Further to your following email, can I summarize your questions as followings:
1. Payment the bill outside Laos which including of Professional Fee, Construction Design, Interior Design and other services: Before making payment to the suppliers outside Laos, you need to withhold the VAT 10% and Profit tax 24% of 20% or equivalent to 4.8% from the suppliers and then pay such taxes to the Lao Govt. It means that you need to withhold two types of taxes before making the payment to suppliers outside Laos
2. Payment made in Thai Baht and send all the document for recoding in Lao Accounting Book: Yes, you can do so; however, once those expenditures are being booked into Lao account, they are required to translate into local currency (Lao Kip or “LAK”).
We do hope that the above clarifications are met you requirement