You do not need a personality test. You need a few answers you can say out loud. If most of these are “not yet,” wait. Registering a company does not fix a fuzzy idea.
This is not legal advice. It is a filter.
#Can you name one customer?
Not “SMEs.” A person with a job: the founder who still waits on the accountant to issue a VAT invoice, the factory owner who quotes on Zalo. If you cannot name that person, you do not have a business yet. See Startup ideas and Evaluate ideas.
#Will they pay in a way you can invoice?
Company customers in Vietnam usually need a VAT invoice (Hóa đơn GTGT) before they can book the cost. If your first buyers are companies, you will need a company that can issue those invoices. If they never ask for an invoice, Invoi is not the product for that path yet.
#Can you wait for cash?
The first months are slow even when the work is real: registration, bank account, e-invoice setup, then customers who pay on 15 or 30 days. If the next rent depends on this week’s transfer, you are not starting a company. You are gambling.
#Do you know who keeps the books?
You can be the operator. You should not be the only person who understands VAT filings. If you have no accountant in mind — even a part-time one — write that down as a hole, not a later problem. See Hire an accountant.
#Is the painful job already happening?
The best early companies replace work someone already pays to get done badly. A new category you have to explain from scratch is harder. If nobody is paying for a workaround today, they probably will not pay you tomorrow.
#If most answers are yes
Write a short plan, pick a legal form, then start the company so you can invoice. The checklist is not a certificate. It is permission to spend the next month on the real sequence instead of a logo.