If you are a Singapore tax resident, your gift to NUS made during 1 January to 31 December is eligible for a tax deduction that is 2.5 times the gift value.
When the tax deduction for the donation is more than your taxable income (for both individuals and companies) for the year, the donor is allowed to carry forward unutilized deductions for a maximum of 5 years.
For example, a donation made in 2018 and allowed tax deduction in YA 2019, will be allowed to be carried forward (if tax deduction for the donation exceeds the income for 2018) up to YA 2024.
Donors (companies) must satisfy the shareholding test as defined in the Income Tax Act of Singapore.