Even as a pensioner, you can claim expenses related to your pension as income-related expenses in your tax return. If your income-related expenses total less than 102 Euro, it is not worth entering them. The tax office automatically applies an income-related expenses allowance of 102 Euro, which is immediately deducted from your income. This allowance is applied jointly for all pensions and all income that must be declared under other income. It is an annual amount that is not reduced, even if the conditions did not apply for the entire year or if there was no income for the whole year. The income-related expenses allowance is personal and is available to each spouse separately as soon as they have the relevant income.
If you are unsure whether the tax office will recognise a particular expense, simply declare it and enclose the evidence. The tax officer will decide.