How to say “Politely deny responsibility” professionally

Level 1: While I appreciate you considering me for this, my current bandwidth is fully allocated to [Project A] and [Project B], which are high-priority. Could we clarify the primary owner for this task, or reprioritize my existing commitments to accommodate it?

Level 2: Thank you for bringing this to my attention. Based on our agreed-upon Q3 objectives, this particular initiative doesn't align with my immediate deliverables. Perhaps [colleague's name] or [team name] might have the relevant expertise and capacity for this?

Level 3: I understand the urgency here. However, per the latest resource allocation matrix and my outlined contributions in the project charter, this specific item was assigned to [Another Department/Team]. I'm happy to forward the original documentation if that assists in locating the designated owner.

Level 4: My focus is currently on delivering [Key Outcome] for [Project Name]. Taking on this additional responsibility would directly impact the deadline for that critical deliverable. We need to decide which takes precedence, or assign this to a different resource.

Level 5: Not my job.

Level 1: I understand your desire for this functionality. However, based on our mutually agreed-upon Statement of Work (SOW), this specific item falls outside the current project scope. We would be happy to discuss a change request to incorporate it.

Level 2: We appreciate your expanded vision for the project! This enhancement introduces new requirements that extend beyond the parameters defined in our initial proposal. Our account manager can provide details on how we can incorporate these exciting additions.

Level 3: We value your creative input and appreciate you thinking outside the box. As per the detailed deliverables schedule and signed scope documentation, this would constitute a new engagement. Our pricing for 'scope adjustments' is quite transparent.

Level 4: This request is not covered by our current agreement. Proceeding with it would require a formal change order and a revised timeline. We cannot move forward until those terms are established.

Level 5: Pay us more.

Level 1: Thanks for reaching out, but my plate is quite full with [Project X] right now. I won't be able to take this on. Have you checked with [relevant team member] who specializes in this area?

Level 2: I appreciate you thinking of me, but this task seems more aligned with [Coworker's Team/Skillset], as they have the direct context. I'm sure you have the necessary information to proceed effectively.

Level 3: That's an interesting challenge, though it appears to fall under the responsibilities outlined in your onboarding documentation for [Specific Role]. I'm confident your expertise will allow you to navigate it successfully.

Level 4: I understand you need assistance, but this is outside my current responsibilities and capacity. My focus must remain on my assigned deliverables. You'll need to find another resource for this.

Level 5: Do your own work.