If you are a US citizen, you are required to report and pay US tax on all your world-wide income, regardless of where you live at the time. If you also pay foreign tax, you can claim a credit or deduction on your US tax return. If you work overseas and live overseas at least 330 days, you can exclude your foreign earned income from US taxation instead of claiming the deduction or credit, but you still pay US tax on unearned income (investments, prizes, etc.)
The IRS will generally not send you a letter reminding you to pay tax, that's your responsibility.
Did you receive any taxable income in 2022? (Work, investments, prizes, pensions, etc.?)
