Hi @sherin p,
Though budget is allocated at the campaign level, not the account.
If your AdWords account contains more than 1 campaign then you need to put separate budget for all or if you want to share the single budget for all the campaigns then you can use Shared budget from the Shared library.
I hope you are asking for the balance in the AdWords account which is reflecting 1800 INR instead of 2000 INR.
I would recommend to access the Billing & Payments tab(from settings cog), to check the charges incurred.
This might be the tax(GST) deduction.
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