Same answer as @patio11 here. Usually you can plan on about 150-160% of base per employee to cover taxes and a standard set of benefits (i.e. health insurance,

Same answer as @patio11 here. Usually you can plan on about 150-160% of base per employee to cover taxes and a standard set of benefits (i.e. health insurance, 401k). These numbers typically do not decrease at scale. Although with health benefits you may be able to negotiate a slightly better rate per employee at scale. But employment taxes, etc.. are always the same with one employee or 10,000. If you start getting into exotic benefits (i.e. free meals, transportation, dry cleaning, etc...) the costs could be higher. However, these type of benefits will usually decrease with more employees as you may be able to get a better rate with more employees on the plan.