要有“VAT Refund for Tourists”标识的地方买东西才可以退税，貌似boots跟Big C是不可以的，不确定，像著名的曼谷包就是不可以退税的。7%是退税比率。在同一家店同一天购物要超过2000B，总的可退税购物金额要超过5000B.（Goods must have a value of at least 5,000 baht (including VAT), and single purchases must have a value of at least 2,000 baht per day.）
“1.As a tourist, you are not required to pay Value Added Tax (VAT) on items more than 5,000 Baht that you intend to take out of Thailand. 2.Stores participating in the refund scheme display a sign stating: "VAT Refund for Tourists". If you make a purchase from these stores, ask for a VAT Refund Form (P.P 10) and keep the original tax invoice(s) a store gives you.That is really all you need to do.3. If you take that paperwork to the 'Customs Inspection for VAT Refund' desk at Bangkok, Chiang Mai, Hay Yai, Phuket or U-Tapao International Airports, you will be granted a tax refund. Bear in mind that the tax refund process is the final stage of your journey in Thailand - you will have gone through passport control on your return leg before you arrive at the appropriate counter.4. You can only make claims on the day you leave the country.If your claim is for less than 30,000 Baht, you can receive a payment as a cheque or Bank Draft, or the amount can be paid into a credit card account. If your claim is for over 30,000 Baht, you can only receive payment by Bank Draft or payment into a credit card account. For more information on VAT refund, visit the Revenue Department of Thailand's website: http://www.rd.go.th/vrt/howwill.html”
或者这个网站说的更详细：http://www.bangkok.com/shopping-vat-refund.htm#

在boots买过可以办退税啊，应该是超2000铢，也是填个黄色退税单，然后值机前盖章，安检后去指定柜台拿退税

泰国退税，仅仅适用在高级商品。如：名牌服饰
日用品和零食，不能退税的！

尚泰在你付款时，就会给你一张退税单啊，并会告诉你去柜台退好。

你买东西时候问一句是不是可以退税就可以了