A general rule of thumb is that any amendment should be signed a minimum of 1 week before it takes effect, but the legal standard is “reasonable notice.”
All amendments should have an effective date that is clearly communicated.
Any “substantive change” in an employment contract should have an amendment, such as a change in role, responsibilities, compensation, benefits, etc.
Usually, we would recommend that a change in role should be paired with a completely new contract that communicates that it supersedes any existing contract.
HR Insider staff