It used to be that if you claimed more than 10 your employer had to forward copies of your W4 in to the IRS for their review. This ruling was changed recently. So the answer is that you can claim as many dependents on your W4 as you want, BUT the IRS has the right to question the number you claim. They can do this if you end up with no taxes being withheld or if they believe you have supplied innaccurate information on the W4 form. You may have to write to them and justify why you are claiming 16 dependents for example. If the IRS doesn't like your answer they can direct your company to take withholding taxes out for 9 dependents (or whatever they think is right). The employer has a limited amount of time (45 days I believe) to comply with this directive.
You can have as many deductions are offered or you wish. There is no maximum limit for deductions on payroll.
Payroll Deductions Use this calculator to help you determine the impact of changing your payroll deductions. You can enter your current payroll information and deductions, and then compare them to your proposed deductions. Try changing your withholdings, filing status or retirement savings and let the payroll deduction calculator show you the impact on your take home pay. This calculator has been updated to use the new withholding schedules for 2010.
Here's a link to a website that explains all about payroll tax deductions and how to handle them. http://taxes.about.com/od/payroll/qt/payroll_basics.htm
Deduction from employees, Earnings for employees, Employee statutory deductions, Employers statutory contributions, Gratuity, Loans and advances and Reimbursement to employees are the types of payroll deductions
Generally speaking, employers report payroll by calculating gross pay and various payroll deductions to arrive at net pay. While this seems simple enough to understand, calculating various payroll deductions requires that the payroll accountant be detail-oriented and work with extreme accuracy.
tsse
required and volintary
Payroll Deductions
Payroll Deductions
Payroll register
Taxable incomes
Current liabilities.
There are several companies selling software for processing payroll deductions. Realtaxtools, metca, purchasingpower and sarotech are among many others that have software available.