SC Workers' Comp & SSDI Offset Calculator Guide

SC Workers' Comp & SSDI Offset Calculator Guide

Receiving both workers' compensation and Social Security Disability Insurance (SSDI) benefits simultaneously is possible, but the federal government limits how much you can collect from both sources combined. For South Carolina residents navigating dual benefits, understanding the offset calculation is critical to avoiding overpayments and protecting your income.

How the Workers' Compensation Offset Works

The Social Security Administration imposes a rule known as the workers' compensation offset (also called the reverse offset in some states). Under federal law, your combined SSDI and workers' compensation benefits cannot exceed 80% of your average current earnings (ACE) before you became disabled.

South Carolina has elected what is known as a reverse offset arrangement. This means that instead of Social Security reducing your SSDI payment, South Carolina law allows the workers' compensation carrier to reduce its payments when combined benefits exceed the 80% cap. The practical effect on your total monthly income is the same — you cannot receive more than 80% of your pre-disability earnings — but which payer takes the reduction matters for administrative and legal purposes.

Calculating Your Average Current Earnings

The SSA calculates your Average Current Earnings (ACE) using the highest of three figures:

• Your average monthly earnings used to compute your SSDI benefit (your AIME)
• Your average monthly earnings from the five highest-earning consecutive years in your Social Security record
• Your average monthly earnings from the single highest-earning year in the five years immediately before you became disabled

The SSA then multiplies the ACE by 80% to establish your combined benefit cap. If your SSDI plus your gross workers' compensation weekly rate (converted to monthly) exceeds that cap, the offset kicks in and reduces one of the payments.

Example: If your ACE was $5,000/month, your combined cap is $4,000. If SSDI pays $1,800 and workers' comp pays $2,500 monthly, the combined total is $4,300 — $300 over the limit. Under South Carolina's reverse offset, the workers' comp carrier would reduce its payment by $300, bringing you to exactly $4,000/month.

What Counts as Workers' Compensation Income

Not every payment from a workers' compensation claim counts toward the offset calculation. The SSA includes the following in its offset math:

• Temporary total disability (TTD) payments
• Permanent total disability (PTD) payments
• Lump-sum settlements that are spread over time using the applicable weekly rate

Notably, lump-sum settlements present a planning opportunity. If your South Carolina workers' compensation case settles for a lump sum, the SSA will prorate that amount over time based on what the weekly benefit would have been. However, if the settlement agreement is carefully drafted to specify that it represents a payment for a defined period — or includes language about how it should be prorated — it may reduce or eliminate the offset period earlier than expected. This is one reason having an attorney review any settlement language before signing is essential.

Payments that generally do not count toward the offset include medical expense reimbursements, vocational rehabilitation payments, and certain other ancillary benefits.

South Carolina-Specific Considerations

South Carolina operates under the South Carolina Workers' Compensation Act, administered by the South Carolina Workers' Compensation Commission. The state's reverse offset election changes the administrative dynamic but not the ultimate income cap.

One important South Carolina nuance: the state's workers' compensation system pays TTD at 66⅔% of your average weekly wage, subject to a maximum set annually by the Commission. For injuries occurring in 2025, the maximum weekly TTD benefit is $1,035.78. When layered against SSDI, high-wage earners may hit the 80% combined cap quickly, while lower-wage workers may receive both benefits without any reduction at all.

Additionally, South Carolina's workers' compensation settlements often involve clincher agreements — comprehensive settlements that close out both medical and indemnity portions of the claim. How a clincher agreement is structured directly affects how long and how severely the SSA imposes the offset. An improperly worded clincher can cause the SSA to spread the settlement amount over your entire lifetime expectancy, reducing your SSDI for decades.

Reporting Requirements and Overpayment Risks

You are legally required to report any workers' compensation benefits to the SSA when you apply for SSDI and whenever your benefit amount changes. Failing to report can result in an SSDI overpayment notice — a demand from the SSA requiring you to repay benefits you were not entitled to receive.

Overpayment notices in workers' compensation offset cases are common and can reach tens of thousands of dollars. If you receive one, you have the right to:

• Request a reconsideration if you believe the calculation is wrong
• Request a waiver of overpayment if repayment would cause financial hardship and the overpayment was not your fault
• Appeal through the SSA's administrative process up to federal district court

Acting quickly is essential. SSA deadlines for requesting reconsideration or waiver are typically 60 days from the date of the overpayment notice, and missing that window can forfeit your appeal rights.

Maximizing Your Benefits With Proper Planning

Strategic planning around the offset can meaningfully increase your lifetime income from both systems. Key steps include:

• Obtain the SSA's offset calculation in writing before finalizing any workers' compensation settlement
• Work with your workers' comp attorney to include specific proration language in any lump-sum settlement agreement
• Track the offset end date — once workers' compensation payments end or the prorated lump-sum period expires, SSDI should return to its full amount
• Review your Social Security earnings record to verify the ACE calculation is accurate, as errors in the SSA's records can inflate the offset incorrectly
• Consider Medicare coordination — SSDI entitlement triggers Medicare eligibility after 24 months, and workers' compensation Medicare Set-Asides (WCMSAs) add another layer of planning

South Carolina claimants who handle workers' compensation settlements without accounting for the SSDI offset frequently leave significant money on the table or create long-term SSDI reductions that were entirely avoidable with proper drafting.

Need Help? If you have questions about your case, call or text 833-657-4812 for a free consultation with an experienced attorney.

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