For year end, there a few items you should review to make sure you are not missing expenses on your books or need to pay additional expenses for the tax deduction.
1. Review your taxes paid for the year for payroll, property tax, etc to make sure you have paid them. If you have not you either have to pay them by the 31st or will have to take the deduction in the next year. You can generally pay most taxes online.
2. Verify that you have booked all interest expenses on any loans you have for the business and the loan balances are reflected correctly on your balance sheet.
3. Review any fixed assets you have purchased during the year and check if they are fully depreciable, such as furniture and equipment. You may want to go ahead and expense the depreciation on the books to see where you stand. If the asset is not fully depreciable, for example personal laptop computers, then you can estimate how much of it you can depreciate, for example 75%.
4. If your taxable income is higher than what you would like to pay income tax on, check if there are any outstanding expenses you can pay by the 31st of December.