What is Corporate Income Tax? Calculation and Latest Finalization Regulations

With a frequently changing legal system, accurately understanding what corporate income tax is, who is liable to pay it, and how to calculate it optimally remains a challenge for many business owners and accountants. This article from 1Office will serve as a comprehensive guide, demystifying everything from the basic concepts to the most complex finalization steps according to current regulations.

1. What is corporate income tax?

Simply put, Corporate Income Tax (CIT) is a direct tax levied directly on a company’s taxable income after deducting all reasonable and valid expenses related to its production and business activities.

In other words, this is the amount of money that a business is obligated to contribute to the state budget based on its final business results (actual profit).

The role of this tax is not just limited to creating a significant source of revenue for the national budget. It is also an effective tool for the State to regulate the macro-economy. Through tax incentives or exemptions, the State can encourage capital investment into priority sectors (such as high technology, education, healthcare) or economically disadvantaged areas, while also contributing to a more equitable redistribution of social income.

2. Who is liable to pay corporate income tax?

According to the Law on CIT, the range of taxpayers is very broad, covering almost all organizations that generate profit. Specifically, these entities include:

• Enterprises established under Vietnamese law: Including joint-stock companies, limited liability companies (LLCs), private enterprises, partnerships, etc.
• Foreign enterprises: Whether or not they have a permanent establishment in Vietnam, if they generate income in Vietnam, they are subject to tax. For foreign enterprises with a permanent establishment in Vietnam (such as a branch, factory, or executive office), the tax liability includes both income generated in Vietnam and foreign income directly related to the activities of that establishment.
• Cooperative economic organizations: Established and operating under the Law on Cooperatives.
• Non-business units: Public and non-public non-business units that have income-generating production and business activities involving goods and services.
• Other organizations: Any other organization that has production or business activities generating taxable income.

3. The most accurate way to calculate corporate income tax

To accurately calculate the amount of tax payable, businesses must strictly follow the process of determining financial indicators.

3.1. General formula

The CIT payable for a tax period is determined by the following basic formula:

CIT payable = Assessable income * Tax rate

If a business has already paid income tax abroad, this amount can be deducted from the tax payable in Vietnam. However, the deduction amount cannot exceed the tax payable as stipulated by the domestic Law on CIT.

3.2. Steps to determine Assessable Income

This is the most complex step in the tax calculation process. “Assessable income” is not entirely the same as “Profit before tax” in accounting. To determine this figure correctly, businesses need to follow this sequence:

• Step 1: Determine taxable income

Formula:

Taxable income = (Revenue – Deductible expenses) + Other incomes

• Step 2: Determine assessable income

From the taxable income calculated in Step 1, the business continues to exclude preferential amounts:

Assessable income = Taxable income – (Tax-exempt income + Carried-forward losses)

Note: For specific income types such as from real estate or investment project transfers, businesses must account for and declare them separately. They cannot be offset against income from primary production and business activities (except in special cases as defined by law).

3.3. Differentiating between Revenue and Other Income

To apply the above formula accurately, accountants need to clearly distinguish between these two sources of income:

• Revenue for tax purposes: This is the total value from sales, processing, and service provision, including any subsidies and surcharges the business is entitled to. The time of revenue recognition is when ownership is transferred (for goods) or when the service is completed/invoiced (for services), regardless of whether payment has been received.
• Other income: These are incomes that do not come from the main business activities. This category includes: income from the transfer of capital, securities, or real estate; bank deposit interest; foreign exchange gains; gifts and presents; recovery of bad debts that were previously written off; and income omitted from previous years.

3.4. Deductible and non-deductible expenses

This is often a “hot spot” during tax audits. For an expense to be considered deductible when calculating CIT, it must simultaneously meet the following three “golden” conditions:

• The expense was actually incurred and is directly related to the company’s production and business activities.
• There are complete and legitimate invoices and supporting documents as required by law.
• For invoices for goods or services valued at 20 million VND or more (including VAT), there must be proof of non-cash payment (such as a payment order, bank transfer, etc.).

Conversely, any expense that fails to meet one of these conditions, or exceeds the standard consumption rates for materials, or is improperly incurred (such as administrative violation fines, expenses without a red invoice, etc.) will be disallowed by the tax authorities and considered a non-deductible expense. This will increase the taxable income and the amount of tax the business must pay.

4. Current CIT rates

Applying the correct corporate income tax rate is a key factor in determining financial obligations. Currently, the tax schedule is as follows:

• Standard tax rate of 20%: This is the rate applied to the vast majority of businesses operating in Vietnam that are not eligible for incentives or engaged in resource extraction.
• Tax rates from 32% to 50%: Applied to activities involving the exploitation of precious and rare resources. Specifically, this includes the prospecting, exploration, and extraction of oil, gas, and other rare resources in Vietnam, depending on the specific project and location.
• Preferential tax rates: To encourage investment, the State applies lower tax rates for certain sectors and special areas:
  • 10% incentive: Often applied for 15 years or for the entire duration of the project for high-tech enterprises, projects in areas with extremely difficult socio-economic conditions, or socialized sectors such as education, healthcare, culture, environment, social housing, etc.
  • 17% incentive: Often applied for 10 years for investment projects in areas with difficult socio-economic conditions, or projects producing high-grade steel, energy-saving products, etc.

Reference the current standard tax rates

5. CIT-exempt incomes

To optimize their tax liability, businesses cannot overlook the list of tax-exempt incomes. Current law specifies about 11 types of exempt income, with the most notable being:

• Income from cultivation, animal husbandry, aquaculture, and processing of agricultural and aquatic products by cooperatives; or by enterprises operating in areas with extremely difficult socio-economic conditions.
• Income from providing technical services that directly serve agriculture.
• Income from the execution of scientific research and technological development contracts.
• Income of enterprises producing and trading goods and services exclusively for employees who are people with disabilities, post-rehabilitation individuals, or HIV-infected individuals (provided that the number of such employees accounts for 30% or more of the average total workforce during the year).
• Income from vocational training activities exclusively for ethnic minorities, people with disabilities, children in special difficult circumstances, and individuals affected by social evils.
• Income received from capital contributions, share purchases, joint ventures, or economic associations with domestic enterprises, after the recipient of the capital contribution has fully paid CIT (commonly known as dividends).

6. Deadlines for CIT declaration and payment

Adhering to tax declaration and payment deadlines helps businesses avoid unnecessary late payment penalties. Current regulations have been significantly simplified to facilitate taxpayers.

• Quarterly provisional payment: Currently, businesses are not required to submit quarterly provisional corporate income tax (CIT) declarations. Instead, based on actual business results, businesses self-determine the provisional tax amount and pay it to the state budget. The payment deadline is the 30th day of the first month of the following quarter.
  • For example: The provisional CIT payment deadline for Q1 is April 30th; for Q2 is July 30th…
• Annual finalization: This is the most important declaration period.
  • For businesses whose fiscal year coincides with the calendar year: The deadline for submitting the finalization dossier and paying any remaining tax (if any) is the last day of the third month from the end of the calendar year (usually March 31st of the following year).
  • For businesses with a fiscal year different from the calendar year: The deadline is the last day of the third month from the end of that fiscal year.

7. Tax Finalization Dossier and Procedures

CIT finalization is the procedure of summarizing a business’s entire tax liability for the year. To carry out this procedure, businesses need to prepare a complete and accurate dossier.

7.1. Dossier Components

A standard CIT finalization dossier includes:

• CIT finalization declaration form: Use Form 03/TNDN issued with Circular 80/2021/TT-BTC.
• Annual financial statements: A complete set of reports includes the Balance Sheet, Income Statement, Cash Flow Statement, and Notes to the Financial Statements.
• Accompanying appendices: Depending on the specific nature of operations (such as related-party transactions, tax incentives, loss carry-forwards…), businesses need to submit corresponding appendices.
• Power of attorney: In cases where the legal representative does not directly sign the dossier but authorizes another person to do so.

7.2. Dossier Submission Procedures

Currently, tax authorities encourage and prioritize online dossier submission. Businesses can choose one of the following methods:

• Online submission (Most common): Use a digital signature to submit the dossier through the General Department of Taxation’s electronic portal at thuedientu.gdt.gov.vn. This is a fast, cost-effective method adopted by the vast majority of businesses.
• In-person submission: Submit a hard copy of the dossier at the “One-Stop” department of the managing tax authority.
• Submission by post: Send the dossier via registered mail to the tax authority’s address.

8. Conclusion

Understanding what corporate income tax is and mastering the regulations on its calculation and declaration is a solid foundation for the sustainable development of any business. We hope this article from 1Office has provided you with a comprehensive overview and the most practical guidance for effective tax management in this fiscal year.