The Series A/B benefits stack: what to offer, what it actually costs, and what employees actually use

The benefits conversation at a startup tends to happen twice. The first time is during the seed round, when someone realizes you need health insurance to hire engineers and you buy whatever your PEO recommends. The second time is around Series A or B, when the cost has tripled, employees are complaining, and someone — usually a recently hired ops lead — is asking why you offer FSAs that nobody uses but no parental leave policy that anyone can find.

This post is for that second conversation.

The goal: a clear-eyed view of what a competitive benefits stack looks like at Series A and B, what each component actually costs, and — the part most articles skip — what your employees will actually use. Because the difference between a good benefits package and an expensive one comes down to picking the things employees value and skipping the things that look good on a recruiting page and sit unused.

The components of a Series A/B benefits stack

There are roughly nine components to think about. We’ll go through each: what it is, what it costs, and what we recommend.

1. Health insurance (medical, dental, vision)
2. 401(k) and employer match
3. Disability and life insurance
4. FSA, HSA, and commuter benefits
5. Paid time off and holidays
6. Parental leave
7. Equity compensation
8. Stipends (home office, wellness, learning)
9. PEO vs. group plan vs. individual stipend — the structural choice

The structural choice in #9 frames everything else, so we’ll start there.

The structural choice: PEO vs. group plan vs. individual stipends

Before you pick benefits, you pick the chassis they sit on. There are three real options, and the choice matters more than any individual benefit decision.

Option 1: PEO (Professional Employer Organization)

A PEO co-employs your team, which means you get access to large-group benefits rates because you’re pooled with the PEO’s other clients. Justworks and TriNet are the two we see most often. The pitch is simple: better benefits, simpler administration, lower per-employee cost than you could get on your own at small scale.

When it works: 5-50 employees, single or low-state-count footprint, founders who want to outsource HR compliance without thinking about it.

When it stops working: above ~50 employees, when the math flips. PEO fees (typically 2-4% of payroll or $150-200 per employee per month) start to exceed what you’d pay for a direct group plan. Also, PEOs often don’t integrate cleanly with modern payroll/HRIS stacks, which creates the reconciliation problems we covered in how to administer payroll and 401(k) plans at a startup.

Option 2: Direct group plan via a broker

You contract directly with insurance carriers (typically through a broker like Newfront, Sequoia, or a regional firm), and you run benefits through your own payroll stack. This is the right answer for most Series A and B companies at 25+ employees.

When it works: 25+ employees, multiple states, you have a Rippling or Gusto stack that handles deductions cleanly, and you want full control over plan design.

What it costs: roughly $400-900 per employee per month for medical alone, depending on plan generosity, geography, and demographics. Brokers are typically paid commission by the carrier, not by you — which is fine but worth understanding when they recommend plans.

Option 3: Individual stipends (ICHRA or just cash)

You give employees a fixed monthly stipend (typically $400-700) and let them buy their own coverage on the individual marketplace. An ICHRA (Individual Coverage HRA) is the tax-advantaged structure for doing this.

When it works: fully-remote teams across many states, or companies that want to opt out of the group-plan complexity entirely.

When it doesn’t: most startups, honestly. Recruiting is harder (“we don’t offer health insurance, we give you money to buy your own” doesn’t land as well as it sounds in theory), and employees are often worse off because they lose group-plan negotiating power.

Our recommendation: Start on a PEO if you’re under 25 employees. Plan the migration to a direct group plan when you cross 25 or hit your next major fundraise. Don’t do ICHRA unless you have a specific reason — the recruiting friction usually isn’t worth the operational simplicity.

Health insurance: what to offer, what it costs

Health insurance is the single largest line item in any benefits stack — typically 60-75% of total benefits spend. Three things matter most: plan design, employer contribution, and what dependents cost.

Plan design. Most startups offer two or three plan options: a PPO (more expensive, lower deductible, broader network) and an HDHP-HSA (lower premium, higher deductible, paired with an HSA). Offering both gives employees agency. Offering only one — particularly only an HDHP — saves money but signals cost-cutting to candidates.

Employer contribution. The benchmark for Series A/B startups is 80-100% of the employee premium and 50-75% of dependent premiums. Going below 80% on the employee side becomes a recruiting issue; 100% is generous but increasingly common in competitive markets.

Dependent coverage. This is where benefits costs explode quietly. A single employee might cost the company $600/month for medical. That same employee with a spouse and two kids might cost $2,000-2,500/month. The dependent contribution policy you set has a much larger impact on total benefits cost than the plan tier you pick.

What it costs, all-in: For a Series A startup with ~50 employees, expect $400-700 per employee per month for medical alone (employer cost). Dental and vision combined typically add $40-80 per employee per month. So roughly $5,500-9,500 per employee per year for the full medical/dental/vision stack, before dependents.

401(k) and employer match

We covered the mechanics of 401(k) administration in detail in how to administer payroll and 401(k) plans at a startup. The benefits-strategy question here is what employer match to offer.

The market benchmark for startups: A 4% safe harbor match is the most common structure. The math is simple: if an employee contributes 5% of salary, you match the first 4% dollar-for-dollar. Safe harbor structures auto-satisfy IRS nondiscrimination testing, which means you don’t have to give back employer contributions to highly-compensated employees if rank-and-file participation is too low.

What it actually costs: Roughly 2-3% of payroll, since not every employee defers enough to capture the full match. For a 50-person team with average salary of $150K, that’s $150K-225K per year in employer match — meaningful but not prohibitive.

What we recommend: Offer a 4% safe harbor match from day one if you can. The recruiting signal it sends is large and the cost-per-recruiting-win is low. Use Guideline if you’re under 100 employees; Vestwell if you have specific plan design needs.

A note on vesting: Safe harbor matches must be immediately vested. You don’t get to graded vest a safe harbor. If you want graded vesting, you’re in non-safe-harbor territory and you’re testing every year. Not worth the complexity at this stage.

Disability and life insurance

These three lines — short-term disability, long-term disability, and basic life insurance — cost almost nothing relative to their recruiting value.

Short-term disability (STD): Covers 60-70% of salary for up to 12 weeks for employees who can’t work due to illness or injury. Cost: roughly $20-40 per employee per month.

Long-term disability (LTD): Covers a portion of salary (typically 60%) for extended absences beyond STD. Cost: $30-50 per employee per month.

Basic life insurance: 1-2x annual salary, payable to a designated beneficiary if the employee dies. Cost: $10-25 per employee per month at typical Series A/B demographics.

What we recommend: Offer all three, employer-paid. Total cost: about $60-115 per employee per month, or $720-1,400 per year. This is one of the highest-ROI benefits you can offer in terms of recruiting value per dollar spent. Skip it and you’ll see it come up in glassdoor reviews.

FSA, HSA, and commuter benefits

These are tax-advantaged employee-funded accounts. The administrative cost is small; the employer cost is essentially zero (the employee funds them). What they do is reduce the employee’s tax burden, which improves take-home pay.

HSA (Health Savings Account): Available only if the employee is enrolled in an HDHP. Employees can contribute pre-tax dollars (2026 limits: $4,300 single / $8,550 family). Money rolls over forever and grows tax-free. The IRS-blessed best retirement account in existence, frankly. Many startups offer a small employer HSA contribution ($500-1,500/year) to encourage HDHP enrollment.

FSA (Flexible Spending Account): Available regardless of medical plan. Employees can contribute pre-tax dollars (2026 limit: $3,300) for medical expenses. Use-it-or-lose-it within the plan year, which is why participation is often lower than HSA.

Commuter benefits: Pre-tax dollars for transit and parking (2026 limit: $325/month each). High-value for employees in high-cost transit cities (NYC, SF, DC, Chicago). Largely irrelevant for fully-remote teams.

What we recommend: Offer HSA, FSA, and commuter benefits. The cost to administer is minimal (Rippling, Gusto, and most payroll providers bundle this). The take-home-pay improvement for employees who participate is real. Skip a small employer HSA contribution if you’re cost-sensitive; offer one if you want HDHP enrollment to actually happen.

Paid time off and holidays

The PTO conversation has shifted in the last five years. Two structures dominate.

Unlimited PTO. The “modern” approach. Employees take what they need within reason. The reality at most startups: employees take less PTO under unlimited policies, not more, because there’s no defined amount and the social pressure to not take time creeps in. The accounting benefit is real, though: no PTO liability accrues on the balance sheet, which auditors and acquirers appreciate.

Accrued PTO. Employees earn a set number of days per year (typically 15-25 plus separate sick leave). PTO accrues, vests, and is paid out at termination in most states. This creates a real balance sheet liability — a meaningful one. A 50-person company with 20 accrued PTO days each, average $200K salary, has roughly $400K of PTO liability sitting on the books at any given time.

What we recommend: Either is defensible. Unlimited PTO is cleaner accounting and signals trust; accrued PTO is more equitable in practice because it forces leadership to actually take time. If you go unlimited, set a minimum (e.g., “everyone must take at least 15 days”) to counteract the under-use pattern. If you go accrued, plan for the liability and know that some states (California, for example) require accrued PTO to be paid out at termination regardless of policy.

Holidays: 10-12 paid holidays per year is the U.S. norm. Many startups add a “winter break” week between Christmas and New Year’s — increasingly expected at this stage.

Parental leave

Federal law (FMLA) requires 12 weeks of unpaid leave for employees at companies over 50. Some states (California, New York, New Jersey, Washington, Massachusetts, others) require paid parental leave at the state level. Beyond legal minimums, parental leave policy is one of the most-scrutinized parts of a benefits package — particularly for senior hires in their 30s.

The benchmark for competitive Series A/B startups: 12-16 weeks fully paid for the primary caregiver, 6-12 weeks fully paid for the secondary caregiver. Gender-neutral language (primary/secondary, or just “parental leave” with a single duration).

What it costs: Less than you’d think on a steady-state basis, since usage is intermittent. For a 50-person company, expect 2-4 parental leaves per year on average. The direct cost is the salary continuation; the indirect cost is the productivity loss, which is real but absorbed.

What we recommend: 12 weeks fully paid for all parents (primary or secondary), gender-neutral. Below 12 weeks reads as cost-conscious in recruiting. Above 16 weeks is generous but expected in some markets.

Equity compensation

This is its own universe and we cover it in detail in Equity compensation 101 and Equity refresh grants. For the purposes of this benefits-stack post, three things matter:

1. Every full-time employee should get equity. Not just engineers, not just senior hires. The fact that the company is venture-backed and employees share in the upside is foundational to the social contract of working at a startup.
2. The grant structure should be standardized. Have a published equity band by role and level. Negotiating equity ad-hoc with every hire creates inequity, distrust, and operational chaos.
3. The 4-year vesting / 1-year cliff is still the standard. Some startups are experimenting with shorter vesting (3-year), longer (5-year), or no-cliff. The 4-year/1-year is what employees and recruiters expect; deviate from it deliberately, not by accident.

Stipends

The newest entrants in the benefits conversation. Stipends are fixed monthly or annual amounts employees can spend on a defined category.

Home office stipend: $500-2,000 one-time or $50-100/month. Most relevant for remote-first companies. Critical for getting people set up with monitors, chairs, and headsets that don’t ruin their backs.

Wellness stipend: $50-150/month. Covers gym, fitness apps, mental health subscriptions. High perceived value for low cost.

Learning & development stipend: $500-2,000/year. Books, courses, conferences. The cheapest retention investment you can make.

What we recommend: Offer a meaningful home office stipend for remote employees ($1,000+ one-time setup, plus $50-75/month ongoing). Wellness and L&D stipends are nice-to-haves; offer them if budget permits but they’re not table stakes. Watch out for taxable-vs-nontaxable rules — most cash stipends are taxable wages, which surprises employees if not communicated.

What employees actually use

Five years of building these stacks at venture-backed startups produces a pretty consistent pattern of what gets used vs. what looks good on a recruiting page.

Heavily used: Health insurance (everyone), 401(k) match (60-80% of employees enroll, higher with auto-enrollment), parental leave (whoever needs it, fully), HSA among HDHP enrollees (40-60%), home office stipend at remote companies (nearly 100%).

Moderately used: FSA (15-30% participation; most don’t bother with the use-it-or-lose-it), commuter benefits (varies wildly by city), wellness stipend (30-60% if it’s broadly defined; lower if narrowly defined).

Underused: L&D stipend (often under 30% utilization despite high perceived value), gym-specific wellness (much lower than broadly-defined wellness), legal/financial counseling benefits (under 10%).

Used heavily by a small minority: Mental health benefits (life-changing for the 10-15% who use them, invisible to everyone else), fertility benefits (high-value for a small employee population, increasingly expected by senior hires).

The lesson: spend benefits dollars where utilization is high (health, 401(k), parental leave, home office) and stop trying to optimize for the long tail. A great benefits package is a deep one in the big categories, not a thin one with a dozen creative perks.

The total cost of a competitive Series A/B benefits stack

Pulling it all together, here’s what a competitive benefits package costs per employee per year at Series A/B:

Add dependents (medical/dental/vision for employees with families) and the number climbs another $5,000-12,000 per affected employee.

A reasonable planning number for a Series A/B startup: $18,000-24,000 per employee per year in total benefits cost, with significant variation based on geography, demographics, and plan generosity.

When to bring in operator support

Benefits design is one of those areas where a few hours of experienced input prevents years of expensive mistakes. The benefits package you set at Series A becomes harder to walk back than to walk forward — once you’ve offered 16 weeks of parental leave, taking it down to 12 is a morale event.

You probably don’t need outside help if you’re under 15 employees and on a PEO. The PEO’s design is mostly the design.

You likely want operator input if you’re:

• Crossing 25 employees and migrating off a PEO
• Designing equity compensation for the first time, or expanding it (refresh grants, RSUs, longer vesting)
• Preparing for a Series B raise and want benefits to read as “company that pays competitively” to senior hires you’re trying to recruit
• Inheriting a benefits package built by someone else and wanting to know what’s broken
• Going through M&A and trying to harmonize benefits across acquired entities

Pegacorn Group works with venture-backed startups on exactly these problems. If you want a benefits package that recruits the people you’re trying to hire, runs cleanly through your payroll stack, and doesn’t quietly drain $50K/year on benefits nobody uses — let’s talk.

This post pairs with: How to administer payroll and 401(k) plans at a startup, Equity compensation 101: ISOs, NSOs, RSUs, and The 25-employee threshold: every law and obligation.