Thanks for the answers, guys!

Hi! Is there a way I can know (e.g. via an API call) which coin I have to buy with the money I have right now in my wallet if I want to get the maximum profit out of the transaction?

Example: I have BTC 0.01. Which indicator do I have to check beforehand (e.g. exchange rate from BTC to the rest of cryptos, volume in 24h for the rest of cryptos, etc.) to find which coin I have to buy (ETH, LTC, BCH...) with my bitcoins to get some "additional value" out of the transaction?

I'm looking for a kind of "biggest positive profit indicator" for a specific pair, to benefit in the short term just because of the transaction itself (benefit from jumping from currency to currency, rather than from holding and buying/selling the correct crypto at the right moment), if it exists.

Thanks a lot!

Thanks a lot for your help Don Pedro Dinero! As I see, it's a tricky question... I've just asked in the Dutch section about it (thanks for the advise!), now that I know that investing using a Spanish account doesn't have anything to do with where you do your annual tax.

Thanks a lot again!

Hi! I'm new in The Netherlands (I came from Spain to work in 2017) and I bought my first small amounts of ETH using my Spanish bank account through Coinbase/Gdax, and then I've been exchanging my cryptocurrencies in Binance. During this year (2018), I'll have to make my annual tax here in The Netherlands.

My questions are:
1. Do I have to pay taxes related to my investments in the Dutch annual tax if I earn or lose money due to my activity? (I guess yes). I will have to just justify the overall gain or loss?
2. What if I don't exchange any of my cryptocurrencies to EUR, but I exchange ones for others (like selling bitcoin to buy Ethereum)? Do I still have to pay for it or only when I withdraw the money as EUR in my personal bank account? I ask this because in Spain some people say you're supposed to do that.

Thanks a lot!

Thanks a lot for the info, Don Pedro Dinero! That makes me feel a bit more comfortable... However, for point 4, all my uncertainty comes from this post (and the videos shown there):
http://www.bolsamania.com/declaracion-impuestos-renta/como-tributan-los-bitcoins-en-la-renta/

They say if you trade (buy/sell) with different cryptocurrencies, you should declare it. But on the other side, a lot of people is telling me this is not true. Don't know what to think.

And a last question: if you move your cryptocurrencies back to a EUR wallet in Coinbase (e.g.), that is not considered as stored in your bank account, so in that case you consider that you still don't have to take that money into account for the annual tax? It's in EUR, but it's not in your bank account.

Thanks a lot!

Hi! I'm a Spanish guy who moved to The Netherlands in 2016 to live and work, and I get paid my salary in my Dutch bank account. By the end of 2017 (actually the last day of December... so stupid) I bought my first small amounts of ETH using my Spanish bank account through Coinbase/Gdax, and then I've been exchanging my cryptocurrencies in Binance. During this year (2018), I'll have to make my annual tax here in The Netherlands for sure.

My questions are:
1. Do I have to pay taxes related to my investments in the Dutch annual tax if I earn or lose money due to my activity? (I guess yes). I will have to just justify the overall gain or loss?
2. Do I have to declare the same in the Spanish annual tax as well (or only here) because I'm using a Spanish bank account? Otherwise, I was not planning to make any annual tax in Spain...
3. What if now I add my Dutch account as a new new bank account to my Binance exchanger and keep working with my Dutch bank account and nothing else to do with the Spanish one (I could maybe delete it)?
4. What if I don't exchange any of my cryptocurrencies to EUR? Do I still have to pay for it?

I just want to avoid as many trauma as possible with all the annual taxes. I have to say that I've investing very low amounts for now, but if I'm screwed anyway, I plan to keep going on.

Thanks a lot!