{
  "slug": "treasury-par-yield-curve",
  "kind": "treasuryParCurve",
  "title": "Treasury par yield curve, month-end",
  "definition": "The U.S. Treasury daily par yield curve rates (constant maturity Treasury yields) taken at each month-end, by tenor from one month to 30 years, as decimals. These are PAR yields on the semiannual coupon-equivalent basis, not spot rates.",
  "regulation": "None — a market reference series (the base curve for a 'Treasury plus spread' discount rate)",
  "keyFormat": "YYYY-MM",
  "unit": "rate",
  "columns": [
    {
      "key": "0.0833",
      "label": "0.0833 years",
      "unit": "rate"
    },
    {
      "key": "0.125",
      "label": "0.125 years",
      "unit": "rate"
    },
    {
      "key": "0.1667",
      "label": "0.1667 years",
      "unit": "rate"
    },
    {
      "key": "0.25",
      "label": "0.25 years",
      "unit": "rate"
    },
    {
      "key": "0.3333",
      "label": "0.3333 years",
      "unit": "rate"
    },
    {
      "key": "0.5",
      "label": "0.5 years",
      "unit": "rate"
    },
    {
      "key": "1",
      "label": "1 year",
      "unit": "rate"
    },
    {
      "key": "2",
      "label": "2 years",
      "unit": "rate"
    },
    {
      "key": "3",
      "label": "3 years",
      "unit": "rate"
    },
    {
      "key": "5",
      "label": "5 years",
      "unit": "rate"
    },
    {
      "key": "7",
      "label": "7 years",
      "unit": "rate"
    },
    {
      "key": "10",
      "label": "10 years",
      "unit": "rate"
    },
    {
      "key": "20",
      "label": "20 years",
      "unit": "rate"
    },
    {
      "key": "30",
      "label": "30 years",
      "unit": "rate"
    }
  ],
  "cadence": {
    "kind": "monthly",
    "rule": "Published monthly; the source typically lags the calendar by up to 2 months. The latest period held here is 2026-06."
  },
  "source": {
    "name": "U.S. Treasury — Daily Treasury Par Yield Curve Rates",
    "url": "https://home.treasury.gov/resource-center/data-chart-center/interest-rates/TextView?type=daily_treasury_yield_curve",
    "citation": "Treasury Daily Par Yield Curve Rates, the last published business day of each month"
  },
  "attested": {
    "on": "2026-07-08",
    "against": "U.S. Treasury Daily Par Yield Curve Rates — the verbatim published CSV downloads committed under data/source/daily-treasury-par-<year>.csv.",
    "how": "src/__tools_buildTreasury.test.js rebuilds the canonical CSV and the module from those downloads on every suite run; the downloads were last refreshed 2026-07-08."
  },
  "addin": {
    "fn": "aos_TreasuryTable",
    "example": "=aos_TreasuryTable(2026, 6)",
    "note": "The ActuarialOS Excel add-in is free and returns this series with one worksheet function."
  },
  "basis": null,
  "platform": "In the ActuarialOS discount-rate tool this curve is the base for a Treasury-plus-spread rate; the add-in exposes it with an optional parallel spread.",
  "disclaimer": "Values on this page are transcribed from the cited source and checked against it by an automated instrument; the source governs. Confirm any figure against the notice before relying on it in signed work.",
  "contentHash": "f478bed99a555f54a5a23f5e87bcda9262ffb46a33312c400b8fd1efea9f467b",
  "current": {
    "key": "2026-06",
    "values": [
      0.037,
      0.0374,
      0.0377,
      0.0387,
      0.0392,
      0.0401,
      0.0398,
      0.0414,
      0.0415,
      0.0419,
      0.043,
      0.0444,
      0.0493,
      0.0491
    ]
  },
  "rows": [
    {"key":"2024-01","values":[0.0553,null,0.0546,0.0542,0.054,0.0518,0.0473,0.0427,0.0405,0.0391,0.0395,0.0399,0.0434,0.0422]},
    {"key":"2024-02","values":[0.0553,null,0.055,0.0545,0.0543,0.053,0.0501,0.0464,0.0443,0.0426,0.0428,0.0425,0.0451,0.0438]},
    {"key":"2024-03","values":[0.0549,null,0.0548,0.0546,0.0542,0.0538,0.0503,0.0459,0.044,0.0421,0.042,0.042,0.0445,0.0434]},
    {"key":"2024-04","values":[0.0548,null,0.0551,0.0546,0.0545,0.0544,0.0525,0.0504,0.0487,0.0472,0.0471,0.0469,0.049,0.0479]},
    {"key":"2024-05","values":[0.0548,null,0.0548,0.0546,0.0546,0.0542,0.0518,0.0489,0.0469,0.0452,0.0452,0.0451,0.0473,0.0465]},
    {"key":"2024-06","values":[0.0547,null,0.0547,0.0548,0.0545,0.0533,0.0509,0.0471,0.0452,0.0433,0.0433,0.0436,0.0461,0.0451]},
    {"key":"2024-07","values":[0.0549,null,0.0551,0.0541,0.0532,0.0514,0.0473,0.0429,0.041,0.0397,0.04,0.0409,0.0444,0.0435]},
    {"key":"2024-08","values":[0.0541,null,0.0532,0.0521,0.0512,0.0489,0.0438,0.0391,0.0379,0.0371,0.038,0.0391,0.0428,0.042]},
    {"key":"2024-09","values":[0.0493,null,0.0487,0.0473,0.0465,0.0438,0.0398,0.0366,0.0358,0.0358,0.0367,0.0381,0.0419,0.0414]},
    {"key":"2024-10","values":[0.0476,null,0.0476,0.0464,0.0456,0.0443,0.0427,0.0416,0.0412,0.0415,0.0421,0.0428,0.0458,0.0447]},
    {"key":"2024-11","values":[0.0476,null,0.0469,0.0458,0.0452,0.0442,0.043,0.0413,0.041,0.0405,0.041,0.0418,0.0445,0.0436]},
    {"key":"2024-12","values":[0.044,null,0.0439,0.0437,0.0432,0.0424,0.0416,0.0425,0.0427,0.0438,0.0448,0.0458,0.0486,0.0478]},
    {"key":"2025-01","values":[0.0437,null,0.0437,0.0431,0.0433,0.0428,0.0417,0.0422,0.0427,0.0436,0.0447,0.0458,0.0488,0.0483]},
    {"key":"2025-02","values":[0.0438,0.0437,0.0438,0.0432,0.0432,0.0425,0.0408,0.0399,0.0399,0.0403,0.0414,0.0424,0.0455,0.0451]},
    {"key":"2025-03","values":[0.0438,0.0436,0.0435,0.0432,0.0431,0.0423,0.0403,0.0389,0.0389,0.0396,0.0409,0.0423,0.0462,0.0459]},
    {"key":"2025-04","values":[0.0435,0.0437,0.0436,0.0431,0.0437,0.0419,0.0385,0.036,0.0358,0.0372,0.0393,0.0417,0.0468,0.0466]},
    {"key":"2025-05","values":[0.0433,0.0435,0.0435,0.0436,0.0439,0.0436,0.0411,0.0389,0.0387,0.0396,0.0418,0.0441,0.0493,0.0492]},
    {"key":"2025-06","values":[0.0428,0.0441,0.0445,0.0441,0.0436,0.0429,0.0396,0.0372,0.0368,0.0379,0.0398,0.0424,0.0479,0.0478]},
    {"key":"2025-07","values":[0.0449,0.0447,0.0446,0.0441,0.044,0.0431,0.041,0.0394,0.0389,0.0396,0.0414,0.0437,0.0489,0.0489]},
    {"key":"2025-08","values":[0.0441,0.0434,0.043,0.0423,0.0417,0.0401,0.0383,0.0359,0.0358,0.0368,0.0392,0.0423,0.0486,0.0492]},
    {"key":"2025-09","values":[0.042,0.0419,0.0415,0.0402,0.0398,0.0383,0.0368,0.036,0.0361,0.0374,0.0393,0.0416,0.0471,0.0473]},
    {"key":"2025-10","values":[0.0406,0.0402,0.0404,0.0389,0.0387,0.0379,0.037,0.036,0.036,0.0371,0.0389,0.0411,0.0465,0.0467]},
    {"key":"2025-11","values":[0.0405,0.0397,0.0399,0.0388,0.0386,0.0374,0.0361,0.0347,0.0349,0.0359,0.0378,0.0402,0.0462,0.0467]},
    {"key":"2025-12","values":[0.0374,0.0375,0.0367,0.0367,0.0363,0.0359,0.0348,0.0347,0.0355,0.0373,0.0394,0.0418,0.0479,0.0484]},
    {"key":"2026-01","values":[0.0372,0.0373,0.0375,0.0367,0.0369,0.0361,0.0348,0.0352,0.036,0.0379,0.0401,0.0426,0.0482,0.0487]},
    {"key":"2026-02","values":[0.0374,0.0373,0.0373,0.0367,0.0367,0.036,0.0348,0.0338,0.0339,0.0351,0.0372,0.0397,0.0457,0.0464]},
    {"key":"2026-03","values":[0.0374,0.0373,0.0372,0.037,0.037,0.0372,0.0368,0.0379,0.0381,0.0392,0.0411,0.043,0.0488,0.0488]},
    {"key":"2026-04","values":[0.0372,0.0371,0.0371,0.0368,0.0376,0.0371,0.0372,0.0388,0.0391,0.0402,0.042,0.044,0.0497,0.0498]},
    {"key":"2026-05","values":[0.0372,0.0371,0.0371,0.0369,0.0378,0.0378,0.0379,0.0398,0.0406,0.0413,0.0427,0.0445,0.0498,0.0499]},
    {"key":"2026-06","values":[0.037,0.0374,0.0377,0.0387,0.0392,0.0401,0.0398,0.0414,0.0415,0.0419,0.043,0.0444,0.0493,0.0491]}
  ]
}