Hiring Calculus: When a $90k FTE Beats a $120k

Solo founders making their first hire usually frame it as a salary-vs-rate comparison. That comparison is the wrong unit. The honest comparison is loaded cost per useful output hour, with retention, classification risk, and knowledge accumulation priced in. Done correctly, the answer is rarely the headline-rate winner.

What follows is the cost-math deep-dive within the hire-or-contract series: the load factors that separate the two structures, the productivity premium nobody books, and the typical break-even ranges drawn from BLS and SBA data. If you want the decision frame first, start with how to decide: hire or contract; the classification-and-tradeoffs side gets its own deep treatment in the honest 2026 walkthrough.

The headline-rate trap

A founder weighing a $90,000 FTE against a $120,000-equivalent contractor (say, $60/hour at 2,000 hours) sees a $30,000 cash gap and assumes the FTE is cheaper. That comparison ignores roughly $25,000 to $40,000 of employer-side costs that never appear on a contractor invoice.

The BLS Employer Costs for Employee Compensation (ECEC) data shows that benefits and legally-required contributions average about 29.6% of total compensation for private industry workers as of late 2024^[1]. For a $90,000 base salary, that ratio implies roughly $26,700 in employer add-ons before equipment, software, or office cost. The headline rate is missing about a quarter of the real number.

The fix is comparing total annual cash out of the business for each option, plus a productivity adjustment that reflects what the same dollar buys in output. Both adjustments matter. Skipping either produces the wrong hire.

Loaded cost of an FTE

The components, with typical US ranges for a salaried solo-founder hire at $90k base in 2024:

• Base salary. $90,000.
• Employer FICA match. 7.65% on the first $168,600 (Social Security wage base) plus 1.45% Medicare on the rest. On $90k base: $6,885^[4].
• Federal unemployment (FUTA). 0.6% on the first $7,000 of wages = $42 per employee, after the standard state credit.
• State unemployment (SUTA). Varies by state and experience rating. New employer rates run 2.0 to 4.5% on a wage base of $7,000 to $40,000+ depending on state. Typical first-year cost: $200 to $1,200.
• Workers' compensation insurance. Industry-class-rated. Office-based software work runs $0.20 to $0.80 per $100 of payroll. On $90k: $180 to $720.
• Health insurance contribution. Median employer contribution for single-coverage health plans is $7,034/year per Kaiser Family Foundation employer survey 2024. Family coverage runs $17,393. Solo founders rarely offer family coverage; budget $7,000 to $10,000 for single coverage at 70 to 80% employer contribution.
• Retirement plan contribution. A simple match (3% of salary, common for SIMPLE IRA): $2,700 on $90k.
• Paid time off. Two weeks vacation + standard holidays = roughly 4% of salary in unpurchased output, or $3,600 if priced as an opportunity cost.
• Equipment, software, and onboarding. Laptop ($2,000 amortized at $700/year), software seats ($1,000 to $2,500/year), training cost (variable, $500 to $2,000 first year).
• Payroll service and HR overhead. $40 to $80/month for one employee = $480 to $960. Plus accountant time on quarterly 941 filings.

Total loaded cost on a $90,000 base salary, conservative midpoint:

$90,000 + $6,885 + $42 + $700 + $400 + $8,000 + $2,700 + $3,600 + $1,500 + $700 = $114,527

That is a 27.3% load factor, consistent with the BLS ECEC ratio^[1]. SBA's small-business guidance suggests budgeting 25 to 40% above base for total cost^[2]; the lower end of that range covers a no-benefits hourly hire, the upper end covers a full benefits package with retirement match. Use the Contractor vs Employee Calculator with your own state SUTA rate and benefit tier to land on the correct number for your situation.

Loaded cost of a contractor

The contractor stack is shorter and the number rarely moves much above the headline rate:

• Hourly or project rate. The number on the invoice.
• Onboarding overhead. Typically minimal for project-scoped work. A specialized contractor lands in 1 to 5 hours at billable rate; an embedded contractor lands in 20+ hours of company context.
• Software access cost. Most contractors bring their own tools. Net cost to the company: $0 to $500/year for shared-platform seats.
• Tax form processing. 1099-NEC issued each January for any contractor paid $600+ in the year. Bookkeeping cost: roughly $50/year per contractor through standard accounting software.
• Misclassification risk reserve. If the IRS or state DOL reclassifies the contractor as an employee, the company owes back-FICA, back-FUTA, back-SUTA, and potentially overtime. The expected-value cost is small per contractor per year (~$200 to $500 reserve); the realized cost in a contested case is large (the Classification section covers the math).

For a $120,000 contractor (2,000 billable hours at $60/hr or a project-equivalent), total annual cost to the company is typically $120,000 to $122,000. The load factor is 1 to 2%, an order of magnitude below FTE.

The Team Salary Budget Calculator handles the multi-headcount version of this comparison once the first hire is settled and the second is in scope.

The productivity premium nobody books

The pure cash comparison is one half of the math. The other half is what each dollar buys in output. The productivity differences between FTE and contractor at the same loaded rate:

• Ramp time. A contractor specialized in your problem domain ships from week 2. An FTE ramps for 2 to 6 months on context, codebase, customer knowledge, and process. The productivity gap during ramp is real, varies by role complexity, and represents 3 to 8% of FTE first-year output value.
• Specialization premium. A senior specialist contractor pulls 20 to 50% more output per hour on their specific problem than a generalist FTE. For project-bounded work with clear scope, the multiplier favors the contractor.
• Knowledge accumulation. An FTE compounds context across years. By year 2, a generalist FTE often outproduces a specialist contractor on the same product because the FTE knows the full system. The contractor knows the slice they were hired for and resets each engagement.
• Continuity risk. Contractors leave on shorter notice and on their own terms. FTEs leave with 2 weeks notice typically, plus the social glue of full-time integration that makes departure less abrupt. Continuity gaps cost real money in handoff time and dropped balls.
• Availability and focus. A contractor billing 4 clients spends roughly 25% of their billable time on yours, even at fractional rates. An FTE spends 100% of available focus. For coordination-heavy work, the FTE's slack capacity (informal channels, ad-hoc help, cross-functional sync) is worth 10 to 20% of their loaded cost.

Pricing the productivity premium honestly is what flips the comparison. A contractor at $120k loaded who delivers 1.3x specialist output beats an FTE at $115k loaded delivering 1.0x baseline. An FTE at $115k loaded delivering 1.4x output by year 2 beats both, which is why year-2 break-even math leans hard toward FTE for core-product work.

Worked example: $90k FTE vs $120k contractor

Solo founder hiring a senior backend engineer for a SaaS product. Full-stack scope, US-based, employer is a single-member LLC with S-corp election in Texas (no state income tax, low SUTA). Two candidates evaluated head-to-head.

OPTION A: Hire as W-2 FTE at $90,000 base
  Year 1 loaded cost
    Base salary                    $90,000
    Employer FICA                   $6,885
    SUTA + FUTA (TX)                  $342
    Workers' comp                     $360
    Health insurance (single, 80%)  $5,600
    SIMPLE IRA 3% match             $2,700
    PTO (priced)                    $3,600
    Equipment + software            $3,200
    Payroll service                   $720
    Onboarding (3 mo ramp at 0.6x)  $11,000 (productivity gap)
    Total Year 1                  $124,407

  Year 2 loaded cost (no ramp gap)
    Same base costs                $113,407
    Productivity at 1.2x (compounding context)
    Effective cost / output unit    $94,500

OPTION B: Hire as 1099 contractor at $60/hr × 2,000 hrs
  Year 1 loaded cost
    Hourly billing                $120,000
    Onboarding (1 mo light ramp)    $1,800
    Software seats                    $400
    1099 processing                    $50
    Misclass risk reserve             $300
    Total Year 1                  $122,550

  Year 2 loaded cost
    Hourly billing                $120,000 (assumes rate flat)
    No ramp                             $0
    Productivity at 1.2x specialist multiplier
    Effective cost / output unit  $100,000

What the math shows:

• Year 1 cash out: FTE $124,407, contractor $122,550. Contractor wins by $1,857.
• Year 1 effective cost per output unit: Adjusted for the FTE's ramp drag, the contractor wins by about $5,000.
• Year 2 effective cost per output unit: FTE at $94,500, contractor at $100,000. FTE wins by $5,500.
• Two-year cumulative: FTE $218,907, contractor $222,550. FTE wins by $3,643.

The crossover happens late year 1 or early year 2, depending on how steep the productivity ramp is. For core-product work with 24+ month horizons, the FTE wins decisively. For 6-month project work, the contractor wins decisively. For 12-month engagements, the answer depends on ramp shape and how confident the founder is that the work continues into year 2.

Where the break-even shifts

Variables that move the break-even meaningfully:

• State tax and SUTA. California adds ~$1,800/year in employer taxes vs Texas. Massachusetts adds ~$1,200. The FTE comparison gets ~$1,000 to $2,500 worse in high-tax states.
• Health-insurance contribution. An employer offering family coverage at 80% contribution adds $14,000 to FTE loaded cost. Solo founders rarely offer this in year 1; growth-stage companies often do, which moves the FTE break-even up by $100k+ effective revenue per hire.
• Equity compensation. Stock options and RSUs are not "free" because dilution has a real cost to remaining shareholders. A 0.5% option grant on a $5M valuation is $25,000 of expected-value compensation on top of cash. That moves FTE total comp up but reduces cash burn, which matters more during fundraising windows.
• Contractor rate inflation. Contractor rates rise 5 to 8%/year in tight specialized markets vs 3 to 4%/year for FTE base salary. Year 3+ math often shifts back toward FTE on rate-inflation grounds alone.
• Work classification. If the work is genuinely project-scoped, the contractor structure is legally cleaner. If the work is core, ongoing, and integrated, the FTE structure removes classification risk that would otherwise be priced into the contractor option.

Pricing classification risk into the cost math

Classification has a dollar line in this comparison, so it belongs in the cost math even though the full legal framework lives elsewhere. The short version: a contractor who works full-time-equivalent hours, uses company tools, follows company process, has no other clients, and has been engaged for 12+ months is at substantial reclassification risk regardless of what the contract says^[3][5].

For the purposes of the cost columns above, the number that matters is the expected-value reserve and the realized-case downside. Realized cost in a contested case for a single misclassified worker over 24 months runs $15,000 to $40,000+ (back FICA/FUTA/SUTA, possible FLSA overtime, federal and state penalties). The expected-value reserve to carry while uncertain is roughly $300 to $500/year, which is the line item that already sits in the contractor column. If the reserve looks too small for your situation, that is a signal the work pattern does not fit a contractor classification cleanly.

For the actual IRS three-prong test, the 2024 DOL economic-reality factors, the penalty schedule, and how the risk should swing the call when the cost is close, see the classification-and-tradeoffs deep-dive: contractor vs employee, honestly (2026). This article keeps the focus on the cost arithmetic.

Common hiring-cost mistakes

• Comparing salary to invoice rate as if they were the same unit. They are not. Always compare loaded cost to loaded cost, with FTE benefits and contractor onboarding overhead both included.
• Skipping the ramp gap. First-year FTE productivity is typically 60 to 80% of steady-state. Pricing year 1 as if the FTE delivered 100% from week 1 understates true year-1 cost by $10,000 to $20,000.
• Ignoring continuity risk. A contractor who quits mid-project costs more in dropped work than the rate gap saves. Mission-critical work with single-source contractor exposure is a balance-sheet risk most founders do not price.
• Misclassifying to save FICA. The IRS audit rate on suspected misclassification is rising. The savings on a single FICA match are $5k to $10k/year. The downside in a contested case is 5 to 10x that.
• Not running the year-2 math. Year-1 cash comparison favors contractor in most scenarios. Year-2 effective-cost comparison usually favors FTE for core work. Decisions made on year-1 alone get re-litigated in year 2 at higher cost than running both columns upfront.
• Treating contractor as default for all hires. Solo founders who default to contracting often skip the engineering and ops work that compounds inside an FTE structure: documentation, system knowledge, customer relationships. The default-to-contractor pattern works for project-bounded work and burns equity in core-product work.

The right hire structure is a function of work pattern, time horizon, and budget tolerance for variance. The math is mechanical once the inputs are honest. The judgment is whether the work is core (FTE leans in) or peripheral (contractor leans in), and whether the founder can carry first-year FTE overhead without compromising runway. Run both columns in the calculator, run the year-2 column too, and the answer is rarely the one the headline rate suggested.

Related in this series

This is the cost-math deep-dive. The other two articles cover the parts a pure cost model leaves out:

• How to decide: hire or contract — the pillar decision frame: the three gates (classification, loaded cost, scope stability) and the order to run them in.
• Contractor vs employee, honestly (2026) — the classification-and-tradeoffs deep-dive: full IRS and DOL tests, the flexibility-versus-continuity calls, and when the honest answer is not the cheapest one.