TDS regime under GST takes off from 1st October 2018: Government procurements alone targeted for the time being
The TDS rate is 2 percent on the value of goods or services supplied ignoring GST. And there is an exemption from TDS requirement for the value of contract not exceeding Rs 2,50,000

Income tax law is replete with the tax deduction at source (TDS) provisions so much so that it accounts for more than 25 percent of the income tax collections for the exchequer. A bulk of it comes from the salaried class whose tax liability is practically met through TDS. The other major mode of income tax payment i.e. advance tax does not bother the salaried class because TDS from salary is the actual tax and not a mere ad hoc deduction insofar as is the case with other incomes.
TDS serves two purposes---collect the tax as it is earned and foil tax evasion. When tax howsoever small is deducted at source, the person comes under the tax authorities’ radar. He cannot remain impervious to the payment of the balance amount of tax if any now that the tax authorities know about him and will hound him till he complies. Much the same is sought to be achieved by the GST authorities with TDS.

Representational image. Reuters
The pincer of TDS and GST’s much-vaunted self-policing mechanism is supposed to foil tax evasion. A rotten fish can contaminate the entire pond. Likewise, if a trader evades GST, all traders down the line after him in the supply chain would be denied the input tax credit. It is therefore in everyone’s interest in the supply chain to ensure that his predecessor has paid the GST. That despite this innate self-policing mechanism, TDS has been mandated shows that the GSTN is not fully geared to automatically track the tax evaders. In other words, the self-policing software is not yet fully ready. But then TDS, in any case, expedites tax collection and thus may continue even when the self-policing mechanism is fully in place and fool-proof.
As it is, the following entities are required to deduct tax at source from the payments for goods or services:
• A department or an establishment of the Central Government or State Government; or
• Local authority; or
• Governmental agencies; or
• Such persons or category of persons as may be notified by the Government under which residuary category the following persons have been notified:
• An authority or a board or any other body which has been set up by Parliament or a State Legislature or by a government, with 51 percent equity ( control) owned by the government.
• A society established by the Central or any State Government or a Local Authority and the society is registered under the Societies Registration Act, 1860.
• Public sector undertakings
It is clear that to start with the government has not cast the TDS net for GST far and wide. Instead, it has, by and large, confined it to government and instrumentalities of governments. The TDS rate is 2 percent on the value of goods or services supplied ignoring GST. And there is an exemption from TDS requirement for the value of contract not exceeding Rs 2,50,000. There is one more exemption--- no deduction of Tax is required when the location of supplier and place of supply is different from the State of the registration of the recipient.
There were about 15.5 lac assessees who had registered themselves under the GST compounding scheme as of November 2017. Dealers with turnover not exceeding Rs 1.5 crore are eligible for registration under this scheme. They need to pay just a 1 percent tax irrespective of whether the goods they are dealing in attracts 18 percent or 28 percent for that matter. Should they be pitted against the government or its above-mentioned instrumentalities, their payments would be whittled down by 2 percent TDS.
The extra 1 percent TDS vis-à-vis their actual tax liability of 1 percent under the compounding scheme would be refunded. In other cases i.e. the ones not covered by the compounding scheme or ones that have deliberately opted out of the compounding scheme despite being eligible so as not to deny input tax credit for themselves and other down below in the supply chain, TDS would be a partial discharge of their actual tax liability pro tanto.
One wonders why the government has not co-opted the listed companies in the private sector under the GST TDS regime given the fact that they too have the wherewithal to function as governments’ tax collector. Perhaps it might follow soon.
(The author is a senior columnist and tweets @smurlidharan)
also read

The economy is recovering but volatile oil prices and rising NPAs could throw a spanner in the works
The economy is showing all the signs of a healthy recovery, with a V-shaped recovery in GDP, an increase in investments and higher direct tax collections

GST @ 18% on commercial rent: Reasons why builders are likely to shift to residential construction
Lots of businesses are likely to shrink (through clever planning) in size to a turnover of less than Rs 20 lakh

GST investigation wing detects tax evasion of over Rs 2,000 crore in two months
The GST investigation wing has detected tax evasion of over Rs 2,000 crore in two months, and data analysis reveals that only 1 percent of over 1.11 crore registered businesses pay 80 percent of the taxes, a senior official said on Wednesday