Online Sales Tax in Iowa

Does Iowa require a merchant to charge and collect a sales tax for online purchases?

Yes, if they are taxable goods that are devlivered in Iowa. Source

What is the online sales tax percentage in Iowa?

6% + Local Option sales tax if applicable Source

When does an Iowa online business have to charge Iowa Sales Tax for an online purchase?

When that good / service is otherwise taxable and delivered within the State of Iowa. Source