Start with the fee. A PEO that charges a percentage of payroll bills you more every time an engineer gets a raise, while a flat per-employee, per-month (PEPM) fee stays put. For a company built on hiring and keeping technical talent, that line in the quote shapes long-run cost more than any feature in a tech demo.
After the fee, judge a professional employer organization (PEO) on who carries the liability for your federal payroll taxes, whether its benefits close the gap your employees feel, whether its HR technology puts payroll, enrollment, and records in one system, and what it files in each state where you have remote employees.
Then ask the question most comparisons skip: who answers when a payroll run goes wrong?
A good PEO earns its fee through structure, with one partner and one accountable team in place of separate payroll, benefits, and compliance vendors.
Pricing structure comes first because it compounds. Under percentage-of-payroll pricing, the administrative fee rises with wages, so a raise for a senior developer is also a raise for your PEO. Questco charges per employee per month instead, so if payroll rises and headcount holds, the fee does not move.
| Fee basis | What the fee follows | When an engineer gets a raise |
|---|---|---|
| Percentage of payroll | Wages | The fee rises |
| Flat per employee, per month (PEPM) | Headcount | The fee stays put |
Questco’s quotes and monthly invoices break out administration fees, benefit costs, workers’ compensation insurance, and state unemployment tax (SUTA). A single bundled number makes two quotes hard to compare.
Judge it by who is legally on the hook for the filings, because accuracy you cannot test during a sales cycle is backed by liability you can check.
A certified professional employer organization (CPEO) is generally solely liable for a customer’s federal employment taxes on the wages it pays your worksite employees, including the deposits, and it reports them under its own EIN.
Questco is an IRS-Certified CPEO and has to keep meeting IRS requirements, including tax compliance, financial reporting, and bonding, to hold that status.
Certification also matters mid-year: a CPEO has successor employer status, so switching in June does not restart your FICA and FUTA wage bases. The IRS publishes a list of certified PEOs, and the contract must carry the CPEO’s exact name and EIN.
Then ask who runs payroll day to day. Questco assigns a dedicated service team that knows your account, including a specialist you work with directly, and the team handles Forms 940 and 941 and W-2s.
Fit separates them: the benefits worth paying for are the ones employees rate highest and feel least served by. In Questco’s 2026 SMB Employee Benefits and Retention Survey, remote and hybrid work scored 4.42 out of 5 in importance, the highest of any benefit, and health insurance showed the widest gap between importance (4.23) and how well it meets needs (3.50). If your team is spread across states, ask every provider how its medical plan works in each state where you hire and how employees compare options at enrollment.
Source: Questco 2026 SMB Employee Benefits and Retention Survey.
Questco can work with your existing plan and broker, serve as broker of record, or open its large group medical plan with thousands of participants, and employees compare plans side by side at enrollment.
Less than the demo will ask for. Even if your team already works in good software, judge a PEO’s platform on whether it builds systems—payroll, enrollment, onboarding, and records—in one place behind one login.
Your engineers will form an opinion of the employee portal almost straight away.
Questco’s HR technology runs on a single sign-on platform, controls access down to specific fields and menus by role, and gives employees a mobile-friendly portal for paystubs, W-2s, benefits enrollment, and 401(k) information. Applicant tracking and electronic onboarding sit in the same portal.
Ask what the provider registers, files, and remits in each state and what stays with you, because every state adds its own accounts, rates, and deadlines.
In Colorado, any business with one qualifying Colorado employee must register with the state’s Family and Medical Leave Insurance (FAMLI) program, and an employer with ten or more employees in total, including those outside Colorado, owes the full 0.88% premium for its Colorado-based staff.
The work is shared: Questco supports tax registration, unemployment insurance, workers’ compensation, and HR guidance in all 50 states, and you keep every decision about where and whom you hire.
Run five steps, in this order.
One caveat first: with fewer than five employees, DIY HR or payroll software is usually enough, and the evaluation can wait.
| 1 | List every state where you will have employees in the next year, with headcount by state. |
| 2 | Get an itemized quote with the fee basis in writing. |
| 3 | Check the IRS list for CPEO status and confirm the contract names the CPEO and its EIN. |
| 4 | Ask who your service team is, how a payroll problem reaches them, and whether you can keep your broker or plan. |
| 5 | Ask for the calendar from signature to first payroll. |
Request a proposal from Questco and get real numbers back, itemized by line, with no obligation to sign anything. Questco has been a PEO since 1989 and serves small and mid-sized businesses nationwide.
Start at questco.net/contact-sales, or run the HR Cost Calculator first to see what your current HR tech stack costs.
A PEO co-employs your workforce: it pays wages and taxes under its own EIN, provides workers’ compensation, benefits access, HR technology, and compliance assistance, and your company keeps control of the business.
Source: NAPEO
Most companies that use a PEO have 10 to 150 employees, and NAPEO lists high-tech companies among typical PEO clients.
Certification changes who the IRS collects from: a CPEO is generally solely liable for federal employment taxes on the wages it pays to worksite employees. An uncertified PEO can still run your payroll and file your taxes, but that federal tax-liability treatment does not apply to it.
No, the client company stays responsible for business decisions, day-to-day supervision, job assignments, performance reviews, and setting salaries and benefit offerings.
Source: NAPEO
Yes, and the useful question is which registrations, filings, and payments the PEO handles in each state and which stay with you. Questco supports clients in all 50 states.