What are some alternatives?
When comparing Zenefits and TaxJar, you can also consider the following products
BambooHR - Personalized HR software for SMBs
Avalara - Avalara TaxRates API is an easy way for developers to use sales tax rates in their project.
UltiPro - UltiPro is another HR application available to use on multiple platforms such as Android and iOS etc.
Taxamo - SaaS solution for the new 2015 EU VAT rules
Paycom - Paycom is a Human Capital Management system that helps companies manage the complete employment life cycle, from recruitment to retirement.
Octobat - Octobat provides automated tax-compliance and accounting for digital businesses.