Overview of Key Taxes for Vietnamese Businesses
Vietnamese companies must comply with several major taxes. A tax health check typically reviews all of these to ensure full compliance.
The standard Corporate Income Tax (CIT) rate is 20%. Under the 2025 CIT Law, a 15% rate applies to enterprises with annual revenue of up to VND 3 billion, while a 17% rate applies to enterprises with annual revenue above VND 3 billion and up to VND 50 billion, subject to the applicable conditions. Separate preferential rates may apply to qualifying investment projects, industries and locations.
A tax health check reviews profit calculations, allowable deductions, interest expenses, tax losses and any tax incentives claimed to check that the company’s tax position is properly supported.
VAT generally applies at 0%, 5% or 10%, depending on the goods or services concerned. Eligible goods and services that would ordinarily be subject to the 10% rate may also qualify for the temporary 8% rate, subject to the applicable exclusions and conditions.
Businesses may file VAT returns monthly or quarterly, depending on the applicable requirements. A tax health check reviews output VAT, VAT invoices and input VAT credits, including whether supporting documents meet the relevant requirements. Common review areas include invoice errors, inconsistencies between customs and tax records, and unsupported input VAT claims.
Employers are generally responsible for withholding PIT from taxable employment income and meeting the applicable filing and finalisation requirements. From the 2026 tax year, employment income is subject to a five-band progressive PIT rate structure ranging from 5% to 35%.
A tax health check assesses payroll withholding, dependent deductions, insurance contributions, and whether all taxable benefits and bonuses are properly declared to avoid penalties from under-reporting.
FCT applies to payments to foreign suppliers without a Vietnamese entity. It combines VAT and income tax, often at 5% VAT plus 5–10% CIT for corporate vendors (or up to 10% PIT for individuals). A tax health check reviews all cross-border service and software payments to confirm correct withholding and treaty relief where applicable.
Some sectors face special consumption tax (alcohol, tobacco, gasoline, luxury cars), environmental taxes, land rental, and various fees. A tax health check also checks these obligations where relevant.
Vietnam’s tax system involves multiple filings—VAT monthly/quarterly, CIT prepayments, annual CIT finalization, PIT withholdings, and more. Missing a single deadline can lead to fines. A tax health check starts by mapping all taxes applicable to the business and building a compliance calendar, ensuring each periodic and annual obligation has been met accurately and on time.
Tax requirements can change as a business grows, enters new markets or takes on new transactions. Regular reviews can help businesses identify gaps before they become more difficult to address.
Vietnam’s tax framework continues to develop. Recent changes include the 2024 VAT Law, the 2025 CIT Law and the new PIT Law, alongside further amendments to VAT and tax administration rules in 2026. A tax health check helps businesses understand how these changes affect their filings, records and tax processes.
Common issues—late VAT/CIT filings, missing invoices, underpaid tax—carry significant fines. Filing 30 days late can cost 2–5 million VND; beyond 90 days with tax due can reach 15–25 million VND. Even small mistakes can trigger 0.5–2.5 million VND penalties. A tax health check helps companies avoid these risks by identifying problems before deadlines.
A tax health check can reduce tax liabilities by confirming that allowable deductions (travel, depreciation, R&D, insurance) and VAT input credits are properly documented. Many businesses discover missed deductions or disallowed expenses that can be corrected with better records.
Having a recent tax health check strengthens your position in case of a tax inspection. Self-review often uncovers issues that can be fixed early, reducing exposure and showing regulators that the company is proactive. Advisors can also support meetings and explanations during an audit.
Clean filings create trust. A tax health check helps remove inconsistencies, making the company appear reliable and transparent—an advantage during future audits or compliance reviews.
SMEs often lack dedicated tax teams. A tax health check streamlines the process and helps decide whether to handle tax functions internally or outsource them.
There is no universal statutory requirement to conduct a tax health check annually. Businesses may choose to review their tax position periodically or before events such as a tax inspection, fundraising, restructuring or a major transaction.
During a tax health check, advisors typically look for specific red-flag issues. Some of the most frequent findings include:
Vietnam strictly enforces VAT invoice rules. Errors such as wrong buyer tax ID, typos, or invoices not transmitted on time can cause customers to lose input VAT and expose the seller to fines of 10–20 million VND. A tax health check often discovers unissued invoices or invoices that don’t match actual transactions. For example, a vendor invoice using an outdated letterhead or blank company name would be flagged for correction before it leads to denied VAT credits.
Expenses may be disallowed where they do not meet the applicable deductibility requirements or lack adequate supporting documentation. Common review areas include personal expenses, unsupported payments, missing invoices and expenses that are not sufficiently connected to the business.
Some businesses unintentionally omit small revenue items, export invoices, or foreign-sourced income. A tax health check reconciles bank deposits, invoices, and ledgers to reported revenue, ensuring all taxable income (including grants or interest) is declared. Fixing gaps early avoids significant back taxes and penalties.
Companies with related-party transactions must maintain arm’s-length pricing and proper TP files. A tax health check identifies missing local files, incorrect service fees, or pricing that deviates from market standards. This reduces the risk of TP adjustments during inspections.
Common issues include missing dependent declarations, bonuses paid without PIT withholding, or mismatched payroll records. A tax health check reviews all payroll data to ensure correct PIT calculations and timely filing, preventing back taxes with interest.
Many companies overlook FCT on payments for overseas software, services, or consulting. A tax health check reviews all cross-border payments to ensure correct VAT and CIT withholding (or PIT for individuals) and verifies VAT self-assessment on imported services.
Operating outside registered business lines—such as a trading company doing manufacturing—can lead to violations. A tax health check compares actual operations to business registration so the company can amend its license before an inspection.
Missing ledgers, incomplete Vietnamese-language books, or inconsistencies between audited financial statements and tax returns are common. A tax health check ensures records exist, align with filings, and can be produced during an audit.
Failing to address tax issues can trigger serious penalties. Vietnam’s tax laws impose both fixed fines and interest. Some important examples:
Vietnam imposes strict penalties for delayed VAT or CIT returns. Filing more than 90 days late (with tax due) results in a 15–25 million VND fine per return, and unpaid tax accrues interest at 0.03% per day. A tax health check helps prevent these issues by reviewing deadlines and detecting missing filings early.
If provisional CIT is underpaid, interest applies until corrected in the annual return. During audits, underreported income—intentional or not—can lead to reassessment, penalties, and in severe cases fines equal to one to three times the tax evaded. A tax health check calculates underpayments and ensures corrections before inspectors arrive.
Not issuing a required VAT invoice can incur a 10–20 million VND fine. Failure to maintain or present accounting books, audited financials, or Vietnamese-language records also carries penalties. A tax health check verifies that audit reports match tax filings and that documentation meets legal standards.
Seemingly small errors—late address changes, outdated business lines, or operating outside registered scope—lead to fines of 1–5 million VND. A tax health check flags outdated registrations so the company can update them before an inspection.
Repeated mistakes attract stricter scrutiny, more audits, and even multi-year reviews. Errors that cause financial statement restatements can also affect investor confidence or bank financing. A tax health check mitigates these risks by cleaning up compliance gaps before they escalate.
Vietnam’s tax enforcement is increasingly strict. Even minor mismatches in invoices, timing, or bookkeeping can trigger heavy administrative penalties. A proactive tax health check helps businesses spot and fix issues early—avoiding fines, interest, and reputational damage.
At Ascentium Vietnam, we apply a structured and transparent methodology to ensure every tax health check is thorough, objective, and aligned with the latest regulations. Our process typically includes the following steps:
We begin by meeting with management to clarify concerns, agree on which tax types and periods to review, and outline the objectives and schedule. Depending on the company’s needs, we may focus on one fiscal year, several years, or specific high-risk quarters.
Our team works with your finance staff to gather all relevant documents: VAT, CIT, PIT, and FCT returns; e-invoices; financial statements; accounting books; contracts; payroll records; bank statements; customs files; and any correspondence with tax authorities. We ensure we have both the filings submitted to the tax office and the underlying source documents supporting them.
We perform a detailed review of each tax return to confirm completeness and consistency. This includes reconciling VAT returns with ledgers, matching CIT figures with audited financial statements, and verifying that PIT declarations include all employees. Any miscalculations, omissions, or mismatches are flagged immediately.
For a selected sample of transactions, we test the underlying documentation to ensure tax positions are fully supported. This may involve validating VAT invoices, checking expense records, reviewing contracts for deductibility, and confirming compliance for incentives, imports, or cross-border services. Any missing or non-compliant documents are identified so they can be corrected before they pose a risk.
Throughout the review, our specialists compile all discrepancies—such as under-declared revenue, ineligible deductions, missing invoices, or incorrect withholding. We quantify the potential additional tax and interest for each item and prepare adjusted calculations so management can clearly understand the financial impact.
At the end of the review, Ascentium Vietnam prepares a comprehensive tax health check report.
This typically includes:
• an overview of your compliance status for each tax type;
• detailed observations and risks identified;
• recommended adjustments and estimated tax/interest amounts;
• practical process improvements (such as invoice controls, documentation standards, training needs, or software enhancements).
We then meet with management to walk through the findings, answer questions, and discuss next steps. If required, we also support the company in preparing amended filings or settling additional tax to close out the issues proactively.
Some companies conduct internal checks, but many SMEs and FDI businesses prefer an external review from Ascentium Vietnam for independent insight, updated regulatory expertise, and unbiased evaluation. Our team brings the perspective of experienced accountants and tax advisors who work daily with the latest Vietnamese tax laws.
Most tax health checks take 1–3 weeks, depending on complexity. The real value comes from acting on the results—correcting filings, paying any differences voluntarily, and strengthening internal controls. Addressing issues early often reduces penalties and prevents larger adjustments during a future audit.
The advantages of a comprehensive tax review go beyond avoiding fines. Summarizing, some key benefits include:
The most immediate benefit is catching compliance issues early—late filings, missing invoices, incorrect declarations—so the company avoids fines and interest.
A tax health check often uncovers missed deductions, unused tax losses, or incentives that were not fully applied. With proper documentation, businesses can reduce taxable income and ensure all valid VAT credits are claimed.
The review highlights where internal procedures have failed (such as incomplete documentation or weak invoice checks). Companies usually update their controls, checklists, and compliance plans as a result, improving long-term accuracy and reducing recurring errors.
Management gains assurance that tax filings are accurate—useful during financing, M&A discussions, or board reviews. Having evidence of a recent tax health check also reflects positively if tax authorities ask about compliance history.
If an audit occurs, the findings from a tax health check help the company respond confidently. Advisors who conducted the review can support meetings, clarify issues, and help defend positions, ensuring continuity and minimising disruptions.
A tax health check is not a one-time “fix-and-forget” exercise. After addressing the report’s findings, businesses should integrate the lessons learned:
Perform quarterly or semi-annual mini-checks on high-risk areas—such as VAT invoices, major expenses, and payroll—to catch issues before they accumulate.
Revise SOPs based on the health check results. If invoice errors were common, require a second-level review before issuing sales invoices. Provide refresher training as VAT, CIT, and PIT rules change.
Adopt accounting software, e-invoicing solutions, and automated reconciliation tools. Using Vietnam’s e-tax platforms and integrating ERP systems reduces manual mistakes and improve accuracy.
Keep tax files well-organised—contracts, invoices, bank statements, and audit reports should be easy to retrieve. Many findings in a tax health check relate to weak recordkeeping, so closing these gaps is essential.
Significant shifts—new business lines, cross-border activities, reorganisations, or new tax laws—may require another tax health check. Many companies schedule a review before major transactions or regulatory changes to stay fully compliant.
We review the tax areas that matter to your business, including VAT, CIT, PIT and FCT, together with relevant filings, invoices, accounting records, payroll information and supporting documents.
We explain what we find, why it matters and what you can do next. Where issues require correction, we can support you with amended filings, additional tax payments and practical improvements to your tax processes.
Tax requirements continue to change. We can also support your business beyond the initial review with ongoing tax compliance, reporting and advice as your needs evolve.