How to Calculate Tet Bonuses with ChatGPT: Understand Correctly to Avoid Losing Your Year-End Benefits

1. Is Tet Bonus Mandatory?

Tet bonuses have long become a familiar “custom” at the end of the year, leading many to assume it is an automatic entitlement after working a full 12 months. However, from a legal perspective, Tet bonuses are not a mandatory obligation that companies must pay in all cases. According to Article 104 of the 2019 Labor Code, bonuses are money, assets, or other forms decided by the employer based on business performance and the employee’s work results. In other words, this is an incentive and recognition policy, not a compulsory payment like salary or legally required allowances.

This means companies have the right to decide whether to give bonuses, how much, and in what form, as long as it aligns with internal regulations or agreements stated in labor contracts or collective labor agreements. In many companies, bonus levels may be tied to business performance, individual KPIs, actual working time, or level of contribution during the year. Therefore, even in the same Tet period, each company may have different calculation methods and bonus levels, with no universal formula applicable to all.

However, having discretion does not mean acting arbitrarily. Once a company has issued and publicly announced its bonus policy, it becomes an internal commitment that must be implemented seriously. Changes, reductions, or failure to pay contrary to announced policies may lead to disputes and affect corporate reputation. Therefore, employees should proactively learn about the bonus policies at their workplace, while companies should ensure transparency and clarity to maintain fairness and trust.

2. What Is the Difference Between Tet Bonus and 13th-Month Salary?

Many people casually assume that “Tet bonus is the same as the 13th-month salary,” but in reality, these are two different concepts in both nature and application basis. The 13th-month salary is usually considered a stable additional income, clearly stated in labor contracts, collective agreements, or company compensation policies. Once agreed upon in writing, it is essentially part of the salary, and the company is responsible for fulfilling it, similar to the obligation of monthly salary payments.

Meanwhile, Tet bonuses are incentive-based and serve as recognition of year-end performance. This amount depends on business results, employee performance, and each company’s specific policy. There is no regulation requiring all companies to pay Tet bonuses, nor is there a fixed amount. Therefore, Tet bonuses may be higher, lower, or even nonexistent, depending on the employer’s situation.

In practice, some companies combine the 13th-month salary and Tet bonus into a single payment at year-end, causing confusion. However, if the company clearly distinguishes them in contracts and internal policies, you should understand that receiving both is not automatic. Each policy depends on specific agreements, so carefully reviewing contracts and company regulations is the best way to protect your rights.

3. How Companies Calculate Tet Bonuses

Although the law does not provide a fixed formula for calculating Tet bonuses, in practice many companies build calculation mechanisms based on clear and measurable criteria. The most common factors include job performance (KPI, productivity, year-end evaluation), seniority, average salary during the year, and company profit or revenue. These factors make bonus distribution more transparent and motivate employees to perform consistently throughout the year.

A commonly used reference formula is:

Tet Bonus = (Performance Bonus Rate + Seniority Rate) × Average Monthly Salary

For example, if your performance rating is 90%, you have 2 years of seniority, and the company sets the corresponding bonus at 120% of salary, while your average salary is 15 million VND/month, the bonus may be calculated as follows:

Tet Bonus = 1.2 × 15,000,000 = 18,000,000 VND

This shows that Tet bonuses reflect not only salary but also work performance and tenure.

However, note that this is only an illustrative example. In reality, each company has its own policy depending on size, industry, financial capacity, and corporate culture. Some use fixed coefficients, others divide by ranking levels A – B – C, and some tie bonuses entirely to year-end business results. Therefore, to know exactly how much you will receive, you must rely on your company’s specific bonus policy rather than applying a generic formula.

4. Guide to Using ChatGPT to Calculate and Verify Bonuses

4.1 Step 1: Prepare Complete Data Before Entering into ChatGPT

Before asking ChatGPT to calculate Tet bonuses or the 13th-month salary, you need to compile accurate information to avoid errors. Important data include: average salary over 12 months (or actual working months), KPI completion rate, working time during the year, bonus coefficients according to company policy, and terms stated in the labor contract. If your company applies ranking systems (A – B – C) or profit-based percentages, you should also prepare the corresponding conversion rates.

Preparing complete data not only helps ChatGPT calculate more accurately but also allows you to review your own benefits. Many employees miscalculate because they forget to exclude unpaid leave, maternity leave, or confuse base salary with actual income. Clear input leads to reliable output for comparison with HR results.

4.2 Step 2: Enter Clear and Specific Calculation Requests

Once you have sufficient data, you need to give clear and specific instructions so ChatGPT understands correctly. For example: “Calculate Tet bonus using the formula: Bonus = 1.2 × average salary. Average salary is 15 million/month, worked 10 months.” Or if multiple factors apply: “Bonus = (KPI rate 90% + seniority 10%) × average salary 14 million. Worked full 12 months.” The more detailed the input, the more accurate the result.

Besides providing final results, you can ask ChatGPT to show step-by-step calculations for easier verification. This is especially useful when bonuses involve multiple coefficients or prorated time. With a clear breakdown, you can easily compare with company announcements and detect errors if any.

4.3 Step 3: Request Analysis of Special Cases to Confirm Benefits

Not everyone works a full 12 months or achieves 100% performance, so you can use ChatGPT to analyze special cases such as resigning before Tet, working less than a year, job transfers mid-year, or reduced KPI. Simply describe your situation clearly and include relevant policy excerpts (without sharing sensitive personal data), and ChatGPT will recalculate proportionally and indicate how the company may apply the policy.

This step is crucial because many people lose benefits due to misunderstanding prorated calculations. With clear analysis, you will have logical reasoning and concrete numbers to discuss with HR. Being proactive in calculation and verification helps you understand your income and protect your year-end benefits more professionally.

5. If You Work Half a Year, Will You Receive a Tet Bonus?

Whether working 6 months qualifies for a Tet bonus is a common question, especially for those who changed jobs during the year. In reality, the law does not require a full 12 months to receive a bonus, since Tet bonuses are not mandatory but depend on company policy. The key factor is not how long you worked, but the internal bonus policy and terms stated in your labor contract.

There are two factors to consider: whether the company applies prorated bonuses based on working time, and whether you belong to the eligible group (e.g., official employees, completed probation, no disciplinary violations). If the policy clearly states that employees working less than 12 months receive proportional bonuses, you have a valid basis to receive a corresponding amount.

In practice, many companies apply flexible calculations, such as 6 months equaling 50% of a full-year bonus, or providing a fixed support amount. Therefore, even if you did not work the full year, you should proactively ask HR about applicable policies to avoid missing deserved benefits.

6. If You Resign Close to Tet, Will You Still Receive the Bonus?

This is a concern for many considering job changes at year-end. In principle, if the Tet bonus is clearly stated in labor contracts, collective agreements, or publicly announced policies, it is considered a commitment between employer and employee. In such cases, even if you resign before payment but still meet eligibility conditions, the company must fulfill its commitment.

However, if the policy specifies that bonuses apply only to employees still working at the time of payment, the company has the right not to pay those who have left. Therefore, before resigning close to Tet, you should carefully review contracts and policies to avoid losing significant income.

7. Are Probationary Employees Eligible for Tet Bonuses?

Current law does not require companies to give Tet bonuses to employees in probation. Therefore, eligibility depends entirely on company policy. Most companies apply bonuses only to official employees, as they are considered stable and long-term staff.

However, in practice, some companies still offer small gifts or support to probationary employees, such as in-kind Tet gifts, symbolic cash, or commitments to include them if they become official before payment. Although not large, these gestures reflect positive corporate culture. If you are on probation at year-end, you can proactively inquire about policies to know your eligibility.

8. Are Tet Bonuses Subject to Personal Income Tax?

According to Circular 111/2013/TT-BTC, bonuses in cash or in-kind received from employers are included in taxable personal income if total monthly or annual income exceeds the tax-free threshold. This means Tet bonuses are not tax-exempt. When combined with salary and other income, if exceeding the threshold, you must pay tax based on progressive rates.

Therefore, when receiving a large bonus, the actual amount received may be lower than announced due to tax deductions. This is completely normal under the law. To avoid surprises, you should review payslips, deductions, and tax calculations, especially during months with high income like year-end.

9. Is Tet Bonus Included in Social Insurance Salary?

According to Circular 59/2015/TT-BLĐTBXH, Tet bonuses are not included in the salary used as a basis for social insurance contributions, unless explicitly stated in the labor contract as fixed monthly income. In other words, Tet bonuses are welfare or incentive payments, not regular salary for mandatory insurance contributions.

This means when you receive a Tet bonus, the company does not need to contribute social insurance, health insurance, or unemployment insurance on that amount, and you will not have deductions either. This is an important distinction between salary and bonus.

10. Conclusion

Tet bonuses are not just financial rewards but also recognition of a year of work and motivation for a positive start to the new year. By understanding the legal basis, payment principles, and calculation methods, you can avoid confusion or losing benefits due to lack of information. Using ChatGPT proactively as a tool to calculate, verify contracts, check working ratios, and analyze resignation scenarios helps you have clear grounds when discussing with employers. Year-end is not only a time to review work but also personal benefits—understanding clearly ensures you value your labor and prepare for a more complete and secure Tet.