Yes and that is why you can only see this difference by putting an end date for each of these months as the start date is the start date of the company. As was explained it does not make sense on balance sheets to enter interval dates as for P&L because it would no longer “balance” the accounting equation (equity = assets - liabilities). BS is about what you own and what you owe at any particular date. It would for example not make sense to compare data from January 1 to January 31, 2021, with data from February 1 to February 28, 2021, because you may have bought assets in May 2019 that you still use, and/or took loans in December 2020 that you still owe. So do as advised by: