Hi PK,
I have the similar situation and the contribution had some tax relief (tax deductible) but I didn't know how much because it was contributed in 1998 and before. The computation was not straight forward and make it challenging because I can't remember the salary and I didn't keep the pay slip. In addition, I didn't keep a copy of the income tax I filed in Singapore.
Here is the link for your reference: https://www.iras.gov.sg/taxes/individual-income-tax/basics-of-individual-income-tax/tax-reliefs-reba...
