While joining company I had put my major salary , component under basic head and not had structured much into Hra component. Now I realized that company policy is that once defined I can never reduce My basic. So now even if I increase my hra , my tax outflow is huge due to my fixed high basic. Question is that now while filling tax return every year, in itr form can i fix it by reducing my basic and increasing my hra to fix this issue and get refund ? My form 16 also have this High basic amount causing a big tax outflow. Please help and advise if I can file this different basic amount than what my form 16 states.