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Calculate monthly VAT SME

Calculate the VAT that must be submitted to the Revenue Department monthly. Output VAT minus Input VAT for SME entrepreneurs.

taxVerifiable formulaYou can save and share results.
Calculate VAT 7%Add VAT or exclude VAT from the total price.Calculate multiple VATMulti-line tax invoice with summariesCalculate profit and lossCalculate net profit for SME businessesSubtract VAT from the total price, formula 1.07Separate the amount before VAT and the tax amount.VAT 7% How do you think about the formula for adding tax?Formula for adding/subtracting VAT to set selling prices

For businesses registered with VAT

Data is not saved. and is used for calculation only.

VAT 7% update year 2026

Monthly VAT SME Calculator

The Monthly VAT SME Calculator estimates a tax and statutory rate estimate for your scenario from the quantities, rates, period, units and other assumptions requested on the page. Replace the example values with your own monthly vat sme figures and recalculate after changing an assumption. Treat it as a planning estimate and independently verify the current rule or provider terms.

Calculate the VAT that must be remitted to the Revenue Department each month. Output VAT (VAT on sales) minus Input VAT (VAT on purchases) = VAT that must be remitted.

Enter sales VAT and purchase VAT amounts.

Output VAT — VAT charged to customers.

Enter either Sales or Output VAT.

Input VAT — VAT paid when purchasing goods/services.

Value Added Tax (VAT) for SMEs

Entrepreneurs registered with VAT must submit the P. P.30 form every month, whether they have income or not. Calculation formula: VAT that must be remitted = Output VAT − Input VAT − Credit VAT quoted

Deadline for submitting and paying VAT

  • Submit paper form: within 15 of next month
  • Submit online via e-Filing: within 23 of next month
  • Late filing penalty: 2% of tax per month (minimum 200 baht)
  • Additional money in case of late payment: 1.5% per month of outstanding tax.

Frequently asked questions

When do SMEs need to register for VAT?
Businesses with income from sales of goods/services exceeding 1.8 million baht per year must register for VAT within 30 days from the date the income exceeds the threshold.
What are Output VAT and Input VAT?
Output VAT is VAT that is collected from customers (Sales VAT). Input VAT is VAT that is paid to suppliers when purchasing goods/services (Purchases VAT). VAT that is remitted to the Revenue Department = Output VAT - Input VAT.
When must I submit VAT?
Must submit P. P. form 30 every month by date 15 of the following month. (For online submission, expand to 23 of the month) Even if there is no sales, you must submit a blank form.
Input VAT is more than Output VAT. What can I do?
If Input VAT > Output VAT, there are two options: (1) Request a VAT refund from the Revenue Department (2) Keep it as Credit VAT to deduct in the next month. Most businesses choose to collect as credit for convenience.
What is the late VAT filing penalty?
Late filing penalty 2% of tax due per month (minimum 200 baht) plus an additional 1.5% per month of overdue tax
What size business must register for VAT?
Entrepreneurs whose income from selling products or services exceeds 1,800,000 baht per year must register for VAT within 30 days from the date their income exceeds.
What are VAT Input and Output Tax?
Output VAT: Tax collected from customers | Input VAT: Tax paid to suppliers | Tax that must be remitted to the Revenue Department = Output VAT - Input VAT. If negative, receive a refund or credit the next month.
What products and services are exempt from VAT?
Fresh food, unprocessed fruits and vegetables, live animals, fertilizers and insecticides, newspapers/magazines, health/education services, domestic passenger transportation

Official reference source

Learn more from our article.

📖
Subtract VAT from the total price, formula 1.07Separate the amount before VAT and the tax amount.
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VAT 7% How do you think about the formula for adding tax?Formula for adding/subtracting VAT to set selling prices
Check before using results

Summary before using this number

The calculated results are estimates for tax or expense planning. Before actually submitting, you should check the latest rates and conditions from the official agency.

  • Calculated based on the information you enter and the rate specified on the tool page.
  • Special cases may require additional evidence or conditions.
  • The final numbers may change according to actual documents and government agency announcements.
Revenue DepartmentCalculation method and references
Select continue from this result.
Calculate VAT 7%Add VAT or exclude VAT from the total price.Calculate multiple VATMulti-line tax invoice with summariesCalculate profit and lossCalculate net profit for SME businesses

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Disclaimer: Calculation results are only estimates. It is not considered tax advice. Please consult an expert or accountant for actual VAT submission.

English calculator guide

How to use the Monthly VAT SME Calculator

Use this page to test a specific monthly vat sme 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 monthly vat sme estimate instead of relying on a generic example.

  1. Build a baseline monthly vat sme case with figures that match your situation.
  2. Run a second monthly vat sme case after changing the rate, period, quantity or other key assumption.
  3. Record the difference between the two monthly vat sme results and the input responsible for it.

Inputs for the monthly vat sme estimate

For this monthly vat sme calculation, check the quantities, rates, period, units and other assumptions requested on the page. The result is designed to show a tax and statutory rate estimate for your scenario, not a guaranteed provider price or official decision.

How the monthly vat sme result is calculated

The calculator applies the displayed statutory rates, thresholds and allowances to the figures you enter. Reusing the same monthly vat sme inputs will produce the same estimate, which makes the page suitable for controlled scenario comparisons.

Checks for a monthly vat sme decision

Confirm any current rate, threshold or provider rule that could change the final amount. For monthly vat sme, Treat the result as an estimate for planning. Tax rules, eligibility and deduction limits can depend on the tax year and your evidence, so compare the result with current Revenue Department guidance or a qualified adviser. 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
Calculator scope
Tax and statutory rate
Last English review
26 July 2026

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