Quote from: sann111 on January 29, 2019, 02:47:14 AM

How to file tax if another user using coinbase, a family member lends you couple of thousand dollars converted into bitcoin from their coinbase account to yours?

the loan itself is not taxable because it's not income. any gains or losses you made (eg after taking the loan) will affect your taxable income though.

Quote from: sann111 on January 29, 2019, 02:47:14 AM

Will there be tax on this? I hope not. But can coinbase or anyone who knows help? There has been a severe loss nothing gained.

i'm not sure about all tax jurisdictions, but you generally won't be taxed on capital losses. in fact, capital losses can often be used to offset your other taxable income. in the USA, investors can deduct their capital losses up to $3000 per year. so if your net capital loss from trading bitcoin was $2k, your total taxable income would be reduced by that amount.