X0101 EFFECT 33 LIVE 2017-04-10 0000773674-17-000029 485APOS 0000773674 AMERICAN CENTURY GOVERNMENT INCOME TRUST 002-99222 S000005969 INFLATION-ADJUSTED BOND FUND C000016437 INVESTOR CLASS S000005969 INFLATION-ADJUSTED BOND FUND C000016438 A CLASS S000005969 INFLATION-ADJUSTED BOND FUND C000016439 R5 CLASS S000005969 INFLATION-ADJUSTED BOND FUND C000088038 C CLASS S000005969 INFLATION-ADJUSTED BOND FUND C000088039 R CLASS S000005969 INFLATION-ADJUSTED BOND FUND C000181796 I CLASS S000005969 INFLATION-ADJUSTED BOND FUND C000181797 Y CLASS