Economic Damages Calculation for Commercial Litigation in South Carolina

When businesses suffer financial harm from breach of contract, unfair competition, or intellectual property theft, quantifying those damages with reasonable certainty is essential to recovery. This guide explains how forensic accountants calculate economic damages in South Carolina courts, the methodologies we employ, and the legal standards we must meet.

By Zachary Mueller, CPA, CFE, CFF, ABV Published: October 2, 2025 25 min read

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Understanding Economic Damages in Commercial Litigation

Economic damages, also called compensatory damages, are designed to make the injured party whole by compensating them for actual financial losses suffered due to another party's breach or wrongful conduct. Unlike punitive damages (which punish the wrongdoer) or nominal damages (which recognize a legal wrong without substantial harm), economic damages represent measurable financial harm.

The Purpose of Economic Damages

South Carolina follows the fundamental principle that damages should place the plaintiff in the position they would have occupied "but for" the defendant's wrongful conduct. This compensatory principle drives every aspect of damages calculation—we're not trying to punish the defendant or provide a windfall to the plaintiff, but rather to measure and restore what was lost.

For Greenville businesses engaged in commercial litigation, this means demonstrating not just that harm occurred, but quantifying that harm with sufficient specificity that a judge or jury can make a reasoned award.

Economic vs. Non-Economic Damages

Economic Damages (Measurable):

  • Lost profits from business operations
  • Lost revenue from interrupted contracts
  • Diminished business value
  • Increased operating costs
  • Lost business opportunities
  • Cost to repair or replace damaged property
  • Out-of-pocket expenses incurred

The Role of the Forensic Accountant

Calculating economic damages requires specialized expertise that combines accounting knowledge, industry expertise, financial modeling, economic analysis, and understanding of the legal framework. This is where forensic accountants become invaluable. We don't just calculate numbers—we build defensible, well-documented analyses that withstand cross-examination and meet South Carolina's legal standards for damages proof.

Types of Economic Damages in Commercial Cases

Commercial litigation in South Carolina encompasses numerous damage theories. Understanding which type of damages applies to your case is the first step in proper quantification.

1. Lost Profits

Lost profits represent the net income a business would have earned "but for" the defendant's wrongful conduct. This is the most common form of economic damages in commercial litigation.

Lost Profits = (Lost Revenue) - (Variable Costs Avoided) - (Mitigation Benefits)

Key Distinction: Lost profits are NET income (revenue minus variable costs), not gross revenue. A common error is claiming all lost revenue as damages without accounting for costs that wouldn't have been incurred.

2. Business Interruption Damages

Business interruption damages compensate for lost income when operations are disrupted due to property damage, supplier failure, or other interrupting events. Components include:

  • Lost net profits during interruption period
  • Continuing fixed expenses (rent, salaries, insurance)
  • Extra expenses incurred to minimize interruption
  • Time required to restore business to pre-interruption level

3. Diminished Business Value

When wrongful conduct permanently reduces the value of a business, the diminished value represents recoverable damages.

Diminished Value = (Business Value "But For" Breach) - (Business Value After Breach)

4. Intellectual Property Damages

IP infringement damages take several forms under South Carolina and federal law:

  • Patent Infringement: Lost profits or reasonable royalty
  • Trade Secret Misappropriation: Lost profits, unjust enrichment, or reasonable royalty
  • Trademark Infringement: Lost profits, corrective advertising costs

The "But For" Analysis Framework

The cornerstone of economic damages analysis is the "but for" scenario—what would have happened if the wrongful conduct had not occurred? Every damages calculation compares actual performance against this hypothetical but-for scenario.

Components of But-For Analysis

1. Historical Performance Baseline

Analyze the business's historical financial performance to establish normal operating patterns including revenue trends, profit margins, seasonal patterns, and growth trajectories.

2. Industry and Market Conditions

The but-for scenario must account for market realities including industry growth rates, competitive dynamics, economic conditions, and market size analysis.

3. Business-Specific Factors

Consider management capabilities, capacity constraints, capital availability, key customer relationships, and competitive advantages or disadvantages.

4. Damage Period Definition

Clearly define when damages begin and end—the start date when wrongful conduct first caused harm and the end date when damages are complete.

Methodologies for But-For Analysis

Before-and-After Method

Compare performance before the wrongful event with performance after. Most appropriate when the business was stable before the event and the event caused a clear disruption.

Yardstick Method

Use a comparable business or market segment as a benchmark for what plaintiff's performance should have been. Useful when plaintiff's actual performance is completely disrupted or when comparable data exists.

Sales Projection Method

Use the plaintiff's pre-event business projections, validated and adjusted as necessary. Requires that projections were created before the dispute arose and are realistic and supportable.

Market Share Method

Project plaintiff's market share and apply to total market size to determine but-for performance. Particularly useful in IP infringement and unfair competition cases.

Lost Profits Calculation Methodologies

Lost profits represent the most common economic damages in South Carolina commercial litigation. Calculating lost profits requires sophisticated analysis that courts will scrutinize carefully.

Step-by-Step Lost Profits Calculation

Step 1: Calculate Lost Revenue

Use one of the but-for methodologies to project what revenues would have been absent the wrongful conduct. Consider growth trajectory, capacity constraints, customer commitments, market conditions, and competitive factors.

Step 2: Deduct Variable Costs

Only NET profits are recoverable. You must deduct all costs that would have been incurred to generate the lost revenue:

  • Cost of goods sold (COGS)
  • Direct labor tied to production/sales
  • Sales commissions
  • Shipping and freight costs
  • Raw materials and supplies
  • Variable utilities

Critical Concept:

Fixed costs that continue regardless (rent, administrative salaries, insurance, depreciation) are generally NOT deducted from lost revenue when calculating lost profits.

Step 3: Account for Mitigation

South Carolina law requires plaintiffs to mitigate damages. The calculation must reflect revenue earned from alternative sources, costs saved through mitigation, and any benefits realized from mitigation activities.

Step 4: Define Damage Period

Lost profits continue until the contract term would have ended, the business returns to but-for performance level, the business permanently stabilizes at a lower level, or the harm is otherwise remedied.

Present Value Considerations

When lost profits extend into future periods, they must be reduced to present value. This accounts for the time value of money, investment opportunity cost, inflation, and risk.

Present Value = Future Lost Profits / (1 + Discount Rate)^Number of Years

Business Interruption Claims

Business interruption damages compensate for lost income when operations are disrupted. While similar to lost profits, business interruption has unique characteristics requiring specialized analysis.

Components of Business Interruption Damages

1. Lost Net Income

The profits the business would have earned during the interruption period, calculated similar to lost profits analysis.

2. Continuing Fixed Expenses

Fixed costs that continue despite interruption: rent, insurance, salaried employees, loan payments, property taxes, equipment leases.

3. Extra Expenses

Costs incurred to minimize interruption: expedited repairs, temporary facilities, premium shipping, overtime pay, additional advertising.

4. Extended Business Interruption

Time required to rebuild customer base and return to pre-interruption performance levels after physical reopening.

Defining the Interruption Period

Accurately defining the interruption period is critical. Consider:

  • Start Date: When operations first became impaired
  • End Date: Physical restoration, operational restoration, or revenue restoration
  • Extended Period: Time to rebuild customer relationships and market position

Intellectual Property Damages

Intellectual property infringement creates unique damages issues. South Carolina courts handle both state law trade secret cases and federal patent and trademark cases, each with distinct damage frameworks.

Patent Infringement Damages

Patent cases in federal court follow 35 U.S.C. § 284, providing for "damages adequate to compensate for the infringement, but in no event less than a reasonable royalty."

Lost Profits from Patent Infringement

Patent owner must prove:

  1. Demand for patented product existed
  2. Absence of acceptable non-infringing substitutes
  3. Manufacturing and marketing capability
  4. Amount of profit patent owner would have made

Reasonable Royalty

When lost profits can't be proven, patent owner is entitled to at least a reasonable royalty—the amount a willing licensee would pay for the right to use the patent. Courts consider the Georgia-Pacific factors to determine appropriate royalty rates.

Trade Secret Misappropriation (SC Uniform Trade Secrets Act)

South Carolina Code § 39-8-30 governs trade secret damages. Plaintiff can recover:

  • Actual loss caused by misappropriation
  • Unjust enrichment not captured by actual loss
  • Reasonable royalty for unauthorized use

Diminished Business Value Analysis

When wrongful conduct permanently reduces a business's value, the diminution in value represents recoverable economic damages. This requires business valuation expertise.

When Diminished Value Claims Apply

  • Loss of key customer relationships that won't be regained
  • Destruction of competitive advantage
  • Permanent market share loss
  • Damage to business reputation affecting future earnings
  • Loss of intellectual property providing lasting competitive edge

Business Valuation Approaches

Income Approach

Values business based on present value of future economic benefits. Most common for diminished value claims using discounted cash flow or capitalization methods.

Market Approach

Compares business to similar businesses that have sold. Uses market multiples applied to financial metrics.

Asset Approach

Values business based on underlying assets minus liabilities. Less common for damages as commercial businesses derive value from earnings, not assets.

Avoiding Double Recovery

Plaintiff cannot recover BOTH lost profits AND diminished value for the same harm. Choose either lost profits for specific period until harm ends, OR diminished value if harm is permanent.

The Expert Witness Process

When economic damages are disputed in South Carolina commercial litigation, forensic accountants typically serve as expert witnesses. Understanding this process helps attorneys and businesses work effectively with their experts.

Initial Engagement and Case Assessment

  1. Conflict Check: Ensure no conflicts of interest
  2. Initial Consultation: Discuss case facts and damages issues
  3. Engagement Letter: Define scope, fees, and timeline
  4. Early Assessment: Determine if damages can be calculated with reasonable certainty

Expert Report Requirements

For testifying experts in federal court and many state court cases, a comprehensive written report is required including:

  • Complete statement of all opinions to be expressed
  • Basis and reasons for each opinion
  • Facts and data considered
  • Exhibits to support opinions
  • Expert qualifications and prior testimony
  • Compensation for the case

Deposition and Trial Testimony

After reports are exchanged, experts typically face deposition by opposing counsel. During trial, experts present findings through direct examination, withstand cross-examination, and may be rehabilitated on re-direct.

Expert Witness Standards

South Carolina State Courts: Jones-Council standard under SC Rule of Evidence 702

Federal District Court: Daubert standard under Federal Rule of Evidence 702

Both require qualified expert, reliable methodology, and testimony that assists factfinder.

Case Study: Manufacturing Supply Agreement Breach

Background

Specialty metal fabrication company in Greenville County with $8 million annual revenue had five-year exclusive supply agreement with major equipment manufacturer guaranteeing $2.5 million minimum annual purchases. Customer terminated after 18 months without cause.

Analysis Approach

But-For Revenue Projection:

Year 1 (10 months): $2.1M Year 2: $2.5M Year 3: $2.5M Year 4: $2.6M Total: $9.7M

Lost Profits Calculation:

  • Historical gross margin: 34%
  • Variable operating expenses: 8%
  • Total lost profits: $2,522,000

Mitigation Analysis:

  • New revenue obtained: $5,500,000
  • Net mitigation benefit: $1,725,000
  • Mitigation costs: $145,000

Final Damages:

Total Lost Profits: $2,522,000 Less: Net Mitigation: ($1,725,000) Net Lost Profits: $797,000 Plus: Consequential Damages: $420,000 Present Value Total: $2,492,916

Outcome

Settlement: $2,100,000 (84% of base case expert opinion)

Key Success Factors: Conservative assumptions, strong documentation, credible mitigation analysis, clear causation, effective expert presentation

Working with Your Forensic Accounting Expert

Effective collaboration between attorneys, business clients, and forensic accounting experts maximizes the value of damages analysis and strengthens litigation outcomes.

For Attorneys: Getting the Most from Your Expert

Best Practices:

  • Early Engagement: Bring in forensic accountant before filing or shortly after
  • Clear Communication: Explain legal theories and what must be proven
  • Document Organization: Provide well-organized, indexed documents
  • Discovery Strategy: Work with expert to identify critical documents
  • Realistic Expectations: Understand limitations of damages proof
  • Budget Planning: Discuss fee structure upfront

For Business Clients: Preparing Your Case

  • Maintain complete accounting records and contracts
  • Document all mitigation efforts and costs
  • Preserve evidence once litigation is likely
  • Be transparent about case weaknesses
  • Have realistic damage expectations

Questions to Ask Your Expert

  1. What methodology will you use and why?
  2. What are the strengths and limitations of your analysis?
  3. How long will the analysis take?
  4. What is your fee structure and total cost estimate?
  5. How many times have you testified in South Carolina courts?
  6. How do you explain complex matters to juries?

Red Flags to Watch For:

  • Expert guarantees specific damage amount
  • Won't acknowledge limitations or weaknesses
  • Uses aggressive assumptions without support
  • Can't explain methodology clearly
  • Misses deadlines or communication lapses

Frequently Asked Questions

Q: How are economic damages different from punitive damages?

Economic damages compensate for actual financial losses suffered—they're designed to make the plaintiff whole. Punitive damages are intended to punish the defendant for particularly egregious conduct. South Carolina allows punitive damages only in specific circumstances and caps them at three times compensatory damages or $500,000, whichever is greater.

Q: Can I recover lost profits if my business is new?

It's more challenging but not impossible. South Carolina courts require proving lost profits with reasonable certainty, which is harder for new businesses lacking historical performance. You'll need strong evidence including detailed business plans, industry analysis, market data, specific customer commitments, and management with relevant track record.

Q: What's the statute of limitations for commercial lawsuits in SC?

For breach of written contracts: 3 years. For breach of oral contracts: 3 years. For fraud: 3 years from discovery. For unfair trade practices: 3 years. Time begins running from when the breach occurred or was discovered. Consult an attorney promptly as these deadlines are strictly enforced.

Q: Do I need to hire a forensic accountant for damages?

For significant damages claims in commercial litigation, expert testimony is typically necessary. While parties can testify about their own losses, complex damages calculations require expert analysis to meet the "reasonable certainty" standard. Courts find expert testimony more credible than self-interested party testimony.

Q: How much does a forensic accountant cost?

Hourly rates in Greenville typically range $200-$450. Total costs might range from $15,000 for straightforward calculations to $50,000-$100,000+ for complex cases with business valuation. Early consultation can help estimate costs for your specific case.

Q: How does the duty to mitigate damages work?

South Carolina law requires plaintiffs to take reasonable steps to minimize damages after a breach. You can't allow damages to accumulate if reasonable alternatives exist. However, you're not required to take extraordinary measures. The defendant bears the burden of proving failure to mitigate. Document all mitigation attempts to show you acted reasonably.

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