NEW DELHI: The Modi government's much publicised Income Disclosure Scheme IDS ), a four-month window to declare domestic black money , that closed on September 30 has received a little over Rs 6,700 crore as the first instalment of tax that was to be deposited by November 30.The tax windfall of Rs 30,000 crore expected by September next year as a result of the disclosures is likely to fall short. Estimates have put the shortfall at Rs 5,000 crore. The I-T department has received 100% of tax in some cases but the final figure can vary as some disclosures have turned out to be bogus.The four-month IDS window, between June and September, saw disclosures of over Rs 67,000 crore in unaccounted assets. At a penalty and tax of 45% (including surcharge and cess) on the total disclosed amount, the government had expected to net over Rs 30,000 crore.As disclosures were lower than expected during the first three months of the scheme, the government had allowed an option to hoarders of black money to pay tax in three instalments - first instalment of 25% of the total tax by November 30, next 25% by March and the remaining 50% by September 2017.An I-T officer said that they were expecting lesser receipts as some disclosures proved to be bogus, while in some cases the total tax was paid at the first go.In prompt action against bogus disclosures, the I-T department had raided a Hyderabad realtor in the first week of December when he failed to deposit the first instalment. He had disclosed unaccounted income of Rs 9,800 crore under the IDS. Some other large disclosures were also discounted on suspicion of being dubious.A few reports suggested that in some parts of the country, business rivals had filed bogus online disclosures about each other. In a dozen such cases, disclosures amounted to over Rs 2,500 crore and turned out to filed with no knowledge of the person or the directors of the company.In a similar instance, a Mumbai family, on interrogation by I-T officials, claimed that they had no knowledge of their disclosure of Rs 2 lakh in black money. The I-T department did not accept the disclosure and that of another businessman from Ahmedabad who claimed to have unaccounted income of Rs 13,800 crore.After closure of the amnesty scheme, the government had announced that Rs 65,250 crore in unaccounted income was disclosed in as many number of declarations. The government revised its figures in the first week of December, putting disclosures at Rs 67,382 crore from 71,700 declarants.Post-demonetisation and the subsequent tax amendments that proposed levy of a tax of up to 83% on seizure of unaccounted cash, there were many who wanted tax authorities to allow them to make fresh disclosures under the Income Disclosure Scheme.The government refused but offered another window with higher penalty through fresh amendments in the tax laws.The new offer was to make a disclosure, pay 50% tax and keep 25% value of assets under lock in with the government's proposed Garib Kalyan Yojana for four years or face prosecution and tax liability which may go up to 95%.The noose is tightening around the corrupt and tax evaders with the I-T department carrying out close to 590 raids across the country since November 8 when demonetisation was announced. The I-T searches have since unearthed more than Rs 2,600 crore in unaccounted income and about Rs 400 crore in cash seized.