Here the tax law for Iran:
VAT in Iran is 5%. This also applies to the Outside of Iran. Some of products have no tax (foods, drugs , ...).
Shipping tax is 5% too.
Currency: ریال [iRR] (Rial)
Currency 2: تومان [iRT] (Tooman) (slang, but semi official and is more used than rial!)
1 Euro = 4...