Income tax

Any income received in india directly from its source is taxable so any past income is not taxable in india as it is already taxed but if u get pension from ur employer directly then u need to pay tax in case of double taxation u can get benifit but u shud ask expert for detail. 

as first residential status is detemined as 

u r not fulfilling any basic condition u/s 6 so u r non resident .

in india for a residential person , pension is taxable subject to conditions.

as in japan how u taxed for dat.  also matter.

No, The Pension is not taxable in india, as it is just a transfer of money from japan to india...

otherwise, It will amont to double taxation

i donot agree with dheeraj as any income received in india is taxable both in case or resident and non resident. U can only get double taxation benifit if there is any