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UK Ltd taxation on stocks/bonds income and real estate rent income
For stocks, bonds, ETF funds and so on - Taxed only on realised gain and losses are deductible from the gain and not from company's income. Corporate tax is calculated only after all expenses have been deducted. Not the other way around. Real estate expenses can be deducted because of repairs and maintenance.  In general all expenses related to the operation of the business can be deducted. But you cannot use expenses as willy nilly, as you assume. You cannot deduct your subscription to Playboy as an expense. Doing it is illegal and if caught, the tours to church will increase exponentially. VAT is only paid if you claim VAT on your invoices. Your situation seems quite complicated. I would suggest, get an accountant pronto. There are nuances in your situation, which an accountant only can understand and help.