Social Security is a major source of income for millions of older adults. For many, it's the sole income source in retirement. This means any changes to the program could have a significant impact on your financial situation.

Next year will be a big one for Social Security, with a historic cost-of-living adjustment (COLA) creating ripple effects across the program. But Social Security is also a hot topic in Washington, and some lawmakers have sweeping changes in mind. Here's what to expect.

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Source Fool.com