In-House vs Outsourced Payroll: How to Tell Which One Your Company Actually Needs

In-house payroll usually fits stable, single-state operations under about 50 employees with a tenured bookkeeper who already knows the workforce. Outsourced payroll usually fits multi-state, growing, or compliance-heavy operations where the math, the state filings, and the year-end reconciliations have outgrown one person’s calendar. The decision is about volatility and complexity, not company size.

I’m Mike. I run finance and HR placements at KORE1’s payroll outsourcing and back-office practice. We’re not a payroll vendor. We don’t sell software, we don’t run payroll for anyone. What we do is staff the people on either side of this decision, which means we see two things vendor blogs don’t. We see the in-house payroll specialist who lands on our desk three weeks after a client outsourced. And we see the company that rushed the switch in October and broke their year-end. Both happen often enough that I have opinions about when each version of this is right. Bias disclosed: we benefit when companies need to fill payroll roles, and we benefit when companies need help during a transition. Neither side sells you software.

The Honest Version of the Question

Most posts on this topic frame it as in-house versus outsourced, pros and cons, pick one. That’s the wrong frame. The actual question is what changes about your business when you switch, and whether your business is in a place where it can absorb the change without something cracking.

Switching payroll is not a software upgrade. It’s a personnel decision, a process decision, a vendor relationship decision, and a year-end accounting decision all stacked into the same calendar quarter. Most clients don’t see that until they’re inside it.

What follows is the version of this conversation I have with clients in person, with the parts that get them to a real decision left in and the parts that would feel like a sales pitch taken out, because we don’t sell payroll software and have no incentive to push you one way.

What In-House Payroll Actually Looks Like in 2026

In-house payroll means your own employees process payroll runs, file payroll taxes, handle wage garnishments, run year-end W-2s, and own the relationship with the IRS and your state revenue agencies directly. You buy software to do the math (QuickBooks Payroll, Sage, OnPay, Patriot, or a step up like Paylocity). You keep the headcount and the liability inside the company.

The visible cost is the salary line. The U.S. Bureau of Labor Statistics puts the median annual wage for payroll and timekeeping clerks at $50,420 (May 2024), with the top 10% above $72,000. A dedicated payroll specialist with five-plus years of multi-state experience and a working knowledge of California wage-and-hour rules, garnishment processing, and at least one ERP integration runs $68,000 to $82,000 depending on metro, with Bay Area and New York comping at the top of that range and most other markets sitting somewhere in the middle. Add 22 to 30 percent in benefits and payroll taxes for the loaded number. Add software ($1,200 to $6,000 a year for SMB tools, more for mid-market). That’s the spreadsheet version.

The version that actually plays out in most small companies looks different. Most sub-50-person businesses don’t have a dedicated payroll person. They have an office manager or a controller who owns payroll on top of accounts payable, accounts receivable, vendor management, and whatever else. Payroll lives in the corner of someone’s job. It works fine right up until that person takes vacation, gets sick, or leaves.

One of our clients last year was a 35-person manufacturer in Anaheim. Their office manager had run payroll on QuickBooks for nine years without a hiccup. She went on FMLA in March. The CFO covered for her, missed a state UI filing in two weeks, and the company ate $1,840 in penalties before anyone noticed the notice. The software was fine. Everything was wrong with the bus factor.

That’s the in-house cost line that nobody books. It’s not in the software bill. It’s in the bench depth.

What Outsourced Payroll Actually Looks Like

Outsourced payroll means a third party — a payroll bureau, a SaaS provider with managed service, a boutique back-office firm, or a PEO — runs your pay cycles, files your taxes, and (in most arrangements) takes liability for errors on their end. You hand them hours, new hires, terminations, and exception items. They hand you paystubs, tax filings, and a quarterly invoice.

The market splits roughly four ways:

• Full-service traditional bureaus — ADP, Paychex. Strong compliance, deep US coverage, dedicated rep at higher tiers, complex pricing.
• SaaS-first with managed support — Gusto, Rippling, OnPay. Easier UI, faster onboarding, less hand-holding for unusual situations.
• Boutique managed providers — including outfits like KORE1’s payroll partners and regional CPAs. High-touch, smaller client lists, more flexible on weird situations like union shops or commission-heavy comp plans.
• PEOs — TriNet, Insperity, Justworks. Different category. They co-employ your workforce on their tax ID, which is a bigger commitment than payroll outsourcing alone. Worth its own conversation.

Pricing is reasonably consistent across the first three categories. Plan on $4 to $12 per employee per pay period plus a base fee of $40 to $150 a month, with implementation fees that range from waived to a few thousand dollars depending on complexity. PEOs run different math entirely, usually 2 to 12 percent of total payroll, sometimes plus a per-employee fee on top, and the wide range exists because the actual cost depends almost entirely on what benefits package you opt into and which states your employees live in.

The thing the brochures don’t market is that the handoff is messier than the sales call. The first 60 days of a new outsourced payroll relationship usually involve at least one wrong direct deposit, one missed garnishment, and one panicked Slack message at 4:55 on a Friday. It smooths out. Not seamless though. The vendor reps who promise a clean cutover are the same reps who disappear once the contract is signed and the implementation team takes over.

Side by Side, the Way the Decision Actually Feels

Here’s the comparison the way I’d lay it out for a client at lunch. The numbers assume a 40-employee company in California, single-state, with one payroll cycle every two weeks.

Look at the cost row. On paper outsourced wins by $63,000 a year. On paper. The reason that number is misleading is that the in-house cost includes a real human who does other work too. The outsourced fee doesn’t replace that human. It just removes the payroll piece of their job. So the comparison only matches reality if you’re actually planning to eliminate the headcount, or if payroll is genuinely the only thing they do. For most small companies, neither is true.

Four Scenarios Where In-House Still Wins

Every other post you’ll read on this topic skips this section. I’m putting it first because it’s the part most companies need to hear.

The single-state, stable, tenured-bookkeeper shop. If you have 30 to 60 employees, operate in one state, your headcount hasn’t moved more than 10 percent in two years, and the same person has run payroll for five-plus years without a serious mistake on a system that integrates cleanly with your accounting software, leave it alone. The juice isn’t worth the squeeze. You’re not going to save real money after you account for what your bookkeeper still has to do, and you’ll create switching risk for no payoff.

The construction shop with certified payroll. Federal Davis-Bacon and state prevailing wage filings are their own world. Most general payroll providers either don’t handle them well or charge a steep premium for the module. If you’re a small to mid-size contractor running prevailing wage jobs, the in-house person who already knows your union locals, your fringe rates, and your WH-347 forms is worth more than the savings on a SaaS bill. We have a separate post on certified payroll in construction if that’s your situation. Also worth looking at construction payroll services if you do want to outsource that specific case to a vendor who actually specializes in it.

Are you mid-acquisition? Don’t switch payroll. PE-backed companies in the middle of a bolt-on, a recap, or a sale process should not be moving payroll at the same time, because the buyer’s quality-of-earnings team will pull twelve months of payroll data and any inconsistency between the old system and the new one becomes a question that has to be answered in writing. Diligence teams hate it, the data room gets messier, and any error during the transition creates a question that lands on the deal lawyer’s desk and slows the close. Wait until after.

The 8-person services firm. At very small headcount the math flips back. QuickBooks Online Payroll runs about $50 a month plus $6 per employee. Total annual cost: roughly $1,200. Your bookkeeper spends maybe an hour a week on it. Outsourcing to a managed provider doesn’t pay back.

Four Scenarios Where Outsourcing Is Already Overdue

Flip side now. These are the situations where I tell clients, in plain language, that the dragging-of-feet has gone on long enough and the in-house setup is creating more risk than it’s saving.

You’re hiring across state lines. The moment you hire your second remote worker in a new state, in-house payroll compounds in difficulty. Each state has its own withholding rules, its own UI rate calculation, its own quarterly filings, its own new-hire reporting. By the third state, your bookkeeper is googling things during payroll runs, which is the moment errors start. Corporate payroll services handle this complexity by default — it’s the entire reason the category exists.

You crossed 50 employees and you still don’t have a dedicated payroll person. At 50 the IRS and ACA reporting starts to bite. At 100 you’re filing 1095-Cs and answering questions about full-time-equivalent calculations. Without a dedicated owner, things start slipping. The slip looks small until the year-end notice arrives.

Last year you filed an amended 941. Or two. If your payroll process is producing amendments, that’s the system telling you it’s running too hot. One amended return per year is an unlucky quarter. Two is a pattern. Three is a problem the IRS will eventually notice.

Your payroll owner is also your HR owner is also your benefits administrator. We see this constellation more than any other. One person carries three jobs because each one alone doesn’t justify a full-time hire. The math feels efficient. It isn’t. According to the IRS employment tax guidance, employers face penalties starting at 2 percent for deposits 1-5 days late and climbing to 15 percent on amounts still unpaid 10 days after first notice. One missed deposit on a $40K payroll run is a $6,000 penalty. The “savings” from not outsourcing evaporates in one mistake.

The Switching Cost Nobody Talks About

If you decide to outsource, here’s what actually happens in the first quarter, in the order it actually happens.

Weeks 1-2 are vendor selection and contract negotiation. Plan on three vendor demos, a back-and-forth on pricing, and at least one round of legal review. Weeks 3-6 are implementation: data migration from your existing system, employee record cleanup (you will discover at least four employees with stale W-4s and one with a wrong SSN), tax registration handoffs, and bank account setup for ACH. Weeks 6-8 are parallel runs. You run payroll both ways for one or two cycles to make sure the new provider matches the old numbers exactly. They won’t, the first time. They’ll be off by something small that traces back to a benefit deduction nobody documented properly. You fix it. You run it again. It matches.

Then there’s the people side. If your in-house payroll specialist’s job was 80 percent payroll, that role is now mostly gone. Some companies redeploy the person into broader HR or finance work. Some don’t, and the role gets eliminated. We’ve placed several payroll specialists who landed on the open market this way over the last two years, mostly into broader controller or HR-generalist roles where their compliance background gave them an edge over candidates from a pure accounting track. Most found roles within 60 days, but the company that let them go had to pay severance, manage the transition awkwardly, and explain the move to the rest of the staff during a stretch when the new vendor was still missing things. None of that is in the cost comparison either.

Don’t switch in October. I’ll say it twice because it’s the single most expensive timing mistake we see. Don’t switch in October. Year-end W-2s will be split across two systems and at least one of them will produce a wrong number. We had a client switch on October 14 last year because the new vendor offered three months free if they signed before Q4. They saved roughly $4,500 on the contract and paid roughly $11,000 in accountant time fixing the year-end reconciliation in February. Switch in January, or wait until next January.

How to Run the Math Yourself

Forget the calculators on vendor websites. They’re rigged. Here’s the real comparison for a 40-person, single-state company.

In-house total annual cost: loaded payroll specialist salary + software + an honest error allowance (figure 1-2 percent of total payroll for compliance risk if you don’t have a dedicated owner) + the opportunity cost of your bookkeeper’s payroll time at her loaded hourly rate. For a 40-person company that’s somewhere between $35,000 and $90,000 depending on whether you’re paying a dedicated specialist or splitting the work into someone else’s job.

Outsourced total annual cost: per-employee fee × employees × pay periods + monthly base fee × 12 + implementation fee amortized over 24 months + the soft cost of whoever on your team is going to own the vendor relationship, because someone always has to. For 40 employees, biweekly, mid-tier provider, that’s roughly $11,000 to $18,000 per year all-in once you’re past implementation.

If your in-house number is a dedicated specialist, outsourcing saves real money. If your in-house number is “the office manager spends six hours a week on it,” outsourcing doesn’t save money on paper, but it removes risk and frees up six hours of your office manager’s week for work that actually moves the business forward. Both of those are valid reasons to switch. Different reasons though. The clients who get burned are the ones who told themselves they were buying cost savings and were actually buying risk reduction, then got annoyed when the bottom-line number didn’t move much in year one.

If you want a deeper read on the operational case, our post on the benefits of outsourcing payroll for growing businesses walks through the cost-per-error data and the compliance numbers in more detail. Trying to figure out who you’d actually hire if you stayed in-house? Or backfill the function some other way? Talk to a recruiter on our team. We’ll tell you straight whether you need the role.

Things People Ask

Realistically, what does outsourced payroll cost for a 40-person company?

$11,000 to $18,000 per year all-in for a mid-tier managed provider, biweekly cycles, single state, no exotic comp structures. PEO arrangements run higher because you’re buying co-employment, not just payroll processing. Cheaper SaaS-only options exist below that range but the support level drops with the price.

Is a PEO the same thing as outsourcing payroll?

No, but the confusion is fair. A PEO co-employs your workforce on their federal employer ID, which means they’re handling payroll, but also benefits, workers’ comp, HR compliance, and the employer-of-record relationship for tax purposes. Outsourced payroll is just the payroll piece. PEOs cost more, lock you in tighter, and are harder to leave. They’re the right answer for some companies — usually small businesses that want to offer enterprise-grade benefits without building an HR function — and the wrong answer for others.

How long does the switch actually take from contract signature to first live run?

Six to eight weeks is realistic for a clean transition at a 40-person company. Add two weeks if you’re switching mid-quarter. Add four if you’re multi-state. Vendors will tell you four weeks. They mean four weeks of their work, not four weeks of total elapsed time including your team’s data cleanup, which is where the actual delay lives.

Who’s liable if the payroll provider files our taxes wrong?

Wrong question, slightly. The IRS holds the employer liable for the deposit and the filing — that part can’t be transferred contractually. What can be transferred is the financial responsibility for the error. Most reputable managed providers will accept liability for mistakes that originate on their end and reimburse the resulting penalties and interest, but only if the contract you signed actually says so in language that survives the ten-page indemnification section, which is something you have to verify line by line. Look for the “tax filing accuracy guarantee” clause. Missing? Make them add it.

Can we partially outsource — keep timekeeping in-house but outsource the rest?

Most providers prefer you don’t, because clean data flow is what makes their model work. That said, plenty of companies use a separate timekeeping system (Deputy, When I Work, Homebase) that integrates with the payroll provider via API. The provider runs payroll from the timekeeping data without re-keying anything. That’s not really partial outsourcing — that’s normal architecture. Pure partial outsourcing where you do the calculations in-house and send a file for tax filing only is rare and usually more expensive than just outsourcing the whole thing.

One More Thing

The companies that get this decision right almost never get it right by reading a comparison post. They get it right by being honest about which version of “in-house” they actually have. Is it a real specialist or is it the office manager filling in. Is your headcount stable or is it growing. Is your bench one person deep or three. Answer those first. The rest of the math follows.