self-certification
noun [ U ]
LAW, FINANCE UK uk/ˌselfˌsɜːtɪfɪˈkeɪʃən/ us/-ˌsɝːṱɪ-/an official statement that you make about your financial situation, your health, etc.:
Self-certification enables borrowers to raise cash on their real earnings rather than sums shown by their accountants.
a self-certification loan/mortgage