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Add a charge or cost to an invoice (sales add-on voucher)

A sales add-on voucher records an extra charge or cost that belongs to an invoice already issued, such as freight paid for the customer. It books the extra to a ledger of your choice without changing the invoice.

  • Accounting Invoices
  • 3 min read
  • Updated October 20, 2026

For Accountant

What it is

Sometimes a cost or a charge belongs to a sale only after the invoice has been issued: freight you paid, a commission, an extra fee. The sales add-on voucher (menu Add-on Vouchers; the page is Sales additional) records it against the invoice without changing the invoice itself.

The voucher uses an Additional sales adjustment. The ledger set on that adjustment is credited, and the ledger you choose on the voucher is debited. These two must be different ledgers.

Make one

  1. Open the invoice and choose Sales add-on voucher
    Who
    Accountant
    Where
    Sales Invoice > the invoice > Sales add-on voucher, or Sales additional > Add and Find sales invoice
    What changes
    Add sales add-on voucher opens with the invoice's customer, currency and lines.
  2. Choose what to add
    What changes
    On the product tab, add the adjustment for a product line. On the Bill tab, add an adjustment for the whole bill: choose the Adjustment, the Ledger to debit, the Sub-ledger and the amount.
    Needs
    At least one Additional sales adjustment set up (Set up VAT, discounts and other sales adjustments). Without one the screen says "Please set sales additional adjustment policy."
  3. Save
    What changes
    The voucher is saved with its own number from the add-on series.

Common questions

The screen says "Please set sales additional adjustment policy."

No sales adjustment of the Additional category exists yet. Make one on Sales adjustment (Set up VAT, discounts and other sales adjustments).

Can I add a voucher to a cancelled invoice?

No. The add-on voucher is switched off on a cancelled invoice's page (Cancel an invoice).

The customer must get a bill for the charge.

An add-on voucher does not change the invoice and is not sent to the IRD. To bill the customer for the charge, raise a new invoice for it (Editing a saved invoice: what can and cannot change).

Related guides

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