Vietnam Social Insurance Salary Base: How It’s Calculated

For companies hiring in Vietnam, calculating social insurance contributions starts with a key question: which salary components should be included in the calculation?

The answer is not always the same as an employee’s gross pay, take-home pay or the basic salary shown in an internal payroll system.

Under Vietnam’s Law on Social Insurance No. 41/2024/QH15 and Decree No. 158/2025/ND-CP, the contribution salary base is determined by specific legal criteria.

Here is what foreign employers should understand.

1. What Makes Up the Contribution Salary Base?

For employees whose salaries are determined by their employers, Article 7 of Decree No. 158/2025/ND-CP identifies three main components:

• Job or position salary: The monthly salary agreed upon in the employment contract, based on the employer’s salary scale and salary structure.
• Qualifying salary allowances: Allowances that meet the legal criteria, including those intended to compensate for working conditions, job complexity, living conditions or labor attraction.
• Certain additional payments: Other amounts agreed upon in the employment contract that are specifically determined and paid regularly and consistently in each pay period, subject to the applicable rules.

2. Why the Salary Figure in Payroll May Not Be Enough

A payroll system may display several different figures, including basic salary, gross pay and the salary used to calculate social insurance contributions.

These figures serve different purposes and should not automatically be treated as interchangeable.

For example, if an employee receives an agreed job salary and an additional payment, the employer needs to assess the additional payment under the applicable legal criteria before determining the contribution base.

The key is to follow the legal definition, not simply the label assigned to a payment.

3. A Practical Way to Review the Calculation

Employers can trace the calculation through three steps:

Step 1 — Check the agreed salary terms

Review the employment contract to identify the job or position salary and relevant additional compensation terms.

Step 2 — Assess the components

Determine which components meet the criteria under Article 7 of Decree No. 158/2025/ND-CP. Do not assume that every payment is included or excluded based only on its name.

Step 3 — Trace the figure used in payroll

Check that the salary base used for social insurance calculations can be explained by reference to the agreed compensation terms and the applicable legal rules.

If the records do not explain how the figure was determined, the discrepancy should be reviewed rather than carried forward automatically.

4. What Should Foreign Employers Keep in Mind?

When setting up payroll in Vietnam, foreign companies should avoid transferring salary classifications from another country without checking how Vietnamese rules apply.

Keep these distinctions in mind:

• The contribution salary base is not necessarily the same as gross pay or take-home pay.
• The treatment of a payment depends on the relevant legal criteria, not just its label.
• The salary base is only one part of the calculation. Employee eligibility, applicable contribution rates and statutory limits must be assessed separately.

A clear and consistent method helps the payroll team explain how the contribution figure was determined and review it when compensation arrangements change.

The Key Takeaway

Before applying a social insurance contribution rate, employers need to establish the correct salary base.

Vietnam’s Law on Social Insurance No. 41/2024/QH15 and Article 7 of Decree No. 158/2025/ND-CP provide the legal framework for that assessment. The specific treatment depends on the applicable rules and the employee’s circumstances.

Official References
Law No. 41/2024/QH15 on Social Insurance — Government of Vietnam
Decree No. 158/2025/ND-CP — Full text, Government of Vietnam (vanban.chinhphu.vn)

This article is provided for general informational purposes only and does not constitute legal advice.

Published: October 2026