What tax implications should I be aware of if I started working in December?

If you started working in December, you should be aware that you will still need to pay income tax on the money you earned during that month. Your employer will likely withhold taxes from your paycheck, but you may need to file a tax return in April to ensure you have paid the correct amount. It's important to keep track of your income and any tax documents you receive to accurately report your earnings to the IRS.