In the late 1970s and early 1980s, one of the ways inflation reared its ugly head was through what’s known as bracket creep. Since the income cutoffs for different tax rates weren’t periodically adjusted for inflation, millions of Americans paid higher rates while their real incomes stayed the same.

Tax cuts initiated by President Ronald Reagan took care of that; since 1985, the Internal Revenue Service has taken inflation into account annually when it announces the income thresholds for the coming tax year. Yet while dozens of tax provisions are now adjusted for inflation every year, there are still plenty of significant ones that don't get the same treatment.

Take two popular tax breaks, the child tax credit and the credit that taxpayers get to help with child-care expenses. Both are flat amounts that don't take inflation into account. Similarly, the amount someone can write off for an investment loss has been stuck at $3,000 per year since 1978. And the deduction for business gifts has been set at $25 since 1962.

Unfortunately, whether a tax provision is inflation-adjusted is dependent on whether lawmakers believe there is enough money to allow for it when they are drafting legislation. More often than not, inflation accommodations are the first to go during negotiations in Congress—and then are easily forgotten. And so, we’re left with a U.S. tax code that’s a total hodgepodge.

Sure, gasoline prices may be cooling, but annual inflation remains north of 8% and food prices are still elevated. When inflation is high, those adjustments matter even more because they increase the value of tax credits and deductions. Without them, tax benefits effectively stay flat as everything else becomes more expensive. 

Another way things are skewed is when the income thresholds to qualify for certain tax credits and deductions, as well as those that trigger certain taxes (such as the net investment income tax), don't keep pace with inflation.

For example, the thresholds for owing the net investment income tax, which subjects those with higher incomes to a tax on investment income to help pay for Medicare, have been set since 2013 at $200,000 for single taxpayers and $250,000 for those married filing jointly. Adjusted for inflation, those cutoffs would now be $257,000 and $322,000, respectively, according to Alex Muresianu at the Tax Foundation.

Going back to the child tax credit, a helpful example from the Urban-Brookings Tax Policy Center shows how the lack of inflation adjustments can add up over time. If the current $2,000 credit stays the same, by 2032, it will be worth just $1,430, based on inflation projections from the Congressional Budget Office.

Remember, the child tax credit was increased as part of the 2017 tax overhaul to compensate for ending the personal exemption for dependents, which was the amount of money taxpayers used to be able to exclude from their income for having children. The personal exemption was inflation-adjusted, whereas the maximum amount of the child tax credit isn't.

The child tax credit was boosted again during the pandemic to help lower-income families, but that increase expired at the end of last year. So households that are suffering the most are receiving less and have no inflation adjustment to cushion the blow.

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