Despite passing of almost 3 years since the enactment of GST laws, many mistakes are still being committed by GST tax payers  while filing GST returns particularly GSTR3B and GSTR1. These mistakes are generally committed either due to negligence, oversight or due to lack of conceptual clarity on various provisions of the GST Acts and Rules. The problems arise as there is no edit facility in these GST Returns. Although many such mistakes can be corrected in subsequent returns or  in the Annual Return but the implications of such mistakes can be huge in terms of determination of tax, interest ,late fee and penalty. Here based on the experience of the author, 22 most common mistakes are enumerated.

1) Questions to show relevant tables in GSTR 3B not properly answered  

At the time of filing GSTR-3B, certain questions(A to G) have to be answered based on which relevant applicable Tables show up in GSTR-3B. If any question is answered in the negative, the relevant table will not show up in 3B. Therefore, ieven if any data is to be fed in such table, the same would  be missed to be uploaded. Most common instances of such omissions are  for question C(Table 3.2 Inter-state supplies)  and question E (Table 5.Exempt,nil and Non GST inward supplies )which do not affect the output tax/input credit.

2) Mistake in selecting return frequency option(monthly or quarterly)  by normal tax payer

At the time of filing of  the first Return in any financial year, the taxpayer has to choose option for filing Quarterly/Monthly filing  of GSTR-1 . To choose such options, the taxpayer has to answer the  following questions:

Whether your aggregate turnover during the Previous financial Year was upto Rs. 1.5 Crores or

Do you expect your aggregate turnover  during the Current Financial Year to be upto Rs. 1.5 Crores



The wordings of these questions often confuse the tax payer and the taxpayer sometime ends up giving  wrong answers leading him/her in selection of wrong filing option. This, however is editable but only once and hence utmost care should be taken while answering the questions for selecting  the option because option once is exercised cannot be changed during the entire  Financial Year.

3)  Mentioning Wrong GSTN of recipient  in GSTR-1

This  is the most common mistake done in GSTR-1. At the time of feeding data in GSTR-1, the GSTIN of recipients is wrongly mentioned. This results in  invoice details not being reflected in 2A of the recipient and consequential denial of input credit to the recipient. If the accounts are maintained in some software like tally etc. it is   important that GSTIN of recipients  are correctly fed at the time of creating the accounts. Such mistakes can be amended in subsequent months in GSTR1 subject to the provisions of  Section 16(4) of the CGST Act.

4)  Mentioning wrong invoice details in GSTR1

Just like GSTN , the other invoice details like invoice number, invoice date are also sometimes wrongly feeded  . In some cases it has been observed that the  invoice value as mentioned in the invoice wise details in GSTR1 do not match with the total of taxable value and the tax charged in such invoice. It is also a common mistake that while providing rate wise details of an invoice, details of one or more rates are altogether omitted whereas the total invoice value is correctly feeded. This ultimately creates mismatch  between GSTR3B and GSTR1.

5)  Showing Outward Supply details in Inward Supply Table & Vice Versa

While this may look bizarre, but its a personal experience that accountants / assistants sometimes feed data of outward supply in Table meant for Inward Supply & data of Inward Supply in Table meant for outward supplies . If the tax effect is not much significant this may not come to notice  for months & can be detected only at the time of preparing Annual Returns or when matched with the books of accounts .If corrective action not taken either by correction in subsequent months or in the Annual return, it may invite notices from the Department  under Sec. 73 or Sec. 74 of the CGST Act.

6)  Entering B2B Supply in B2C Supply

Sometimes B2B supplies are shown under B2C supplies. As a result the recipient cannot avail the ITC credit as it is not reflected in his GSTR-2A. This mistake is generally  committed when GSTIN of the supplier may not be readily available at the  time of uploading GSTR-1. It may also be due to the GSTIN of the supplier not taken or recorded in the Invoice or not updated in the accounts. This mistake, however, can be rectified in subsequent months by way of amendment.

7)  Showing supplies to Tax Deductors as B2B supplies

In case of Tax Deductors, GSTIN is generally TAN based and  supplies to them is a  B2C transaction unless the Tax Deductor has taken normal registration. It is a common mistake to show supplies to such Tax Deductors as B2B supplies in the GSTR 1. Such mistakes also can be corrected by in GSTR1 of subsequent months by way of amendment.

8)  Uploading same figures in two different months

Sometimes when returns of two or more than two months are prepared simultaneously, it has been observed that same data feeded in one month is also feeded in subsequent month or another month .This is due to sheer negligence and results in wrong reporting and non reporting of actual data.

9)  Not filling correct data in GSTR-1 for B2C transaction

It has been observed that mistakes are after committed in filling GSTR-1 for B2C details. For B2C, consolidated rate wise details are to be given. If there are transaction of 2 or more rates it has been seen that due to clerical mistake or due to oversight, details of one or more rates are left out . This will result in mismatch with 3B and can be rectified in subsequent months.

10) Nil rated supply  shown under non GST supply or vice versa

Sometimes due to lack of conceptual understanding or due to inadvertence, exempt & nil rated supply is shown as non GST supply and vice versa under table 5(Value of exempt, nil-rated and non-GST inward supplies) of GSTR 3B. As it does not affect the tax  liability, it may not come to notice till  the time of filling of the Annual  Return.

In (GSTR1(Table 8A,8B,8C,8D-Nil Rated supplies) further segregation is to be made between nil rated supplies, exempt supplies and non-GST supplies. Hence, a clear understanding of what supplies would constitute nil rated ,exempt and non –GST supplies is a must to provide correct data in the GST returns. Segregation is further required to be made between intra –state and inter-supplies to registered persons and intra-state and inter –state supplies to unregistered persons against such supplies. Here also, mistakes are committed in reporting figures under wrong heads.

11) Showing ITC available under wrong heads

ITC available on Import of Goods is to be shown under Table 4(A) (1) and ITC on Import of services is to be shown under Table 4 (A) (2) and normal ITC available on goods/services/capital goods is to be shown under Table 4 (A) (5) as all other ITC. However, it is sometimes seen that  ITC on  import of Goods, and/or Services is  clubbed with normal ITC i.e. all other ITC under Table 4(a)(5).

12) Reversal of ITC

Reversal of ITC as per rule 42 & 43 of CGST / SGST Rules to be shown under Table 4 (B) (1) while ITC reversal  due to other reasons is shown under Table 4(B)(2). However, due to lack of conceptual clarity, sometimes ITC reversal is shown under Table 4(B)(2) without  any distinction being made in reversal of ITC under Rule 42/43 and for other reasons.

13) Documents Table in GSTR1

It is generally seen that not much attention is paid to fill Table 13 ( Documents Issued) of GSTR 1. Either this Table is left blank or only the details of invoices for outward supply are given in point 1 of this table. It is pertinent to note that details of other invoices issued are also need to be specified, if applicable, e.g. invoices from inward supply from unregistered person(may  be self raised invoices),revised invoice, debit note, credit note, receipt voucher(in case advances are received), payment  voucher, refund voucher, delivery challan for job work, delivery challan for supply on approval, delivery challan in case of liquid gas and delivery challan in cases other than by way of supply.

14)  Set off of Output Liability by wrong adjustment of ITC

The correct mechanism  to utilize input tax credit to set off output tax liability through Electronic Credit ledger  is that first IGST Input should be exhausted and this can be done by setting it off with  IGST, CGST & SGST liability . Then CGST input can be utilized to set off  CGST liability and IGST liability and similarly, the SGST input can be utilized to set off  SGST liability and IGST liability.

If IGST input is utilized to set off CGST & SGST liability, care should be taken to utilise it equally between CGST & SGST liability . While as per law, this can be done in any proportion between CGST and SGST liability, it is always better to set off equally so that the ultimate CGST and SGST tax payable is equal and in case of excess input, the ratio of SGST and CGST credit ledger balane is also equal. Commonly the portal tends to set off the CGST liability first if any balance of IGST remains after setting of IGST liability. This leaves less ITC utilization for SGST resulting in payment of more SGST as compared to CGST though the total liability is not affected.

15) Non submission of Final Return

A s  per section 45 of the CGST Act, every registered person who is required to furnish a return under sub-section (1) of  Section 39 and whose registration has been cancelled has to furnish a final return (GSTR-10)within three months of the date of cancellation or date of order of cancellation, whichever is later.But it is generally observed that such persons fail to submit the Final Return in Form GSTR 10 either due to ignorance or due to inadvertence. Such non filing entails late fee which  can be easily avoided if the return is furnished within the due date. In most cases it will be a NIL return but due to laxity the taxpayer ends up paying the late fee which can raise upto Rs. 10,000/-

16) Export sale wrongly shown as normal sale

It is also observed that sometimes export sale is shown as normal sale in 3B and information of export in Table 6A of GSTR-1 is not correctly filled. In such cases, IGST refund would not be processed if it fails any validation  at the level of either GSTN or Customs system.

17) Non availing of ITC credit on bank charges

In many cases taxpayers do not avail ITC on bank charges levied by banks on the premise that banks do not issue invoices for the same. In such cases, tax papers can claim the input on bank charges on the basis of bank statements issued by the bank. Such ITC  is also reflected in 2A of the recipient.

18) IGST sales shown as CGST and SGST Sale

Its very common that sometimes Interstate sale(IGST sale)is shown as Intra state sale (CGST and SGST sale)in GSTR 3B. In such  case, taxpayer should declare amount of such IGST sale  in subsequent month. Similarly,  the amount of intra state sale should be  reduced from intra state sale of subsequent month/s.

19) Liability of Trusts/Societies

In many cases charitable  Trusts/Societies have  income from sources like rent from shops/godowns/marriage halls etc. Such activities are not exempt from GST and hence, the Trusts/Societies are liable to GST registration if the turnover crosses Rs. 20 lakhs. But it has been observed that in some cases  registration is not taken . This should  be taken care of to avoid levy of tax, interest and penalty in future.

20) Taking excess Input claim than actual in GSTR-3B

Sometimes by mistake input claim is excess taken in a month than actual input. In such cases taxpayer needs to reverse excess claimed ITC of previous month in Table 4(B)(2).

21) Showing gross turnover of outward supplies instead of taxable turnover

It is a common mistake that while showing details of outward supplies in 3B, instead of taxable turnover, the amount of gross turnover is mentioned. This excess amount either needs to be reduced from the figure of taxable turnover in subsequent months or adjusted at the time of preparation of Annual Return.

22.Taking short Input claim than actual in GSTR 3B

Sometimes input claim is not availed either due to non availability of purchases invoices at the time of filing of the 3B return or by mistake and the taxpayer ends up paying the liability in cash. Such input tax credit,however, can be availed in subsequent months.

 However, as per provisions of section 16(4) A registered person shall not be entitled to take input tax credit in respect of any invoice or debit note for supply of goods or services or both after the due date of furnishing of the return under section 39 for the month of September following the end of financial year to which such invoice or invoice relating to such debit note pertains or furnishing of the relevant annual return, whichever is earlier.So care should be taken to claim the left out ITC during such period.

A  pertinent case on this point is Bharati Airtel Ltd.Vs. Union of India & Otrs(Delhi High Court) in which case the petitioner claimed less ITC during a particular period due to which its outward liability was increased and the petitioner was compelled to discharge its tax liability in cash .although actually,ITC was available with it but was not reflected in the system on account of lack of data. The Delhi High Court allowed the petition and permitted the petitioner to rectify form GSTR-3B for the period to which the error relates.

The above common  mistakes are examples of mistakes that the tax payers/consultants come across while filing the GSTR returns in 3B and GSTR1. These mistakes mainly arise either because of negligence of assistants/accountants and/or due to inadvertence or due to lack of proper understanding of GST provisions.  Therefore, it is imperative that those entrusted with the task of preparing GST returns should be given adequate training on a continuous basis. There should be proper reconciliation of GSTR 3B with GSTR 1,GSTR 3B with 2A as well as  GSTR 3B and GSTR1 with the books of accounts before the finalization of Annual Return and all corrective measures taken at the earliest point of time.

Author Bio

Qualification: CA in Practice
Company: Pravin Jain & Associates
Location: DIBRUGARH, Assam, IN
Member Since: 04 Jun 2020 | Total Posts: 2
Immediate past chairman of Dibrugarh Branch of EIRC of ICAI View Full Profile

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  1. CA Rajesh aggarwal says:

    export sales with payment of IGST are mentioned as local sales in 3B but in GSTR1 it is correctly filed .How to correct this error?there is no domestic sales , not getting GST refund due to this, kindly suggest

  2. CA Rajesh aggarwal says:

    export sales with payment of IGST are mentioned as local sales in 3B but in GSTR1 it is correctly filed .How to correct this error?there is no domestic sales , not getting GST refund due to this, kindly suggest

  3. Scientek Services says:

    Dear Sir,
    Can you just send me sales tax rules or guidelines for not availing some inputs for GSTR3B.
    Like Freight charges, CAR & Bike etc..
    Is there any circular that what to take OR what not to take as input while filing (except purchase bills) GSTR3B?

  4. Kitesh Panchal says:

    Dear Sir, WE have filled GSTR3B export service with payment of Tax and by mistake figures add in 3.1 (a) outward taxdable supplies (other than zero rated, Nil rated and exampted) instead of (b) outwards taxable supplier (zero rated). Now, we have to apply for refund. *(please note we have filled GSTR 3B upto Aug-20 (without payment of Tax) last year 19-20 we had used option with payment of tax. (dealer : export of service (online)) Please advice how to apply for refund.

  5. A S Kataria says:

    Nice article sir, just needed a clarification regarding Table 5 In GSTR3B … mine is not a trading firm but a services firm … my main spend heads are .. salary, electricity charges, laundry expenses, etc …. do these expenses need to be shown in Table 5 of GSTR3B…, would be grateful if can clarify and also throw some more light on the inclusions in this Table ( May help others including traders ) …. appreciate your early reply… Thanks in advance 🙏🏻

  6. shine says:

    Point 17.Not taking ITC on bank charges-yOUR ARGUMENT IS NOT CORRECT. Many banks debiting bank charges but it doesn’t reflect in GSTR2A. Then how can it be taken as ITC.

    1. CA Pravin Kumar Jain says:

      Under GST, every expense made during the course of futherance of business is allowed to claim as input tax credit. ITC on Bank charges can be claimed as it is not restricted under section 17(5) of CGST Act. Bank statement can be treated as authenticated invoice.For reflection in 2A please follow up with the concerned bank.

  7. chitra.k says:

    While filing 3B export sales is mentioned as local sales .It is a totally export oriented unit .No domestic sales .How to correct the mistake?


    Sir,thanks for article on mistakes which is very useful for us. and what can do if the mistakes on submission of 3B during July 2017 to march 2019 in which tax amount paid actual every month but wrongly set toff , can we we get relief of interest demand by the government for that period , please send your opinion.


    The mistakes what u have explained are very true, how could we take training on hand. Most of the time we don’t get invoice in time, or itc which we have paid.

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