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How to account for Capital Gains (Losses) in double-entry accounting?
Capital is an Asset. Decreasing value of capital is the decreasing value of an asset. When you buy the forex asset * DR Forex Asset * CR Cash When you sell * DR Cash  * CR Forex Asset The difference is now accounted for Here is how: Gains (and losses) are modifications to your financial position (Balance sheet). At the end of the period you take your financial performance (Profit and Loss) and put it into your balance sheet under equity. Meaning that afterwards your balance sheet is better or worse off (Because you made more money = more cash or lost it, whatever). You are wanting to make an income account to reflect the forex revaluation so at the end of the period it is reflected in profit then pushed into your balance sheet. Capital gains directly affect your balance sheet because they increase/decrease your cash and your asset in the journal entry itself (When you buy and sell it). If making money this way is actually how you make you make an income it is possible to make an account for it. If you do this you periodically revalue the asset and write off the changes to the revaluation account. You would do something like *DR Asset *CR Forex Revaluation account; depending on the method you take. Businesses mostly do this because if the capital gains are their line of business they will be taxed on it like it is income. For simplicity just account for it when you buy and sell the assets (Because you as an individual will only recognise a profit/loss when you enter and exit). Its easier to think about income and expenses are extensions of equity. Income increases your equity, expenses decrease it. This is how they relate to the accounting formula (Assets = Liabilities + Owners Equity)