Why do I have an overpayment or underpayment?

The most common causes of tax overpayments and underpayments are:

Incorrectly entered tax rate; in particular, the state unemployment insurance (SUI) rate. For more information about resolving tax overpayments and underpayments caused by this issue, see SUI rate: Resolving SUI payments after you correct the rate.
Paychecks added or deleted after the tax payment was approved for the payroll period.
Incorrect reconciliation of historical taxes

What can I do about overpayments or underpayments?

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