Calculate Peruvian Gratificación (Statutory Semi-Annual Bonus)

Purpose

Compute a Peruvian worker's legal gratificación — the mandatory bonus paid each July (Fiestas Patrias) and December (Navidad) under Ley 27735 — using the SueldoJusto calculator at sueldojusto.pe. Given a monthly gross salary plus a few labor parameters (labor regime, health-insurance type, family allowance, months worked, unexcused absences), it returns the computable base, the extraordinary bonus (9% EsSalud / 6.75% EPS), and the total to receive. Read-only: it only reads the calculator's output, never submits personal data anywhere.

When to Use

A worker or advisor wants to estimate the July or December gratificación for a given salary.
You need to model different scenarios: general vs. small-enterprise (MYPE) regimes, EsSalud vs. EPS, with/without family allowance, partial semesters, or absence deductions.
Anywhere you'd otherwise reimplement the Ley 27735 formula by hand — the calculator applies the current-year constants (RMV 2026 = S/1,130; asignación familiar = S/113.00) and regime factors for you.

Workflow

This is a fully client-side calculator (Astro + React). There is no API, no network request, and no submitted form — the result is computed in-browser after you click "Calcular Gratificación". So the only method is driving the page; there is no fetch/API shortcut to prefer. A plain Browserbase remote session passes the site's Cloudflare layer with no --proxies or --verified needed (verified empirically — see Gotchas).

Open the calculator directly: browse open https://sueldojusto.pe/herramientas/calculadora-gratificacion/ --remote. Then browse wait timeout 2000 and browse snapshot.
Dismiss the cookie dialog: click the button labeled "Entendido" (dialog "Aviso de cookies y publicidad"). Snapshot again — refs shift after it closes.
Salary: browse fill "#salary" <amount> (e.g. 3000). This is the "Sueldo Mensual Bruto (S/)" field, a plain numeric input (id salary).
Labor regime (default already "Régimen General (100%)"): to change, click the combobox labeled "Régimen Laboral", then click one of the listbox options: Régimen General (100%), Pequeña Empresa (50%), or Microempresa (0%).
Health insurance (default "EsSalud (bonificación 9%)"): to change, click the "Tipo de Seguro de Salud" combobox, then click EsSalud (bonificación 9%) or EPS (bonificación 6.75%).
Family allowance (Asignación Familiar): click the checkbox labeled "Recibo Asignación Familiar (+S/ 113.00)". Verify in the next snapshot that it reads [checked]. Adds S/113.00 to the computable base.
Months worked (default 6): the "Tiempo Trabajado en el Semestre" section has a listbox of 1–6 completed months (or a "Usar fechas exactas" mode for exact ingreso/cese dates). Leave at 6 for a full semester.
Unexcused absences (default 0): the "Días de Inasistencia Injustificada" numeric field. Each absence deducts 1/30 of the gratificación.
Calculate: click the button "Calcular Gratificación". Then browse wait timeout 1500 and browse snapshot.
Read the results card (heading "Tu Gratificación de Julio/Diciembre"):
- Sueldo base: — the entered salary.
- Base de gratificación: — computable remuneration = salary + asignación familiar (+ any regular-income average).
- Bonificación extraordinaria (9% | 6.75%): +S/ … — the tax-free extraordinary bonus.
- Tiempo trabajado: 180 días (6.0 meses).
- TOTAL A RECIBIR: S/ … — the final amount to receive.
A "Copiar resultado" button copies the full breakdown to clipboard.

Site-Specific Gotchas

No API / no submit round-trip. The calculation runs entirely in client-side JS; there is no backend endpoint to call and nothing to intercept. Driving the page is the only method — don't waste time hunting for a JSON API.
Cloudflare present but permissive. The homepage sits behind Cloudflare, but both browse cloud fetch --proxies and a plain browse open --remote (Browserbase default stealth, no --proxies, no --verified) returned HTTP 200 and rendered the calculator. The pre-run probe flagged likelyNeedsProxies: true, but that was not borne out — a bare remote session works. Proxies remain a safe fallback if the site tightens.
Custom Radix controls, not native <select>. Régimen, Tipo de Seguro, and Meses are custom listbox comboboxes; Asignación Familiar is a custom checkbox. There is a hidden native <select> (aria-hidden, off-screen) for each, but setting the native select via browse select does NOT update React state — the result won't change. Always click the visible combobox trigger, then click the option from the a11y snapshot; toggle the checkbox by its labeled ref and confirm [checked].
You must click "Calcular Gratificación". The result card does not auto-update on every keystroke; snapshot again after clicking — the result card's refs (11-2xxx range) are freshly created each calculation.
Pequeña Empresa (50%) display quirk. For the small-enterprise regime, the card still shows the full computable in "Base de gratificación" (e.g. S/3,113.00), but the gratificación actually paid — and the amount the bonus is computed on — is 50% of it. Only the "TOTAL A RECIBIR" reflects the halving. Don't read "Base de gratificación" as the payable gratificación for MYPE. Microempresa (0%) yields no legal gratificación.
Bonus base. The extraordinary bonus (9% EsSalud / 6.75% EPS) is applied to the regime-adjusted gratificación, not the raw computable. E.g. Pequeña + EPS on S/3,113 computable → gratificación S/1,556.50 → bonus 6.75% = S/105.06.
Current-year constants are baked in. The page is stamped "Actualizado 2026 · Ley 27735"; asignación familiar = S/113.00 (10% of RMV S/1,130). These update yearly with the minimum wage — read them off the live page rather than hardcoding.
Deterministic. Same inputs always produce the same output; no randomness, so a single clean run is authoritative.

Expected Output

Régimen General + EsSalud + Asignación Familiar, salary S/3,000, 6 months, 0 absences (verified by both a manual browse run and an independent autobrowse run):

{
  "success": true,
  "inputs": {
    "regimen": "general",
    "salary": 3000,
    "tipo_seguro": "essalud",
    "asignacion_familiar": true,
    "months_worked": 6,
    "absences": 0
  },
  "sueldo_base": 3000.00,
  "base_gratificacion": 3113.00,
  "gratificacion_bruta": 3113.00,
  "bonificacion_extraordinaria": 280.17,
  "total_a_recibir": 3393.17,
  "currency": "PEN",
  "period": "julio",
  "error_reasoning": null
}

Pequeña Empresa (50%) + EPS (6.75%), same salary/months (distinct outcome shape — regime halving + EPS rate):

{
  "success": true,
  "inputs": {
    "regimen": "pequena",
    "salary": 3000,
    "tipo_seguro": "eps",
    "asignacion_familiar": true,
    "months_worked": 6,
    "absences": 0
  },
  "sueldo_base": 3000.00,
  "base_gratificacion": 3113.00,
  "gratificacion_bruta": 1556.50,
  "bonificacion_extraordinaria": 105.06,
  "total_a_recibir": 1661.56,
  "currency": "PEN",
  "period": "julio",
  "error_reasoning": null
}

Failure shape (page blocked or calculator failed to render):

{
  "success": false,
  "inputs": null,
  "total_a_recibir": null,
  "currency": "PEN",
  "error_reasoning": "Describe what went wrong (e.g. Cloudflare challenge, calculator did not render)."
}