Tax is not calculating correctly

Your company is not set as a VAT payer in your business settings

The tax rate on the item or invoice is set to 0% or is blank

The tax column is hidden in your template settings

The wrong tax rate is applied to an item

You recently changed your tax settings, but the change only applies to new documents - not existing ones

Go to Settings - VAT settings

Make sure "Apply tax on invoices" is turned on

Check that the correct tax rate is entered - Billdu allows up to 3 tax rates

Verify that your company type is set to "VAT payer" or "Invoices with VAT" under Settings - Business details

Note: Billdu pre-fills your tax rate and tax name based on your location when you sign up - if your location was incorrect at signup, the rate may be wrong

Edit the invoice and check each line item - the tax rate is set per item, not just per invoice

If an item was saved with 0% tax in your Products or Services list, it will always default to 0% when added to an invoice

To fix it permanently, go to Products or Services, edit the item, and update the tax rate there

To fix it on one invoice only, edit the item directly on the invoice and change the tax rate

Go to Settings - Template design and settings

Make sure the tax column is not hidden under Template options

If the tax column is disabled, tax is still calculated in the Total - it just won't show on each line item

Changing your VAT settings does not update invoices or items that were already saved - only new documents are affected

If you need to update the tax rate on saved products or services, you must edit them one by one or use the import feature to overwrite existing items with updated values

Changes to template settings apply instantly to all documents

If you need to apply a Construction Industry Scheme (CIS) deduction, you can add a negative tax rate in Settings - VAT settings

Enter a negative value (for example, -20) and Save

Select the negative tax from the dropdown when adding items to your invoice