Check your most recent pay stub for 401(k) deductions
Review your employer benefits portal or HR account
Log in to your retirement plan provider’s website
Look through old W-2 forms for retirement contribution codes
Search your email for plan enrollment, statements, or provider messages
Contact your former or current employer’s HR or payroll department
Check old bank or investment statements for automatic contributions
Use the U.S. Department of Labor’s lost retirement account search resources
Search the National Registry of Unclaimed Retirement Benefits
Contact the plan administrator listed on old account documents
Review old tax returns for retirement plan references
Check whether your 401(k) was rolled over into an IRA or new employer plan