I find people are not always aware of what they can and can’t claim back as expenses in Spain, mainly as there is no easy to understand list explaining this to you. Try asking your accountant and even they might not give you exactly what you need to understand, so, I will try to explain as clearly as possible. The following is what you can claim for, in all times, as long as you have a receipt with your name on and the payment details, using a card/account in your name (adding your NIE/TIE to the receipt is even better, thus providing you with a VAT invoice, or factura simplificada as its known):
Lunch – inside Spain you can spend €26.67 (How did they get to that amount?) and outside Spain €48.08. For a work trip away, you have an allowance of €53.34 for food, and outside of Spain €91.35. This does not include accommodation, which seems to be not capped (I would be careful here obviously).
For freelancers who work from home, Spain’s tax authority specifies certain partial deductions, such as supply expenses (water, electricity, gas, telephone, internet). The deduction is 30% of the expenses in proportion to the square meters of area at home you use, so for example an office. Not many people are aware this also includes for any home you own, on the mortgage interest part of the payment. So, if the space you work from home is 15% of the surface area, you can deduct that proportion. However, you must register your home address as your centre of economic activity when registering as an autónomo. As an autónomo, if you also partially use a vehicle for business, 50% of expenditures on it are deductible for income tax and VAT.
Car hire/leasing is covered, and generally a better way to go than purchasing a car in many cases.
Other things included as deductibles are charity donations (a specific amount) and varied work expenses, so paper, mobile phones and the contract, printers and their costs, client entertaining, travel expenses outside of food/beverage and work events. Usually, a good accountant will send you anything they aren’t sure about before they declare your expenses, so you can confirm what they are and you can then see if they are covered.
The following are importantly NOT covered and cannot be claimed as an expense:
Purchasing of a car (even if solely for work)