At times you might find that your Invoice value is incorrect and not equal to the sum of the Taxable value and the Tax amounts. This might also impact the values in your GST reports as shown in the image below:
In such cases, you just need to follow the below steps:
Edit that particular voucher, Re- define the quantity and rate for any item in the voucher and check if the values for Subtotal and Total are updated or not.
In case your issue still persists, kindly check the below points:
1. Edit the items used in that voucher
2. Check if you defined any value in the Additional Cess field as shown in image below.
3. Just clear Additional Cess field and Save.
Now check your Invoice again.
(When you define the Additional Cess, it will add the Cess amount in the Taxable value but will not reflect the same in the Voucher.)
Also, double check your items for Default Tax Account and GST Registration type for your customer/suppliers.