Full pay x (actual working days ÷ working days in month)
It's good for new employees who want to know their first month's pay.
Salary During Probation Calculator
The Salary During Probation Calculator estimates an income, tax or statutory-cost estimate for the figures entered from the income, employment or business status, relevant period, allowances and current thresholds shown on the page. Replace the example values with your own salary during probation figures and recalculate after changing an assumption. Treat it as a planning estimate and independently verify the current rule or provider terms.
Enter the salary, the start date and the working days in the month. The system will calculate the salary for the first month pro-rata.
Calculation results
First month's salary (pro-rata)
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Full month's pay.
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Partition
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Actual working days ÷ working days for the whole month-
Formulas used
Pro-rata salary = trial salary × (actual working days ÷ working days per month)
If there's no extra salary for the trial, full salary is used.
Salary and wages are calculated from the data entered, used for planning and preliminary checks before comparing with slips or documents from the employer.
Use tax base, social security, and standard terms of the tool.
Excluding benefits or company-specific agreements.
In case of dispute, check the employment documents and the latest labor laws.
How does the first month's pay count if I start mid-month?
First month's pay = full pay x (actual working days ÷ working days in that month) which is called pro-rata.
How many months of trial?
Labor law does not specify the trial period, but generally it is 90 days (3 months) or 120 days. Some companies may specify 6 months.
Did you get social security during your trial?
All employees with incomes must pay social security contributions from the first day of employment, and employers must register within 30 days.
If the trial pay is lower than normal, do you have to tell the staff?
It must be specified in the employment contract and must not be less than the statutory minimum wage.
What is the minimum wage for the year 2026?
The minimum wage in 2025-2026 in Bangkok and surrounding areas is 370-400 baht/day, in the provinces is 330-370 baht/day depending on the province. Check the latest rate from the Ministry of Labour mol. go. th
What is the net salary calculated from?
Net salary = Total salary - Tax deducted at place of payment - Social security contributions (5% maximum 875 baht) - Subsistence reserve fund (if any) Employer pays additional social security to the other party 5%
How does OT count?
Regular days: 1.5 times the normal hourly wage | Holidays: 2 times (regular hours) and 3 times (overtime) | Under the Labour Protection Act 1998
What's the benefit of a life insurance fund?
Long-term savings that employers contribute (1-15% of wages) + maximum tax deduction 15% of income or 500,000 baht + return on investment withdrawable when leaving work or retirement
Disclaimer: The results are estimates, the actual pay depends on company policies and employment contracts.
English calculator guide
How to use the Salary During Probation Calculator
Use this page to test a specific salary during probation scenario. Enter your own values in the calculator above, review the units beside each field, and recalculate after changing an assumption. The result updates the salary during probation estimate instead of relying on a generic example.
Build a baseline salary during probation case with figures that match your situation.
Run a second salary during probation case after changing the rate, period, quantity or other key assumption.
Record the difference between the two salary during probation results and the input responsible for it.
Inputs for the salary during probation estimate
For this salary during probation calculation, check the income, employment or business status, relevant period, allowances and current thresholds shown on the page. The result is designed to show an income, tax or statutory-cost estimate for the figures entered, not a guaranteed provider price or official decision.
How the salary during probation result is calculated
The calculator applies the displayed pay period, rate, deduction and statutory assumptions to the employment figures entered. Reusing the same salary during probation inputs will produce the same estimate, which makes the page suitable for controlled scenario comparisons.
Checks for a salary during probation decision
Check the effective date and confirm current rules with the relevant Thai authority or a qualified adviser. For salary during probation, Use the result to reconcile a payslip or plan take-home pay. Employer payroll rules, benefits, withholding and statutory contributions can change the final amount. Because this calculation can affect an important financial, legal or health decision, independently verify the inputs and current rules before relying on the result.
Language QA
Terminology, numeric values and calculator controls checked
Review formula structure, test cases, data sources, effective dates, and risk language accordingly.How to check our · There is no claim that an outside professional reviewed it. Unless the page directly states the name and qualifications. This content is therefore not individual advice.
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