You haven’t furnished enough information for a definitive answer.
Depending on how you trade, the answer could be anywhere from $10,000 to $500,000.
So, I’ll make some assumptions, and give you a range of answers.
Let’s say the following describes one month of your trading, and let’s say that every month is the same:
[ul]
[li]you trade mini-lots of currency pairs having the USD as cross-currency (that is, pairs of the form XXX/USD)
[/li]
[li]all trades have the same TP and the same SL, and in every case TP = SL (that is, R/R = 1)
[/li]
[li]you have x-number of NET winning trades per month (that is, number of winners - number of losers = x)
[/li]
[li]you make 320 (net) pips profit per month, and this produces a net dollar-profit of $10,000
[/li]
[li]your risk on each trade is 2% of your account balance
[/li][/ul]
Let’s run through one set of numbers.
Each month, 320 net pips generate a $10,000 profit. Therefore, each net pip generates $31.25 in profit. To earn $31.25 per pip, you have to trade 32 mini-lots, which yields $32 per pip, which is $10,240 profit per month on 320 pips profit.
Next, let’s say that you have 10 net winning trades per month. This could be the net result of 100 trades placed, with 55 winners and 45 losers, or any other combination of wins and losses.
Ten winning trades (net) produce 320 pips profit (net); so, each trade produces a profit of 32 pips.
Also, TP = SL in each case; so, your risk (SL) on each trade is 32 pips, as well. In each trade, position size is 32 mini-lots, so your dollar-risk per trade is: 32 pips x 32 mini-lots x $1 per pip per mini-lot = $1,024 risk per trade.
You limit your risk to 2% of your account balance, so [B]you need an account balance of $51,200, in this scenario[/B].
If you change the number of net winners per month (which changes the number of pips profit per winner), then the required account balance will change, as well. Assuming a constant number of pips per month, producing a constant net profit per month, the required account balance will be proportional to the number of pips profit per net winner.
Here are some other examples, which illustrate this proportionality:
[ul]
[li]Net winners per month: 40 — Pips profit per net winner: 8 pips — Account balance required: $12,800
[/li]
[li]Net winners per month: 20 — Pips profit per net winner: 16 pips — Account balance required: $25,600
[/li]
[li]Net winners per month: 10 — Pips profit per net winner: 32 pips — Account balance required: $51,200 (as above)
[/li]
[li]Net winners per month: 5 — Pips profit per net winner: 64 pips — Account balance required: $102,400
[/li]
[li]Net winners per month: 2 — Pips profit per net winner: 160 pips — Account balance required: $256,000
[/li]
[li]Net winners per month: 1 — Pips profit per net winner: 320 pips — Account balance required: $512,000
[/li][/ul]
Based on the examples above, I think you can use your own trading metrics to determine the account balance you need.
[B]Your question implies successful, consistent trading. Are you that good a trader?[/B]