Im afraid i dont know much but ill try to assist you okay with my limited knowledge...huhuhu...
Basically you need to check with tax office you have your file with...
Ask hr of your company to complete form CP21..nowadays they can fill it online via e-SPC..

You need to have last year EA Form (your hr should have it if ur previous tax matter being manage by company)..ask from them...

Complete this year BE Form and please make a copy for all pages in ur passport for verification purposes...

This letter is a proof that you have clear all money owed to irb before left the country. ..normally hr will hold ypur last salary payment any payment that you should receive from the company before irb issue tax clearance letter...if u have money owed to them, they will deduct and credit you the balance later...

Complete all document and irb shall process it within 14 working days (nowadays is more efficient)..and a week after, if no prob...they will post you the tax clearance letter at your former employer...to notify the balance of amount owing by you to irb in that letter and hr will deduct the amount to be paid accordingly to irb...

This letter normally will affect you for obtaining employment pass...because they want the liability owed by former company and soon by new company is not clashed...

Just do this...
Ask hr whether they already did or fill the CP21 Form
Get your EA Form last year copy(all last year/s)
Fill up this year BE Form
Make a copy for all pages in your passport...
Your friend can collect the letter for you...most important submit document that ive mentioned above and let irb do their job...if u nasib baik..2 weeks can get already...if not one month...
Just do it or else later irb will find you and ask why you didnt do clearance before leaving...

This is from my little knowledge...apologise if not complete process...

This post has been edited by niafaz89: Jun 5 2016, 03:11 AM

Sorry..
If you have paid tax for few years...like you work and have EA Form from 2012-2015...please get all of them and bring it to IRB..better prepare if they ask u all EA Form...

Is this inter company transfer or not?
Means your current employer know about you will be leaving soon?
Coz ive seen a case where former employer dunno he"ll leave for overseas and so they just file Form CP22A and he wrote a letter to Irb mentioning that he"ll no longer working in Malaysia. ..
So im not sure which one in your case

AND you have to submit all this document at IRB Branch in which your file being located...

No need...cause the first requirement to be deem liable for tax payment is resident test...if you are staying in malaysia for more than 182-183 days...thus you are subject to tax law under malaysian income tax law...

No need...this is part of double tax agreement entered by around 150++ country around the world...you will be taxed at the country where you deem as resident and subject to that land tax law...you income from oberseas is tax exempt according to the 2004 circular regulation...

In your case, you are not subject to tax payment to lhdn but to singapore authority...you might want to check with them...

Does this inter company transfer? Means are u serving same company but different branch/department or completely different employer?
If same..hr will do it...if not they only will fill up Form termination of employee ( assuming they dont know you will migrate), then you need to fill it by yourself...

You dont need to wait as employer (previous) will hold the salary and deduct it if any amount stated at tax clearance letter...just put the mailing address to your old company. ..after hr settled with it, ask your friend to keep it for you or scan it for your further references .