Corporate - Tax administration

Last reviewed - 15 February 2024

Taxable period

The standard tax year is the calendar year. However, different accounting year-ends can be used if approval is obtained from the authorities.

Tax returns

The annual final CIT return and the audited financial statements must be filed no later than the last day of the third month as of the ending date of a calendar year or a financial year.

Payment of tax

Enterprises are required to make quarterly provisional CIT payments (no later than the 30th day of the next quarter) based on the quarterly business results. The total provisional CIT payment of 4 quarters of a tax year must not be less than 80% (“80% rule”) of the total CIT liability for the year. Any shortfall will be subject to late payment interest, counting from the deadline for payment of the quarter 4 provisional CIT liability. 

Final payment of CIT is due with the final CIT return (i.e. the last day of the third month as of the ending date of a calendar year or a financial year).


There are detailed regulations setting out penalties for various tax offences. These range from relatively minor administrative penalties to tax penalties amounting to various multiples of the additional tax assessed.

In practice, imposition of penalties has been arbitrary and inconsistent. However, in recent periods there has been a much tougher stance adopted by the tax authorities. Hence, where tax is paid late (e.g. as a result of a tax audit investigation), there is a significant likelihood of penalties being imposed.

Tax audit process

Tax audits are carried out regularly and often cover a number of tax years. Prior to an audit, the tax authorities send the taxpayer a written notice specifying the timing and scope of the audit inspection.

Statute of limitations

The general statute of limitations for imposing tax is ten years and for penalties is five years. Where the taxpayer does not register for tax or commits evasion liable to criminal prosecution, the tax authorities can collect unpaid tax and penalties at any time.

Topics of focus for tax authorities

Transfer pricing

Transfer pricing is commonly discussed in the press, and the enterprises that are attracting the attention of the tax authority are generally multinational companies that have many inter-company transactions, have reported losses for many years, and/or are expanding businesses.

CIT incentives

The regulations on the conditions to enjoy CIT incentives are complicated. The guidance to classify new investment and investment expansion (these are subject to different incentive regimes) is not entirely clear. In addition, the ability to apply tax incentives is conditional on compliance to the strict accounting system requirements. Taxpayers are required to self-assess their eligibility to the tax incentives. The tax authorities therefore in tax audits focus on reviewing the taxpayers’ fulfilment of the conditions.

Documentation of expenses

The tax authorities are strictly reviewing the documentation of expenses, including contracts, invoices, evidence of work done/benefit received, etc. Insufficient documentation is resulting in disallowance of input VAT credit/refund and CIT deductibility.

FCT on supply of goods

The customs authority has been requested to provide the tax authority with information of companies engaged in in-country import/export transactions in an effort to collect under-declared FCT arising from these transactions.

Secondment arrangements

We have seen the tax authority seek to impose FCT on reimbursements of expatriate remuneration costs by Vietnamese entities. Companies need to ensure that supporting documents are available to show amounts have been reimbursed at cost.