How do I write a salary increment for renewal of employment contract?

A salary increment for renewal of employment contract sounds kind of complex. The best thing to do is to use a standardised contract templates.

You can find one here: http://www.printablecontracts.com/

You'll also need to write a brief letter explaining exactly what the main changes in the contract are.

There are two parts that will need to be highlighted best on what you have asked:

1. The time period the new contract will be valid for. This is standard procedure for contract renewal.
2. What the increment in salary is in real terms.

Dear John Smith,

Please find enclosed your new contract.

This contract will commence from 21-03-14 and run until 21-03-15.

You will also notice a salary increment of 10% in regards to your previous salary, taking your earnings per annum to $110,000.

Regards,

Steve Jones.