When determining your total e-commerce spend, you have to identify all online expenses, such as IT costs, personnel for marketing and merchandising, content and outside services, among other things. The costs add up quickly, which is why software as a service (SaaS) is a growing trend in where multichannel merchants are putting their e-commerce dollars.

SaaS-outsourcing the development and hosting of websites-can be a cost-effective way of gaining new site functionality, reducing operating costs with less reliance on internal IT and accessibility to continuous upgrades. SaaS costs range from 1 percent to 4 percent of sales.

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