing returns an empty list; an unknown field or operator is a validation error."
    }
  },
  "additionalProperties": false
}

{
  "type": "object",
  "required": [
    "data",
    "meta"
  ],
  "properties": {
    "data": {
      "type": "array",
      "items": {
        "type": "object",
        "required": [
          "record_date",
          "expense_catg_desc",
          "expense_group_desc",
          "expense_type_desc",
          "month_expense_amt",
          "fytd_expense_amt",
          "src_line_nbr"
        ],
        "properties": {
          "record_date": {
            "type": "string",
            "description": "The month end the figures are for, YYYY-MM-DD."
          },
          "src_line_nbr": {
            "type": "string",
            "description": "The row's position in the Treasury's own table for that month, as a string."
          },
          "fytd_expense_amt": {
            "type": "string",
            "description": "The same figure accumulated since the start of the federal fiscal year (1 October), in whole dollars as a decimal string. Can be negative."
          },
          "expense_catg_desc": {
            "type": "string",
            "description": "The broad category, for example INTEREST EXPENSE ON PUBLIC ISSUES or the government account series."
          },
          "expense_type_desc": {
            "type": "string",
            "description": "The security type, for example Treasury Notes, Treasury Bonds or Inflation Protected Securities (TIPS)."
          },
          "month_expense_amt": {
            "type": "string",
            "description": "The month's interest expense in whole dollars, as a decimal string; 43512954841.94 is about 43.5 billion dollars. Can be negative."
          },
          "expense_group_desc": {
            "type": "string",
            "description": "ACCRUED INTEREST EXPENSE, AMORTIZED DISCOUNT or AMORTIZED PREMIUM. Amortized premium reduces the cost, so those rows are negative."
          }
        },
        "additionalProperties": true
      },
      "description": "One row per expense category, group and security type per month. Empty when nothing matches."
    },
    "meta": {
      "type": "object",
      "required": [
        "count",
        "total-count",
        "total-pages"
      ],
      "properties": {
        "count": {
          "type": "integer",
          "description": "How many rows this page holds."
        },
        "labels": {
          "type": "object",
          "description": "Human-readable name of each column."
        },
        "dataTypes": {
          "type": "object",
          "description": "The Treasury's type name for each column."
        },
        "dataFormats": {
          "type": "object",
          "description": "The Treasury's display format for each column; the amount columns report $10.20, meaning whole dollars."
        },
        "total-count": {
          "type": "integer",
          "description": "How many rows match the filter in all, across every page."
        },
        "total-pages": {
          "type": "integer",
          "description": "How many pages of `limit` rows the whole match makes."
        }
      },
      "additionalProperties": true
    },
    "links": {
      "type": "object",
      "description": "Treasury's own self, first, prev, next and last page links."
    }
  },
  "description": "The Treasury's response: the interest expense rows, newest month first, and a meta block with the match count.",
  "additionalProperties": true
}