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Small and medium business | Business Central, N...
Suggested Answer

GST to calculate on MRP for Purchases

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Posted on by 6
Hi Everyone,
 
There is a scenario where our client wants to calculate the GST on the MRP.
 
For illustration, refer below: -  
 
1. Item A : Qty - 1, Direct Unit Cost - 90, Line Amount = 90. System is calculating GST on 90 by default.
    Item B : Qty - 1, Direct Unit Cost - 70, Line Amount = 70. System is calculating GST on 70 by default.
 
2. Our client wants to calculate GST on MRP. Item A. MRP - 100, Item B MRP - 80. So GST should calculate on 100 and 80 for respective items.   
 
3. But MRP should not be considered to arrive at the Net Amount, only Line Amount to be considered. In this case Net Amount is 90 + 70 = 160.  
 
4. Inventory should also capture Line Amount of the respective item and not the MRP amount. 
 
So MRP is used to calculate only the GST for each item in the purchase invoice. Rest it should not impact anywhere in the Purchase Order/ Purchase Invoice. How to handle this kind of scenario. 
 
Note: - We are using Indian Taxation.
I have the same question (0)
  • Suggested answer
    YUN ZHU Profile Picture
    98,574 Super User 2026 Season 1 on at
    I'm not entirely sure yet, as it seems this might require customization. 
    Hopefully, other experts can offer better advice.
     
    Thanks.
    ZHU
  • Suggested answer
    Assisted by AI
    OussamaSabbouh Profile Picture
    11,908 Super User 2026 Season 1 on at
    Hello,
    Standard Business Central (India localization) calculates GST based on the Line Amount, so calculating GST on MRP while keeping inventory and net amount based on the Line Amount isn’t supported out-of-the-box. To meet this requirement you need a small customization: store MRP on the Purchase Line and override the GST Base Amount during GST calculation so it uses MRP × Quantity instead of Line Amount, while leaving Line Amount unchanged for inventory valuation, vendor payable, and posting. This way GST is calculated on MRP (e.g., 100 and 80) but the net amount and inventory value remain 90 + 70 = 160.
     
    Regards,
    Oussama Sabbouh

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