This topic is well covered in other threads, so have a search, but the following probably covers most of it:
- 75% of the mortgage interest if you're PRTB compliant.
- Repairs and day to day expenditure such as getting a chimney cleaned.
- Insurance
- Mortgage protection
- Letting fees, management charges, service charges
- 12.5% wear and tear allowances. €20,000 sounds high to me. When I vacated the property I lived in, the appliances and furniture had cost me around €16,000. I attributed a value of €8,000 to them and claim €1,000 a year.
- Accountancy (so your accountant might really cost 48% of the headline number).