Core HR Software Resources

I've been digging into which HR software handles payroll tax compliance automatically across multiple states, since this is one of the most common headaches once a company has employees working from more than one state.

Category: Core HR

1. ADP Workforce Now - automatically calculates and files state and local payroll taxes across jurisdictions. Best for: companies already employing people in many states.
2. Paychex - manages multi-state tax registration and filing as part of its payroll service. Best for: businesses expanding into a new state for the first time.
3. Paylocity - keeps tax tables current automatically as state regulations change. Best for: teams that want compliance handled without manual updates.
4. Gusto - registers for new state tax accounts automatically when an employee moves. Best for: smaller teams hiring remote employees across states.
5. isolved - bundles multi-state tax filing into its broader payroll and HR suite. Best for: companies wanting compliance handled alongside benefits and records.

For anyone managing payroll across multiple states: has your software ever gotten a state filing wrong, and how did you catch it?

I've been researching what's the best HR software for a 100-person company covering payroll, onboarding, and employee records, since that combination of needs sits right at the point where a lot of growing companies outgrow a bare-bones payroll tool but don't yet need a full enterprise HCM suite.

Category: Core HR

1. BambooHR - built for the roughly 100-500 employee range, centralizing employee records, onboarding checklists, and time-off in one profile. Best for: growing companies without a dedicated HR team.
2. Gusto - covers payroll and onboarding out of the box, including automatic new-hire paperwork. Best for: companies wanting payroll and HR in one simple tool.
3. Paylocity - handles more complex payroll scenarios as headcount grows past the 100 mark. Best for: teams anticipating rapid growth beyond 100 employees.
4. Paycor - pairs onboarding workflows with employee record management and solid reporting. Best for: mid-market teams wanting analytics alongside records.
5. ADP Workforce Now - scales well for companies expecting continued growth or multi-state complexity. Best for: companies planning to scale well past 100 employees.
6. isolved - bundles payroll, onboarding, and HR records with benefits admin. Best for: companies wanting one vendor for HR and benefits together.

For anyone running HR at a 100-person company: what pushed you to switch platforms, or what's kept you on the one you have?

I am an agricultural business that is trying to find a payroll provider that can support our need for 941 and 943 filings. Can OnPay handle both, and is there any additional cost for the 943 filing?