Is it possible to restrict updating a column in SQL without using a trigger ? If so how ? (need the query)

PS:

I mean, I have a table

CREATE TABLE MYBUDGET.tbl_Income
(
    [IncomeID]          INT             NOT NULL IDENTITY(1,1),
    [IncomeCatID]       INT             NOT NULL,
    [IncomeAmnt]        MONEY           NOT NULL,
    [IncomeCurrencyID]  INT             NOT NULL,
    [ExchangeRateID]    INT             NOT NULL,
    [IncomeAmnt_LKR]    MONEY           NOT NULL,
    [AddedOn]           DATETIME        NOT NULL,
    [Remark]            VARCHAR(250),
)

I need to allow users to update only [ExchangeRateID] and [IncomeAmnt_LKR] fields. All other fields can not be updated. only insert.