Thirteenth Month Pay in Panama: How It's Calculated and When It's Paid

Thirteenth month pay is one of the best-known benefits under Panamanian labor law, and also one of the most error-prone to calculate — not because it’s complicated, but because it’s paid at three different points in the year, and it’s easy to lose track of how much belongs to each installment. This article covers how it works.

What Thirteenth Month Pay Is

Thirteenth month pay is an additional benefit equal to one month’s salary per year, which Panamanian law requires be paid to every employee, split into three equal installments throughout the year instead of being paid all at once in December, as happens in other countries in the region.

The Three Installments of the Year

Each installment is one-third of the thirteenth month, calculated on what was earned during the corresponding four-month period, and it’s paid on fixed dates: mid-April, mid-August, and mid-December. That means the thirteenth month isn’t a single annual calculation, but three smaller ones, each with its own reference period.

Who’s Entitled to It

Every employee with a work contract in Panama is entitled to the thirteenth month, whether they work full-time or part-time, and regardless of how long they’ve been employed — if they worked part of a four-month period, they’re owed the proportional share of that installment, not the full installment. This is exactly where businesses that calculate payroll manually go wrong most often: hiring or letting someone go mid-period requires a proportional calculation, not an all-or-nothing one.

Common Mistakes When Calculating It

The three most common mistakes are: calculating the thirteenth month on the payment month’s salary instead of on what was earned across the whole four-month period; forgetting to prorate when an employee starts or leaves mid-period; and failing to include salary components that should count toward the calculation base, such as fixed commissions or recurring overtime, depending on how that person’s salary is structured.

How It Affects the Business’s Cash Flow

Unlike other benefits that build up quietly over the year, the thirteenth month creates three concrete, predictable cash outflow spikes. A business that doesn’t plan for them ahead of time can find that April, August, or December are tighter cash flow months than the rest of the year would suggest, simply because it didn’t calculate ahead of time how much would go out in each installment.

How a System Prevents Manual Error

Calculating the thirteenth month by hand, period by period and employee by employee, is exactly the kind of repetitive calculation where errors pile up without anyone noticing until an employee flags a discrepancy. A system that calculates the thirteenth month automatically from what was earned in each period — prorating hires and departures without you having to do it by hand — removes that risk at the source, instead of relying on someone checking every formula every four months.

If you’d also like to understand how the other payroll deductions are calculated, in How to Calculate Payroll in Panama: CSS, Educational Insurance, and Income Tax Explained we cover CSS, Educational Insurance, and income tax step by step. You can see how Conta24 handles complete Panamanian payroll, including the thirteenth month, on our business page.