Payroll tax mistakes new employers make (2026)

What this is

This is a process guide for US founders who just hired the first W-2. It is not a substitute for IRS Publication 15, a state handbook, or a CPA. We will not walk you through “how to avoid deposits.” We will name the mistakes that show up after someone bought payroll software and assumed the logo was the compliance.

How to choose payroll software for your first employee is the buying page. First-hire stack is the rest of the pile. Best payroll software for small business is the short list. This page is what goes wrong after you pick.

The mistakes

• No EIN, or payroll on a personal SSN, because the entity paperwork is “in progress.” Stop. Finish the EIN. Then run payroll.
• Debiting a personal checking account. Mix is a books problem and a liability story. See mistakes when picking business banking.
• Skipping workers’ compensation because the payroll app’s checkbox was optional. Many states want the policy before day one.
• Treating a 1099 as cheaper payroll. Misclassification is not a SKU. Contractor Only (Gusto $35 + $6 as of September 21, 2026) is for people who are actually contractors.
• Gusto Simple with a second work state. Simple is single-state on the public card. Plus is $80 + $12. OnPay publishes included multi-state at $49 + $6 — confirm onpay.com. See Gusto vs OnPay.
• Ignoring SUI, local taxes, and new-hire reports because the demo was federal-only.
• Paying “salary” to avoid overtime without counsel. Software will file the hours you enter.
• Switching vendors mid-quarter and double-filing or skipping a deposit. Cut over on a planned payday.
• Owner draws labeled as payroll, or payroll labeled as draws. S-corp reasonable compensation is a CPA sentence. See first-hire stack.
• Assuming restaurant or salon tips are “extra cash.” Tip reporting is a setup. See restaurant payroll and salon payroll.

What software actually does

Gusto, Square Payroll, OnPay, and Workforce advertise full-service US tax filings on standard small-business packages. That means they will compute, deposit, and file based on the setup you complete: work location, exemption, benefits, garnishments. They will not notice a missing workers’ comp policy, a misclassified coach, or a second state you never added. Paychex and ADP do the same job through a conversation — the quote is not magic compliance.

As of September 21, 2026, the published napkins remain: Gusto Simple $49 + $6; Square Payroll $35 + $6; OnPay $49 + $6; Workforce $50 + $7 and up plus QBO. None of those numbers include penalties for late deposits you caused.

A cheap control

After the first live run: download the register, look at federal, Social Security, Medicare, and state lines, and ask a CPA “does this look like a first payday or a missing tax.” Put the debit on a dedicated account or Relay envelope so you cannot raid it for ads. Calendar quarterly and annual forms even if the vendor files — you still own the company. Read Is Gusto worth it if you do not have a product yet.

When to call a human

• Multi-state or remote employees in a state you do not understand.
• Equity, bonuses, or a first S-corp salary fight.
• A notice from a tax agency. Do not guess in the product chat.
• A restaurant, farm, or construction certified-payroll situation. See those rankings.
• Anyone promising “AI that does your payroll taxes.” That catalog is not Incacent.