Tax Collected at Source (TCS) is a mechanism used by the government to collect taxes at the source of transaction. It is applicable to various types of transactions including the purchase of goods and services. When it comes to overseas spending using credit cards, TCS can be applicable in the following ways:

1. TCS applies when individuals use their credit cards to make purchases from foreign websites or foreign merchants.
2. Typically, credit card companies are responsible for collecting the tax at the time of settlement and remitting it to the government.
3. The tax rate for TCS on overseas spending can vary depending on the nature of the transaction and the applicable tax laws.
4. The TCS amount is generally included in the overall transaction amount shown on the credit card statement.
5. Residents who have incurred TCS on overseas spending might be eligible to claim a credit or a refund while filing their income tax returns, subject to the tax laws and regulations of the country.

It is important for individuals to stay informed about the specific TCS rates and regulations applicable in their country when making overseas spending using credit cards.