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Stop-loss after fees

A stop-loss at 10% below your entry sounds like a 10% worst case. It isn't: you've already paid to get in, and you pay again to get out — twice over in FX on a US share. Enter your position to see what the stop really costs if it fires.

In the share's own currency or pence
%
£
UK shares (not ETFs) also pay 0.5% stamp duty on buys; not included.
£
%
Defaults are ii's published rates as of 2026 — change them for another broker.
Stop price180.00
Headline loss-£100.00
Fees (commission + FX, both ways)-£22.23
Real loss in pounds-£122.23
Real loss, % of money paid in-12.08%
Stop that really caps the loss at your %7.88%

Your 10.00% stop really loses £122.23, 12.08% of the £1,011.49 you paid in. To cap the real loss at 10.00%, set the stop 7.88% below entry.

What the stop-loss percentage leaves out

The stop percentage only measures the share price. Your money takes three more hits: the commission you paid to buy, the commission to sell (£3.99 each at ii's 2026 rates), and on a US share the FX charge of about 0.75% on the way in and again on the way out. On a £1,000 US position those add over £22 to a £100 headline loss.

Two more things make real losses worse than this calculator shows. A stop is an instruction to sell at the next available price, so in a fast fall or an overnight gap it can fill below the stop. And on a US share the exchange rate keeps moving; this calculator holds it constant.

The last line answers the practical question: if you want a 10% worst case in pounds, where should the stop go?

Stop doing this by hand. Headmars tracks your holdings across exchanges in pounds, with the fees on every trade recorded, so the return you see is the return you actually got.

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More calculators: ii FX fee calculator · US stock return in GBP