@OP I’m in the same scenario and thought about the same thing. Although HR told me it takes about 4 weeks from signing severance letter until getting severance check, I’m waiting until Jan 2026 to sign. That way it’s guaranteed to be taxed in 2026.
Here’s a ChatGPT answer:
The lump-sum severance payment will be taxed in the year it is received by you.
Here is a breakdown of why this happens and the important tax implications for you:
- The IRS Rule: Year of Receipt
The IRS follows the "constructive receipt" doctrine for cash-basis taxpayers (which most individuals are). This means income is taxed in the year it is received or made available to you.
Payment Date: If the employer processes and issues the lump-sum check or direct deposit on any day in December 2025, that amount must be included in your 2025 wages.
Form W-2: Your employer will include the entire severance amount in Box 1 (Wages, Tips, Other Compensation) of the W-2 they issue to you in January 2026 for the 2025 tax year.