Sorting your priorities comes first
Needing to decline requests is usually a sign your workload is already full. Reviewing your current priorities first gives you a much clearer basis for deciding which requests to accept and which to turn down.
How you phrase a decline matters as much as a written email
If you are unsure how to phrase a decline in a document or a message, it is worth spending time getting the tone right -- polite but clear -- since the same wording principles that make for good professional email etiquette apply here too.
Frequently Asked Questions
Can I decline a request from my manager?
Rather than a flat "I cannot do it," sharing your current workload and priorities and asking your manager to help decide what should come first is usually an easier approach for them to accept.
Will declining requests often hurt my performance review?
Declining out of habit without justification can hurt you, but a decline backed by a clear reason and a proposed alternative is often seen as a sign of good workload management rather than a negative.