Please provide the type of futures that you are trading on. Is it stock
options, or commodity futures, or debt contracts . . .
You might try to approach this software vendor to get some general
information and I'll explain to you more in detail.
http://www.armencomp.com/
In general, you have to report the stock option gains/ (losses) on schedule
D - Capital gain or loss, if you do commodities trading, the brokerage
house will have a statement at year end to tell you the the gaines and Losses
on the transactions that you have closed. For the open items, they will
show them as unrealized gain/ (losses). It's more or less of a statement to
see how your account changed from the beginning to the end of the year.
If you close out a position, you've completed a taxing event. Your wealth has
increased or decreased do to the trade, If the transaction is for stock or
stock trading, the broker will send you form 1099 to tell you how many transactions
have been closed during the year, one copy is forwarded to the IRS. They also
send you a copy of all of your purchases during the year, and you have to match
the cost to file your Schedule D for capital gain.
For commodities trading, the broker reports the gain and loss for you.
When you open a brokerage account, ask if the firm has the gainkeeper
software keeps track the gain or loss for the clients. This will save you
a lot of time and cost at the tax time.
You will get tax credit for the taxes that you pay to the US up to the
level that you would have to pay to the UK. Let say if you make $30,000
and you paid $4,500 for income taxes to the IRS, with this $30,000 you
would have to pay $6,000 in the UK. Your UK tax form will show the
tax on capital gain of $6,000 but you'll get a credit of $4,5000 for the
money that you've paid to the US, and you only have to pay $1,500
after credit.
If the UK only taxes $3,000 on the $30,000 gain, that will be all you
can get credit on your UK return. This is very likely since the UK has
the first $8,500 tax free on capital gain ( or $13,500). You can talk to the
UK tax authority on this scenario, my guess is that the tax that you pay
on the $8,500 capital gain in the US can't get credited from the UK side.
Hope this helps,
SC