Ryan McBee has started blogging for iSolutions Partners. His first post is up with a look at the Updated Payroll Tax Liability Formula for Dynamics GP .
Updated Payroll Tax Liability Formula for Dynamics GP – iSolutions Partners
Microsoft & the GP EcosystemPayroll & HR
Archived post from 2011. Dynamics GP and the links it points to have changed since; check current documentation before relying on version-specific steps.