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SUWANVARA LAWFIRM
Suwanvara Law Firm Co., Ltd.
SUWANVARA LAWFIRM
SUWANVARA LAWFIRM
Suwanvara Law Firm Co., Ltd.
Labor Law

Minimum Wage Increase: What Employers Need to Adjust Besides the Numbers on the Payslip

The minimum wage adjustment does not only affect the salary base, but also extends to overtime pay, holiday pay, social security contributions, and the calculation base upon termination. A checklist for employers who do not want to face retroactive claims.

by Legal Advisory TeamAugust 22, 20263 min read
Minimum Wage Increase: What Employers Need to Adjust Besides the Numbers on the Payslip

When the minimum wage rate adjustment is announced, what many companies do is change the figures in the payroll system for those who earn less than the new rate, and consider it done.

The fact is that wages are the calculation base for many other items. Adjusting the base therefore affects the entire system, and the items that are forgotten to be adjusted are often those that are later claimed retroactively.

Items that Adjust with the Wage Base

  • Overtime pay and holiday work pay, which are calculated from the hourly wage at the new rate
  • Pay for paid leave days, such as statutory sick leave and annual vacation leave
  • Social security contributions, which are calculated from wages under the prescribed ceiling
  • Calculation base upon termination, both payment in lieu of advance notice and severance pay based on years of service
  • Pay for unused vacation days upon termination of employment

The two most frequently forgotten items are the first two, because some payroll systems store the hourly rate as a separate fixed constant and do not automatically recalculate it from the salary base.

Checklist When There Is a Wage Rate Adjustment Announcement

  1. Check the rate for each area where the company has establishments — do not use a single figure for the whole company.
  2. Check the effective date and verify that any payroll period straddling that date has been correctly split and calculated.
  3. Check the hourly rate in the payroll system to confirm it has actually been recalculated, not left as a fixed preset value.
  4. Check daily-paid, piece-rate, and probationary employees to ensure that, when converted back, they are not lower than the new rate.
  5. Separate welfare benefits from wages — do not include meal or transportation allowances to reach the minimum rate.
  6. Post the notice of the new rate at the workplace so that employees are informed.
  7. Review the salary structure to see whether the gaps between levels are still reasonable.
  8. Keep evidence of the adjustment, including internal documents and the pay slips for the adjusted payroll period.

The rates and effective dates must be verified against the Wage Committee announcement currently in force. This article does not state specific figures because the rates change with each announcement and vary by area.

The risks that follow if you do not adjust

Paying below the minimum wage rate is not something that ends with an explanation. Employees can file a complaint with a labor inspector, and when an order to pay is issued, the employer must pay the difference retroactively — it is not a matter of starting to pay correctly from the date the violation was discovered.

What causes the amount to balloon is the knock-on effects, because when the wage base is adjusted retroactively, overtime pay and other items calculated from that base are also recalculated accordingly, and it may further affect social security contributions that were remitted lower than they should have been.

For businesses with tight labor costs

Reducing working hours, restructuring shifts, or reviewing benefits are viable options, but it must be considered whether they affect the existing terms of employment that employees currently enjoy, because changes that are unfavorable to employees without their consent are subject to legal restrictions.

What should not be done is terminating employees and rehiring them under new conditions in order to reset the terms of employment, because this approach can be challenged both on the grounds of continuous length of service and on the fairness of the termination.

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📌 See more: Labour cases · Business law

If you are called in for inspection by a labour inspector, or have been ordered to make back payments, consult a lawyer for free: call 092-254-2045


This article provides general information, not legal advice for specific cases. Minimum wage rates change by announcement; you should check the version in force in your area.

Frequently asked questions

Is the minimum wage rate the same nationwide?+

No, they are not the same. Minimum wage rates are set by announcements of the Wage Committee and vary by area. In some periods, additional rates are set by type of business or specific skills. Employers with branches in multiple provinces therefore need to look at the rate for each area, not use a single figure for the whole company, and must always check the latest announcement in force at that time.

Can an employee consent to receive below the minimum wage?+

No. The minimum wage is a law relating to public order. An agreement providing wages lower than the legal rate is unenforceable, even if the employee has signed consent. Upon inspection, the employer must pay the difference retroactively and may also be subject to legal penalties. The consent document kept on file is therefore of no help at all during consideration.

If payment is made by day or by piece, how should it be compared to the minimum?+

It must be shown that the wages the employee receives for work during normal working hours are not lower than the minimum rate. Payment based on output or piecework does not exempt this principle. Employers using a piece-rate system should therefore have a clear method of calculating and comparing the rate in the documents, and keep working time records, because when inspected, the burden of presenting evidence lies with the employer.

Can food, accommodation, and transportation allowances be counted as wages?+

It depends on whether the payment is made as remuneration for work during normal working hours. Benefits paid as assistance or under other conditions are generally not considered wages for legal calculation purposes. Including benefits to bring the figure up to the minimum is therefore a risky method, and it is an issue frequently detected when complaints are filed.

If the minimum wage increases, must those already earning above the minimum be adjusted too?+

The law only prohibits paying below the minimum rate; it does not require adjusting those who already earn above it. In practice, however, making no adjustment at all eliminates the gap between new and existing employees, which is a cause of labor relations problems in many organizations. If there is any agreement or practice that ties the salary structure to the minimum wage rate, that obligation must also be considered.

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