So many countries already have it figured out. My understanding is by law income already needs to be reported to the IRS (from your employer or by you). I would

So many countries already have it figured out. My understanding is by law income already needs to be reported to the IRS (from your employer or by you). I would imagine that's all you'd be legally signing off on. That's all I remember confirming when living abroad. If your income is accounted for correctly is there a scenario that would increase your tax liability assuming you already qualify for a standard deduction?