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How to implement a custom tax solution?

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Our company is using a 3rd party service (called SOVOS) to calculate our sales tax via API. I have the API working in BC code, but I am having a hard time knowing where to override those tax values. My approach has been to update the "Amount Including VAT" field in the "Sales Line" record, but the page doesn't seem to update appropriately. Should I be trying to use a tax engine? I am new to BC development, so I'm not sure the best way to approach this problem is. Any advice or help would be appreciated.

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Dynamics 365 Business Central

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YUN ZHU 84,555 Super User 2025 Season 1 on at

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RE: How to implement a custom tax solution?

Hi, The logic of directly modifying the tax in code is very complex and differs between versions, such as the W1 version and the US version.

In fact, you can adjust taxes manually in Business Central, this is a standard feature.

More details: https://yzhums.com/2056/

If you still want to customize and update via API, I think you can refer to the logic below.

Hope this will help.

Thanks.

ZHU
Dallefeld 175 User Group Leader on at

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RE: How to implement a custom tax solution?

I would recommend getting with your partner for assistance in integrating your API. You need to update the sales order, then update again on posting to an invoice and don't forget return orders and credit memos.

What fields are you updating? Tax Area, Tax Group, Tax Liable and there is no percentage in the sales line table.

There are 3rd party services already integrated to BC.