Can my current(soon to be old) employer contact my new company regarding the offer ? Ie validate the offered package etc without my permission ?
closed as unclear what you're asking by IDrinkandIKnowThings, Masked Man, gnat, Chris E, TrueDub Nov 11 '16 at 9:29
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Unless the new company is very small the old company is unlikely to get in contact with somebody that has the offer info.
Larger companies will only confirm dates of employment, which doesn't apply to you because you haven't started. They will only supply salary info if the employee give permission. This is generally done when an employee wants to be able to give salary info to a bank for a loan. They won't give it out to old, current, new or potential employers. They only disclose it if you have explicitly identified the 'bank' that will be requesting the information.
If the new company did give this out I would not feel comfortable joining the company. They should have no reason for giving your salary information to a competitor.
All employee information is confidential either by law or by company policy, especially the compensation package that your new employer is giving you.
Your new employer expects you not to discuss your compensation package with their staff, so I have difficulty imagining a scenario where your new employer is freely discussing your compensation package with your old employer. There could be restraint of trade issues if your new employer and your old employer are competitors.
And it does not make too much sense for your new employer to volunteer info your compensation package to your old employer. Why? So that your old employer comes up with a counter offer?