Guidelines for filing corporate income tax returns.

The corporate income tax return is the most important legal obligation that all business entities in Vietnam must fulfill at the end of the fiscal year. According to regulations... Tax Administration Law No. 38/2019/QH14, Businesses are responsible for calculating, declaring, and being accountable for the data they provide. corporate income tax (CIT) arises during the tax period.

Preparing a corporate income tax return is not simply a matter of filling in numbers. Form 03/TNDN. This is a process of reviewing all reasonable revenue and expenses based on Circular 78/2014/TT-BTC and Circular 96/2015/TT-BTC. A small error in classifying non-deductible expenses can lead to significant risks of back taxes and late payment penalties from the tax authorities.

The importance of corporate income tax return reporting in risk management.

Report corporate income tax settlement This report reflects a company's compliance with the law and its financial health in relation to the state budget. When preparing this report, accountants need to accurately determine taxable income after adjusting for differences between accounting profit and taxable income.

Below is a table summarizing common practices that lead to discrepancies in corporate income tax returns, which tax audit teams often focus on:

Table of common practices leading to discrepancies in corporate income tax returns.

STT	Common misconduct	Impact on the report	Legal reference
1	Accounting for expenses without invoices or supporting documents.	Inflating expenses to reduce taxes payable.	Clause 1, Article 6 of Circular 78/2014/TT-BTC
2	Depreciation is being applied faster than prescribed.	Deductible expense discrepancies during the period	Circular 45/2013/TT-BTC
3	Excess interest expenses are not excluded.	Violation of thin capitalization ratio (for related-party transactions)	Decree 132/2020/ND-CP
4	Recording revenue at the wrong time.	Tax period discrepancies	Article 5 of Circular 78/2014/TT-BTC

Deadline for submitting corporate income tax return 

Based on Point a, Clause 2, Article 44 of the 2019 Tax Administration Law, businesses must submit their corporate income tax final settlement documents no later than the last day of the third month after the end of the fiscal year or calendar year. This applies to the annual tax settlement period. 2025 (December 31, 2025) deadline for submission corporate income tax return usually 31/03/2026, except in cases where the business adopts a different fiscal year as prescribed.

The entities required to prepare corporate income tax final settlement reports are:

All organizations engaged in the production and business of goods and services with taxable income as prescribed by law must submit corporate income tax return reports. Even businesses enjoying tax incentives or exemptions, or those currently operating at a loss, are not exempt from the responsibility to submit this return.

Standard structure for corporate income tax return filing

For the application to be accepted, the accountant needs to prepare all the components listed below. The absence of any appendix may result in the corporate income tax return being deemed invalid during an audit.

Corporate income tax finalization declaration (Form 03/TNDN)

This is a summary declaration form, crystallizing all data from appendices and accounting books. On this form, the enterprise must clearly show item [A1] – Total accounting profit before tax and the adjustment items from [B1] to [B15].

Annual financial report

Financial statements are an inseparable part of the corporate income tax return. The data on the balance sheet and income statement serves as the basis for tax authorities to verify the accuracy of the figures on the tax return.

Common accompanying appendices

Depending on the specifics of their business, enterprises may need to submit additional important appendices. The most common are Appendix 03-1A/TNDN on business results and Appendix 03-2A/TNDN on loss carryforward from previous years. If there are related parties, enterprises are required to submit appendices according to Decree 132.

Detailed steps for preparing the corporate income tax return.

The process of preparing corporate income tax final settlement reports needs to be carried out sequentially and with thorough cross-checking.

Step 1: Collect and check invoices and supporting documents.

Before compiling the figures, accountants must ensure that all input invoices are valid and legal. Invoices exceeding 20 million VND must have non-cash payment documentation as stipulated in Circular 173/2016/TT-BTC.

Step 2: Determine taxable revenue for corporate income tax purposes.

Revenue used to calculate corporate income tax returns includes money from sales, processing, and provision of services. This applies to businesses that file tax returns. VAT After deduction, the taxable revenue is the price excluding value-added tax.

Step 3: Classify deductible and non-deductible expenses.

This is the most complex part of preparing the corporate income tax return. Accountants need to filter out expenses that do not correspond to revenue or lack sufficient supporting documentation as required by current tax laws.

Common non-deductible expense categories

Commonly disallowed expenses include salaries without employment contracts or fines for administrative violations. Additionally, interest expenses corresponding to the shortfall in registered capital are also a key target for audit.

How to process the declaration form

These non-deductible expenses will be added back to taxable income. The accountant makes the adjustment through item [B4] on the corporate income tax return to recalculate the actual tax amount.

Step 4: Calculate the corporate income tax payable and complete the tax return.

After taxing income is generated, businesses apply the tax rate (usually 20%) to determine the amount of tax payable. Don't forget to subtract the provisional tax payments for the four quarters to determine the remaining tax payable on the final corporate income tax return.

Notes on expenses in the corporate income tax return.

The accuracy of corporate income tax returns depends heavily on how businesses handle estimated expenses.

The issue of provisioning

Circular 48/2019/TT-BTC stipulates very strict regulations on the establishment of provisions. If a business makes incorrect provisions for the wrong subjects or at the wrong rates, the tax authorities will immediately adjust the income on the corporate income tax return to reflect an upward shift in income.

Employee benefits costs

Businesses are allowed to deduct direct employee welfare expenses if they have invoices. However, the total amount of these expenses must not exceed one month's average actual salary paid during the tax year of the business.

Related-party transactions and transfer pricing risk

For corporations, the corporate income tax return must include a declaration of related-party transactions. Determining transaction prices according to market principles is mandatory to avoid the risk of being overcharged by the authorities.

Common mistakes when filing corporate income tax returns.

Many accountants often make professional errors that lead to businesses being heavily penalized with back taxes after audits.

Forget to carry forward losses from previous years.

If a business has incurred losses from previous years within the last 5 years, it must declare them in Appendix 03-2A. Omission will result in a higher tax liability on the corporate income tax return, causing financial losses.

Errors in determining tax incentives

Businesses in disadvantaged areas or specialized sectors often enjoy preferential tax rates. Incorrectly applying the tax exemption period or the wrong type of preferential income is a very common error when preparing corporate income tax returns.

No reconciliation between tax returns and ledgers.

A discrepancy between the ledger account 821 and the tax amount on the corporate income tax return is a sign of risk. Accountants need to prepare an explanation of the discrepancy to deal with future audits.

Summary of key indicators on Form 03/TNDN

Accountants need to understand the meaning of the following indicators to best control the quality of corporate income tax return reports:

Summary of key indicators on Form 03/TNDN

Indicator code	Indicator name	Operational significance
[A1]	Total profit before tax	Taken from the Income Statement
[B4]	Non-deductible expenses	Accounting expenses are recognized but tax-deducted.
[C1]	Taxable income	Summary of profit and adjustments
[C3]	Tax-exempt income	Tax-exempt items as defined by law.
[C4]	Losses carried forward during the period	Losses carried over from the previous year are used for offsetting.
[E1]	Corporate income tax payable	The tax amount is calculated according to the applicable tax rate (usually 20%).

The role of professional services in tax settlement

In the digital age, managing data for corporate income tax return preparation has become more convenient thanks to software. However, the professional mindset of the person performing the task remains the core element in ensuring tax compliance.

Many businesses now choose to outsource their corporate income tax return reporting to ensure objectivity, timely updates on new policies, and minimize the risk of administrative penalties.

For large businesses, corporate income tax returns are often accompanied by audit reports. This helps enhance financial credibility with banks, partners, and government regulatory agencies.

Conclude

The corporate income tax return serves as the final safeguard in the accounting process of each fiscal year. Proper preparation of this report helps businesses comply with the law and optimize their financial structure for sustainable future growth.

If your business is struggling with data processing or concerned about risks in corporate income tax reporting, contact MAN – Master Accountant Network. We provide comprehensive auditing services., tax accounting, tax consulting services, as well as tax settlement and tax reporting Professional. MAN is committed to supporting businesses in achieving financial transparency and optimizing tax obligations in accordance with the law.

Service contact information at MAN – Master Accountant Network

• Address: No. 19A, Street 43, Tan Thuan Ward, Ho Chi Minh City
• Mobile/Zalo: 0903 963 163 – 0903 428 622
• Email: man@man.net.vn

Content production by: Mr. Le Hoang Tuyen – Founder & CEO MAN – Master Accountant Network, Vietnamese CPA Auditor with over 30 years of experience in Accounting, Auditing and Financial Consulting.

Frequently Asked Questions about Corporate Income Tax Final Settlement Reports

Do businesses that generate no revenue have to file corporate income tax returns?

According to current regulations, all registered and operating businesses must submit annual corporate income tax returns, even if they have no revenue generated during the period.

What is the penalty for late submission of corporate income tax returns?

According to Decree 125/2020/ND-CP, the penalty for late submission of tax declarations ranges from 2 million VND to 25 million VND, depending on the number of days overdue and whether or not there is any tax payable.

Is it possible to resubmit the corporate income tax return if errors are discovered?

Taxpayers are allowed to file supplementary returns for their corporate income tax return at any time before the tax authorities announce a decision to conduct an inspection at the company's premises.

What is the current standard tax rate applied to corporate income tax returns?

Since 2016, the general corporate income tax rate applied to most Vietnamese businesses has been 20 percent, except for special cases related to the exploitation of rare resources.

What is the maximum amount of interest expense that can be deducted when preparing a corporate income tax return?

For businesses with related-party transactions, the total deductible interest expense shall not exceed 30 percent of the total net profit from business operations plus interest expense and depreciation expense for the period.