13th-month pay calculator vs salary increase

Why comparing the 13th month and a salary increase is essential to optimize your compensation

Between us, it’s not uncommon that you face this question: is it better to negotiate a salary increase or ask for an extra 13th month? The answer isn’t always obvious, especially if you don’t precisely understand what each option represents for your purchasing power. In 2026, this reflection becomes even more strategic given the economic environment and the job market. Understanding how these two types of compensation impact your budget, your pay, and even your social benefits can make all the difference between a successful negotiation and a missed opportunity.

What is often forgotten is that the 13th month, in itself, does not represent a true bonus. It’s an integral part of the annual compensation, often considered a bonus, but it does not necessarily change your monthly cash flow. On the other hand, a raise, if well negotiated, can allow you to sustainably improve your gross salary, your net pay, and your overall purchasing power. So, how do you make sense of this equation? The key is to do a precise calculation. And precisely, here’s how to help you make your choice using our reference tool: the gross-net salary and negotiation calculator.

Understand the fundamentals of the 13th month and the salary increase

You should start by clearly distinguishing these two concepts. The 13th month is a bonus or exceptional payment generally paid in December. It is often a percentage of the annual salary, easily included in the calculation of the annual gross salary. Some sectors or companies give it a prominent place, others less so. It’s up to you to see if your contract includes it or if you can negotiate its implementation.

On the other hand, a salary increase, often discussed during annual reviews or after a probationary period, aims to raise your base salary. It generally has a direct impact on your gross salary, your net pay, but also on your future pension calculation, seniority bonuses, or profit-sharing. Here again, a good calculation must be made to estimate its true value, taking all these factors into account.

Criterion	13th month	Salary increase
Impact on annual income	One-time bonus, paid at the end of the year	Regular and lasting increase of the gross salary
Impact on monthly pay	None, unless the bonus is integrated as a monthly payment	Direct increase of the net amount received each month
Impact on wealth value	Limited impact, unless it becomes a new regular bonus	Positive impact on retirement, seniority bonuses, etc.
Ease of negotiation	Often fixed, little flexible	Negotiable based on performance and context

Compare the financial impact with the dedicated calculator

Now, here’s where it gets interesting. To truly weigh the pros and cons, you must make a precise calculation of what each option represents in money. For example, if your annual gross salary is 30 000 € and you are offered a 13th month equivalent to 1 500 €, that represents an immediate increase of 5%. On paper, that’s not nothing. But if you can negotiate a 3% increase each year, you can quickly surpass that bonus after two or three years.

And that’s where the calculator becomes your best ally. By including all variables (gross salary, net, social charges, benefits, bonus, etc.), you obtain a clear view of your purchasing power over time. You can thus see whether a regular increase far exceeds a one-off bonus or whether the change needs to happen over a few years to bear fruit.

A concrete example with the precise calculation

Suppose your gross salary is 35 000 € per year. With a calculator, you can simulate a 5% increase, which will represent about 1 750 € more per year, or about 146 € per month. If your employer offers a 13th month of 2 000 €, that amounts to 167 € per month over a year. The difference is that the bonus will not last, unless you manage to turn it into a regular benefit. In any case, this kind of simulation allows you to have a clear view of what will actually make you gain.

Optimize your negotiation: prepare your case with numerical data

Imagine you ask for your raise. The key is preparation, and above all, proof that you deserve the increase. You can use your salary benchmark to support your case. Between us, no one wants an employee who doesn’t know their value on the market. By mastering these numbers, you can argue with confidence and credibility.

For example, if you know that the average in your sector for your position is 40 000 €, you can make your request with precise figures and facts. And above all, don’t limit yourself to talking about gross salary. Include benefits, bonuses, and even your self-assessment to show why you are worth it.

A foolproof method to negotiate effectively

You also need to know your value and be able to estimate it. The technique is to be calm but firm. Prepare your argument, present your numbers, be attentive and remain flexible. If your goal is a significant increase, propose a compromise: for example, an immediate raise with a re-evaluation clause in six months. All of this shows that you master the situation and that you won’t be easily destabilized.

Mistakes to avoid so you don’t devalue your request

You might be crossing your fingers hoping your boss will understand on their own. Bad idea. Transparency and preparation are key. Also avoid basing your request solely on personal reasons or frustration. The negotiation must remain professional, quantified, and results-oriented. Otherwise, you risk coming across as an employee who doesn’t understand their own value.

Another classic pitfall is not preparing a precise number or insisting only on your personal need. Attention: you are not there to beg. You are there to negotiate your pay with solid facts and figures.

Strategies to handle your employer’s counter-arguments

Here is where everything is played out: the ability to convert a “we can’t do more this year” into an opportunity. When your boss invokes budgetary or economic constraints, don’t be discouraged. On the contrary, use these arguments to propose other forms of benefits: training, remote work, flexible hours, or exceptional bonuses.

And if your employer highlights numbers or financial difficulties, remind them of the positive impact that an adjusted compensation could have on your motivation and productivity. This can quickly turn the conversation into a win-win negotiation, for you as well as for them.

Example dialogue to move the discussion forward

– Me: “I am convinced that my contribution this year helped achieve our objectives. I would like us to consider a raise or additional benefits.”

– Boss: “Our finances are complicated this year…”

– You: “I understand, but if we look at the impact of a raise in my case, it could strengthen my motivation over the long term. Otherwise, maybe we can consider other forms of incentives.”

Now it’s up to you to tip the balance in your favor

The longer you wait, the more money you lose. The best strategy is to prepare yourself today. Analyze your numbers, master your argument, and above all, don’t let the opportunity to obtain better pay pass you by. Don’t forget that a well-negotiated little trick today can turn into a big benefit tomorrow.

And if you want to go even further in your approach, don’t hesitate to use our calculator to precisely quantify each scenario. It’s your secret weapon to negotiate with confidence, without being taken advantage of. Promise me one thing: never stay underpaid again, you can afford it.