Payroll providers all run the calculation. They differ on how much of the tax work they take on, how many states they will register you in, and the size of employer they are built for. One thing is the same whichever you pick, and it is the reason to read the tax answer carefully.
Three providers, and the criterion each was judged on
Each product page was read on 30 September 2026. The criterion is what the provider commits to on tax filing and registration, and the size of employer it is built for, both taken from the vendor's own page rather than a review site.
- Gusto: judged on the small employer with no payroll person. Its own page commits to filing the taxes with every run, state tax registration in all fifty states, unlimited pay runs at no extra fee, and collecting and storing the I-9s, W-2s and contractor 1099s, which is the whole administrative job rather than the calculation.
- Paychex: judged on growing into complexity. Its own page sells a range from a single employee to enterprise payroll with automated workflows, flags missing hours and incorrect data before the run, and puts compliance assistance beside the software, which suits an employer who expects the pay structure to get harder.
- ADP: judged on packaged tiers and multistate reach. Its own page sells payroll in tiers that add HR support as you move up and answers multistate payroll and time and attendance integration directly, which is the shape for an employer in several states that wants one vendor to grow into.
The liability never moves, whoever files
The IRS is explicit that the employer is ultimately responsible for the deposit and payment of federal tax liabilities, even where the employer forwards the money to a third party to make the deposits. So a provider's tax guarantee is a commercial promise between you and them, not a transfer of the obligation. Read what happens if a deposit is missed, and keep your own access to the tax account.
Ask which returns the provider actually files
Employers generally file Form 941 each quarter, or Form 944 annually if the IRS has told them to, plus the state equivalents. Get the list of returns the provider files in writing, by federal and by state, and ask who signs them. A provider that files federal and leaves two states to you is a reasonable arrangement, but only if you know before the first deadline rather than after it.
State registration is the hidden work when you hire remotely
A new employee in a new state usually means registering for withholding and unemployment insurance there before the first pay run. Some providers do the registration, some file only once you have the account numbers. If remote hiring is likely, that single difference will matter more than the per-payslip price.
Price the run you will actually have
Quotes are built on a simple monthly cycle with no exceptions. Take a real period with a mid-month joiner, a bonus, a correction and a leaver, and ask each provider to price and run that. The answers separate providers faster than a per-employee headline, and the exceptions are where the extra fees live.
Questions people ask about top payroll
Is the top payroll provider the cheapest one?
Not usually, and the comparison is rarely like for like. One quote may include tax filing, state registration and year end forms while another charges for each, so build the same scope for every provider before comparing the figures.
Who is responsible if the payroll taxes are not deposited?
The employer. The IRS holds the employer ultimately responsible for the deposit and payment of federal tax liabilities even when the money was sent to a third party to deposit, so the provider's promise is a contract claim rather than a shield.
How many states can a provider handle?
It varies, and it is worth asking as two questions: which states they will file in, and which they will register you in. Filing everywhere is common; registering for you is not.
How hard is it to switch providers mid year?
Easiest at a quarter boundary and hardest late in the year, because year to date figures and filed returns have to line up. If you are unhappy, plan the move for the start of a quarter and get the prior year to date data out in a format the new provider accepts.
Do we still need someone in house?
Someone has to own the inputs, approve the run and answer employee questions, and that stays with you at every provider. Buying payroll removes the calculation and the filing, not the ownership.