Could the Flat-Rate Social Security COLA Actually Save Some Retirees Money on Taxes?

A smaller Social Security raise probably doesn't sound like good news, but it could come with one small tax wrinkle. If your COLA is lower, less income may end up being taxable, which could shave a little off your federal tax bill.

That possibility is part of the debate over a flat-dollar COLA, which would give retirees the same dollar increase instead of the same percentage raise.

Any tax savings could be welcome, especially if you're trying to save money in retirement, but they may be much smaller than the benefit income you give up. Here's how the trade-off could work.

How the flat-dollar COLA would change your check

Under the current system, a 2.8% COLA on the average retired-worker benefit produces roughly $58 more per month. Your increase is based on the size of your own check, so a larger benefit gets a larger dollar raise.

The flat-dollar proposal would calculate the raise based on a lower benefit level, roughly the 20th percentile, and give everyone that same dollar amount. At 2.8% inflation, that works out to about $34 a month.

If your benefit is near the average, you'd receive $34 instead of $58, about $24 less per month or roughly $288 less over a year.

Why a smaller raise means slightly less tax

The IRS determines how much of your Social Security is taxable by adding up your other income and half of your annual Social Security benefit.

For single filers, taxes can begin once combined income reaches $25,000, and for married couples filing jointly, the starting point is $32,000. Depending on your income, up to 50% or 85% of your benefits can be included in taxable income.

A smaller COLA would raise your Social Security income by less, which could also leave your combined income a little lower. Using the earlier example, receiving about $288 less in Social Security over the year would reduce the Social Security portion of that combined-income calculation by about $144.

That could reduce your tax bill in some cases, especially if you're close to one of the income thresholds. The savings would usually be much smaller than the Social Security income you gave up, though, so a lower COLA wouldn't automatically leave you better off overall.

When a smaller COLA could make a difference at tax time

If your combined income is well below the Social Security tax thresholds, a smaller COLA may not change your tax bill at all because your benefits may already be tax-free.

Retirees closer to those thresholds could notice a little more of a difference. A smaller increase may keep more of their Social Security from becoming taxable, while higher-income retirees could also owe slightly less if less of their benefit is included in taxable income.

How much you save will depend on your other income and tax situation, but the tax break would usually make up only a small part of the Social Security income you gave up.

How the senior deduction compares with the COLA tax effect

If you're 65 or older, you may qualify for an additional federal tax deduction of up to $6,000 through 2028. Married couples can receive up to $12,000 if both spouses qualify, although the deduction phases out at higher incomes.

The deduction can lower your taxable income after the IRS determines how much of your Social Security is taxable, so it may reduce the tax you owe without cutting your monthly benefit.

A flat-dollar COLA works the other way around. You'd receive a smaller Social Security increase first, and any tax savings would come only because less benefit income was added. For many retirees, the senior deduction is likely to have a much bigger effect on taxes than the smaller COLA.

Why a lower tax bill may still leave you with less

Using the earlier example, a flat-dollar COLA would leave you with about $288 less in Social Security over the year. You might owe a little less in federal taxes because your benefit is smaller, but those savings would usually cover only part of what you gave up.

AARP modeled someone who retired at 65 in 1998 with the average benefit for a new retiree. By age 93 in 2026, that person would have received about $77,900 less under a flat-dollar COLA, after adjusting for inflation.

A slightly lower tax bill can help at the margins, but smaller Social Security increases year after year could have a much bigger effect on the income you have available throughout retirement.

Why frozen tax thresholds are part of the bigger problem

Social Security's tax thresholds have been frozen since the 1980s, so annual COLAs can push more retirees into taxable territory even though the thresholds themselves don't move. Fewer than 10% of beneficiaries paid federal tax on their benefits in 1984, compared with roughly half today.

If Congress indexed those thresholds to inflation, fewer retirees would cross them simply because their benefits rose with prices. The small tax effect tied to a flat-dollar COLA would also become much less relevant.

Bottom line

A flat-dollar COLA could lower taxes slightly for some retirees, but the savings would likely be much smaller than the Social Security income they'd give up. Looking at the full effect on your monthly income gives you a better sense of whether the change would actually help.

You can also use that comparison to strengthen your retirement plan. The less you have to depend on one source of income, the easier it may be to handle future changes to Social Security or the tax rules without having to rethink your entire budget.

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