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The 13th Salary (Décimo Terceiro Salário) calculator helps Brazilian employees and employers compute the mandatory year-end bonus that all formal CLT employees are entitled to receive. Also known as the gratificação natalina, the 13th salary is equivalent to one extra month's salary paid annually and is guaranteed by the Brazilian Constitution (Article 7, VIII) and regulated by Law 4.090/1962. It is paid in two instalments. The first instalment (adiantamento) of 50% of the gross salary must be paid between February 1st and November 30th — employers can choose to pay it with vacation pay (férias) on the employee's request. The second instalment must be paid by December 20th and represents the remaining 50% of the 13th salary minus applicable deductions. The calculation is based on the employee's reference salary for December or the last salary received. If the employee worked less than 12 full months in the year, the 13th is calculated proportionally: for each complete month worked (or fraction above 14 days), the employee earns 1/12 of the monthly salary. Both instalments attract INSS deductions. The IRRF (income tax withholding) applies only to the second instalment and is calculated on the full 13th salary amount less INSS, using the progressive IRPF table applied exclusively to this income. The 13th salary is not aggregated with the regular December salary for tax purposes — it is taxed separately and exclusively.
Full 13th = Monthly Salary × (Months Worked / 12); First Instalment = Full 13th × 50% (no IRRF, INSS applies); Second Instalment = Full 13th × 50% - INSS on full 13th - IRRF on (Full 13th - INSS); IRRF calculated on full 13th base after INSS deduction
- 1Determine the employee's reference salary for December (last salary of the year).
- 2Count complete months worked (fractions above 14 days in a month count as a full month).
- 3Calculate the proportional 13th: Salary × months/12.
- 4Pay the first instalment (50% of gross 13th) between February and November with no IRRF.
- 5Calculate INSS on the full 13th amount using the progressive employee INSS table.
- 6Calculate IRRF on the 13th separately: apply progressive IRPF rates to (Full 13th - INSS on 13th).
- 7Pay the second instalment by December 20th: Full 13th × 50% - INSS on full 13th - IRRF on 13th.
Total received: R$2,500 + R$1,735 = R$4,235 net
INSS and IRRF are only finally deducted on the second instalment payment, though INSS applies on the full 13th salary. The net 13th is significantly less than R$5,000 gross.
Proportional for partial year employment
8/12 of R$4,000 gives a proportional 13th of R$2,666.67. Deductions (INSS and IRRF) are calculated on this proportional base, not on the full salary.
IRRF calculated exclusively on 13th base, separate from December salary
The 13th salary is taxed as a standalone income event, not added to the regular December paycheck. This prevents bracket creep that would occur if both were aggregated.
Accrued 13th is part of severance pay (verbas rescisórias)
On dismissal, the employer must pay the accrued proportional 13th as part of the severance package. INSS and IRRF apply as usual on the accrued amount.
Calculating net 13th salary to plan holiday spending and year-end budget.. This application is commonly used by professionals who need precise quantitative analysis to support decision-making, budgeting, and strategic planning in their respective fields
Employers computing total December payroll cost including 13th salary, FGTS, and employer INSS.. Industry practitioners rely on this calculation to benchmark performance, compare alternatives, and ensure compliance with established standards and regulatory requirements
HR departments verifying payroll system accuracy for 13th salary calculations in December.. Academic researchers and students use this computation to validate theoretical models, complete coursework assignments, and develop deeper understanding of the underlying mathematical principles
Employees checking proportional 13th entitlement when being dismissed mid-year.. Financial analysts and planners incorporate this calculation into their workflow to produce accurate forecasts, evaluate risk scenarios, and present data-driven recommendations to stakeholders
Planning cash flow for November-December when the full 13th payment is a significant payroll obligation.. This application is commonly used by professionals who need precise quantitative analysis to support decision-making, budgeting, and strategic planning in their respective fields
Employees with variable salary
{'title': 'Employees with variable salary', 'body': 'For sales employees or others with variable pay, the 13th base is calculated using the average of all remuneration components throughout the year. Commissions in December are recalculated when final December numbers are known.'} When encountering this scenario in brazil 13th salary calculations, users should verify that their input values fall within the expected range for the formula to produce meaningful results. Out-of-range inputs can lead to mathematically valid but practically meaningless outputs that do not reflect real-world conditions.
New employees in same year
Since this is less than 15 days in September, September does not count. Only October and November complete months count, giving 2/12.'} This edge case frequently arises in professional applications of brazil 13th salary where boundary conditions or extreme values are involved. Practitioners should document when this situation occurs and consider whether alternative calculation methods or adjustment factors are more appropriate for their specific use case.
Employees on maternity or sick leave
{'title': 'Employees on maternity or sick leave', 'body': 'Months in which the employee received maternity benefit (salário-maternidade) or INSS sickness benefit (auxílio-doença) still count as worked months for the 13th salary calculation.'} In the context of brazil 13th salary, this special case requires careful interpretation because standard assumptions may not hold. Users should cross-reference results with domain expertise and consider consulting additional references or tools to validate the output under these atypical conditions.
PLR (Profit Sharing) and 13th salary
{'title': 'PLR (Profit Sharing) and 13th salary', 'body': 'PLR is not the same as the 13th salary and does not affect the 13th calculation base. PLR has its own separate tax treatment (exclusive at source) and is not a constitutional entitlement.'} When encountering this scenario in brazil 13th salary calculations, users should verify that their input values fall within the expected range for the formula to produce meaningful results. Out-of-range inputs can lead to mathematically valid but practically meaningless outputs that do not reflect real-world conditions.
| Instalment | When Paid | Amount | Deductions |
|---|---|---|---|
| 1st Instalment (adiantamento) | Feb 1 – Nov 30 | 50% of full 13th (gross) | INSS (optional advance withholding in some cases) |
| 2nd Instalment | By December 20th | 50% of full 13th | INSS on full 13th + IRRF on 13th net of INSS |
| Dismissal (accrued) | Within 10 days of dismissal | Proportional months/12 | INSS + IRRF applicable |
Is the 13th salary mandatory?
Yes. The 13th salary is a constitutional right for all formal CLT employees in Brazil, including domestic workers. Failing to pay it on time incurs penalties and interest. This is an important consideration when working with brazil 13th salary calculations in practical applications. The answer depends on the specific input values and the context in which the calculation is being applied.
When is the first instalment due?
The first instalment must be paid between February 1st and November 30th. Most companies choose to pay it in November or with vacation pay, but any time in this window is legal. This applies across multiple contexts where brazil 13th salary values need to be determined with precision. Common scenarios include professional analysis, academic study, and personal planning where quantitative accuracy is essential.
Is IRRF deducted from the first instalment?
No. IRRF is not withheld from the first instalment. Only INSS applies to the first payment. IRRF on the entire 13th salary is withheld only from the second instalment in December. This is an important consideration when working with brazil 13th salary calculations in practical applications. The answer depends on the specific input values and the context in which the calculation is being applied.
What salary base is used for the 13th?
The base is the December salary, including habitual bonuses, variable salary averages, commissions, and habitual allowances that form part of the regular remuneration. One-time payments are excluded. This is an important consideration when working with brazil 13th salary calculations in practical applications. The answer depends on the specific input values and the context in which the calculation is being applied.
Does 13th salary generate FGTS?
Yes. The 13th salary generates FGTS. The employer must deposit 8% of the 13th salary amount into the employee's FGTS account at the same time as the salary deposit. This is an important consideration when working with brazil 13th salary calculations in practical applications. The answer depends on the specific input values and the context in which the calculation is being applied.
How is the 13th calculated for variable salary employees?
For employees with variable compensation (commissions, bonuses), the 13th salary base is the average of all variable payments received during the year divided by the months worked. The process involves applying the underlying formula systematically to the given inputs. Each variable in the calculation contributes to the final result, and understanding their individual roles helps ensure accurate application. Most professionals in the field follow a step-by-step approach, verifying intermediate results before arriving at the final answer.
What happens to the 13th on dismissal?
On dismissal, the employer must pay the proportional accrued 13th salary (pro-rata for months worked in the current year) as part of the verbas rescisórias (severance pay). This is an important consideration when working with brazil 13th salary calculations in practical applications. The answer depends on the specific input values and the context in which the calculation is being applied.
Can the 13th salary be paid in advance at the employee's request?
Yes. The employee can request the first instalment of the 13th be paid together with their vacation pay. This is common and the employer must comply if the request is made in the first semester. This is an important consideration when working with brazil 13th salary calculations in practical applications. The answer depends on the specific input values and the context in which the calculation is being applied.
Pro Tips
When the second instalment is calculated in December, recalculate INSS and IRRF based on the December salary, not the November salary used for the first instalment. If the employee received a raise during the year, the base should be the current December salary — which may increase the 13th and change the tax calculation slightly.
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The 13th salary was created by Law 4.090 in 1962 during the government of João Goulart as part of workers' rights expansion. Known informally as the 'Christmas bonus' (gratificação natalina), it generates an estimated R$250–300 billion in extra consumer spending in November and December each year — one of Brazil's biggest annual economic stimulus events and a critical driver of year-end retail sales.