Depreciation in the accounts would be at whatever rates are appropriate for the assets and the business. e.g. you may consider 20% over 5 years to be appropriate.
That depreciation is a cost in the accounts.
For tax purposes depreciation is not allowed as a deduction. Instead Capital ALlowances are granted on allowable assets at 12.5% pa for 8 years. You therefore get a deduction against your income of that amount. Assuming that the full €70K qualifies for normal Capital Allowances then you get a deduction against your income of €8,750pa for 8 years. It is a deduction not an absolute tax amount, it reduces your taxable income by €8,750pa.
Your accountant or whoever is doing up the books for you can explain this more if you are unsure.