An individual may designate on the tax return of that individual a contribution to the veterans’ postwar trust fund of any amount of one dollar or more to be added to tax liability or deducted from any refund that otherwise would be payable by or to the individual. The tax commissioner shall notify taxpayers of this optional contribution on the individual state income tax returns. The tax commissioner shall transfer the amount of optional contributions under this section to the state treasurer for deposit in the veterans’ postwar trust fund.