--- title: "About VAT amount validation in documents" description: "Visma Net provides you with the functionality of validating the VAT amounts in supplier documents that you enter into the system." lang: en languages: en: https://docs.vismasoftware.no/visma-net-erp/help/vat/manage-taxable-documents/about-vat-amount-validation-in-documents/index.md lastmod: 2026-02-19 --- > Documentation index: https://docs.vismasoftware.no/visma-net-erp/help/vat/manage-taxable-documents/llms.txt # About VAT amount validation in documents Last modified February 19, 2026 > Visma Net provides you with the functionality of validating the VAT amounts in supplier documents that you enter into the system. Visma Net provides you with the functionality of validating the VAT amounts in supplier documents that you enter into the system. To make the system to validate the VAT amount in a document, you need to enter the control VAT amount in the **'VAT amount** field while adding a document on a document entry window. > [!NOTE] > The system validates the VAT amount that you have specified in a document only if the **Net/gross entry mode** functionality is enabled in the [Enable/disable functionalities (CS100000)](https://docs.vismasoftware.no/visma-net-erp/help/common-settings/enable-or-disable-functionalites/enable-disable-functionalities-cs100000/index.md) window. To make the **VAT amount** field available in the top part of the document entry window, you need to select the **Validate VAT totals on entry** check box in the preferences window of the corresponding workspace: + The [Supplier ledger preferences (AP101000)](https://docs.vismasoftware.no/visma-net-erp/help/supplier-ledger/supplier-ledger-windows/supplier-ledger-preferences-ap101000/index.md) window: To make the VAT amount validation field available in the [Purchase invoices (AP301000)](https://docs.vismasoftware.no/visma-net-erp/help/supplier-ledger/supplier-ledger-windows/purchase-invoices-ap301000/index.md) window. + The [Cash management preferences (CA101000)](https://docs.vismasoftware.no/visma-net-erp/help/cash-management/cash-management-windows/cash-management-preferences-ca101000/index.md) window: To make the VAT amount validation field available in the [Transactions (CA304000)](https://docs.vismasoftware.no/visma-net-erp/help/cash-management/cash-management-windows/transactions-ca304000/index.md) window. With this check box selected, after you have added all the required detail lines in a document, the system will compute the VAT amount according to the tax settings applicable to a document and validate this amount against the VAT amount specified in the validation field. If there is a discrepancy between the VAT amount that you have entered in the **VAT amount** field and the VAT amount computed by the system (that is shown in the **VAT amount column** on the **VAT details** tab), the system does not allow you to process the document until you correct the VAT amount. In that case, you correct the VAT amount manually on the **VAT details** tab. ## VAT amount discrepancies Some discrepancies can appear between the VAT amount computed by the system on the document entry window and the VAT amount specified in the original supplier document. These discrepancies may be caused due to rounding differences, for example, when the VAT amount of the original document was calculated in another system in which the rounding rules are set up differently. The discrepancies can be minor differences in decimals, but nevertheless they should be corrected. If any discrepancy arises and the system shows the corresponding error, you manually correct the VAT amount in the **VAT amount** column of the **VAT details** tab so that it matches the VAT amount of the supplier document. In that case, if the **Net** VAT calculation method has been applied, all the amounts in the document will be exactly the same as in the source document (after you correct the VAT amount manually) and the document will be balanced. If the **Gross** VAT calculation method has been applied, the taxable amounts used by the system for VAT amount calculation can differ slightly from the taxable amounts used for the original document. In that case, the discrepancy (the amount of the difference) that has occurred will be accounted and posted to the corresponding general ledger account. Thus, as a result, the document will contain exactly the same amounts as the source document, but the amount that has appeared due to rounding differences, will be accounted on the respective general ledger account: In that case, the general ledger transaction will look as shown in the following example: |Account|Debit|Credit| |---|---|---| |Supplier ledger account|Total amount|| |Expense account (Line 1)|Amount1|| |Expense account (Line 2)|Amount2|| |Tax payable account|VAT amount|| |Rounding gain/Loss account|Discrepancy amount (the difference due to the rounding amount)|| To account for the discrepancy amount, you need to specify the maximum amount of the difference that can appear due to rounding in the **Rounding limit** field in the [General ledger preferences (GL102000)](https://docs.vismasoftware.no/visma-net-erp/help/general-ledger/general-ledger-windows/general-ledger-preferences-gl102000/index.md)window. The system will validate this amount against the discrepancy amount, and if the discrepancy amount does not exceed the limit, the discrepancy amount will be posted to the general ledger accounts specified in the **Rounding gain account/subaccount** field or the **Rounding loss account/subaccount** field in the [General ledger preferences (GL102000)](https://docs.vismasoftware.no/visma-net-erp/help/general-ledger/general-ledger-windows/general-ledger-preferences-gl102000/index.md)window. ## VAT exclusive and VAT inclusive amounts in document detail lines Before entering amounts in the detail lines of a document that you enter into the system, you must consider the type of amounts specified in the original supplier document. Depending on the business requirements of the applicable supplier, a document can contain in its detail lines amounts that are either VAT inclusive (net) or VAT exclusive (gross). In Visma Net, you need to specify the VAT calculation mode that the system should use during the validation process. The selected mode defines how the system will compute the VAT and taxable amounts for the document. You select the required mode in the **VAT calculation mode** field (which can be found on several windows, as described below), in which the following options are available: Gross : Select this option if the amounts in the document detail lines include applicable taxes. Net : Select this option if the amounts in the document detail lines do not include taxes. Tax settings : Select this option if the standard tax settings should be applied to the document. This option is used if a tax with one of the following tax calculation methods selected in the **Calculate on** field in the [VAT (TX205000)](https://docs.vismasoftware.no/visma-net-erp/help/vat/vat-windows/vat-tx205000/index.md) window is applied to the document: **Calc. on item + VAT amount**, **Calc. on document amount**, and **Calc. on document + VAT amount**. > [!NOTE] > You can specify the **Gross** or **Net** VAT calculation mode only if item-level taxes are applicable to the document or those that have the **Calc. on item amount** option or the **Extract from item amount** option selected in the **Calculate on** field in the [VAT (TX205000)](https://docs.vismasoftware.no/visma-net-erp/help/vat/vat-windows/vat-tx205000/index.md) window. The **VAT calculation mode** field is specified on the following levels by using the appropriate windows: **Document**: You select the appropriate option on the **Financial details** tab of the document entry window. This option will be applied for computing tax and taxable amounts in this document. By default, the system fills in this field with the option specified for the supplier location (if applicable) or supplier that you specify for the document, but you can override the default option. **Supplier location** (if applicable): You select the appropriate option on the **General settings** tab of the [Supplier locations (AP303010)](https://docs.vismasoftware.no/visma-net-erp/help/supplier-ledger/supplier-ledger-windows/supplier-locations-ap303010/index.md) window. (By default, the system fills in this field with the option specified for the supplier, but you can override this option.) This setting will be applied by default to all documents in which you select this supplier location, but it can be changed for each document. **Supplier**: You select the appropriate option on the **Purchase settings** tab of the [Suppliers (AP303000)](https://docs.vismasoftware.no/visma-net-erp/help/supplier-ledger/supplier-ledger-windows/suppliers-ap303000/index.md) window. (By default, the system fills in this field with the option specified for the supplier class, but you can override this option.) This setting will be applied by default to all documents created for this supplier (if the option is not changed at the supplier location or document level). **Supplier class**: You select the appropriate option on the **General settings** tab of the [Supplier classes (AP201000)](https://docs.vismasoftware.no/visma-net-erp/help/supplier-ledger/supplier-ledger-windows/supplier-classes-ap201000/index.md) window. This setting will be applied by default to all documents created for the suppliers of this supplier class (if the option is not changed at the supplier, supplier location, or document level). > [!NOTE] > If the VAT zone of a supplier contains a withholding tax, the system automatically sets the VAT calculation mode to **Gross** and makes the **VAT calculation mode** field unavailable for editing. > [!NOTE] > If the VAT zone of a supplier contains a use tax, the system automatically sets the VAT calculation mode to **Net** in documents, and makes the **VAT calculation mode** field unavailable for editing. ## One-line document and multi-line document To speed the process of entering data on a document entry window, the system suggests a possible amount in each line that you add. For example: When you add the first line, the system automatically inserts in the **Ext. cost** column of the line the amount that you have entered in the amount validation field in the top part of the document entry window. > [!NOTE] > You can enable the amount validation functionality for the document by selecting the corresponding check box in the workspace preferences window (for example, the **Validate document totals on entry** in the [Supplier ledger preferences (AP101000)](https://docs.vismasoftware.no/visma-net-erp/help/supplier-ledger/supplier-ledger-windows/supplier-ledger-preferences-ap101000/index.md) window). This functionality allows the system to validate the amount that you enter in the amount validation field of the document entry window (for example, in the **Amount** field in the [Purchase invoices (AP301000)](https://docs.vismasoftware.no/visma-net-erp/help/supplier-ledger/supplier-ledger-windows/purchase-invoices-ap301000/index.md) window). The name of the check box that activates this functionality and the name of the validation field in the document entry window can differ depending on the document and the workspace. The suggested amount is exactly the same as the control amount you have entered (if the **Gross** VAT calculation mode is specified for a document), or this amount is recalculated according to the rate of the applied tax or taxes or the amount minus the applicable VAT amounts (if the **Net** VAT calculation mode is specified). You leave the **ext. cost** amount as it is if the document has only one line. If the document has multiple lines, you manually correct the first **ext. cost** amount in the document entry window based on the amount specified in the first line of your source document. When you add the second detail line, the system suggests the residual amount (the difference between the total document amount and the amount that you have specified in the first line) in the **Ext. cost** column of the second line; correct this amount if needed. The process proceeds similarly for any additional lines that you need to add. You can leave the suggested amount or correct it. > [!NOTE] > If you do not want the system to suggest residual amounts while you add the detail lines, do not fill in the amount validation field until you have added all required detail lines to the document. After you have added all required detail lines to the document entry window, the system compares the VAT amount (or amounts) computed on the **VAT details** tab to the control value you have entered in the **VAT amount****validation** field of the window. The document is balanced if the VAT amounts are the same; the system generates an error if there is any discrepancy. --- [View this page](https://docs.vismasoftware.no/visma-net-erp/help/vat/manage-taxable-documents/about-vat-amount-validation-in-documents/)