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Article:

Eight Factors That Can Affect Your Pay

6. Professional associations and certifications

Certifications and memberships in professional organizations or trade associations can have a positive Affect on pay. However, if a job calls for a certification you don't have your pay might be set at the lower end of the range. Some employers require employees without certifications to work toward them.

Negotiation tip: If you have a certification that is optional, but considered a plus, that means you can expect to earn a little more because of it.