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What actually comes out of a paycheck and what comes back at filing — withholding, the deductions worth claiming, and the quarterly payments nobody warns freelancers about.
Tools these guides use
The caps, the phase-outs, why only the premium half of overtime counts, and the one W-4 line that decides whether you see the money monthly or as a refund.
Who has to pay US quarterly estimated taxes, the 2026 due dates, how to work out the amount, and the safe-harbor rule that stops you being penalised.