Many federal employees are unaware that a major TSP tax change is arriving in 2026.
And for some higher earners, it may significantly change retirement contribution strategy.
The change comes from:
SECURE 2.0
And it affects:
- Federal employees
- Military members
- Veterans with federal careers
- Higher-income TSP participants
What Is Changing in 2026?
Beginning in 2026, employees over a certain income threshold who make catch-up contributions will generally be required to make those catch-up contributions as:
Roth contributions
Instead of Traditional pre-tax contributions.
This is one of the biggest federal retirement tax changes in years.
What Are Catch-Up Contributions?
Catch-up contributions allow eligible employees age 50 and older to contribute extra money into retirement accounts beyond the normal annual contribution limit.
For many federal employees approaching retirement, catch-up contributions are a major retirement planning tool.
Who May Be Affected?
The rule generally applies to employees whose wages exceed a specific IRS threshold during the prior year.
That threshold is indexed and may change over time, but current guidance centers around approximately:
$145,000+
In wages subject to FICA.
This may affect:
- GS-13 employees
- GS-14 employees
- GS-15 employees
- SES employees
- Law enforcement with overtime
- Certain military officers
- Retirees with second federal careers
Traditional vs Roth Contributions
Traditional TSP
- Contributions reduce taxes today
- Withdrawals are taxable later
Roth TSP
- Contributions are taxed today
- Qualified withdrawals may be tax-free later
The 2026 rule specifically affects catch-up contributions for higher earners.
Why This Matters
Many employees used catch-up contributions primarily to reduce taxable income late in their careers.
The new rule changes that strategy.
Instead of additional pre-tax reductions, affected employees may now build larger Roth balances instead.
The Change Could Actually Help Some Retirees
At first glance, some employees dislike the rule because it may increase taxes during working years.
But larger Roth balances may also improve:
- Retirement tax flexibility
- Withdrawal planning
- Medicare IRMAA management
- Long-term tax diversification
For some retirees, that could become a major advantage later.
Federal Employees Already Have Taxable Income Sources
Many retirees already receive taxable retirement income from:
- FERS pension
- Traditional TSP
- Social Security
- Military retirement
Adding Roth diversification may create more flexibility later in retirement.
Veterans May See Additional Advantages
Disabled veterans with tax-free VA disability compensation may benefit even more from Roth diversification because:
- VA income is already tax-free
- Roth withdrawals may reduce future taxable income pressure
- Retirement cash flow flexibility may improve
This is a very under-discussed retirement planning topic for veterans.
Common Misunderstandings
“All my TSP contributions must become Roth.”
No.
The rule generally targets:
Catch-up contributions only
For affected higher earners.
“This makes retirement worse.”
Not necessarily.
The impact depends on:
- Retirement tax bracket
- Pension size
- Withdrawal strategy
- Roth balance growth
- Long-term retirement planning
“This affects everyone.”
No.
Lower-income employees may not trigger the Roth catch-up requirement.
Why This Matters for Retirement Modeling
Tax strategy becomes increasingly important later in retirement.
Employees should evaluate:
- Traditional vs Roth balances
- Future taxable income
- Withdrawal sequencing
- Healthcare-related tax thresholds
- Long-term retirement sustainability
The 2026 rule makes retirement tax planning even more important.
5 Common Mistakes Employees May Make
- Ignoring the rule entirely
- Assuming Roth is automatically bad
- Failing to diversify tax buckets
- Never modeling retirement taxes
- Waiting until retirement to think about withdrawal strategy
Key Takeaway
The 2026 Roth catch-up contribution rule may significantly change retirement tax planning for higher-income federal employees.
For some workers, it may increase taxes today.
But for others, it may create stronger long-term retirement flexibility through larger Roth balances and improved tax diversification.
What to Do Next
Review your retirement tax strategy:
Compare:
- Traditional vs Roth TSP balances
- Retirement tax projections
- Withdrawal strategies
- Net retirement income
Disclaimer
This article is for educational purposes only. Tax laws and retirement regulations can change. Always verify retirement and tax decisions with official IRS guidance and qualified professionals.