steuerlich
tax-related
Relating to taxes; concerning taxes.
Bestimmte Ausgaben für das Arbeitszimmer kann man steuerlich geltend machen.
Certain expenses for a home office can be claimed for tax purposes.

tax-related
Loading your saved state.
tax-related
Relating to taxes; concerning taxes.
Bestimmte Ausgaben für das Arbeitszimmer kann man steuerlich geltend machen.
Certain expenses for a home office can be claimed for tax purposes.

The adjective 'steuerlich' (tax-related) is derived from the noun 'die Steuer' (tax). The ending '-lich' is often used to form an adjective from a noun that means 'in relation to ...'.
Die Regierung plant eine steuerliche Entlastung für Familien.
The government is planning tax relief for families.
This adjective almost always appears in fixed expressions. The most important ones are 'etwas steuerlich absetzen' (to deduct something for tax purposes) or 'etwas steuerlich geltend machen' (to claim something for tax purposes), which means deducting costs from taxes.
Die Kosten für die Fahrt zur Arbeit kann man steuerlich absetzen.
The costs of commuting to work can be deducted for tax purposes.
'Steuerlich' (tax-related) is a technical term from finance and law. It is used when talking about tax returns, finances, or laws. You hear it less often in normal everyday conversation.
Wir brauchen eine Beratung zu den steuerlichen Vorteilen dieser Investition.
We need advice on the tax advantages of this investment.
financial
'finanziell' and 'steuerlich' both have to do with money, but they do not mean the same thing. 'finanziell' is used generally when talking about money, costs, income, or someone's economic situation. 'steuerlich' only fits when something is directly about taxes, for example in a tax return or rules from the tax office. The words can be confused because taxes are also part of finances. A simple guide is: everything tax-related is financially important, but not everything financial is tax-related.

Vor dem Termin lässt sich Anna steuerlich beraten.
Before the appointment, Anna gets tax advice.
Nach dem Umzug ist die Familie finanziell ziemlich belastet.
After the move, the family is under quite a lot of financial strain.