Accounting for currency depreciation
Yes - it's called the rate of inflation. The rate of return over the rate of inflation is called the real rate of return.   So if a currency experiences a 2% rate of inflation, and your investment makes a 3% rate of return, your real rate of return is only 1%. One problem is that inflation is always backwards-looking, while investment returns are always forward-looking. There are ways to calculate an expected rate of inflation from foreign exchange futures and other market instruments, though. That said, when comparing investments, typically all investments are in the same currency, so the effect of inflation is the same, and inflation makes  no difference in a comparative analysis.  When comparing investments in different currencies, then the rate of inflation may become important.
I think you might be missing something important here. If you are running a business, then any expenses that your business incurs are deductible.  Yes, Kickstarter would report the full amount. The IRS requires them to report everything that you raised. However, the Kickstarter and Amazon fees would be a business expense. Your cost on the backer rewards are deductible business expenses as well. Legal fees, accounting fees: deductible.  Money that you spend on equipment may not be deductible all in one year; you may have to depreciate it over multiple years. This is where the accountant that you are paying accounting fees to will come in handy.  People who do an iOS app Kickstarter campaign for $5000 might have a few things going on that you don't: Just tell your bank where you're going so they don't lock your account, and then take your Visa, and take enough cash to survive if something happens to your Visa account (sometimes banks lock them anyways out of idiocy). I usually take about 600 bucks cash for a week excursion (enough for food and a shack, or a mansion if you're in Asia). I figure, I'm carrying my passport which is worth thousands to criminals abroad around my neck. Why worry about carrying a little cash. As far as the Visa goes, just make sure your bank doesn't charge enormous fees for currency conversion. As far as carrying the local currency goes. I don't recommend it. Just figure out the conversion rate, and you'll save about  5% of your money from fees converting to and from. If you're going to Russia, do convert your currency first. "When trading Forex each currency is traded relative to another. So when shorting a currency you must go long another currency vs the currency you are shorting, it seems a little odd and can be a bit confusing, but here is the explanation that Wikipedia provides: An example of this is as follows: Let us say a trader wants to trade   with the US dollar and the Indian rupee currencies. Assume that the   current market rate is USD 1 to Rs.50 and the trader borrows Rs.100.   With this, he buys USD 2. If the next day, the conversion rate becomes   USD 1 to Rs.51, then the trader sells his USD 2 and gets Rs.102. He   returns Rs.100 and keeps the Rs.2 profit (minus fees). So in this example the trader is shorting the rupee vs the dollar. Does this article add up all other currency crosses to get the 'net' figure? So they don't care what it is depreciating against? This data is called the Commitment of Traders (COT) which is issued by the Commodity Futures Trading Commission (CFTC)  In the WSJ article it is actually referring to Forex Futures. In an another article from CountingPips it explains a bit clearer as to how a news organization comes up with these type of numbers. according to the CFTC COT data and calculations by Reuters which calculates the dollar positions against the euro, British pound, Japanese yen, Australian dollar, Canadian dollar and the Swiss franc. So this article is not talking about futures but it does tell us they got data from the COT and in addition Reuters added additional calculations from adding up ""X"" currency positions. No subscription needed: Speculators Pile Up Largest Net Dollar Long Position Since June 2010 - CFTC Here is some additional reading on the topic if you're interested: CFTC Commitment of the Traders Data – COT Report FOREX : What Is It And How Does It Work? Futures vs. Forex Options Forex - Wiki" "Fees & liabilities Yes, the first problem is that liabilities are being improperly booked. If the fee you charge is fixed upon deposit then the fee should credit ""Revenue"", the fee charged to you should be booked by crediting cash and then debiting ""Expenses"", and the remaining should be booked as a liability. If the fee is fixed upon withdrawal then this will become more complex because of the fact that a change in the fee can occur before it can be applied.  In this case, the current fee should be credited as ""Revenue"" and some ""Allowance for fee increase"" should also be credited.  The amount owed to the withdrawer should be booked as a liability as before. Multiple currency bookings I will assume that this is for a cryptocurrency service of some sort considering the comments in your question and your presence on bitcoin.se. Accounting can become very dangerous when mixing denominations.  This is why all major accounting standards mandate books be maintained single currency. In your case, if the deposit is in USD, for example, and the liability is in BTC then two books must be maintained, one for each. To account for your operation properly using single currency accounts, the denominations must be exchanged internally and balanced across the two sets of books. For a deposit of BTC/depository of USD, the operation would be the same as described above, but then the cash should be credited away and the liabilities debited away from the USD books with simultaneous cash debits and liability credits on the BTC books. Considering the extreme volatility of cryptocurrency exchange rates, denominating accounts on the wrong set of books will quickly lead to insolvency or loss from improper accounting or both. From revenue to income Revenue can be construed as a liability since it could theoretically exist on the balance sheet. I mention this because all books, despite their name and quarter, are really simply long T accounts, like a blockchain.  A blockchain could be subdivided into users' individual income statements & balance sheets, as the reverse of this concept. Revenues are credited, expenses are debited.  The difference, ""net income"", is debited away with a credit to ""owners' equity""." 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) The value of the asset doesn't change just because of the exchange rate change. If a thing (valued in USD) costs USD $1 and USD $1 = CAN $1 (so the thing is also valued CAN $1) today and tomorrow CAN $1 worth USD $0.5 - the thing will continue being worth USD $1. If the thing is valued in CAN $, after the exchange rate change, the thing will be worth USD $2, but will still be valued CAN $1. What you're talking about is price quotes, not value. Price quotes will very quickly reach the value, since any deviation will be used by the traders to make profits on arbitrage. And algo-traders will make it happen much quicker than you can even notice the arbitrage existence. The measure of change of value of a currency in relation to itself is inflation (or deflation). OANDA has a free online tool (a Java applet) that will do what you're asking.  Description: Currency Graph FXGraph:   Plot the   change between two currencies over any   time period Make a customized graph of historical   exchange rates for two of over 190   currencies, for any time period since   1990.   [...] Visit Currency Graph | OANDA.