Internal Revenue Service
Trust through transparency
Sources & Methodology
See the official guidance and research behind our lessons, calculators, readiness reviews, and planning rules.
Official first
We prioritize government agencies, regulators, and primary research.
Limits stay visible
Sources inform education and estimates; they don't remove household-specific assumptions.
Reviewed over time
Annual planning policies include verification dates so changes can be reviewed deliberately.
10 official sources
- Open official source (opens another site)
- Open official source (opens another site)
Internal Revenue Service
Operating a 401(k) plan
- Open official source (opens another site)
Internal Revenue Service
Qualified student loan payment matching guidance
- Open official source (opens another site)
Internal Revenue Service
Retirement Plans for Small Business, including designated Roth employer contributions
- Open official source (opens another site)
Internal Revenue Service
Roth comparison chart
- Open official source (opens another site)
Internal Revenue Service
SIMPLE IRA contribution rules
- Open official source (opens another site)
Investor.gov
Index funds
- Open official source (opens another site)
U.S. Department of Defense
Blended Retirement System
- Open official source (opens another site)
U.S. Department of Labor
Target date retirement funds
- Open official source (opens another site)
Vanguard
How America Saves 2025