{
  "$comment": "Machine-readable companion to https://valem.run/calculators/denmark/holiday-entitlement. Formula, inputs, outputs, engine-verified test vectors, cited sources and the re-runnable Valem ModelSpec behind the page.",
  "url": "https://valem.run/calculators/denmark/holiday-entitlement",
  "dataUrl": "https://valem.run/calculators/denmark/holiday-entitlement.json",
  "license": {
    "name": "CC BY 4.0",
    "url": "https://creativecommons.org/licenses/by/4.0/",
    "attribution": "Denmark ferie model by Valem (https://valem.run/calculators/denmark/holiday-entitlement), CC BY 4.0.",
    "note": "Covers the model — the expression of each rule and the arrangement of the catalog. The rates and thresholds themselves are law and are not licensed by anyone; the cited sources are where they come from."
  },
  "verificationUrl": "https://valem.run/calculators/denmark/holiday-entitlement/verify",
  "country": "denmark",
  "countryName": "Denmark",
  "formula": "holiday-entitlement",
  "formulaName": "Ferie",
  "title": "Feriedage 2026 — 2,08 Dage Per Måned, 25 Om Året",
  "answer": "borger.dk states that you earn 2,08 paid holiday days for each month you are employed, which amounts to 25 feriedage — five weeks — for a full year. The accrual is the same whether you work full time, part time or only a few days a week.",
  "lang": "en",
  "currency": "DKK",
  "taxYear": "2026",
  "verification": {
    "claim": "internal-consistency",
    "statement": "The Valem engine reproduces this model's stated formula through 7 self-test cases (below, and re-runnable against the spec). That asserts internal consistency, NOT that the formula matches current law — the cited sources are the evidence for that, and carry the date each was last checked.",
    "selfTestCases": 7,
    "ratesAreIllustrative": false,
    "sourcesCheckedOn": "2026-10-11"
  },
  "sources": [
    {
      "label": "borger.dk, Lønmodtager og ferie — the official citizen portal (2,08 feriedage per month of employment; 25 feriedage, five weeks, for a full year)",
      "url": "https://www.borger.dk/arbejde-dagpenge-ferie/Oversigt-ferie/loenmodtager-og-ferie",
      "checked": "2026-10-11"
    }
  ],
  "terminalOutput": "daysRemaining",
  "headlineOutput": "daysEntitled",
  "inputs": [
    {
      "name": "monthsWorked",
      "type": "number",
      "label": "Months employed in the ferieår",
      "minimum": 0,
      "maximum": 12
    },
    {
      "name": "daysTaken",
      "type": "number",
      "label": "Feriedage already taken",
      "minimum": 0
    }
  ],
  "outputs": [
    {
      "name": "daysEntitled",
      "type": "number",
      "formula": "($m := $clampFloorCap($n(monthsWorked), 0, $const.monthsPerYear); $m >= $const.monthsPerYear ? $const.annualDays : $round($m * $const.daysPerMonth, 2))"
    },
    {
      "name": "daysRemaining",
      "type": "number",
      "formula": "($r := daysEntitled - $n(daysTaken); $r < 0 ? 0 : $round($r, 1))"
    }
  ],
  "testCases": [
    {
      "description": "N1 a full year is the 25 feriedage borger.dk states",
      "given": {
        "monthsWorked": 12,
        "daysTaken": 0
      },
      "expect": {
        "daysEntitled": 25
      }
    },
    {
      "description": "N2 six months earn 12,48 at the stated monthly rate",
      "given": {
        "monthsWorked": 6,
        "daysTaken": 0
      },
      "expect": {
        "daysEntitled": 12.48
      }
    },
    {
      "description": "N3 one month earns 2,08",
      "given": {
        "monthsWorked": 1,
        "daysTaken": 0
      },
      "expect": {
        "daysEntitled": 2.08
      }
    },
    {
      "description": "N4 eleven months earn 22,88, just short of the full year",
      "given": {
        "monthsWorked": 11,
        "daysTaken": 0
      },
      "expect": {
        "daysEntitled": 22.88
      }
    },
    {
      "description": "N5 no months earn nothing",
      "given": {
        "monthsWorked": 0,
        "daysTaken": 0
      },
      "expect": {
        "daysEntitled": 0
      }
    },
    {
      "description": "N6 days already taken come off the remainder",
      "given": {
        "monthsWorked": 12,
        "daysTaken": 10
      },
      "expect": {
        "daysRemaining": 15
      }
    },
    {
      "description": "N7 taking more than the entitlement never goes negative",
      "given": {
        "monthsWorked": 12,
        "daysTaken": 40
      },
      "expect": {
        "daysRemaining": 0
      }
    }
  ],
  "spec": {
    "id": "holiday-entitlement-denmark",
    "version": "1.0.0",
    "schema": {
      "type": "object",
      "properties": {
        "monthsWorked": {
          "type": "number",
          "maximum": 12,
          "minimum": 0
        },
        "daysTaken": {
          "type": "number",
          "minimum": 0
        },
        "daysEntitled": {
          "type": "number",
          "readOnly": true
        },
        "daysRemaining": {
          "type": "number",
          "readOnly": true
        }
      }
    },
    "constants": {
      "daysPerMonth": 2.08,
      "annualDays": 25,
      "monthsPerYear": 12
    },
    "library": {
      "layers": [
        {
          "id": "statutory",
          "define": "(\n  /* Shared statutory helpers — the canonical copy (docs/sandbox/d8-statutory-families.md §5.4).\n     DO NOT EDIT A SPEC'S INLINED COPY. Edit this file and run `npm run sync:helpers`; a vitest\n     assertion and a Java assertion both require every inlined copy to be byte-identical to this one.\n\n     Why inlined rather than referenced: the `library` section's `ref` form — a library shared\n     between models — is still proposed, gated on the model-references design (see\n     ../../../../docs/design/library/jsonata-library.md). Inlining keeps each spec self-contained,\n     which is what lets `#e=` embedding, `#share=` import and MCP forking work with no resolver.\n\n     TWO TRAPS, both of which fail SILENTLY and both of which bit during the debt-payoff build:\n\n       1. A library function sees ONLY its arguments. It cannot read the consuming document — not\n          through a bare field name, not through `$`, not through `$$`. Everything these helpers\n          need is passed in. (`$const` is late-bound and so would resolve, but relying on it would\n          couple a shared helper to one spec's constant names.)\n       2. ONE null member wrecks a whole aggregate, and the two engines disagree about how. The JS\n          reference implementation THROWS (\"Argument 1 of function sum must be an array of\n          numbers\"); the Java port can instead yield null for the entire aggregate. Neither gives a\n          partial total, and the null-yielding form is the dangerous one because it is silent. So\n          callers coerce with `$n()` below before aggregating, which makes the behaviour identical\n          in both engines — measured, not assumed: see helpers.test.ts.\n\n       3. A PATH STEP DIRECTLY ON A CALL RESULT RETURNS NOTHING in the Java engine. This matters for\n          every caller of $amortize, which is the one helper here returning an object:\n\n              $amortize(p, r, n, 0).months            -> empty in Java, 360 in JS.  WRONG\n              ($a := $amortize(p, r, n, 0); $a.months) -> 360 in both.               RIGHT\n\n          Bind the result to a variable, then step into it. The JS reference accepts both forms, so\n          this is invisible until the page is served by the real engine, and it fails as a blank\n          field rather than an error. Measured with a probe, not inferred — the field simply does\n          not appear. */\n\n  /* Number coercion with an explicit zero default. The guard against trap 2. */\n  $n := function($v) { $v = null or $not($exists($v)) ? 0 : $number($v) };\n\n  /* ISO date -> its year / month / day parts. String slicing rather than $fromMillis formatting:\n     these are statutory dates (\"2026-04-06\"), and a timezone-sensitive round-trip through millis\n     can shift the day, which silently moves a service anniversary across a band boundary. */\n  $isoY := function($d) { $number($substring($d, 0, 4)) };\n  $isoM := function($d) { $number($substring($d, 5, 2)) };\n  $isoD := function($d) { $number($substring($d, 8, 2)) };\n\n  /* Whole years of completed service between two ISO dates. Counts an anniversary as reached only\n     when the month-and-day has arrived, which is what \"completed years of service\" means in every\n     severance statute — not a 365.25-day division, whose drift crosses a 5-year band boundary in\n     the wrong direction roughly one year in four. */\n  $yearsBetween := function($from, $to) { (\n    $y := $isoY($to) - $isoY($from);\n    $beforeAnniversary := $isoM($to) < $isoM($from)\n      or ($isoM($to) = $isoM($from) and $isoD($to) < $isoD($from));\n    $beforeAnniversary ? $y - 1 : $y\n  ) };\n\n  /* Whole completed months between two ISO dates, same convention. */\n  $monthsBetween := function($from, $to) { (\n    $m := ($isoY($to) - $isoY($from)) * 12 + ($isoM($to) - $isoM($from));\n    $isoD($to) < $isoD($from) ? $m - 1 : $m\n  ) };\n\n  /* Inclusive count of days between two ISO dates — both endpoints counted, because a leave year\n     runs from its first day to its last and an employee present on both is present for both.\n     Pro-rata accrual is then $proRataDays(a, b) / $proRataDays(yearStart, yearEnd). */\n  $proRataDays := function($from, $to) {\n    ($toMillis($to) - $toMillis($from)) / 86400000 + 1\n  };\n\n  /* Progressive charge across bands. `$bands` is ordered lowest-first, each {\"upTo\": n, \"rate\": r};\n     the final band's `upTo` is omitted or null to mean \"no ceiling\". Each band's rate applies ONLY\n     to the slice of the amount inside it — the single most common error in a hand-written bracket\n     walk is applying the top rate to the whole amount. Returns 0 for a non-positive amount. */\n  $bandedCharge := function($amount, $bands) { (\n    $a := $n($amount);\n    $a <= 0 ? 0 : $reduce($bands, function($acc, $band) { (\n      $ceiling := $exists($band.upTo) and $band.upTo != null ? $band.upTo : $a;\n      $top := $ceiling < $a ? $ceiling : $a;\n      $slice := $top - $acc.floor;\n      {\n        \"floor\": $top > $acc.floor ? $top : $acc.floor,\n        \"charge\": $acc.charge + ($slice > 0 ? $slice * $n($band.rate) : 0)\n      }\n    ) }, {\"floor\": 0, \"charge\": 0}).charge\n  ) };\n\n  /* Clamp into [floor, cap]. Either bound may be omitted (null) to leave that side open — a benefit\n     with a cap and no floor is as common as one with both. */\n  $clampFloorCap := function($value, $floor, $cap) { (\n    $v := $n($value);\n    $withFloor := $exists($floor) and $floor != null and $v < $floor ? $floor : $v;\n    $exists($cap) and $cap != null and $withFloor > $cap ? $cap : $withFloor\n  ) };\n\n  /* Level annuity payment for a principal over `$months` at `$annualRatePct` nominal, compounded\n     monthly. Falls back to straight-line division at a zero rate, where the standard formula\n     divides by zero. */\n  $annuityPayment := function($principal, $annualRatePct, $months) { (\n    $p := $n($principal);\n    $m := $n($months);\n    $i := $n($annualRatePct) / 1200;\n    $m <= 0 ? 0 : ($i = 0 ? $p / $m : $p * $i * $power(1 + $i, $m) / ($power(1 + $i, $m) - 1))\n  ) };\n\n  /* Amortisation schedule: one row per month until the balance clears or `$months` is reached.\n     Returns {\"payment\", \"months\", \"totalInterest\", \"schedule\": [{month, interest, principal,\n     balance}]}. `$extra` is an optional monthly overpayment.\n\n     A real month-by-month fold rather than a closed form, because an overpayment changes every\n     later row — the same reason debt-payoff simulates. Bounded by `$months`, so it always\n     terminates. */\n  $amortize := function($principal, $annualRatePct, $months, $extra) { (\n    $i := $n($annualRatePct) / 1200;\n    $pay := $annuityPayment($principal, $annualRatePct, $months) + $n($extra);\n    $r := $reduce([1..$n($months)], function($acc, $month) {\n      $acc.balance <= 0 ? $acc : (\n        /* The running balance is kept UNROUNDED and only the emitted row is rounded. Rounding the\n           balance each month instead accumulates drift: at 200,000 over 360 months it left 2.83\n           still owing in the final row, which would break the \"final balance is zero\" invariant\n           (§7.3) and look to a reader like the schedule does not pay the loan off. Lenders compute\n           on the exact balance and adjust the last payment, which is what this does. */\n        $interest := $acc.balance * $i;\n        $due := $acc.balance + $interest < $pay ? $acc.balance + $interest : $pay;\n        $principalPart := $due - $interest;\n        $balance := $acc.balance - $principalPart;\n        {\n          \"balance\": $balance,\n          \"totalInterest\": $acc.totalInterest + $interest,\n          \"schedule\": $append($acc.schedule, [{\n            \"month\": $month,\n            \"interest\": $round($interest, 2),\n            \"principal\": $round($principalPart, 2),\n            \"balance\": $round($balance, 2)\n          }])\n        }\n      )\n    }, {\"balance\": $n($principal), \"totalInterest\": 0, \"schedule\": []});\n    {\n      \"payment\": $round($pay, 2),\n      \"months\": $count($r.schedule),\n      \"totalInterest\": $round($r.totalInterest, 2),\n      \"schedule\": [$r.schedule]\n    }\n  ) };\n\n  [\"n\", \"isoY\", \"isoM\", \"isoD\", \"yearsBetween\", \"monthsBetween\", \"proRataDays\",\n   \"bandedCharge\", \"clampFloorCap\", \"annuityPayment\", \"amortize\"]\n)\n"
        }
      ]
    },
    "defaultValues": [
      {
        "path": "$",
        "expr": "{ 'monthsWorked': 12, 'daysTaken': 0 }"
      }
    ],
    "derivations": [
      {
        "path": "$.daysEntitled",
        "expr": "($m := $clampFloorCap($n(monthsWorked), 0, $const.monthsPerYear); $m >= $const.monthsPerYear ? $const.annualDays : $round($m * $const.daysPerMonth, 2))"
      },
      {
        "path": "$.daysRemaining",
        "expr": "($r := daysEntitled - $n(daysTaken); $r < 0 ? 0 : $round($r, 1))"
      }
    ],
    "constraints": [],
    "viewDefinition": {
      "renderer": "builtin",
      "defaultView": "main",
      "views": [
        {
          "id": "main",
          "label": "Ferie",
          "layout": "vertical",
          "components": [
            {
              "id": "note",
              "type": "staticText",
              "text": "borger.dk: “Du optjener 2,08 dages betalt ferie for hver måned, du er ansat” and “Det svarer til, at du optjener 25 feriedage, hvis du er ansat et helt år” — 2,08 a month, 25 a year, five weeks. Multiply the first by twelve and you get 24,96, so the monthly figure is the annual one rounded to two decimals. This page uses each where the authority uses it rather than picking one and being wrong at the other end."
            },
            {
              "id": "inputs",
              "type": "fieldSet",
              "label": "Dine oplysninger",
              "components": [
                {
                  "id": "monthsWorked",
                  "type": "numericField",
                  "label": "Months employed in the ferieår",
                  "bind": "$.monthsWorked",
                  "helperText": "You earn 2,08 feriedage a month whether you work full time, part time or only a few days a week."
                },
                {
                  "id": "daysTaken",
                  "type": "numericField",
                  "label": "Feriedage already taken",
                  "bind": "$.daysTaken"
                }
              ]
            },
            {
              "id": "sep",
              "type": "separatorLine"
            },
            {
              "id": "entitledTile",
              "type": "statTile",
              "label": "Feriedage earned",
              "value": "$.daysEntitled"
            },
            {
              "id": "remainingTile",
              "type": "statTile",
              "label": "Feriedage remaining",
              "value": "$.daysRemaining"
            },
            {
              "id": "assumptions",
              "type": "staticText",
              "text": "The accrual is flat per month of employment and does not depend on your hours — borger.dk says so expressly — which is why this page asks for months and nothing else. Denmark runs concurrent holiday: leave is earned and may be taken in overlapping periods under the 2020 Ferielov, and the right is to five weeks in total across the holiday period. Where more than four weeks has been earned in a ferieår, up to one week may be carried into the next holiday period. Ferietillæg and feriepenge are holiday PAY, computed as 12,5% of salary, and are not days; this page does not compute them. Collective agreements commonly provide a sixth week."
            },
            {
              "id": "sources",
              "type": "sourceList",
              "label": "Kilder",
              "layers": 1,
              "exempt": [
                "monthsPerYear"
              ],
              "items": [
                {
                  "label": "borger.dk, Lønmodtager og ferie — the official citizen portal (2,08 feriedage per month of employment; 25 feriedage, five weeks, for a full year)",
                  "url": "https://www.borger.dk/arbejde-dagpenge-ferie/Oversigt-ferie/loenmodtager-og-ferie",
                  "date": "2026-10-11",
                  "covers": [
                    "daysPerMonth",
                    "annualDays"
                  ]
                }
              ]
            }
          ]
        }
      ]
    },
    "tests": [
      {
        "description": "N1 a full year is the 25 feriedage borger.dk states",
        "given": {
          "$.monthsWorked": 12,
          "$.daysTaken": 0
        },
        "expect": {
          "$.daysEntitled": 25
        }
      },
      {
        "description": "N2 six months earn 12,48 at the stated monthly rate",
        "given": {
          "$.monthsWorked": 6,
          "$.daysTaken": 0
        },
        "expect": {
          "$.daysEntitled": 12.48
        }
      },
      {
        "description": "N3 one month earns 2,08",
        "given": {
          "$.monthsWorked": 1,
          "$.daysTaken": 0
        },
        "expect": {
          "$.daysEntitled": 2.08
        }
      },
      {
        "description": "N4 eleven months earn 22,88, just short of the full year",
        "given": {
          "$.monthsWorked": 11,
          "$.daysTaken": 0
        },
        "expect": {
          "$.daysEntitled": 22.88
        }
      },
      {
        "description": "N5 no months earn nothing",
        "given": {
          "$.monthsWorked": 0,
          "$.daysTaken": 0
        },
        "expect": {
          "$.daysEntitled": 0
        }
      },
      {
        "description": "N6 days already taken come off the remainder",
        "given": {
          "$.monthsWorked": 12,
          "$.daysTaken": 10
        },
        "expect": {
          "$.daysRemaining": 15
        }
      },
      {
        "description": "N7 taking more than the entitlement never goes negative",
        "given": {
          "$.monthsWorked": 12,
          "$.daysTaken": 40
        },
        "expect": {
          "$.daysRemaining": 0
        }
      }
    ]
  }
}