07/08/31 00:58:57 Z4Rx/WVy
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ここを参照されたし（タイ税関のホームページ）
↓
URLﾘﾝｸ(www.customs.go.th)
3. Categories of Postal Items
Postal items sent from abroad to Thailand are subject to selective
inspection by the Customs officers and can be categorized into
3 groups as follows:
Group 1 Postal items sent by mail and the value of each dose not
exceed 1,000 baht , or trade samples of no commercial value are
exempted from duty. The Customs officers will deliver such items
to the Communication Authority of Thailand for further distribution
to the consignees
Group 2 Postal items, regardless of the number of packages, sent by mail
as personal effects, gifts or trade samples of no commercial nature
sent at the same time by one consigner to another consignee or
arrived simultaneously with a declared value not exceeding 20,000 baht
and regardless of the implied amount of duties payable, the customs
officers will independently make assessment of their value and deliver
such items to the Communication Authority of Thailand for delivery to
the consignees from whom duties will be collected on behalf of the Customs.
Group 3 For postal items other than Group 1 and Group 2, the Customs officers
will select and deliver such items to the Communication Authority of
Thailand for storage in the Postal Customs Warehouse pending
the consignees taking delivery of a same
今回の場合、グループ2に該当。
タイの場合の免税範囲は、1000バーツまでなので（グループ１を参照）
それ以上の課税標準であれば、内容物の所属区分により該当の関税率等（ＶＡＴ等も含まれる）がかかります。
海外に物を発送するまえに、送付国の税関のサイト等で免税限度額、税率等を確認したほうが良いでしょう。