Calculating the Senior Deduction

The tax laws have changed. Starting in 2025, those aged 65 at year-end can generally claim an additional deduction (referred to as the senior deduction or the Enhanced Deduction for Seniors) of up to $6,000 per person. 

Below I discuss how to calculate the senior deduction, how to optimize planning for the senior deduction (starting in 2025!), and offer thoughts on the future of the senior deduction. 

Standard Deduction or Itemized Deductions

One excellent feature of the senior deduction is it applies regardless of whether one claims the standard deduction or itemized deductions. The senior deduction is in addition to either the standard deduction or itemized deductions. 

Senior Deduction Calculation

The maximum senior deduction is $6,000 per person per year. It is not indexed for inflation.

Two things eliminate the senior deduction. The first thing that eliminates the senior deduction is not having a valid Social Security number (see Section 151(d)(5)(C)(iv)). The second thing that eliminates the senior deduction is filing as “married filing separately” (see Section 151(d)(5)(C)(v)).

One thing reduces or eliminates the senior deduction: having modified adjusted gross income (“MAGI”) above certain thresholds. 

For singles, the MAGI threshold is between $75,000 to $175,000. Within that threshold, the senior deduction is reduced 6 cents on the dollar. MAGI at or above $175,000 eliminates the senior deduction entirely. The MAGI threshold amounts are not adjusted for inflation. 

For those filing married filing jointly, the MAGI threshold is between $150,000 to $250,000. Within that threshold, each person’s senior deduction is reduced 6 cents on the dollar. Effectively, this means a dollar of income within the threshold reduces the total senior deduction 12 cents on the dollar. MAGI at or above $250,000 eliminates the senior deduction entirely. Again, the MAGI threshold amounts are not adjusted for inflation. 

MAGI for Senior Deduction Purposes: For the vast majority of readers, MAGI will simply be the adjusted gross income (“AGI”) reported on the tax return. However, three items are added back to determine MAGI: excluded foreign earned income/housing income, excluded income from certain U.S. territories, and excluded income from Puerto Rico. 

Senior Deduction Examples

Let’s start with Sally. She is single and turns 66 during 2025. Thus, she is eligible for the senior deduction. In 2025, her AGI and her MAGI is $100,000.

Here is her 2025 senior deduction is computed:

Letter	Item	Amount
A	Modified Adjusted Gross Income	$100,000
B	Initial Threshold Amount (Single)	$75,000
C	Excess MAGI (A minus B, cannot be less than $0)	$25,000
D	Reduced Deduction (C times 6 percent)	$1,500
E	2025 Senior Deduction ($6,000 minus D)	$4,500

Let’s move onto a married couple filing jointly. George and Lucille file married filing jointly and both turn 66 during 2025. Thus, they are each eligible for up to $6,000 of senior deductions. In 2026, their AGI and their MAGI is $162,000.

Here is how their 2025 senior deduction is computed:

Letter	Item	Amount
A	Modified Adjusted Gross Income	$162,000
B	Initial Threshold Amount (MFJ)	$150,000
C	Excess MAGI (A minus B, cannot be less than $0)	$12,000
D	Reduced Deduction (C times 6 percent)	$720
E	2025 First Spouse Senior Deduction ($6,000 minus D)	$5,280
F	2025 Second Spouse Senior Deduction ($0 unless both spouses are at least age 65 by year end. If both are at least 65 at year end, enter the same amount as “E”)	$5,280
G	Total Senior Deduction (E plus F)	$10,560

Senior Deduction Optimization Planning

How does one plan to optimize for the senior deduction?

My favorite tactic, for those who can afford to, is to delay claiming Social Security benefits. That helps keep income lower longer in one’s mid-to-late 60s, increasing the odds they can claim the senior deduction. Delaying Social Security also increases the chances one can claim a full senior deduction and either (i) do an advantageous Roth conversion or (ii) benefit from the very favorable Hidden Roth IRA. 

A second favored planning technique to optimize the senior deduction is to keep ordinary income as low as possible in retirement. Tactics that further this objective include holding all taxable bonds and taxable bond funds in traditional retirement accounts and avoiding nonqualified annuities. 

Senior Deduction Tax Return Reporting

The senior deduction is computed on Part V of a new tax return schedule, Schedule 1-A, Additional Deductions, filed with one’s annual federal income tax return.

The Future of the Senior Deduction

The new senior deduction is scheduled to expire on New Year’s Day 2029. My personal view is that outcome is unlikely to occur. 

Two other tax deductions expire at the same time: the deduction for some tip income, and the deduction for some overtime income. It’s doubtful that Congress will allow seniors, waiters, waitresses, and blue collar workers to all face a significant overnight tax hike. I strongly suspect all three tax cuts will be extended such that they do not expire in 2029.

We have just seen this play out. Many advisors encouraged Roth conversions “before the 2017 TCJA tax cuts sunset.”

Yes, the higher standard deduction and lower tax brackets were originally scheduled to sunset at the end of 2025. Did that sunset happen? No!

Tax Planning To and Through Early Retirement Book

Cody Garrett and I wrote what we believe to be one of the first books to tackle the new senior deduction and the 2025 tax law changes in a serious way. 

Tax Planning To and Through Early Retirement is available on Amazon. It tackles retirement tax planning considering the new tax planning environment. 

Conclusion

The new senior deduction has a rather straightforward calculation, as I demonstrated above. Retirees should be attentive to monitoring income to help optimize for the senior deduction. 

FI Tax Guy can be your financial planner! Find out more by visiting mullaneyfinancial.com

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This post is for entertainment and educational purposes only. It does not constitute accounting, financial, investment, legal, or tax advice. Please consult with your advisor(s) regarding your personal accounting, financial, investment, legal, and tax matters. Please also refer to the Disclaimer & Warning section found here.