According to Clause 2, Article 16 of Circular 39/2014/TT-BTC dated March 31, 2014, regarding the time of invoice issuance for goods and services, the following applies:
1. Regarding the sale of goods:
This is the point at which ownership and the right to use the goods are transferred to the buyer.
2. Regarding service provision activities:
It is the point at which the provision of a service is completed or each part of it is completed.
If the service provider collects payment before or during the provision of the service, the payment is collected on the designated payment date.
In the case of service businesses, the invoice does not necessarily need to include the "unit of measurement" field.
According to Official Letter No. 13675/BTC-CST dated October 14, 2013, from the Ministry of Finance to the Vietnam Association of Auditors:
"In cases where an organization provides services such as accounting, auditing, financial and tax consulting; valuation; surveying and technical design; supervision consulting; preparation of construction investment projects; or receives deposits or advances to guarantee contract performance (at the time of receiving the money, the service has not yet been provided or the contract has not yet been performed), the organization providing the services is not required to issue a VAT invoice for the deposit or advance payment used to guarantee contract performance."
ThereforeRegarding deposits and advances used to secure contract performance, businesses receiving these funds are not required to issue invoices as per regulations.
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