Short answer
Important financial expectations should be discussed honestly before Nikah so that both sides understand their responsibilities and lifestyle expectations.
Islamic Guidance
What Islam teaches
Islam encourages honesty and fulfilment of agreements. Financial responsibilities should not be hidden or deliberately misrepresented.
Practical Guidance
What you can consider
Discuss income, major financial responsibilities, housing, debt, employment plans, support for parents and expected lifestyle in a respectful manner before marriage.
Sources
Qur'an 4:29; Qur'an 5:1; Sahih Muslim.