What happened is the W-4 withholding system changed about 4 years ago so the employer may have been on the old system and then when the new payroll person came on they changed the company to the new withholding system ... what you need to do is fill in a new W-4 form and if you are married your spouse should also.
Use the Tax Withholding Estimator on the IRS web site to figure out what you and your spouse should each put on the W-4 forms that you give to your employers. It's much easier than using the worksheets on the form. It will let you adjust your withholding to get the approximate refund amount that you want.
