How Cities and Local Governments Can Be Exempt From Paying Into SSDI

Most American workers pay into Social Security — and through that payroll contribution, they earn the work credits that make SSDI (Social Security Disability Insurance) possible. But not every employer is required to participate. Some cities and local government employers operate outside the Social Security system entirely, which creates a situation that surprises many public employees: they may have spent decades working for a city and still be ineligible for SSDI based on that work.

Here's how that exemption works, why it exists, and what it means for workers caught in the middle.

The Short Answer: Some Public Employers Opted Out Before 1984

Social Security coverage for government employees wasn't always mandatory. For decades, state and local governments — including cities, counties, and special districts — were allowed to choose whether to participate in Social Security. Many opted out, offering their own public pension systems instead.

In 1983, Congress passed legislation requiring that federal civilian employees hired after January 1, 1984 be covered under Social Security. But state and local governments were handled differently. Those that were already out of the system before 1984 were generally allowed to stay out — and many did.

That's the origin of the exemption. It isn't something cities actively apply for today. It's a grandfathered status rooted in historical decisions made before Social Security participation became the norm.

What "Opting Out" Actually Means for Workers

When a city doesn't participate in Social Security, it means:

• Neither the employer nor the employee pays FICA payroll taxes for Social Security or Medicare (the 6.2% and 1.45% withheld from most paychecks)
• The employee does not earn Social Security work credits for that employment
• Without enough work credits, an employee cannot qualify for SSDI based on that job history

SSDI eligibility depends on having paid into the Social Security system long enough and recently enough. The SSA measures this through work credits — you earn up to four per year, and SSDI generally requires between 20 and 40 credits depending on your age when you become disabled. If your only significant employment was with a non-covered city employer, you may not have those credits.

The Section 218 Agreement: The Mechanism Behind Coverage

The formal mechanism that governs which state and local government employees are covered is called a Section 218 Agreement — named after Section 218 of the Social Security Act.

States enter into these agreements with the Social Security Administration on behalf of their political subdivisions, which include cities, counties, school districts, and other local entities. Coverage is negotiated group by group.

Some city employees are covered under a Section 218 Agreement. Others are explicitly excluded. And in some jurisdictions, no agreement exists at all.

What Replaces Social Security for These Workers?

Cities that opt out of Social Security typically offer alternative retirement and disability benefits through public pension systems. Examples include state teacher retirement systems, municipal employee pension funds, and other defined-benefit plans.

These pensions may include disability provisions — but they operate under entirely different rules than SSDI. They're not administered by the SSA, don't follow SSA medical standards, and aren't connected to Medicare eligibility the way SSDI is.

This distinction matters because SSDI comes with Medicare coverage after a 24-month waiting period — a significant benefit that standalone pension disability plans don't automatically provide.

The Windfall Elimination Provision and Government Pension Offset 🏛️

Even workers who do eventually qualify for Social Security — perhaps through a second job or prior private-sector work — may see their SSDI benefit reduced if they also receive a pension from non-covered government employment.

Two rules govern this:

• Windfall Elimination Provision (WEP): Reduces the Social Security benefit formula for workers who receive a pension from non-covered work. This can meaningfully lower an SSDI payment.
• Government Pension Offset (GPO): Affects spousal and survivor benefits. If a spouse receives a government pension from non-covered employment, their Social Security spousal benefit is reduced by two-thirds of the pension amount.

Both rules exist because Social Security's benefit formula is designed to replace a higher percentage of income for lower earners — and a government pension from non-covered work can make a worker appear to be a low earner when they aren't.

How Mixed Work Histories Change the Picture ⚖️

Many people have worked both in covered and non-covered employment at different points in their careers. A worker might spend 15 years in private-sector jobs paying into Social Security, then move to city employment under a non-covered pension.

In that case:

• Work credits from the private-sector years still count
• SSDI eligibility depends on whether those credits are sufficient and recent enough at the time of disability
• The government pension from city work may trigger WEP, reducing the SSDI benefit

The SSA uses a concept called the recent work test alongside the total credits test. Even if a worker accumulated enough credits overall, they generally need to have earned a portion of those credits within the 10 years immediately before becoming disabled. A long gap in covered employment — like a 20-year career with a non-covered city — can break that recency requirement.

The Piece That Only Your Own Record Can Answer

The rules around city exemptions, Section 218 Agreements, WEP, and mixed work histories are complex but consistent — they apply the same way to everyone. What varies is how those rules interact with your specific earnings record, the timing of your work history, the disability onset date, and whether your city employer has a Section 218 Agreement or not.

Those details don't appear in general articles. They live in your Social Security earnings record and your employer's coverage status — and they're what ultimately determine whether a career with a non-covered city leaves you with a path to SSDI, or requires you to look elsewhere.