finanziell
financial
Relates to money, finances, or the economic situation of a person, company, or state.
Wegen der Krise hat das Unternehmen große finanzielle Probleme.
Because of the crisis, the company has major financial problems.

financial
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financial
Relates to money, finances, or the economic situation of a person, company, or state.
Wegen der Krise hat das Unternehmen große finanzielle Probleme.
Because of the crisis, the company has major financial problems.

The adjective 'finanziell' (financial) derives directly from the noun 'die Finanzen' (finances, plural). It describes everything that has to do with money.
Die Finanzen des Vereins sind stabil.
The club's finances are stable.
'Finanziell' (financially) is often used as an adverb at the beginning of a sentence to limit the scope of a statement to the aspect of money. The verb follows after it.
Finanziell können wir uns dieses Jahr keinen großen Urlaub leisten.
Financially, we can't afford a big vacation this year.
Common nouns combined with 'finanziell' (financial) are 'finanzielle Unterstützung' (financial support), 'finanzielle Mittel' (financial resources), 'finanzielle Lage' (financial situation), or 'finanzielle Schwierigkeiten' (financial difficulties).
Viele Studenten sind auf finanzielle Unterstützung ihrer Eltern angewiesen.
Many students depend on financial support from their parents.
economic / economical
'wirtschaftlich' and 'finanziell' both have to do with money and the economy. 'finanziell' is especially appropriate when something is directly about money, costs, income, or the financial situation of people, companies, or countries. 'wirtschaftlich' is broader: it can refer to the economy in general, but it can also mean that something is economical, profitable, or sensible in terms of costs. Learners can easily confuse the words because both occur in money-related contexts. As a simple guideline: if it is only about money, 'finanziell' is often more precise. If it is about the economy in a broader sense or about efficient action, 'wirtschaftlich' fits better.

Nach der langen Krankheit braucht die Familie finanzielle Unterstützung.
After the long illness, the family needs financial support.
Für die Firma ist der neue Lieferweg wirtschaftlich, weil er Zeit und Kosten spart.
For the company, the new delivery route is economical because it saves time and costs.