Solved
I’m self-employed and began working as a contractor in December, 2024. Client is supposed to pay me in January, 2025 for my December's work. Do I need to report this income for 2024 or 2025?
You are almost certainly a cash-basis taxpayer and use the cash accounting method for your business. That means that you report income when you actually receive it. So if you receive the payment in 2025 you report it on your 2025 tax return. The client should issue a 1099-NEC for 2025.
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