i would like to know if depreciation is calculated for monthly income statement.
if you can provide me a format that would be great

Yes Depreciation expense should be calculated monthly and included in the monthly income statement.

Attached is a format for a simple income statement i hope it will help you.

Also called EBIT (Earnings before interest and Taxes) operating income is income before these charges.

Operating income also does not include: income (loss) from discontinued operations, extraordinary items (for example gain or loss on disposal of equipment), cumulative effect of accounting change, gain or loss on investments, and any other non-recurring charges.

Earnings before interest and taxes - Wikipedia, the free encyclopedia (http://en.wikipedia.org/wiki/Earnings_before_interest_and_taxes)

operating income Definition (http://www.investorwords.com/3460/operating_income.html)

Operating Income (http://www.investopedia.com/terms/o/operatingincome.asp)

For depreciation there are many ways to calculate it.

You need to determine your company's depreciation method first before you can calculate the deprecaion. Also you will need to know the cost of the depreciable asset, the salvage value and the useful service life of the asset.