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401(k) Plans and other tax-qualified retirement plans must comply with a number of tax filing and other important deadlines throughout the year. The list below is a summary of the common compliance deadlines for most calendar year qualified plans.
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| DEADLINE |
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COMPLIANCE TASK |
| January |
15 |
Census Data |
Return census data to July by January 15th for quickest turnaround on year-end testing and reports. |
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31 |
Form 1099R |
Trustee deadline for distributing IRS Form 1099-R to participants receiving plan distribution in previous plan year. |
| February |
15 |
Census Data |
Deadline for traditional 401(k) plans to return census data to July to ensure time for plan to meet deadline ADP / ACP refunds in case of failed test. |
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28 |
Form 1096 |
Trustee deadline for filing IRS Form 1096 report withholding on plan distributions during previous year. |
| March |
15 |
ADP Refunds |
Traditional 401(k) plans must make corrective refunds by March 15th to avoid 10% excise tax penalties on distributions. |
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Tax Deductions |
Corporations must fund contributions to the plan by March 15th tax filing deadline to claim tax deductions on previous year's corporate tax return. |
| April |
15 |
Tax Deductions |
Partnerships and Sole Proprietors must fund contributions by the April 15th tax filing deadline to claim tax deductions on previous year's partnership or individual tax returns. |
| July |
31 |
Form 5330 |
Deadline for filing IRS Form 5330 for previous plan year. This form is needed to report and pay certain exise taxes imposed on some qualified plans. |
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Form 5500 |
Deadline for filing IRS Form 5500 required annually of most qualified retirement plans. |
| September |
15 |
Funding Deadline |
Deadline for Money Purchase Pension Plans and Defined Benefit Plans to fund contributions under Minimum Funding Standards. |
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30 |
SAR |
Deadline for distributing the Summary Annual Report to plan participants reporting previous year's financial summary of the plan. |
| October |
15 |
Form 5500 |
Final deadline for filing IRS Form 5500 for plan sponsor's that received an extension of time to file. |
| December |
31 |
ADP Refunds |
Final deadline to make corrective distributions for traditional 401(k) plans that failed the ADP or ACP Test from previous plan year. |