What it is — Slippage in Forex
Slippage is the difference between the price you requested and the price your broker actually filled. Order at 1.0850, filled at 1.0848? That's 0.2 pips of negative slippage.
It happens because markets move between your click and the fill — dramatically during news spikes, session opens, and thin liquidity. It can also be positive: fast markets sometimes fill you at a better price than asked.
Why it matters — Slippage in Forex
- It's a real cost of trading fast markets — budget 0.5–2 pips of slippage risk around major news.
- Order type controls it: market orders accept any price; limit orders can't slip negatively (they may simply not fill).
- Infrastructure matters: execution speed and server proximity (a VPS near the broker's servers) reduce — never eliminate — it.
Slippage in one worked example — ours
Our own position-size calculator ships this case, because it happened in our tests: 0.04 lots, 25-pip stop, planned risk $10 on a $1,000 account. Fill the stop 10 pips through the level — ordinary behavior in a fast market — and the loss is $14, shown in the calculator as 1.40% of the balance instead of 1%. That +40% overshoot is slippage, and it is not an edge case: it is what the stop is during news, gaps, and thin hours. The professional adjustment is one line of arithmetic: size the position so the with-slippage loss still fits your 1% — which either means a slightly smaller size or accepting that red-event days carry a wider true risk than the plan says.
Positive, negative, and the fill-certainty trade-off
Slippage cuts both ways: the same gap that fills your stop 10 pips through can fill your limit order 5 pips better. The asymmetry is structural: market orders guarantee the fill, not the price; limit orders guarantee the price, not the fill — see order types. In calm hours on major pairs, slippage is near zero; it concentrates exactly where profits tempt you most — the first minute after a red release, the rollover window, Sunday opens after weekends full of headlines. The calendar tells you when those windows are. Slippage cannot be eliminated, only budgeted: expect it, size for it, and never confuse a backtest’s frictionless fills with a live tape.
Frequently asked questions — Slippage in Forex
How do I reduce slippage?
Five levers: use limit orders for entries, avoid placing market orders in the first minutes after red-flag news, trade liquid sessions/pairs, choose a broker with strong execution stats, and use a VPS when automated.
What is positive slippage?
A fill better than your requested price — a market buy filled lower, a stop filled higher during a favorable gap. It happens as often as brokers' execution allows; budget for the negative kind and treat the positive kind as a bonus, never a plan.
How do I reduce slippage?
Trade liquid pairs in liquid hours, avoid the first minutes after high-impact releases, and prefer stops with guaranteed-ish distance rather than tight stops inside noise — the tighter the stop, the more a normal-size slip changes the loss in percent.
Is slippage broker manipulation?
Normally no — it's the market moving faster than your order travels. Genuine manipulation exists but is rare and prosecutable at regulated brokers; persistent unfair fills are a reason to switch, regulated brokers have recourse procedures.