From bank every month getting a gst input credit...But in gst report it is not showing why?

Thank you for posting here in the Community, @reeja. It could be that your GST isn't set up in QuickBooks that's why it's not showing in the GST report. 

To set up your QuickBooks GST, you'll need to get GST registered first, then add your GSTIN details. Here's how: 

GST for QuickBooks companies that have set up tax agencies

1. Existing companies that have set up tax agencies will see the “GST ready” widget on the dashboard page.
2. Enter your GSTIN (Not having GSTIN won’t stop you from creating invoices using GST tax rates in QuickBooks) and click Save.

GST for QuickBooks companies without taxes setup

Companies (existing and new) that have not enabled tax will see a Setup GST widget on the dashboard page. Here's how: 

1. Click Setup GST, then click Edit GST settings.
2. Enter Start of the tax period, which would be July 1st, 2017.
3. Enter your GSTIN.
4. Choose your Filing frequency and Accounting method.
5. Click Save.

Once done, follow Step 3: Add your HSN, SAC codes outlined in this help article: Setting up QuickBooks for GST.

For additional information, you can click this article: The GSTR3B (GSTR 3B) report in QuickBooks.

For future reference, check out this article to see information on how QuickBooks pulls in your transactions into the GSTR4 report: The GSTR4 report in QuickBooks.

Please know that you are always welcome to post in the Community if you have any other concerns. Wishing you and your business continued success.