Follow these steps to start using Invoi.
#1. Create your account
Go to app.invoi.vn/sign-up and sign up free. No credit card is required to get started.
#2. Complete company profile
Add your company information and legal representative details so invoices show the correct identity and tax number (MST).
#3. Activate eSignature
Every plan includes free cloud eSignature. Complete the DK01 (01/ĐKTĐ-HĐĐT) registration flow under Settings → Company profile when you are ready to issue official e-invoices. See eSignature & DK01.
#4. Add a customer
Create a contact with company name and MST. Solo+ includes up to 20 contacts; VIP is unlimited.
#5. Issue your first invoice
Open Invoices → Create, choose a series/template, add line items, and send. Learn more in Create Invoice.
#6. Invite your accountant (optional)
Share the workspace so your accountant sees invoices and exports without email handoffs. See Invite Accountant.
If you have another legal entity, add it under Companies on the same email — see Multiple companies.