It seems that the Israel Tax Authority is trying to keep up with technology.
As from the year 2012, employees who are employed simultaneously by at least two and up to six employers with a total income of no more than 188,544 shekels (gross) can file their request for a tax reconciliation (teum mas) via the internet. (This is instead of filling out a 166 tax form, going in to your local tax office and waiting in line while losing valuable work hours)
You are able to print out a copy of what you reported for your records and the Tax Authority will send the employee, to the address you specify, the required letters for each of the employers with instructions on how to deal with the tax from what each of them are paying via payroll. This is usually done within a few work days and can save you the trouble of going in each year to renew the letters for your employers.
Note: You can only file online one time during the tax year. If there are any changes you will need to go personally to your local tax office to update the letters for the employers.
They have a simulator for taxes without a need to submit the information.
The taxes are not final, pending filing year end taxes for all the employee’s earnings. This is done by the employers, employees are exempt from this unless they have income other than salary. In any case, to check whether you are required to file taxes it is advisable to consult an Israeli certified CPA or Tax advisor.
You need to be very careful to correctly fill out all the information requested, as any mistake will result in wrong output. Before you attempt to do this make sure you have the last payslip from all employers on hand. The payslip has the employer’s name, address and tax ID number as he is registered with the Tax Authority.
You will first need to download and install a Toolbar for Government forms and you need to be using Internet Explorer (versions 6,7,8,9) or Firefox (versions 3-11) and either Windows or Linux OS
http://forms.gov.il/forms/Resources/DowloadSetup/AGFormsDownloadToolbarEnglish.htm