The following entries are suggested in financial books without contradicting service tax: 

1) When the invoice for providing services is raised to customer.

A)
Sundry Debtors A/c ---------------------------Dr
(By full amount of invoices)
To Service Receipts A/c (Revenue) ------------------------------------Cr
(By amount of charges for services)
To Service Tax deferred liability A/c -------------------------------------Cr
(By amount of Service Tax charged in the invoice)

2) When the payment is received from the customer.

A) 
Cash/Bank A/c ---------------------------Dr
To Sundry Debtors A/c. ------------------------------------Cr
(By amount of payment received)

B) 
Service Tax Deferred liability A/c ---------------------------Dr
To Service Tax payable A/c. ------------------------------------Cr
(By the amount of service tax component received from the customer. The total of all such credit in Service Tax Payable A/c during the period will be actual amount payable for the period)

3) When the goods are purchased for use as input in providing services.

A)
Material A/c ---------------------------Dr
(Net value of goods)
Cenvat Credit Available A/c ---------------------------Dr 
(By the amount of Cenvat credit available)
To Sundry Creditors A/c ------------------------------------Cr

(This is normal entry and no further entries are required since in case of goods Cenvat credit is available even if supplier’s bill is not paid)

4) When the input service is received

A) 
Service A/c (Primary head) ---------------------------Dr
(Net value of services)
Cenvat Credit Receivable A/c ---------------------------Dr
(By amount of service tax charged in the bill)
To Sundry Creditors A/c ------------------------------------Cr
(Full value of bill)

5) When the payment is made to the input service provider.

A) 
Sundry Creditors A/c ---------------------------Dr
To Cash/Bank A/c ------------------------------------Cr
(By amount paid)

B)
Cenvat Credit Available A/c ---------------------------Dr
To Cenvat Credit Receivable A/c ------------------------------------Cr
(To the extent of Service tax component in the amount paid to service provider)

6) When capital goods are purchased for providing services.

A)
Assets A/c ---------------------------Dr
(Net of Cenvat Credit)
Cenvat Credit Available A/c ---------------------------Dr
(50% of Cenvat Credit)
Cenvat Credit Receivable A/c ---------------------------Dr
(50% of Cenvat Credit)
To Sundry Creditors A/c ------------------------------------Cr 

7) Payment of service tax to government collected from the customer.

A)
Service Tax Payable A/c ---------------------------Dr
To Cenvat Credit Available A/c ------------------------------------Cr 
(Adjusted for input credit utilized for payment of output Cenvat)
To Bank/Cash A/c ------------------------------------Cr 
(Balance Paid)

Important Points to be remembered:

Cenvat Credit a/c:
In case of capital goods Cenvat Credit Rules provide that only 50% of credit will made available in the year of purchase and balance will be available in the subsequent years. In next year balance of 50% Cenvat credit be transferred to Cenvat Credit Available A/c.
In case any discount or adjustment is made in the invoice for rendering services necessary reverse entry be passed. Similarly if any discount or credit is received from sundry creditor necessary reverse entry need to be passed. With these entries the Cenvat Credit Available A/c will show the amount credit available to the service provider which can be used during the period for payment of service tax. Similarly the Service Tax Payable A/c will show the amount payable for the period. Necessary amount may be transferred from the Cenvat Credit Available A/c. to Service Tax Payable A/c. periodically based upon actual credit availed during the period. The actual amount of service tax paid be debited to Service Tax Payable A/c.

At the end of 31-Mar-20XX/Period reconciliation points:
(a) Service Tax Payable A/c should show a nil balance if there is no delay in monthly payments and if there is a delay then it will show credit balance which would be equal to service tax payable at the period end. 
(b) The Service Tax Deferred Liability A/c will represents liability of the service tax, which has not become due since the payment for rendering services is not received. 
(c) Cenvat Credit Available A/c will show a debit balance which is available for discharging the liability.
(d) The Cenvat Credit Receivable a/c will shows a debit balance which will be available in next period for availment subject to fulfillment of conditions i.e. (I) payment of consideration to the service provider or (II) balance of credit available for capital goods to be used in any of the subsequent period.