Short answer: ADP TotalSource fits mid-market companies, roughly 50 to 250 employees, that operate in several states, want Fortune 500-quality benefit plans and need serious compliance infrastructure behind them. Justworks fits startups and small teams, roughly 10 to 75 employees, in technology, media, marketing, finance, legal or professional services, that want published flat per-employee pricing, a platform employees actually like and the option of month-to-month terms. Most shortlists containing both get resolved by two questions: how many employees do you have, and how risky is their work.
The two come up together because they overlap in the middle. Both are certified PEOs (CPEO) and both carry ESAC accreditation, so the federal tax certification and financial assurance questions land in the same place. Both serve technology, finance and legal employers. The overlap ends around the 50 to 100 employee mark and at the edge of Justworks' underwriting appetite. Below that line Justworks is usually the simpler, cheaper answer. Above it, or in regulated and higher-hazard work, ADP TotalSource has depth Justworks does not claim. We broker 36 PEOs and place companies with both, so what follows comes from quotes, not marketing pages.
ADP TotalSource vs Justworks at a glance
| Dimension | ADP TotalSource | Justworks |
|---|---|---|
| Best fit | Mid-size and multi-state employers, regulated industries, firms wanting Fortune 500 benefits | Startups, tech and remote teams, founders wanting simplicity and transparent pricing |
| Company size sweet spot | 50 to 500 employees, sweet spot 75 to 200 | 5 to 150 employees, sweet spot 10 to 75 |
| Pricing model and posture | Percentage of payroll (typically 2 to 4%) or PEPM, quoted not published. $150 to $250 per employee per month | Flat PEPM, published tiers. $59 to $109 per employee per month |
| Service model | Call-center pods rather than dedicated reps, consistency varies by region | Strong support ratings, lighter on deep HR consulting |
| Benefits | Fortune 500-quality plans, deepest buying power of any PEO by worksite employees | Solid small-company plans, verify availability in your states |
| Workers comp | Comfortable with complex and regulated environments, including manufacturing | Declines high-risk classes such as heavy construction and some manufacturing |
| Technology | Deep HR platform, broad module coverage | Modern platform employees like, limited custom reporting, no performance or LMS modules |
| Compliance depth | Industry-leading infrastructure, strong multi-state payroll and tax management | Fine for straightforward employers, lighter than mid-market PEOs |
| Contract flexibility | Annual contracts standard, early termination fees, terms tend to be rigid | Month-to-month available, annual discount offered |
| CPEO / ESAC | CPEO yes, ESAC accredited | CPEO yes, ESAC accredited |
Which is cheaper, ADP TotalSource or Justworks?
This is the cleanest difference between the two. Justworks uses a flat PEPM model and publishes it, which is genuinely unusual here: you can model your cost before you ever speak to a salesperson. Published tiers run about $59 to $109 per employee per month. ADP TotalSource prices as a percentage of payroll, typically 2 to 4%, or alternatively as a PEPM figure, with typical cost in the $150 to $250 per employee per month range. Its rates are quoted per client, not published.
The structure matters more than the headline figures. Percentage-of-payroll pricing means your fee rises every time you give a raise or hire at a higher band, even though the PEO does the same amount of work. When we place clients with ADP TotalSource we negotiate hard for flat per-employee pricing instead. On the other side, Justworks' cost advantage erodes past roughly 50 to 100 employees, so a company approaching that range should run both models out over three years rather than compare one invoice.
Contract terms follow the same pattern. ADP TotalSource uses annual contracts as standard, early termination fees apply, and terms tend to be rigid. Justworks offers month-to-month with an annual discount if you commit. If you expect a funding event, an acquisition or a move to in-house HR within a year or two, that flexibility is worth paying for. Either way, get the full fee schedule in writing and ask how renewal increases are handled.
How do ADP TotalSource and Justworks compare on benefits and workers comp?
Benefits are ADP TotalSource's strongest card. As the largest PEO in the US by worksite employees, it aggregates enormous buying power and offers access to Fortune 500-quality benefit plans. For a 120 person company recruiting against large employers, that can be the whole reason to sign. Justworks delivers respectable small-company benefits but is not competing on plan depth, and we tell clients to verify plan availability in their specific states before committing.
Workers comp is where underwriting appetite decides the conversation for you. Justworks will not write certain high-risk classes, including heavy construction and some manufacturing, so if those class codes describe your workforce it may simply decline, and negotiating does not change that. ADP TotalSource is highly experienced with complex regulatory environments and counts manufacturing among its core industries, so it is the realistic option for hazard-heavy payrolls. For a software company with everyone at a desk, the distinction is irrelevant.
How do ADP TotalSource and Justworks compare on service and technology?
Neither provider gives you the classic dedicated-HR-business-partner model, but they miss it in different directions. ADP TotalSource delivers service through call-center pods rather than a named rep, and consistency varies by region: deep specialist benches behind you, and sometimes the feeling of dealing with a large corporation. Justworks earns strong support ratings and is easy to deal with day to day, but is lighter on HR consulting. If you need someone to sit with you through a reduction in force or a compensation redesign, that is not its strength.
On technology both are credible and again differ in shape. ADP TotalSource runs a deep HR platform with broad module coverage, which is what you want for custom reporting, layered approvals and integration with a wider finance stack. Justworks runs a modern, intuitive platform employees genuinely like, which reduces the support load on whoever owns HR at a small company. Its gaps are specific: limited custom reporting, and no robust performance or LMS modules. If reviews and learning management are on your roadmap, plan to buy those separately.
Which handles multi-state compliance better, ADP TotalSource or Justworks?
Both are certified PEOs and both hold ESAC accreditation, which settles the two questions a careful buyer should ask of any PEO: federal tax certification and financial assurance. Past that baseline the depth differs. ADP TotalSource has industry-leading compliance infrastructure, strong multi-state payroll and tax management, and long experience in complex regulatory environments. For an employer with people in a dozen states, that bench is the product.
Justworks handles multi-state employment competently and is strong for remote and distributed teams, meaning employees scattered across many states doing low-hazard work. What it does not offer is mid-market consulting depth. That is a fair trade for a 30 person startup with remote engineers, and thinner for a 200 person company with hourly staff, meal-and-rest-break exposure or a union relationship. Be honest about which describes you: compliance is where a mismatch costs the most and shows up the latest.
When is ADP TotalSource the better choice?
Choose ADP TotalSource when your headcount sits in the 75 to 200 range and you recruit against large employers: the benefits buying power is the clearest advantage on the table and candidates notice it. Choose it when you operate in multiple states with real complexity, not just remote workers, or when you are in a regulated industry, healthcare, finance, legal or manufacturing among them, and want compliance infrastructure rather than compliance software. And choose it when your workers comp classes include work a startup-focused PEO will not write.
Accept the tradeoffs honestly. Percentage-of-payroll pricing gets expensive as salaries grow, contract terms tend to be rigid, implementation can be slow, and service comes through pods rather than a person who knows your business. If you are under 10 employees, need month-to-month terms or are buying primarily on price, this is not your provider.
When is Justworks the better choice?
Choose Justworks when you are a startup or early-stage company that wants to stop thinking about HR. Choose it when you want to model costs without a sales call: published flat per-employee pricing removes an entire negotiation. Choose it when your team is remote or distributed and mostly at desks, because the platform is built for that and employees like using it. And choose it when contract flexibility matters more than plan richness, since month-to-month is available with an annual discount if you later want the better rate.
Its limits are equally clear. It will not write heavy construction or some manufacturing, custom reporting is limited, and there are no robust performance or LMS modules. It is not the right home for a company over 200 employees or one needing deep HR consulting. If you are 40 people today and planning to be 150 in two years, model the whole journey before you sign.
What are the alternatives to ADP TotalSource and Justworks?
If ADP TotalSource prices too high and Justworks is too light or declines your class codes, the middle of the market is where most of these searches end up. TriNet is an alternative to both, worth a quote when you want industry-tailored plans at mid-market scale. Insperity is the one to add when service depth matters more than the lowest fee, and Rippling belongs on the list when platform and integrations drive the decision. Our free comparison quotes the whole panel, all 36 PEOs, not just the names you already know. See also ADP TotalSource alternatives, Justworks alternatives, and our best PEOs rundown.
Can you switch from ADP TotalSource to Justworks, or back?
What carries over is less than people expect. Employees, pay rates and payroll data move cleanly. Benefit plans do not: each PEO sponsors its own, so moving means full re-enrollment and, usually, deductibles reset unless the incoming carrier credits them. Switch mid-year and employees receive two W-2s, one from each employer of record, which is normal but needs explaining first. A 401(k) move typically involves a blackout period, and workers comp loss runs follow you and get re-underwritten. Check your existing agreement too: ADP TotalSource uses annual contracts with early termination fees, so timing the exit is worth real money.
On timing, plan for four to eight weeks from a signed agreement to the first PEO-processed paycheck. Most of that window is data collection and enrollment: census, pay history, state tax registrations, loss runs and plan documents. Quarter ends are the cleanest cutover points and January 1 is cleanest of all, which is why year-end queues are longest. Our PEO switching service walks through the sequence, and an audit of your current agreement will tell you what the exit actually costs.
Have quotes from both, or want them? Get a free side-by-side of ADP TotalSource, Justworks and the other PEOs that fit your company →
FAQ
Is ADP TotalSource better than Justworks?
Neither is better in the abstract. ADP TotalSource wins if you have 50 to 250 employees, operate across multiple states, need Fortune 500-quality benefit plans, or work in a regulated industry. Justworks wins if you are a startup or small team that wants transparent flat per-employee pricing, a modern platform and month-to-month flexibility. The question is which profile matches your company, not which brand is stronger.
Which is cheaper, ADP TotalSource or Justworks?
At small headcounts Justworks is usually cheaper and easier to predict: published flat pricing of roughly $59 to $109 per employee per month depending on tier. ADP TotalSource prices as a percentage of payroll, typically 2 to 4%, or as a PEPM figure, with typical cost around $150 to $250 per employee per month. Percentage-of-payroll fees rise every time you raise salaries, so ADP TotalSource gets more expensive as payroll grows. Justworks' own cost advantage erodes past roughly 50 to 100 employees, so the gap narrows as you scale. Compare real quotes rather than list figures.
Can I switch from ADP TotalSource to Justworks mid-year?
Yes, and the reverse works too, but a mid-year move has consequences. Employees receive two W-2s for the year, one from each PEO, because each is the employer of record for part of it. Health and ancillary plans restart, so everyone re-enrolls and deductible progress generally resets unless the new carrier gives credit. A 401(k) transfer usually involves a blackout period. Check ADP TotalSource contract terms first: annual contracts are standard and early termination fees apply.
How long does it take to switch to a new PEO?
Plan on four to eight weeks from a signed agreement to the first PEO-processed paycheck. Most of that window is data collection and benefits enrollment: employee census, pay history, state tax registrations, workers comp loss runs and current plan documents. Quarter boundaries are the cleanest cutovers, and January 1 is cleanest of all, which is why implementation queues are longest at year end.
What hidden costs should I watch for in a PEO agreement?
The ones that most often get missed are one-time implementation or setup fees, payroll-related charges (off-cycle runs, manual checks, amended filings, custom reports), minimum monthly fees, termination fees and early-exit penalties, year-end processing fees, HR project fees, state registration fees, and benefits administration charges. Renewal increases are the biggest one: attractive first-year pricing can climb at renewal, so ask in writing how renewals are handled. The defense is simple: request a full fee schedule and a sample invoice before signing, and ask the provider to identify every charge that could apply to your company.
Will Justworks take a construction or manufacturing company?
Often not. Justworks declines certain high-risk classes, including heavy construction and some manufacturing, so a company with those class codes may not get an offer. ADP TotalSource is used to complex and regulated environments and is the more realistic option there. If the workers comp loading comes back unattractive, quote PEOs that specialize in your risk class rather than negotiating with the two you started with.
The practical takeaway
Treat this as a fit decision, not a brand decision. Count your employees, look at your class codes and average salary, and ask how much HR consulting you need. A 35 person software company wanting predictable costs and a platform people like should start with Justworks and our Justworks review. A 150 person multi-state employer in a regulated industry should start with ADP TotalSource and our ADP TotalSource review, then negotiate flat per-employee pricing instead of a percentage of payroll. If you are in the middle, which most companies are, answer a few questions and we will put both quotes next to the rest of the panel at no cost to you.