Every January, millions of Americans file their taxes the same way they always have, typing in whatever number they remember from last year.
That habit can cost you real money this season, because the standard deduction changed again for 2025 returns.
For the 2025 tax year, the standard deduction is $15,000 for single filers and $30,000 for married couples filing jointly, according to IRS inflation adjustments.
Each of those figures is up $400 for single filers, $800 for joint filers, and $600 for heads of household compared with 2024.
Because the standard deduction is the flat amount you subtract from your income before taxes are calculated.
If you earn $60,000 as a single filer, you are only taxed on $45,000, not the full amount.
A bigger deduction means a smaller taxable income, which usually means a smaller bill or a larger refund.
The catch is that you have to pick between the standard deduction and itemizing.
Itemizing means adding up specific expenses like mortgage interest, state taxes, and charitable donations.
For most households, the standard deduction wins simply because those itemized totals do not add up to $15,000 or $30,000.
Roughly nine in ten filers take the standard route.
If you are 65 or older, or legally blind, you can add an extra deduction on top of the base amount.
For 2025, that bonus is $2,000 for single filers and $1,600 per qualifying person for married couples.
So an older married couple where both spouses are 65 could deduct $33,200 without itemizing a single receipt.
Retirees and older filers should also check a newer break that took effect this year.
A temporary senior deduction of up to $6,000 per qualifying person age 65 and up was added for 2025 through 2028, though it phases out at higher income levels.
If you are near that age range, it is worth running the numbers both ways before you file.
A few practical moves can keep you from leaving money on the table.
First, do not copy last year's software entry without checking the current form.
Second, if your itemized expenses land close to the standard amount, calculate both and pick the bigger one.
Third, if you made large charitable gifts or paid a lot of mortgage interest this year, that is the year to itemize, even if you usually do not.
Bunching deductions, meaning you push charitable giving or other expenses into one year to clear the standard threshold, is a common strategy for people who normally fall just short.
It does not work every year, but it can pay off when your giving or medical costs are unusually high.
The bigger picture is that the standard deduction has climbed steadily since 2018, and it will shift again with inflation.
That is good news for simplicity, but it also means the number you memorized is probably stale.
Our take: treat the standard deduction like a grocery price.
It changes, and the people who check current numbers come out ahead.
Final Thoughts
Spend five minutes confirming your filing status and age-related additions before you hit submit, because the difference is real money in your pocket.