WASHINGTON, Jan. 22--Sweeping curtainment of individual deductions will bite deeply into the income tax savings to be proposed by President Kennedy in his special tax message to Congress Thursday.

Changes will include an over-all limit on total personal deductions, covering charity contributions, interest paid, state and local tax payments, casualty losses, and medical costs.

Of the $3.5 billion to come from tax reform, close to $3 billion--or roughly 65 per cent--would come from the tightening of individual income tax rules.

Negro Voting Rights

OXFORD, Miss. Jan. 22--The Justice Department moved against another Mississippi county--its 11th so far--with a suit today charging racial discrimination in voter registration.

The suit, filed in U.S. Dist. Court here, named Circuit Clerk Cecil C. Campbell of Sunflower County and the State of Mississippi as defendants. Under Mississippi law, circuit clerks act as voter registrars.

Sunflower County, home of U.S. Sen. James O. Eastland, is located in the northwest Mississippi Delta country--a sparsely settled rural area where Negroes outnumber white persons more than two to one.