You have to write a letter to them and redo your tax computation. Then submit them to the nearest office, and wait for their reply. However, doing amendment usually invites them to do audit on your tax filing. Good luck.
Don't worry about their mistake. Let's say your EPF contribution (your portion) should be RM1,000, but your employer deducted RM1,200, you still can claim RM1,200 relief, because it is their mistake. Just file your tax based on your EA form. Unless you've been paying RM1,200, BUT your EA forms appears that you're only paying RM1,000, if that's the case, go slam the door of the department that prepares your EA form.
The bayaran tunggakan part? Well, when you do your e-filing, there's a part to declare bayaran tunggakan stuff. Do login to your e-BE and see for yourself.
For your case, you have to submit B instead of BE. Declare your salary income in the Penggajian part, and declare your part time business in your Pendapatan Berkanun Perniagaan part. Do fill in the maklumat kewangan perseorangan and fill in your akaun perdagangan & untung rugi if you want to claim the travelling and other related expenses. Since you're earning 100k a year, I would recommend you seek help from Tax Agents.
Login to your e-BE and use the HK-3.
The rental income in your form BE is the net of your annual rental income. Make sure you prepare a rental statement similar to the above for your own record, and just in case they may want to audit your tax filing.

Tax on dividends received under the single tier dividend system are considered as final tax.
Dividends received under the imputation system can still claim Section 110 credit.
You have to read what your dividend vouchers say.

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Added on April 8, 2009, 12:13 pm
It is interesting to explore this :-

If the house is registered under your name, can your parent sign a rental agreement with the tenant and have the rental paid to them instead of you ? (assuming that your parents have no other income or in a lower tax bracket).

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Added on April 8, 2009, 12:15 pm
You are not allowed to deduct the whole loan repayment amount. Only the loan interests.

No, you can't do that.
You have to only put in the total PCB paid excluding your "bonus paid out" PCB.

I did that mistake all this years and last year they actually charged me back for 3 years. They recalculate and asked me to pay as I've under declared.

This year, I've put in the bonus paid out in "PENDAPATAN PADA TAHUN KEBELAKANGAN" and less out that specific PCB under the "PCB paid" section.

Correct.
Previously I added the RM137 into total PCD deducted/paid. That's why last year I received the notice to pay up due to I've constantly done that for 3 years. i.e. I under declared. I learned the mistake through the hard way

The RM137 would be in their system as it's PCB already paid. They can trace back, so no worries on that.
In the event if it's not enough to cover, they would come back to you and request for money.
Otherwise, you can actually do a yearly check on your account to see whether or not there's any excess payment and the ppl in LHDN would advise you on what to do.

You can actually use their help line. Quite efficient; I phoned in through the help line to request for installment payment for 6 months.

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Added on April 8, 2009, 10:36 pmYou have to compute the annual income to know.
The common misconception that everyone had is "no need to declare" if below certain amount of pay. It's wrong.
Any income also need to declare. The only issue is whether or not need to pay income tax.

Last time the officers of LHDN would tell you no need to declare as it's quite manual for them also. But since it's computerised, there's no worries.
The first time I declare, I'm requested to back date 2 years because there's some PCB contributions during than, so can't escape. But if you're sure you never got any PCB deduction before, than can close one eye no need to declare. But if you do....it's already in their system. You can't run.

Declare tax from Jan-Dec.

Look closely at your previous company EA form. If it is for salary Jan'08 to Dec'08, then you will declare it in year 2009. If it is salary for Jan'09 to Mar'09, then keep the EA form and declare it in year 2010.

Call up and get clarificaiton from your previous Jan-May'08 employer. If it is clear up as e.g. salary after leaving or bonus paid, etc. then just total up for Penggajian:
Jan-May'08 + May'08 extra + Jun-Dec'08 new job
= 11k + 2k + ??k

if u r in penang I suggest u do go lhdn.  they may even say, kenapa u kasih tahu, ini tak payah punya ...

worst case scenario is you file it correctly and pay more, its a good lesson to learn from the reliable correct source

trust me, this kacang putih not consider run tax, your experience after visiting them may help you really run tax in future ... go lah.

other states not sure coz no first hand experience, but above should generally apply everywhere

No... there is a special column for it on the BE form.

1) Your EA should show Salary : RM30,000 (RM2,500 x 12). Section G would show the RM6000 (RM500x12)
You don't get tax relief but your declare a lower income of RM30,000 (instead of RM36,000)

2) Sewa portion if you have a house which you rent to other people for income. In your case, it doesn't apply to you.

Ain't RM30,000 lower than RM35,000 ?
How do you get RM35,000 ?
RM350 is known as Tax Rebate not Tax Relief.... Tax Rebate is to reduce the total payable tax.

not work in malaysia = no pay tax to malaysia

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Added on April 17, 2009, 10:50 pm

all books, keep receive if audit occurs

Who knows is pornographic.

They dont chop on your receipts BUKU LARANGAN or Pornographic.

If the title is KAMASUTRA, do you think this is a buku larangan?

It can be a novel with words and without pictar.

oh really ? because last year my friend said can update back ...

btw, if you put the figure wrongly and if they found out, you only pay the amount that you need to pay ... but if you create fake receipt to con them then is different case and can go to jail already ...

Thanks trevor. I think that should help just fine. I haven't logged in to do my taxes yet (will do it at home) but isn't there a space for an employer code? So do I enter just one?

can i modify my e-filing after i submitted?i need to change some value which i filled wrong before

no everyone can online easily......like me.... 

Bonus 2007 and EPF put it into INCOME OF PRECEDING YEARS NOT DECLARED

i think the PCB amount for Bonus 2007 has been included in the EA Form PCB section there, isn't it?

actually there's no difference, in the end it will come out with the same figures. 

even if you want to put the PCB amount separately, where are you going to put the PCB amount in the "INCOME OF PRECEEDING YEARS NOT DECLARED"?  there are only 4 columns available and nothing mentioned about the PCB amount.

for what i usually do,  the PCB amounts will be added up to put in the Scheduler Tax Deduction slot.  Then you calculate your tax for 2008 and the revised computation for 2007.  Nett off the balance of tax to be paid/refund between 2007 & 2008 then pay the balance/wait for refund.  so far IRB accepts it