Five fundamental tax misconceptions leading to tax reassessment for household businesses

Five fundamental tax misconceptions are leading to tax reassessments for household businesses. Under Circular 40/2021/TT-BTC, Article 4, Paragraph 2, the tax liability for household and individual businesses is calculated based on the total amount of sales, processing income, commissions, and service revenues arising in the period, regardless of whether the money has been received. The rule reflects two legal principles: revenue is determined when the economic transaction occurs (within the period), not when cash is collected; and cash flow is not a basis for determining taxable revenue. Misapplying these principles can result in incorrect declared data and subsequent reassessment.

Misconception 1: Revenue is recorded only when money is received

Many household businesses record revenue only when funds arrive in their account. For credit sales or amounts owed, revenue is often left unrecorded. This contradicts Circular 40/2021/TT-BTC, which provides that revenue arises when goods are sold or services are provided, regardless of payment timing. Outstanding amounts are treated as civil debt and do not change the tax obligation. If the revenue that has arisen but was not declared is discovered, it may be reassessed and late payment penalties may apply at 0.03% per day on the unpaid tax.

Misconception 2: Cash is received first, then revenue is allocated over time

Some sectors may break down revenue into monthly portions for reporting after receiving cash. However, Circular 40/2021/TT-BTC, Article 4, Paragraph 2, does not allow revenue to be allocated over time based on cash collection. Once money is collected, the economic transaction is complete in value, and the collected amount is considered revenue for the period. There is no legal basis to allocate revenue across service periods. Tax authorities may adjust the data and impose additional taxes and penalties if revenue is allocated in this way.

Misconception 3: No invoice means no tax obligation

Some online businesses believe that without an invoice, tax authorities cannot record revenue. This is not supported by law. Circular 40/2021/TT-BTC, Article 3, Paragraph 1, states that any business activity involving goods or services is subject to tax. An invoice is a recording tool, not a condition for the tax obligation. If a taxpayer fails to declare or declares incompletely, the tax authority may determine liability based on available data and may apply tax assessments under Article 50 of the Tax Administration Law 2019.

Misconception 4: Mixing cash flows leads to assessed revenue

A common practical problem is mixing personal and business funds in a single account. When it is difficult to separate the basis for taxation, the tax authority may assess revenue based on the funds collected. In some cases, if the taxpayer cannot demonstrate the tax bases, the authority may treat all funds in the account as taxable revenue.

Misconception 5: Revenue below 100 million VND per year means no declaration is needed

The 100 million VND per year threshold is often misunderstood. Under Circular 40/2021/TT-BTC, Article 4, Paragraph 2, individual business entities with annual revenue up to 100 million VND are not required to pay value-added tax or personal income tax. However, this is an exemption from tax payment, not an exemption from tax administration. The tax authority can still determine actual revenue. If actual revenue exceeds the threshold, tax obligations arise and previously declared figures may be adjusted. Assuming “tax not required” based on the threshold can lead to reactive penalties during audits.

Core issue and implications

Across all five misconceptions, the central error is equating taxable revenue with cash actually received. The law states that revenue is determined by when the transaction arises, not by whether money has been collected. Taxpayers are required to declare accurately, truthfully, and fully, and to file tax returns on time. When the principle of revenue determination is misunderstood, subsequent declarations are likely to be incorrect, increasing the risk of tax reassessment.