Mellow vs Deel for US Employers: State Tax Calculations Included
For a US employer weighing Mellow against Deel, the practical question is what you are actually buying for your US workforce — and whether state tax is handled as a core capability or treated as someone else's problem. This article compares the two honestly.
What US payroll demands
A US employer has to get two layers right. The federal layer — income tax across seven brackets, FICA, FUTA — applies to everyone. The state layer is where it gets specific: some states have no income tax, some use a flat rate, others use graduated brackets, and a city like New York adds its own tax on top.
US payroll software is only as good as its handling of that state layer.
How Mellow handles the US
Mellow calculates US federal payroll — the seven income-tax brackets driven by W-4 data, FICA with its Social Security wage base and Additional Medicare threshold, and FUTA — and includes state tax for eight launch states: California, New York, Texas, Florida, Illinois, Washington, Massachusetts, and New Jersey. Between them those states cover a large share of US employment. New York City's additional resident tax is built in.
State tax is not an add-on in Mellow. It is part of the payroll engine. The payslip shows the federal, state, and FICA breakdown clearly, and Mellow guides you through filing Form 941 and your state returns.
The question for a US employer is not "does it do payroll" — it is "does it calculate the right state's tax for each employee, included, without an add-on."
How Deel approaches the US
Deel is a global platform with US capability. Its managed payroll, an add-on at roughly $29 per employee per month, can run US payroll as part of its multi-country service. That is a perfectly reasonable model — particularly if your US team is one part of a genuinely global, multi-country payroll operation that you want one vendor to manage.
The trade-off is cost and shape. You are buying a managed multi-country service and paying the add-on price for it.
The cost comparison
For a US employer, Mellow's Professional tier includes US payroll at $10 per employee per month — the whole HR and payroll platform, state tax included. Deel's managed payroll add-on is around $29 per employee per month on top of its HR product. If your workforce is primarily US-based, that gap is significant.
Where Deel wins
If your US team sits inside a much larger global operation — people in many countries, some needing EOR — Deel's breadth and managed model may justify the price. Mellow covers six countries, not 150, and does not provide EOR.
The verdict for US employers
If you employ people in the US through your own entity and want state tax handled as a core, included capability at a transparent price, Mellow is built for that. If your US workforce is one node in a sprawling global EOR operation, Deel's model fits better.