Can anyone recommend us a local Accounting firm (or Accountant) to handle our first tax filing? We do not yet have many transactions (no revenues, just expensed due to startup), but we are required to file a tax declaration.

Look near your office for a small CPA firm, typically in a home office or small building.

You should be able to find a CPA that will charge around 10,000 baht for your financial statements and annual audit tax returns and book keeping will be extra.

Either you are from Bangkok and assume everyone on here lives there too; or you are American and have just arrived thinking that Thailand is a small country so everywhere is going to be local to you .