Sometimes you will want the effective date to be different from the date of signing, either earlier (i.e., backdating) or later (i.e., predating).
Either is acceptable, provided that both you and the other party intended it.
Here's a story to illustrate: Jim and Carter agree on a barter arrangement.
They may be legal, depending on the circumstances, but they may not be helpful if the agreement must be taken to court.
It’s likely that the written contract addresses many more issues than were covered by the oral agreement, making the written contract different from the oral agreement.
Let’s take a look at the different possibilities, and what you need to know to understand the all-important “when” of an agreement.
If a contract does not specify its effective date, it goes into effect on the date it was signed by the person to whom the contract was offered for a signature.
New and modified terms of a contract can occur where an employee has been with an employer for a long period of time and where there have been changes such as promotions, organizational restructuring, increases to remuneration and other factors, which have been mutually agreed to, either expressly or by the parties’ conduct.
Some terms in an employment contract may be implied.