In Australia:
When Buying:
- purchase price
- loan application fees (may be refunded by lender depending your negotiations)
- loan mortgage insurance (if you borrow over 80% LVR)
- conveyancing fees (which includes all your title searches)
- building and pest inspection/s
- stamp duty
- insurance for the building and/or contents
- repair/rehabilitation cost
You can save on some of these if you learn to do them yourself (worthwhile doing if you plan to buy/sell many properties), including conveyancing and building/pest inspections.
When Selling
- Capital gains tax if you made a profit on the property
- loan discharge fees
- conveyancing fess
- real estate advertising fees
- real estate commissions if you sell the property
- auction fees if you decide to sell at auction
- repair/rehabilitation costs
Once again you may be able to save on some of these if you learn to do them yourself, including conveyancing and selling the property yourself instead of going through a real estate agent (note: these DIY options are available in Australia but I don't know if they are available elsewhere).