SRS works on the basis of tax deferral, not tax exemption. Let me use an example to illustrate the mechanics:
For simplicity, I will assume that the money in SRS does not generate any return. In reality, you will enjoy a base interest rate similar to a savings account should you decide not to invest it in instruments such as shares, UT, insurance, bonds etc.
Example Mr A
Age 32 year old in 2015, SRS withdrawal age at 62 (fixed at inception of SRS account)
Contribute S$13,333.33 per year for 30 years to have a total of S$400,000 in account by 62.
At 62, Mr A has 2 options:
1. Lump sum withdrawal, subjected to tax (50% concession) - Allows you to take out one shot 400k, of which 200k will be subjected to prevailing income tax
2. Equal amount withdrawal of S$40,000 per year for 10 years.
a. Based on S$40,000 withdrawal, 50% subjected to income tax
b. If Mr A is no longer drawing any income, he will be subjected to zero tax for the $40k per year that he can take out
Source :
https://www.iras.gov.sg/irashome/page04.aspx?id=3346
Example Mr B
Age 32 year old in 2015, SRS withdrawal age at 62 (fixed at inception of SRS account). Income at 80K and above bracket. Contribute S$10k per year for 5 years before losing his job
Based on 80K income with tax exemptions for first 20k, earned income relief, cpf contribution etc, Mr B will probably still be subjected to income tax rate of 7% for the highest tier portion of his income
.
Assuming he lost his job after contributing for 5 years, he would have 50k in SRS account. Assuming he withdraws 20K for usage, he will be charged a penalty for early withdrawal.
He will not be liable for income tax as first 20k is not subjected to tax. In this instance, the 5% penalty is lower than the 7% he would have attracted.
Tax saving 7% x 20k = $1400
LESS
Early Withdrawal Penalty 5% x 20k = $1000
Saved tax = $400
Tax saving 11.5% x 20k = $2300
LESS
Early Withdrawal Penalty 5% x 20k = $1000
Saved tax = $1300
Source for Income Tax Rate:
https://www.iras.gov.sg/irashome/page04.aspx?id=1190
In a nutshell, SRS is to defer your tax liability, with an attractive tax reduction proposition in exchange getting people to be more pro-active in managing their own retirement needs.
Of course, this may not be suitable for everyone so do refer to official source for more information.