MAGI: News & Articles

How Tax Bracket “Bumps” Can Cost Federal Employees

Understanding the progressive nature of the tax code can help federal employees both during their careers and after retirement.

By John GrobeDec 8, 2017 10:33 AM | Updated: Dec 16, 2017 5:09 PM Pay & Benefits, Q&A Leave a comment

I understand that my Medicare Part B premiums can be higher if my modified adjusted gross income is above a certain amount. How is MAGI calculated?

March 31, 2026

Fund	Last	%	YTD
G Fund	$19.7918	+0.01%	+1.04%
F Fund	$20.8902	+0.21%	+0.04%
C Fund	$104.7643	+2.92%	-4.34%
S Fund	$99.1781	+3.44%	-1.22%
I Fund	$56.5148	+2.28%	+1.84%
L Income	$29.3186	+0.78%	+0.26%
L 2030	$57.7723	+1.59%	-0.56%
L 2035	$17.5340	+1.83%	-0.82%
L 2040	$67.1123	+2.00%	-0.99%
L 2045	$18.5420	+2.13%	-1.14%
L 2050	$41.0174	+2.27%	-1.29%
L 2055	$21.0590	+2.74%	-1.73%
L 2060	$21.0565	+2.74%	-1.73%
L 2065	$21.0539	+2.74%	-1.73%
L 2070	$12.4783	+2.74%	-1.73%
L 2075	$10.8998	+2.74%	-1.73%
Get detailed TSP data at TSPDataCenter.com