Using other Heads to reduce taxable income

First of all you have to clarify head of income to which 12lacs related. Beside this only capital gains u/s 112 & 111A at lower tax rates are exclude from GTI. In other heads like Income from House property will get 30% standard deduction. In salary income also there is some allowances which is deductible from income. In other sources also there is some deductions is available. Agriculture income is fully exempt. So, if your income is crossing slab rate of 20% and taxable @ 30%, you have to check source and then bifurcation of income can be done. If source is not identifiable then 44AD can be used.