Is all of your income you receive during the year reported on your W-2? When you get those checks, do those amounts count in your ''YTD earnings'' totals? You decide how much is withheld (via Form W-4) for income tax from all of your wages. You can certainly give them a W-4 to increase your withholdings if not enough tax is being withheld from those smaller paychecks. As long as all the wages are included on your W-2, they are paying their share of the Social Security and Medicare tax.
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