Guide for calculating nanny taxes?

looking for a guide to paying a nanny with taxes taken out. If anyone has a self made spreadsheet or state and federal taxes spelled out, that'd be great. I'm finding conflicting information on various sites and I don't really want to pay for a payroll service. 

Thanks in advance. 

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Using payroll service is the easiest way to make sure it is done right, but you can definitely do it yourself.  I would start by reading IRS Publication 926, IRS Publication 15, and California DE 44.  Then you can create a spreadsheet for yourself based on your arrangement and tax situation. Good luck.