Since Trump's tax changes very few people itemize - it is very difficult to get about the standard deduction. The average person doesn't even have enough income (the standard deduction is about a third the average income, the odds that someone at that wage level is spending enough on deductible things is small, there are too many non-deductable things they also need to buy).
Of course it depends on where you live - in San Francisco if you can afford a house at all you have enough interest to deduct it (especially at today's rates), but other areas have more sane housing prices and lower incomes.
I think you can still easily reach if you, say, tithe 5 or 10% of your (post-tax even!) income (to a church or other 501-c-3) and have a mortgage and pay property taxes in a major metropolitan area. (Also if you're single the standard deduction is half married filing jointly.) (I didn't realize the personal exemption is gone now too!!)
But a quick google says... according to the IRS in 2022, 139.2 out of 154.3 million tax returns took the standard deduction, which is indeed around 90%. (Looks like up from 87% in 2020 maybe). So, true, defintiely most people, but still 10% not.
It looks like maybe pre recent Trump standard deduction changes (which were phased in), as many as 30% of filers itemized. (Still a minority to be sure).
I wonder if charities have seen a big hit in donations, if the itemized deductions people are no longer taking were an incentive.
The cash donations on top of the standard deductions phased out this year. This year, as far as I could tell, only way to deduct cash donations was itemizing.\
Of course it depends on where you live - in San Francisco if you can afford a house at all you have enough interest to deduct it (especially at today's rates), but other areas have more sane housing prices and lower incomes.