Financial capacity of the husband

If you have filed the maintenance case seeking maintenance, then both the parties are required to file an affidavit decalaring their assets and liabilities.

If you are able to prove that the opposite party has suppressed any vital information about the income and you have documentary evidence to prove the same,then you can take appropriate action as per law in furtherance.

After detecting "false" information in the affidavit of income and expenditure submitted by opposite party your lawyer should proceed to move a case of "perjury"  as per law.