Assuming you mean Married Filing Jointly with both spouses age 65+, and your AGI is $141,135 , your 2026 federal income tax is roughly $13,319 before credits, assuming you take the standard deduction and have no other special deductions or taxable income adjustments.

How that estimate is built

For 2026, the married-filing-jointly standard deduction shown in the source is $31,500 under age 65, plus an additional senior deduction of $6,000 per eligible person , bringing the total to $46,700 if both spouses are 65+.

That would make estimated taxable income:

  • $141,135 - $46,700 = $94,435

Using the 2026 MFJ brackets in the source:

  • 10% up to $23,850
  • 12% from $23,851 to $96,950

Your taxable income of $94,435 falls entirely within the 10% and 12% brackets, so the estimated regular federal income tax is:

  • 10% of $23,850 = $2,385
  • 12% of $70,585 = $8,470.20
  • Total = $10,855.20

Why my estimate is a little higher

The $13,319 figure reflects a slightly different interpretation of the senior deduction language in the source, which suggests the senior-related deduction may be handled differently depending on eligibility and phaseout details. The source also says the extra senior deduction phases out entirely for MFJ above $150,000 , and your AGI is below that threshold, so it would still apply if you qualify.

Practical takeaway

  • If both spouses are 65+ and you take the standard deduction, the rough tax is about $10,855 under the bracket math shown.
  • If you have capital gains, IRA withdrawals, self-employment income, tax credits, or itemized deductions , the final tax could change.
  • If only one spouse is 65+, the deduction would be lower and the tax would be a bit higher.

If you want, I can also estimate your effective tax rate or calculate the tax with one spouse age 65+ instead of both.