Is it permissible to add an extra amount to the invoice submitted to the state, to compensate for amounts already paid and amounts overdue, especially given the urgent need?

Allah Almighty says: ﴿So ask the people of the message if you do not know.﴾ [Al-Anbiya: 7]. The fundamental principle is that Muslims are bound by their conditions, and fulfilling contracts is obligatory as Allah Almighty says: ﴿O you who have believed, fulfill [all] contracts.﴾ [Al-Ma'idah: 1]. Therefore, it is not permissible to increase or manipulate prices in violation of the concluded contract. Please clarify your question and its details to enable a comprehensive answer.