Arborist Licensure + Insurance Calculator

How this calculator works

This calculator builds the fully-loaded arborist crew cost per hour from first principles. It takes the climber base wage, the helper base wage, the count of helpers on the crew, the NCCI class code 0106 workers-comp rate, the SUTA rate, the annual GL and commercial auto premium, the annual equipment depreciation allocation, the ISA cert maintenance cost, the ANSI Z133 PPE replacement cost, and the target billable utilization. From those it derives the crew base wage, the payroll load factor (FICA plus FUTA plus SUTA plus WC), the loaded payroll per hour, the per-hour amortization of GL plus commercial auto, equipment depreciation, and compliance costs, the fully-loaded crew cost per hour, and the breakeven billable rate at the target utilization.

The output is the operator-side cost basis — the figure the operator must understand before quoting a customer-facing billing rate. It feeds the loaded-crew-rate input on the tree-removal-job-pricing and recurring-contract-pricing calculators in this cluster, which apply target margin to compute recommended job and contract prices.

The framework — base wage, payroll load, fixed amortization

Most tree-service operators set a billing rate against the local market, discover at year-end that the operation did not clear a sustainable margin, and adjust upward the following year. The defensible approach starts from cost and reasons forward.

The cost stack has four layers. Crew base wage is the sum of climber wage and helper wages (climber wage plus helper count times helper wage). The payroll load factor multiplies the base wage by the employer-side payroll-tax stack. The fixed allocations cover GL plus commercial auto, equipment depreciation, and compliance costs amortized across 2,000 annual reference hours per crew. The breakeven billable rate divides the fully-loaded cost by the target billable utilization.

The payroll load factor

The payroll load factor is 1 plus FICA plus FUTA plus SUTA plus WC class code 0106 rate.

FICA at 7.65 percent is the employer-side share — 6.2 percent Social Security on the SS wage base (annually indexed, $168,600 for 2024) plus 1.45 percent Medicare on all wages. The employee pays an equivalent share via payroll deduction. Set by 26 U.S.C. § 3101 (employee) and 26 U.S.C. § 3111 (employer).

FUTA at 0.6 percent applies to the first $7,000 of wages per employee per year after the FUTA credit. The headline FUTA rate is 6.0 percent, but the FUTA credit (typically 5.4 percent for employers in states with their own SUTA program) reduces the effective rate to 0.6 percent. Set by 26 U.S.C. § 3301.

SUTA is state unemployment tax paid by the employer. The rate varies materially by state and by the employer's experience modification — new employers typically pay 3-4 percent on a state-specific wage base; established employers with no claims history may pay 0.5-2 percent; employers with significant unemployment claims history may pay 7-10 percent. Default 3.4 percent is a national-average new-employer figure; operators should enter their actual rate.

WC class code 0106 is the largest single payroll-tax component for tree-service operators. NCCI class code 0106 (Tree Pruning, Spraying, or Repairing — All Operations and Drivers) rates frequently land in the 15-25 percent of payroll range in monopolistic and high-loss-cost states (Ohio, North Dakota, Washington, Wyoming, parts of California) and 8-15 percent in lower-cost states. A $25 per hour climber wage carries $4-$6 per hour in WC load alone, before the rest of the payroll-tax stack. Enter the operator-specific rate from the most recent WC premium audit.

At a 15 percent WC rate and 3.4 percent SUTA rate, the total payroll load factor is 1.0 plus 0.0765 plus 0.006 plus 0.034 plus 0.15 = 1.27 — 27 percent above base wages.

NCCI class code 0106 — why tree work carries this WC rate

Tree work is genuinely high-hazard. Falls from height (climber and aerial-lift operator). Struck-by chainsaw and chipper feed-roll injuries. Struck-by falling limb. Contact with energized conductors. Crush injuries from rigged-piece swings. The OSHA fatality rate for tree-care work runs 5-10x the all-industry average and is among the highest of any occupational category tracked by BLS.

The class code 0106 rate funds the WC carrier's claim-payment obligation when an injury happens — and tree work generates claims that frequently include long-term disability, multi-year medical treatment, and in worst cases, death benefits. The high rate is the actuarial answer to the loss-history record of the industry.

Operators reduce the rate over time through experience modification — a multiplier applied to the manual rate based on the operator's actual claim history. A new operator pays the manual rate at experience-modification 1.0. An operator with 3-5 years of claim-free history may earn an experience-modification of 0.7-0.85 (a 15-30 percent reduction on the manual rate). An operator with significant claim history may pay an experience-modification of 1.3-1.5 (30-50 percent increase). The single largest lever the operator has on WC cost is a documented safety program that produces a low claim history.

The fixed allocations

Beyond the per-hour wage and payroll-tax stack, the operation carries fixed annual costs amortized across the 2,000-hour reference crew availability.

GL and commercial auto is the annual premium for general liability and commercial auto coverage. A typical 2-truck operator running GL at $1M / $2M and commercial auto on 2 bucket trucks plus a pickup pays $15,000-$25,000 annually. Larger operations with crane trucks, contract-specific additional-insured requirements, and umbrella coverage can run $35,000-$60,000 annually.

Equipment depreciation is the annual allocation per crew for bucket truck (typically $80,000-$150,000 amortized over 10 years), chipper ($25,000-$50,000 amortized over 8 years), climbing gear and chainsaws ($5,000-$10,000 amortized over 3-5 years), and miscellaneous tools. Default $25,000 per year is a typical figure for a single fully-equipped crew.

ISA cert maintenance covers the credentialed crew member's CEU course fees, recertification fee (every 3 years), and membership fee. Default $600 per year covers one credentialed climber.

ANSI Z133 PPE replacement covers the climbing line (typically replaced every 1-3 years depending on use, $300-$500 each), helmet with chinstrap, eye protection, hearing protection, chainsaw chaps ($150-$250), gloves, work boots, and work positioning lanyard. Default $1,200 per year is a typical figure for a single crew.

The allocations are amortized across 2,000 hours per year per crew (50 weeks at 40 hours, the maximum availability baseline). The target utilization input separately handles the productive-fraction calculation for the breakeven billable rate.

Target utilization and the breakeven rate

Target utilization is the share of the 2,000-hour annual crew availability that the operator actually bills to customers. Weather, drive time between jobs, equipment maintenance, and unbilled customer-facing time all reduce productive crew-hours.

At 65 percent utilization a crew that costs $200 per hour fully loaded must bill at $200 divided by 0.65 = $308 per hour breakeven — every billable hour subsidizes the unbilled hour the crew was paid for. Most tree-service operators run 60-75 percent utilization in good weather years; northern operators with significant dormant-season idle time may run 45-55 percent on a 12-month basis and need to charge correspondingly more during the production season. Below 60 percent the operation is fundamentally under-utilized; above 80 percent leaves no margin for absorption of weather days or equipment downtime.

The breakeven billable rate is the cost-recovery floor — it does NOT include target profit margin. Add a target gross margin on top to reach the recommended customer-facing billing rate. The customer-facing rate matches the loaded-crew-rate input on the tree-removal-job-pricing and recurring-contract-pricing calculators in this cluster.

ISA Certified Arborist and ANSI Z133 — the standards the rate funds

ISA Certified Arborist is the credentialed practitioner standard for tree assessment, pruning decisions, and structural integrity evaluation issued by the International Society of Arboriculture. The cert is the operational license most jurisdictions accept for protected-species and hazard-tree documentation. The annual maintenance cost in this calculator funds the credential.

ANSI Z133-2017 (Safety Requirements for Arboricultural Operations) is the consensus safety standard defining the operational baseline an arborist must hit on every job. The annual PPE allocation funds the climbing line, helmet, chaps, eye and hearing PPE that Z133 requires. A billing rate priced below the level that funds full Z133 compliance forces a corner-cutting decision on the route.

What this calculator does NOT model

Several real costs are out of scope. Office and yard overhead — the rent, utilities, admin staff, and accounting cost of running the operation as a business beyond the crew-direct cost. Add a separate overhead allocation on top of the breakeven billable rate (typically 15-25 percent of revenue). Owner compensation as a separate line (the calculator treats the climber wage as the climber-labor cost; owner draws are separate). Marketing and customer-acquisition cost. Bad debt and collection cost on commercial-customer slow-pay. Hurricane / catastrophic-loss reserves. Multi-state operations with multiple SUTA rates and WC classifications. CDL endorsements and DOT physical costs (bundle into the compliance allocation). Subcontractor crew economics (price as a separate line on the proposal).

True owner-operators (sole proprietor or single-member LLC working alone) do not pay FICA / FUTA on their own draws — they pay self-employment tax under 26 U.S.C. § 1401 instead, at 15.3 percent on net earnings up to the SS wage base. They are typically exempt from WC on themselves (most states allow sole proprietors and members of an LLC to exclude themselves from WC coverage). For owner-operators set climber wage to the owner's draw rate, set SUTA and WC rates to 0, run the calculator, then add a separate self-employment tax line at 15.3 percent on the climber wage. Work with a CPA to confirm the state-specific WC exclusion election rules.

Sources

• NCCI Scopes Manual class code 0106 — Tree Pruning, Spraying, or Repairing — All Operations and Drivers. The NCCI workers-compensation classification system. State-specific rates are filed by NCCI or by independent state rating bureaus and approved by the state insurance regulator. ncci.com
• ANSI Z133-2017 — Safety Requirements for Arboricultural Operations. The consensus safety standard for tree-care work. Climbing line, work positioning lanyard, helmet with chinstrap, eye and hearing PPE, leg protection for chainsaw operators, minimum approach distance to energized conductors. webstore.ansi.org
• ISA — International Society of Arboriculture, Certified Arborist credential. The credentialed practitioner standard for tree assessment, pruning decisions, and structural integrity evaluation. isa-arbor.com
• 26 U.S.C. § 3101 — Rate of Tax on Employees. FICA employee-side Social Security + Medicare tax rate. law.cornell.edu/uscode/text/26/3101
• 26 U.S.C. § 3111 — Rate of Tax on Employers. FICA employer-side Social Security + Medicare tax rate. law.cornell.edu/uscode/text/26/3111
• 26 U.S.C. § 3301 — Rate of Tax. FUTA tax on first $7,000 of wages per employee per year. law.cornell.edu/uscode/text/26/3301
• 26 U.S.C. § 1401 — Rate of Tax on Self-Employment Income. Self-employment tax for sole proprietors and single-member LLC owners. law.cornell.edu/uscode/text/26/1401
• State SUTA statutes. State-specific unemployment tax statutes. Rates vary materially by state and experience modification; the new-employer rate is the default starting point.

Last reviewed: 2026-05-17 against NCCI class code 0106 (tree pruning WC), ANSI Z133-2017 (PPE + safety baseline), ISA Certified Arborist credential structure, 26 U.S.C. §§ 3101 + 3111 (FICA), 26 U.S.C. § 3301 (FUTA), and state SUTA statutes.