Fooling the IT returns system by using all zeros as Aadhaar number Central Board of Direct Taxes had issued a circular, making it mandatory to provide Aadhaar or the enrolment number with IT returns for everyone Even as the government is in overdrive to get people to link their Aadhaar number with the income tax (I-T) department while filing returns, some of those without the unique identification number have managed to find a loophole in the system. They say they have been able to file tax returns by putting in all 0s or 1s instead of the 12-digit Aadhaar. The drive to link Aadhaar with I-T returns started in July last year. Central Board of Direct Taxes had issued a circular, making it mandatory to provide Aadhaar or the enrolment number with IT returns for everyone who was eligible for the unique identification number. The same condition applied for those applying for the permanent account number, too. However, many still do not have an Aadhaar card and are holding out ti