Vietnam’s provincial tax departments aggressively weaponize the Corporate Income Tax (CIT) audit to strip away unverified deductions. For foreign-invested enterprises (FIEs) accustomed to lenient international accounting standards, the realization that legitimate business expenses do not automatically qualify as tax-deductible often hits during a brutal post-licensing field audit.
Under the new Law 67/2025/QH15 and guiding Decree 320/2025/ND-CP, the General Department of Taxation (GDT) operates on a strict paradigm of presumption: every expense is considered non-deductible until mathematically and legally proven otherwise.
The 3 Golden Rules for Deductibility
If a reported corporate expense fails a single hurdle in this three-part statutory test, the state completely rejects the deduction, artificially bloating your taxable profit and increasing your finalized CIT burden.
1. Actual Business Connection
The expense must tangibly relate to the actual production or operational activities of the registered enterprise. Buying luxury goods, personal family vacations for the foreign director, or financing an unregistered side-business fails the business connection test. You must tangibly demonstrate how the expenditure generated taxable revenue for the specific, licensed entity operating in Vietnam.
2. Authentic Electronic Invoices
A simple printed receipt from a restaurant holds zero weight during a tax audit. Since the nationwide rollout of Decree 123/2020/ND-CP, the state only recognizes statutory electronic invoices (e-invoices) bearing a unique GDT validation code. If you purchase raw materials or services from an underground supplier unable to issue an official e-invoice, you legally forfeit the ability to claim that expense against your CIT liability. Internal documentation—such as labor contracts and timesheets for payroll deductions—must also be perfectly intact and physically signed.
3. The Non-Cash Payment Threshold (VND 5 Million)
This rule destroys more FIE deductions than any other. Due to recent anti-fraud measures under Circular 20/2026/TT-BTC, for any single invoice totaling VND 5 million or more (inclusive of VAT), you must strictly execute payment via a traced commercial bank transfer, massively reduced from the old 20 million threshold.
If your procurement team pays a VND 6 million supplier invoice using company petty cash, the General Department of Taxation instantly invalidates the deduction—and strips your right to claim the associated input VAT. Furthermore, deliberately splitting a massive purchase into multiple VND 4 million cash invoices with the exact same supplier on the exact same calendar day severely violates anti-avoidance laws, triggering immediate audit failure.
The Strictly Non-Deductible Blacklist
Even with an airtight e-invoice and a documented bank transfer, Law 67/2025 outright bans foreign enterprises from deducting certain categories of expenditure. These items must absorb directly into your after-tax net profit, significantly shrinking your dividend pool.
Administrative Fines and Penalties
You cannot utilize state penalties to lower your state tax burden. The General Department of Taxation severely blacklists all administrative fines. This includes late-filing fees for tax returns, compounding 0.03% daily interest for tax arrears under the tax administration penalty framework, environmental violation fines, and even minor traffic tickets incurred by your company’s logistics fleet.
Unsubstantiated Depreciation
If you purchase heavy manufacturing machinery but fail to properly register the fixed asset with the provincial tax authority, or if you aggressively accelerate the asset’s depreciation beyond the rigid timelines established in Circular 45/2013/TT-BTC, the excess depreciation value becomes entirely non-deductible.
Excessive Interest on Loans
For foreign entities relying heavily on inter-company debt to finance operations, Vietnam heavily caps deductible interest. Under Decree 132/2020/ND-CP governing Transfer Pricing, total deductible interest expenses cannot exceed 30% of the company’s EBITDA (Earnings Before Interest, Taxes, Depreciation, and Amortization). This cap exists specifically to prevent multinational parents from artificially stripping profits out of Vietnam via extreme interest rates on internal loans. Moreover, interest paid on loans to contribute charter capital is completely non-deductible if the foreign investor failed to fulfill their capital timing commitments registered on the Investment Registration Certificate (IRC).
Expatriate Welfare Limitations
Compensating foreign experts requires intricate planning to secure CIT deductibility while simultaneously shielding the employee from crushing Personal Income Tax (PIT) liabilities.
Housing allowances for foreign general directors commonly trigger intense scrutiny. While technically deductible, the housing provision must be explicitly mandated within the formal employment contract and strictly align with the company’s internal fiscal policy. If you pay a foreign director’s $3,000 monthly apartment lease directly from the company bank account without it existing in the labor contract, the tax inspector will strike it down.
Similarly, covering the tuition fees for an expatriate’s children to attend international schools in Vietnam is fully deductible for the corporation. However, the exact invoice from the international school must bear the company’s specific name, address, and localized tax code—not simply the foreign parent’s credit card receipt.
Secure Your Deductions with Licensed Accounting Management
Fighting a provincial tax inspector over the validity of a corporate deduction during a hostile field audit is a losing battle. The defense must begin on day one, structuring internal financial policies, rigid e-invoice collection protocols, and precise labor contracts to form an impenetrable compliance shield that guards your standard rate and any valid tax incentives. Our tax compliance management service systematically builds this shield before any audit materializes.
The Certified CPAs and Tax Compliance team at ICLV rigorously manage the entire localized accounting lifecycle for foreign-invested companies. We systematically reject invalid invoices before they pollute your ledger, intercept cash-payment violations, and structure your expatriate compensation packages to guarantee maximum, legally defended corporate deductions. Contact our Service Quality team to insulate your profit margins against aggressive non-deductible adjustments today.
