I'm glad to see that you are looking at these allowances, as solid paid-time-off policies can certainly be a recruiting and retention strategy. With today's workforce focused on personal time as a priority, these issues can be deal-breakers when dealing with the employee relations issues.
My suggestion is that you decide how you want to compete for employees, and adjust your policies accordingly. If you want to provide the "Cadillac" compensation and benefits package, then you want to offer leave that is better than your competing hiring companies in your market.
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Gayla R. Sherry, SPHR, CMC
President, Gayla R. Sherry Associates, Inc.
Helping organizations improve employee morale, retention and productivity
HR Consulting and Compliance; Training, Conflict Resolution, Internal Investigations, Expert Witness