Financial, monetary, pecuniary, fiscal are comparable when meaning of or relating to the possession, the making, the borrowing and lending, or the expenditure of money.
Financial implies a relation to money matters in general, especially as conducted on a large scale.
Monetary implies a much more direct reference to money as such and therefore often connotes the coinage, distribution, and circulation of money.
Pecuniary suggests a reference to the practical uses of money; it is often employed in preference to financial when money matters that are personal or on a small scale are being considered.
Fiscal implies reference to the financial affairs of a state, a sovereign, a corporation, or an institution whose concerns with revenue and expenditures are managed by a treasurer or treasury department.