Final answer:
You do not need any earned income to contribute to a Tax-Free Savings Account (TFSA); it allows contributions regardless of income level, up to a limit set annually by the government.
Step-by-step explanation:
The Tax-Free Savings Account (TFSA) is a Canadian savings vehicle that does not require you to have earned income to contribute. Contributions to a TFSA are made with after-tax dollars, meaning you can contribute regardless of your income level. The information provided regarding the earned income tax credit and Roth IRAs pertains to different aspects of financial planning and tax strategy but does not directly relate to TFSAs. It's crucial to understand that the TFSA contribution limit is set by the government each year and is not based on your income. Therefore, any individual over the age of 18 with a valid Social Insurance Number can contribute up to the maximum limit set for that year, regardless of their income.