With the October 15 extension deadline approaching, taxpayers should also review the 2026 tax year's updated standard deductions, tax brackets, and retirement contribution limits.
October 15: The Final Deadline for 2025 Returns
Taxpayers who requested a six-month extension to file their 2025 federal income tax returns must submit their filings by October 15, 2026. It is important to remember that while this extension provides additional time to organize records and file paperwork, it did not extend the time to pay taxes owed. For most calendar-year taxpayers, the payment deadline was April 15, 2026. Balances not paid by that date may be subject to interest and late-payment penalties. Those who fail to file by the October 15 deadline may face failure-to-file penalties, which are typically 5% of the unpaid tax for each month the return is late, up to a 25% cap.
2026 Standard Deduction and Tax Rate Schedules
For the 2026 tax year, the IRS has implemented annual inflation adjustments for more than 60 tax provisions. The standard deduction has increased to $32,200 for married couples filing jointly, $16,100 for single taxpayers and married individuals filing separately, and $24,150 for heads of household. The seven federal income tax rates remain at 10%, 12%, 22%, 24%, 32%, 35%, and 37%. For 2026, the top 37% marginal rate applies to single filers with taxable income exceeding $640,600 and married couples filing jointly with income exceeding $768,700.
Retirement Plan Contribution Limits for 2026
The IRS has increased contribution limits for several retirement vehicles for the 2026 tax year. The elective deferral limit for employees participating in 401(k), 403(b), and most 457 plans is $24,500, up from $23,500 in 2025. The catch-up contribution limit for those aged 50 and older is $8,000, except for employees aged 60 through 63, who have a higher catch-up limit of $11,250 for 2026 under SECURE 2.0 provisions. For Individual Retirement Arrangements (IRAs), the annual contribution limit has increased to $7,500, with a catch-up limit for those 50 and older adjusted to $1,100.
Primary sources and further reading
- IRS Revenue Procedure 2025-32 (Inflation Adjustments for 2026)
- IRS Notice 2025-67 (2026 Retirement Plan COLAs)
- IRS Form 4868 Instructions: Application for Automatic Extension of Time To File
Tax rules depend on the tax year and individual circumstances. Confirm the current IRS guidance before filing.