o·ver·with·hold 
(ō′vər-wĭth-hōld, -wĭth-)
(ō′vər-wĭth-hōld, -wĭth-)v. o·ver·with·held (-hĕld), o·ver·with·hold·ing, o·ver·with·holds
v.tr.
1. To deduct (an amount in withholding tax) beyond the tax owed.
2. To subject to overwithholding.
v.intr.
To deduct too much withholding tax.