The balances which are carried forward to next accounting period are taken/shown in Balance sheet. The accounting period may be a month or a quarter or even a year.
Then to prepare B/s you can consider closing balances of Assets at the end of every period(month)after considering depreciation alternatively you consider the original cost of assets on assets side and create provision for depreciation and show in liabilities side .
The accounting entry will be:
Depreciation a/c Dr......{charged to p&l}
To Provision for Dep. a/c{Accumulated Balance shown in B/S.}