No, you do not need to redo your rental activity. If you have done all the proration of expenses yourself and you use the square feet of space rented divided by the total square feet you should be good to go. Sometimes, depending on what you enter it can be confusing and this way you know exactly what you have expensed. Keep your records together.
You can also enter the business percentage of the cost of your home for depreciation. If you calculate the business use percentage do not put in any percentage values for business use because your figures would represent 100% of the rented space. it is not necessary for you to enter the land value but you must remove that from the cost basis to arrive at the business use percentage of the building. You could use the tax assessment records to arrive at the portion of the purchase price attributable to land.
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