Primary sources
Retirement contribution limits, distributions, tax basis and federal tax topics
Retirement ages, claiming information and personal benefit estimates
Mortgage, auto lending, debt, budgeting and emergency-fund guidance
Investing basics, fees, compound growth and 529 plan education
Historical CPI-U data and inflation context
Workplace retirement plan information and fee education
Web accessibility guidance and WCAG 2.2
Update cadence
- Retirement contribution limits are reviewed after the annual IRS announcement and before a new tax year.
- Social Security ages and claiming guidance are reviewed annually and after a material statutory change.
- CPI history is reviewed after BLS updates and before adding a newly completed year.
- Mortgage, auto and consumer disclosures are reviewed at least quarterly.
- State and local rules are reviewed before activation and carry an explicit effective and expiration date.
- External links are checked automatically, with a manual source review at least quarterly.
Expiration behavior
When a dated rule expires, we stop using it until it has been reviewed. The calculator will ask you to enter the value or mark the result as incomplete instead of quietly reusing last year's number.
Using a source responsibly
A linked source may describe eligibility, exceptions or definitions that a calculator cannot fully model. Read the current official material and the documents for your own account, loan or plan. A link does not mean the agency endorses this site.