13th Month Salary

13th month salary (also called 13th month pay, 13th salary, or aguinaldo in Latin America) is an additional payment equal to approximately one month’s base salary, paid annually on top of an employee’s regular twelve monthly wages. The payment is mandatory by law in many countries (including most of Latin America, the Philippines, Indonesia, India in some sectors, Italy, Spain, Portugal, and Greece), customary but not legally required in others (Germany, Netherlands, Switzerland, Singapore, Hong Kong, Japan, China, Taiwan, Vietnam, UAE), and entirely optional in jurisdictions like the United States, the United Kingdom, and Australia.

For international employers, the 13th month salary is one of the most commonly overlooked compensation costs when budgeting global hires. A new hire on a €36,000 annual gross salary in a 12-payment country and a €36,000 annual gross salary in a 13-payment country are not the same offer: in the latter, the employee receives an additional €3,000 each year, raising the effective annual cost by 8.33%. In a 14-payment country, that uplift rises to 16.67%. Misunderstanding this distinction can result in non-compliance penalties, underpaid employees, or budgets that underestimate fully-loaded costs by thousands per employee per year.

This glossary entry explains exactly what 13th month salary is, where it is mandatory versus customary, how it is calculated, when it must be paid, how it is taxed, and what international employers need to know to budget and pay it correctly.

The 13th month salary is an additional annual payment equivalent to approximately one-twelfth (1/12) of an employee’s annual base salary, paid as a single lump sum or in two instalments depending on the country. In most jurisdictions where it applies, the payment equals one month of base pay, calculated on gross salary excluding overtime, allowances, commissions, and discretionary bonuses (although specific inclusion rules vary by country).

The payment goes by different names across different markets:

• Aguinaldo in Mexico, Argentina, Costa Rica, Dominican Republic, Ecuador, El Salvador, Honduras, Panama, Paraguay, Peru, Uruguay, and Venezuela
• Décimo terceiro salário (or simply décimo) in Brazil; see our dedicated guide to 13º Salário (Décimo Terceiro) for full Brazilian rules
• Prima de servicios in Colombia (split into two instalments)
• Tredicesima in Italy (with the 14th month called quattordicesima)
• Pagas extraordinarias in Spain (split into 13th and 14th payments)
• Tunjangan Hari Raya (THR) in Indonesia, paid before religious holidays
• Bono 14 in Guatemala (the 14th month bonus, paid in July)
• Weihnachtsgeld (Christmas money) in Germany, when offered customarily

Despite the different names, the underlying concept is consistent: an additional payment, typically equal to one month of salary, designed to provide employees with extra income for end-of-year expenses, holidays, or religious festivals.

The 13th month salary originated in Italy in the early 20th century as gratifica natalizia (Christmas bonus) and was later codified into Italian law. The Philippines became the first country to mandate it nationally through Presidential Decree No. 851 in 1975 under President Ferdinand Marcos. From the Philippines, the practice spread across former Spanish colonies in Latin America, where it became culturally embedded as a Christmas bonus to compensate for low minimum wages.

There are three legal categories of 13th month salary worldwide: mandatory (required by law, with penalties for non-payment), customary (not legally required but widely expected and often included in employment contracts), and discretionary (entirely at employer choice, with no legal or strong customary obligation).

Mandatory countries impose statutory deadlines, calculation formulas, and penalties for non-payment. Failing to pay can result in fines, mandatory back payments with interest, and labour court action. Examples include the Philippines (deadline 24 December), Brazil (two instalments, 30 November and 20 December), and Mexico (deadline 20 December).

Customary countries have no statutory mandate but employees expect 13th month payments based on long-standing market practice. In Germany, around half of all employees receive a Christmas bonus (Weihnachtsgeld) through collective bargaining agreements (Tarifverträge). In China and Vietnam, the Lunar New Year bonus is so deeply expected that omitting it can trigger resignations and reputational damage. Once a customary 13th month is documented in an employment contract, it becomes contractually enforceable even though not statutorily required.

Discretionary countries have neither a legal mandate nor a strong cultural expectation. In the United States and the United Kingdom, employers typically offer discretionary year-end bonuses tied to performance rather than fixed 13th month salary structures.

The standard formula in most countries is straightforward:

13th month pay = Annual base salary ÷ 12

For a full-year employee earning €36,000 gross per year, the 13th month payment equals €3,000. For employees who started or left mid-year, the calculation is prorated based on months actually worked:

Prorated 13th month = (Total basic salary earned ÷ 12) × (Months worked ÷ 12)

Country-specific calculation differences:

What counts as “base salary”: In most jurisdictions, the calculation uses base monthly pay only, excluding overtime, commissions, allowances, and discretionary bonuses. However, some countries include specific items: Brazil includes average commissions and overtime, Italy includes contractual fixed allowances, and the Philippines may include allowances if they are considered part of basic salary by company practice or collective bargaining agreement. Always confirm the inclusion rules for the specific country before calculating.

Statutory deadlines for 13th month payments vary significantly by country, and missing them can trigger fines, interest, or legal claims.

Some countries (Spain, Colombia, Argentina, Italy) split the payment into two instalments. Others (Philippines, Mexico, Brazil) require a single year-end payment. Indonesia’s THR is religion-aware: Muslim employees receive it before Eid al-Fitr, Christian employees before Christmas, Hindu employees before Nyepi, and Buddhist employees before Vesak.

Penalties for late or missed payment: Most mandatory countries impose fines, interest charges, and reporting obligations. The Philippines requires employers to file a compliance report with the Department of Labor and Employment (DOLE) by 15 January each year. Brazil charges interest plus monetary correction on late payments. Indonesia imposes administrative fines plus interest until paid. International employers should treat 13th month deadlines as critical compliance dates, not soft targets.

Tax treatment of 13th month pay varies dramatically by country. In some jurisdictions, all or part of the payment is tax-exempt; in others it is fully taxable as regular employment income; in some it can push employees into a higher tax bracket for that month.

Social security contributions: 13th month pay is typically subject to social security contributions in most countries that mandate it, including Italy (INPS), Spain (Seguridad Social), Brazil (INSS), Argentina (ANSES), and Mexico (IMSS). The Philippines is a notable exception: 13th month pay is excluded from SSS, PhilHealth, and Pag-IBIG contributions because these are calculated on monthly basic salary only.

Timing affects tax year: A 13th month paid in December is counted as income for that tax year. A payment delayed into January falls into the next tax year, which may benefit or disadvantage employees depending on their circumstances. In countries with progressive tax brackets, the lump-sum nature of the 13th month can push monthly withholding tax higher than normal, although annual reconciliation typically corrects any over-withholding.

Some countries go beyond the 13th month and mandate or customarily pay a 14th, 15th, or even higher monthly bonus. Understanding which countries have multi-bonus structures is critical for accurate compensation budgeting.

• Spain: Two pagas extraordinarias (effectively 13th and 14th payments), both legally mandated
• Greece: 14th month is mandatory, paid as Christmas (one month), Easter (half month), and summer vacation (half month)
• Portugal: 14th month is mandatory, paid as a holiday subsidy (subsídio de férias) in summer
• Italy: 14th month (quattordicesima) is mandated by many CCNL collective bargaining agreements but not by general labour law
• Guatemala: 14th month (Bono 14) is mandatory, paid in July
• Costa Rica: Aguinaldo (13th) is mandatory; some sectors pay an additional 14th customarily
• Belgium: 13th month customary; some sectors customarily pay a 14th
• Switzerland: 13th month customary; some sectors customarily pay a 14th
• Austria: Two extra payments (Urlaubsgeld and Weihnachtsgeld) are effectively 13th and 14th months under most CCNL agreements, taxed at a reduced rate (6%) up to a threshold
• Philippines (customary): Some companies voluntarily pay 14th, 15th, or up to 20-month bonuses for senior positions

Beyond the 14th month, certain Latin American countries have additional cash bonuses linked to vacation, profit-sharing, or seniority. Brazil mandates a vacation bonus (1/3 of monthly salary) on top of the 13th month. Argentina has a similar holiday entitlement. Ecuador requires a 14th month equal to the minimum wage paid in March or August.

The 13th month structure changes the effective annual cost

A salary advertised as €36,000 gross in a 12-payment country and a salary advertised as €36,000 gross in a 13-payment country are not equivalent. The 13-payment country adds €3,000 of mandatory uplift; a 14-payment country adds €6,000. Always benchmark on annual gross including statutory bonuses, not on headline monthly numbers.

Confirm whether the 13th month is mandatory or customary

In customary countries (Germany, Switzerland, Netherlands, Singapore, China, Japan, Vietnam), there is no legal obligation but strong market expectation. Omitting it makes offers uncompetitive even where it is not strictly required. Confirm the local market practice before structuring compensation.

Plan cash flow around statutory deadlines

Most mandatory countries require payment by specific dates (24 December in the Philippines, 20 December in Mexico, 30 November and 20 December in Brazil). Late payment triggers fines and interest. Build December payroll cash flow planning around these dates.

Apply correct calculation rules per country

Italy divides annual salary by 13, Spain by 14, the Philippines by 12, and Mexico uses a 15-day formula. Misapplying the formula leads to either underpayment (legal claims) or overpayment (unnecessary cost). Always use country-specific rules.

Account for social security and income tax obligations

In most countries the 13th month is fully subject to social security contributions and income tax. The Philippines is a rare exception, with ₱90,000 of 13th month plus other benefits being tax-exempt under the TRAIN Law. Check local rules before assuming any tax-free treatment.

Watch for 14th month obligations

Several countries mandate or customarily pay a 14th month bonus on top of the 13th, including Spain, Portugal, Greece, Guatemala, and many CCNL-covered sectors in Italy and Austria. Check whether the role and sector trigger a 14th month before finalising the offer.

Document the 13th month in employment contracts

Even in customary countries, once you commit to paying the 13th month in an employment contract, it becomes contractually enforceable. Specify the calculation method, payment timing, and pro-ration rules clearly to avoid disputes at separation.