How the Poland urlop wypoczynkowy calculator is verified

Inputs

Input	Field	Type
Years of employment (total, any employer)	`serviceYears`	number
Working time as a % of full time	`employmentPercent`	number
Days already taken	`daysTaken`	number

The formula

Each derived value below is computed by the Valem engine from the expression shown, in this order. Nothing else runs — there is no hidden code path.

Derived value	Field	Formula (JSONata)
Full Time Days	`fullTimeDays`	`($n(serviceYears) >= $const.serviceThresholdYears ? $const.daysFrom10Years : $const.daysUnder10Years)`
Proportional Days	`proportionalDays`	`fullTimeDays * $n(employmentPercent) / 100`
Days Entitled	`daysEntitled`	`$clampFloorCap($ceil(proportionalDays), 0, fullTimeDays)`
Days Remaining	`daysRemaining`	`($r := daysEntitled - $n(daysTaken); $r < 0 ? 0 : $round($r, 1))`

Rates and thresholds

The expressions above read these as $const. They are the figures the annual refresh replaces, so they live as data rather than being written into the formulas — which is what makes a year-on-year change a one-line diff instead of an edit to arithmetic.

Constant	Value
`daysUnder10Years`	20
`daysFrom10Years`	26
`serviceThresholdYears`	10

Test vectors (9)

Every case is executed against this model on each build, by the Java engine and independently by a JavaScript one. A mismatch of a single cent fails the build, so the page cannot ship advertising a figure the model no longer produces.

Case 1 — L1 under ten years' employment, full time: 20 days

given `serviceYears`	5
given `employmentPercent`	100
given `daysTaken`	0
expect `fullTimeDays`	20
expect `daysEntitled`	20

Case 2 — L2 at ten years it steps to 26 — there is nothing in between

given `serviceYears`	10
given `employmentPercent`	100
given `daysTaken`	0
expect `fullTimeDays`	26
expect `daysEntitled`	26

Case 3 — L3 nine years is still the lower band: “co najmniej 10 lat” is at least ten

given `serviceYears`	9
given `employmentPercent`	100
given `daysTaken`	0
expect `fullTimeDays`	20
expect `daysEntitled`	20

Case 4 — L4 3/4 etatu on the 26-day band is 19.5, which § 2 rounds UP to 20

given `serviceYears`	12
given `employmentPercent`	75
given `daysTaken`	0
expect `proportionalDays`	19.5
expect `daysEntitled`	20

Case 5 — L5 half time on the 20-day band is exactly 10, so the round-up changes nothing

given `serviceYears`	3
given `employmentPercent`	50
given `daysTaken`	0
expect `proportionalDays`	10
expect `daysEntitled`	10

Case 6 — L6 a third of full time on the lower band: 6.667 rounds up to 7

given `serviceYears`	3
given `employmentPercent`	33
given `daysTaken`	0
expect `daysEntitled`	7

Case 7 — L7 § 3's ceiling: the pro-rated figure can never exceed § 1's

given `serviceYears`	30
given `employmentPercent`	100
given `daysTaken`	0
expect `daysEntitled`	26

Case 8 — L8 days already taken come off the remainder, and it never goes negative

given `serviceYears`	12
given `employmentPercent`	100
given `daysTaken`	30
expect `daysRemaining`	0

Case 9 — L9 days taken below the entitlement leave the balance

given `serviceYears`	12
given `employmentPercent`	100
given `daysTaken`	6
expect `daysEntitled`	26
expect `daysRemaining`	20

Sources

Kodeks pracy, art. 154 — tekst jednolity, Dz. U. 2026 poz. 1245 (Sejm ELI; stan prawny na 27 sierpnia 2026 r.): the two bands, the part-time proportion with its round-up, and § 3's ceiling · checked 2026-10-11

Check it yourself — and reuse it

The whole model as JSON — inputs, outputs, formulas, vectors and sources in one re-runnable document.

This model is published under CC BY 4.0: use it, adapt it, build on it, with attribution. The licence covers the model — the expression of each rule and the arrangement of the catalog. The rates and thresholds are law, and nobody licenses those; the sources above are where they come from.

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