QUICK ANSWER
Gusto is the best payroll software for most agencies and professional services firms in 2026 — it handles the salaried-plus-contractor mix that defines agency teams, files taxes in every state your remote employees live in, and layers on benefits good enough to compete for talent. OnPay is the value pick at $40 plus $6 per person with every feature included, and it is particularly strong for firms juggling multi-state registration for the first time. ADP Run is the right call once you pass roughly 25 to 50 people and need PEO-style HR depth behind the payroll. All three pay 1099 contractors alongside W-2 staff, which is non-negotiable for agencies that scale up and down with client work.
Key Takeaways
- Multi-state filing is the agency deal-breaker — with remote designers and account managers spread across states, you need software that registers, calculates, and files in each one; Gusto and OnPay both do this well, though Gusto charges extra for multi-state on its base plan.
- Contractor payments should be first-class — agencies routinely run 20% to 50% of their labor through freelancers, so look for unlimited 1099 payments and automatic 1099-NEC filing in January.
- Expect to pay $46 to $120 per month for a small team — a six-person studio lands around $76/month on Gusto Simple or $76/month on OnPay before add-ons.
- Benefits win talent wars — professional services compete on salary and benefits, and Gusto’s in-house health, 401(k), and workers’ comp brokerage is the most complete at this price point.
Best Payroll Software for Agencies and Professional Services
Agency payroll has a specific shape: salaried creatives and consultants, a rotating bench of 1099 freelancers, employees who moved to another state and kept their jobs, and partners who take draws or S-corp salaries. The wrong payroll tool turns that mix into hours of manual work each cycle and registration headaches every time someone relocates. We evaluated the major platforms on multi-state tax filing, contractor support, benefits administration, and how cleanly payroll data flows into QuickBooks Online or Xero for job-cost reporting against client retainers. These three came out ahead for firms between 2 and 50 people.
1. Gusto — Best overall for agencies
Gusto’s Simple plan starts at $49 per month plus $6 per person, and its Plus plan — the one most multi-state agencies need — runs about $80 per month plus $12 per person. That buys full-service payroll in all 50 states, automatic new-state registration assistance, unlimited contractor payments with 1099-NEC filing, and a benefits marketplace covering health insurance, 401(k) plans, and commuter benefits. Agencies particularly like the time-off accrual policies and the ability to set default expense and department mappings so each payroll posts to the right cost center in QuickBooks. The main knock is that per-person pricing climbs quickly on Plus; a 20-person firm pays around $320 per month.
Best for: Agencies of 5 to 50 that want payroll, benefits, and remote-team compliance in one system.
2. OnPay — Best value for multi-state teams
OnPay charges one price — $40 per month plus $6 per person — and includes everything: multi-state filings, unlimited pay runs, contractor payments, and benefits administration, with no tiered upsells. For a distributed 10-person consultancy, that is roughly $100 per month for what would cost noticeably more on Gusto Plus. OnPay’s standout for professional services is its hands-on setup: their team migrates prior payroll data and handles state registrations with you, which removes the scariest part of switching providers mid-year. The trade-off is a lighter app ecosystem — integrations cover QuickBooks, Xero, and the major time trackers, but there is no native project-costing or HRIS depth beyond the basics.
Best for: Budget-conscious firms with employees in several states that want every feature on one flat plan.
3. ADP Run — Best for firms scaling past 25 employees
ADP Run uses quote-based pricing that typically starts around $79 per month plus per-employee fees for small teams. What you are buying is headroom: as an agency grows, ADP layers on background checks, employee handbooks, HR advisory, retirement plans, and — if you eventually want to offload employment compliance entirely — a clean upgrade path to ADP TotalSource, its PEO. Payroll itself is dependable and multi-state filing is a given. The pricing opacity is the honest downside; expect to negotiate, and expect promotional rates that rise at renewal. For firms under 10 people, Gusto or OnPay delivers more per dollar.
Best for: Growing agencies that want HR infrastructure and a PEO option on the same vendor relationship.
Agency Payroll Software Comparison
| Platform | Starting Price | Multi-State Filing | Contractor Payments | Best For |
|---|---|---|---|---|
| Gusto | $49/mo + $6/person | Yes (included on Plus) | Unlimited, with 1099-NEC filing | Best overall for agencies |
| OnPay | $40/mo + $6/person | Yes, included | Unlimited, same per-person rate | Best value, multi-state |
| ADP Run | ~$79/mo + per employee (quote) | Yes, included | Yes, add-on filing | Scaling firms needing HR depth |
What Agencies Should Check Before Committing
Three items deserve a hard look during the trial. First, worker classification: if a freelancer works set hours under your direction with your tools, several states will treat them as an employee regardless of the 1099 label, and misclassification penalties routinely run into five figures — pick software that makes converting a contractor to W-2 painless, because you will do it. Second, general ledger mapping: agencies live on gross margin per client, so make sure payroll expenses can post by department or class into your accounting system rather than as one lump wage line. Third, off-cycle runs: bonuses at contract signing and final checks for departing staff should not cost extra; Gusto and OnPay include unlimited runs, while some legacy providers still charge per run.
Recommended Resources
QuickBooks Online for Beginners 2026 — Most agency payroll platforms sync straight into QuickBooks Online; this guide covers setting up classes and departments so payroll costs land against the right clients.
Bookkeeping Workbook For Dummies — Practice exercises for wage accruals, payroll liabilities, and reconciling payroll clearing accounts — the entries agency bookkeepers get wrong most often.
Frequently Asked Questions
An employee moved to another state — what does my payroll software actually need to do?
More than most owners expect. When an agency employee relocates, your firm generally becomes an employer in the new state, which triggers four obligations: registering for state income tax withholding, registering for state unemployment insurance (SUI), applying the new state’s rules on things like paid sick leave and disability contributions, and possibly carrying workers’ comp coverage there. Good payroll software handles the calculation and filing side automatically once the registrations exist — Gusto and OnPay will both walk you through or handle the registration paperwork, while some providers just hand you a checklist. Watch two details. First, timing: states expect withholding from the employee’s first paycheck at the new address, so update their work location in the payroll system the pay period they move, not at year-end. Second, reciprocity and convenience rules: a handful of states tax based on where the employer is located rather than where the employee sits, which can mean withholding in two states for the same paycheck. If you have employees in four or more states, it is worth a one-time consultation with a payroll-savvy CPA to confirm your setup — the software executes what it is told, and the expensive mistakes happen at configuration, not calculation.