The $6,000 deduction for seniors is not part of the standard deduction. It's a separate deduction on a different form. On your 2025 tax return, if you are married filing jointly and both 65 or older, your $34,700 standard deduction will be on Form 1040 line 12e. The $12,000 deduction for seniors will be on Schedule 1-A line 37. The total deductions from Schedule 1-A will be on Form 1040 line 13b, and may include other deductions besides the deduction for seniors. If you have no other deductions, the total deductions on Form 1040 line 14 will be $46,700, but other deductions could be included in line 14.
For married filing jointly the deduction for seniors begins to phase out if your Modified Adjusted Gross Income (MAGI) is over $150,000, so you might not get the full $6,000 per person.
Note that, since the deduction for seniors is not part of the standard deduction, you get the deduction for seniors even if you use itemized deductions instead of the standard deduction.
UPDATED: Corrected line number for standard deduction on Form 1040.
