Dua for settling a debt
اللّهُـمَّ اكْفِـني بِحَلالِـكَ عَنْ حَـرامِـك، وَأَغْنِـني...
اللّهُـمَّ اكْفِـني بِحَلالِـكَ عَنْ حَـرامِـك، وَأَغْنِـني بِفَضْـلِكَ عَمَّـنْ سِـواك
Allahummak-finee bihalalika AAan haramik, wa-aghninee bifadlika AAamman siwak
Translation
O Allah, make what is lawful enough for me, as opposed to what is unlawful, and spare me by Your grace, of need of others.
When to recite
Recited when in debt, seeking relief.
Source / Reference
At-Tirmithi 5/560