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Calculation Methodology & Legal Sources

A transparent breakdown of the mathematical models, federal employment regulations, and state statutory frameworks utilized across SeveranceCalc.us.

Summary of Calculation Pillars

The SeveranceCalc engine synthesizes four distinct financial and statutory components: (1) Base Compensation Normalization, (2) Service-Based Severance Formulae, (3) Accrued Vacation/PTO Statutory Classification, and (4) COBRA Healthcare Subsidy Benchmarks. All calculations are executed on the client device without transmission of user salary data.

1. Base Compensation & Rate Normalization

To establish an equitable baseline across both salaried and hourly workers, the calculator standardizes input earnings into equivalent weekly and hourly rates using federal Fair Labor Standards Act (FLSA) standard conventions (29 CFR § 778.113):

Annual Salaried Employees:
- Weekly Rate = Annual Base Salary / 52 weeks
- Effective Hourly Rate = Weekly Rate / 40 hours
Hourly Employees:
- Weekly Rate = Hourly Base Wage × 40 standard weekly hours
- Annualized Equivalent = Weekly Rate × 52 weeks

Note: In accordance with standard corporate severance policies, base compensation calculations exclude unvested stock options (RSUs/equity), discretionary performance bonuses, and travel expense reimbursements unless expressly guaranteed in a formal separation agreement.

2. Severance Pay Formula Models

Because the federal government does not mandate severance pay under the Fair Labor Standards Act (FLSA), our calculator models the three primary standard benchmarks recognized by the Society for Human Resource Management (SHRM) and US corporate practice:

Policy Tier	Formula Applied	Typical Eligibility & Industry Practice
Standard (1 Week / Year)	`Weekly Rate × Years of Service`	Standard baseline for non-exempt and hourly workforce.
Professional (2 Weeks / Year)	`Weekly Rate × 2 × Years of Service`	Most common standard for exempt salaried, technology, finance, and engineering professionals.
Enhanced (3 Weeks / Year)	`Weekly Rate × 3 × Years of Service`	Senior managers, directors, long-tenured employees (10+ years), or competitive tech sector RIFs.
Executive Tier (1 Month / Year)	`Weekly Rate × 4.333 × Years of Service`	VP and C-suite leadership packages; typically includes accelerated equity and extended health coverage.

3. State-by-State PTO / Accrued Vacation Payout Mechanics

Unlike voluntary severance pay, the payout of accrued, unused Paid Time Off (PTO) or vacation days is governed by state statutory wage payment acts. SeveranceCalc classifies states into three distinct legal categories:

Category A: Mandatory Payout by Statutory Law

In states such as California, Colorado, Illinois, Massachusetts, Montana, and Nebraska, earned vacation time is defined as "vested wages." The employer cannot enforce "use-it-or-lose-it" forfeiture clauses. 100% of accrued unused vacation hours must be converted to cash at the final rate of pay upon separation.
Formula: PTO Payout = Unused PTO Hours × Effective Hourly Rate

Category B: Payout Required Unless Explicit Written Policy Forfeits

In states like New York, North Carolina, and Ohio, employers are required by default to pay accrued vacation upon separation unless the employer maintains an explicit, written employee policy or signed agreement clearly stating that unused vacation is forfeited upon termination (e.g. NY Labor Law § 195).

Category C: Governed by Written Employer Policy / Contract

In states such as Texas, Florida, Georgia, and Washington, state statutes do not affirmatively mandate vacation pay unless the employer has contractually promised payment in an employee handbook, policy memo, or employment agreement.

4. COBRA Healthcare Insurance Subsidy Benchmarks

Under Title X of the Consolidated Omnibus Budget Reconciliation Act of 1985 (COBRA, 29 U.S.C. § 1161 et seq.), terminated workers have the statutory right to continue their employer-sponsored group health coverage for up to 18 months (or 36 months under certain qualifying events).

However, the employee must pay up to 102% of the full premium cost (the 100% total premium plus a 2% administrative fee). According to the Kaiser Family Foundation (KFF) Employer Health Benefits Benchmark Survey:

Individual Coverage: Average total monthly group health premium is approximately $650 to $800/month ($700/mo benchmark).
Family Coverage: Average total monthly group health premium is approximately $1,800 to $2,300/month ($2,000/mo benchmark).

Our calculator applies a standard average benchmark of $700/month for single coverage subsidies negotiated as part of the severance package.

5. Tax Withholding Framework (IRS Publication 15-T)

Severance pay and PTO payouts are treated by the Internal Revenue Service as supplemental wages under Treasury Regulation § 31.3402(g)-1. Key statutory withholding rules:

Federal Supplemental Income Tax: A flat withholding rate of 22% applies to supplemental wage payments up to $1 million within a calendar year (IRS Pub. 15-T, Section 7). Payments exceeding $1 million are subject to withholding at 37%.
FICA Taxes: Mandatory 6.2% Social Security (up to the annual statutory wage base cap) and 1.45% Medicare tax (with an additional 0.9% for high-income earners above statutory thresholds under 26 U.S.C. § 3101).
State Supplemental Withholding: Applicable state supplemental income tax rates vary by jurisdiction (e.g. California applies a 10.23% supplemental wage withholding rate; New York applies a supplemental rate up to 11.70%).

Primary Statutory Citations & Government Authorities

U.S. Department of Labor (DOL) - FLSA: 29 U.S.C. § 201 et seq.; 29 CFR Part 778. www.dol.gov/agencies/whd/flsa
U.S. Department of Labor (DOL) - WARN Act: 29 U.S.C. § 2101 et seq.; 20 CFR Part 639. www.dol.gov/agencies/eta/layoffs/warn
Internal Revenue Service (IRS): Publication 15-T (Federal Income Tax Withholding Methods). www.irs.gov/publications/p15t
California Department of Industrial Relations: California Labor Code § 227.3; Suastez v. Plastic Dress-Up Co., 31 Cal.3d 774 (1982). www.dir.ca.gov/dlse
New York State Department of Labor: NY Labor Law § 195; Wage Payment Guidelines. dol.ny.gov
Texas Workforce Commission (TWC): Texas Labor Code Chapter 61 (Texas Payday Law). www.twc.texas.gov
Illinois Department of Labor: Illinois Wage Payment and Collection Act (820 ILCS 115/). labor.illinois.gov
Equal Employment Opportunity Commission (EEOC): Older Workers Benefit Protection Act (OWBPA), 29 U.S.C. § 626(f). www.eeoc.gov