IRS Common-Law and Historical 20-Factor Checklist
Primary IRS source: IRS Independent Contractor Defined. The IRS now emphasizes behavioral control, financial control, and the relationship of the parties. The historical 20-factor checklist is still useful as a diagnostic framework, but no single factor is decisive.
| # | Factor | Payroll classification question |
|---|---|---|
| 1 | Instructions | Does the business control when, where, and how the work is performed? |
| 2 | Training | Does the business train the worker in company procedures? |
| 3 | Integration | Is the work integrated into core business operations? |
| 4 | Services rendered personally | Must the named worker do the work personally? |
| 5 | Hiring assistants | Can the worker hire and pay assistants independently? |
| 6 | Continuing relationship | Is the relationship ongoing rather than project-based? |
| 7 | Set hours | Does the business set hours or schedule? |
| 8 | Full-time required | Must the worker substantially devote full time to the business? |
| 9 | Work on premises | Is work required on the employer site? |
| 10 | Order or sequence | Does the business set the order of tasks? |
| 11 | Reports | Must the worker submit regular reports? |
| 12 | Payment method | Is the worker paid by hour, week, or month rather than by project? |
| 13 | Expenses | Does the business reimburse routine expenses? |
| 14 | Tools and materials | Does the business provide significant tools or equipment? |
| 15 | Investment | Does the worker lack a meaningful business investment? |
| 16 | Profit or loss | Can the worker realize entrepreneurial profit or loss? |
| 17 | Multiple clients | Does the worker work only for one business? |
| 18 | Services available to market | Does the worker advertise services to the public? |
| 19 | Right to discharge | Can the business terminate the worker like an employee? |
| 20 | Right to quit | Can the worker quit without contractual liability? |
Department of Labor Economic Reality Factors
Primary DOL source: Department of Labor worker misclassification guidance and DOL independent contractor rule resources.
| DOL factor | Payroll question |
|---|---|
| Opportunity for profit or loss | Managerial skill and business risk |
| Investments by worker and employer | Whether the worker is operating independently |
| Permanence | Duration and exclusivity of the relationship |
| Nature and degree of control | Scheduling, supervision, price setting, and restrictions |
| Integral work | Whether the work is critical, necessary, or central to the business |
| Skill and initiative | Business-like independent initiative, not merely technical skill |
ABC Test Overview
The ABC test is a stricter state-law framework used in some jurisdictions and programs. A typical ABC test asks whether the worker is free from control, performs work outside the usual course of the hiring entity's business, and is customarily engaged in an independently established trade or business. Failing one part can create employee status for that law even if another federal test points the other way.
ABC tests vary by state and by legal context. Some apply to unemployment insurance, some to wage-and-hour law, some to workers compensation, and some to specific industries. This is why payroll teams should not classify a worker using a single national checklist. They should identify the work state, governing statute, agency guidance, contract terms, and actual working practice.
Consequences of Misclassification
If a worker is treated as an independent contractor but should be an employee, the business may owe back payroll taxes, employer FICA, federal and state unemployment tax, withholding tax, overtime, minimum wage, benefits, workers compensation premiums, paid leave contributions, penalties, interest, and corrected information returns. The worker may also need corrected Form W-2 treatment instead of Form 1099 reporting.
Classification should be decided before payment begins. Once a worker has been paid as a contractor for months or years, cleanup becomes harder because Forms 1099, expense deductions, benefit eligibility, overtime records, and state reports may all need review. When the classification is uncertain, employers should document the facts, get legal or tax advice, and avoid using contractor status merely to reduce payroll tax cost.
Implementation Notes
Payroll estimates should separate employee taxes from employer taxes. Employees see federal income tax, Social Security, Medicare, and state or local withholding on the pay statement. Employers separately owe matching FICA, FUTA, and state unemployment or payroll program contributions. Mixing those categories can make take-home pay look too low or employer cost look too high.
A useful audit trail records the wage period, pay date, gross wages, taxable wage adjustments, pre-tax benefit deductions, taxable fringe benefits, withholding certificate assumptions, and deposit date. When a payroll number has to be explained later, the calculation path is usually more important than the final rounded dollar amount.
Federal payroll rules and state payroll rules do not update on the same calendar. Some state changes become effective on January 1, some on July 1, and some are retroactive after legislation. This is why each page links to the official agency source and carries a dateModified value of 2026-04-30.
For multi-state workers, the physical work location, the residence state, reciprocity agreements, employer nexus, and local tax rules can all affect withholding. A single annual salary can produce different net pay results when the employee works remotely, travels between offices, or moves during the year.
Payroll software should be treated as a compliance system, not just a calculator. Configure it with the correct legal employer, state account numbers, SUI rate notices, filing frequencies, authorized payment accounts, and year-end wage statement settings before processing live payroll.
The safest estimates show their assumptions. Good pages tell the user whether numbers are annual, per-pay-period, employee-only, employer-only, before credits, after credits, or before local taxes. That transparency reduces support questions and prevents estimates from being mistaken for tax advice.
Employers should reconcile payroll totals before every quarterly return. Compare wages, taxable Social Security wages, taxable Medicare wages, federal income tax withheld, state withholding, and deposits. Differences caught before filing are easier to correct than differences found after IRS or state notices arrive.
When the calculation involves a bonus, commission, severance payment, back pay, moving expense, or taxable fringe benefit, check the supplemental wage rules. The right method can differ from regular payroll withholding even though the payment still appears on Form W-2.
For employees, the most practical use of a payroll calculator is planning. It helps compare job offers, evaluate 401(k) contributions, estimate the value of pre-tax health deductions, and understand why gross salary and net pay can be far apart.
For employers, the most practical use is cash planning. A business must have funds ready not only for net pay but also for payroll deposits, employer FICA, unemployment tax, benefit invoices, workers compensation, and year-end reporting costs.
A paycheck is only one point in a tax year. Refunds and balances due are determined on the personal or business return after all income, deductions, credits, and withholding are combined. Payroll withholding is designed to approximate liability, not to settle every tax issue immediately.
This resource is intentionally conservative about credentials: PayrollCalculator.us is an informational calculator site operated by Mustafa Bilgic, not a CPA firm, enrolled-agent practice, payroll bureau, or tax preparation company. Users should confirm material decisions with a qualified professional.