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Forward Points: Reading the Numbers Behind Swap Charges

When you hold a position overnight, your broker applies a swap. The same idea in the institutional world uses forward points, the adjustment added to the spot rate to get a forward rate.

For a given date, the forward rate equals the spot rate plus or minus forward points. The size depends on the interest rate difference and the time until the settlement date. If one currency has higher interest rates, its forward points reflect that.

Take EUR/USD with dollar rates higher than euro rates. The forward points will typically make the forward EUR/USD rate higher than spot, because the euro is the lower-yielding currency and trades at a forward premium against the dollar. Holding long EUR/USD earns less interest than the dollar side, so the swap on a long position is typically negative, while short positions earn a positive swap, before broker markups.

On a retail platform, the daily swap approximates the forward points for one day, adjusted for the broker's margin and three days of interest on Wednesday rollover.

Understanding this relationship lets you check whether your broker's swap values are reasonable. Compare them with the interest rate difference between the currencies. A large gap between the theoretical and charged swap shows a high markup.

Swap values change as central banks move rates, and brokers update them periodically.

Practical step: estimate the theoretical daily swap for one standard lot from the policy rate difference, and compare with your broker's value.

Doing the theoretical swap calculation once is worth it. Rate gap times one lot's notional divided by 360 gets you close, and if your broker's number is way off from that, you know how much markup you're paying. Example: with a 2 percent rate gap, one standard lot of EURUSD is 100,000 euros, so the daily interest difference is about 100,000 times 0.02 divided by 360, which comes to roughly 5.5 euros a night before any markup. If your platform shows a short swap paying much less than that and a long swap charging more, the difference is the broker's margin. It's not a scandal, but it's useful to know when you plan to hold for weeks.

Also worth knowing the long and short swaps don't add up to zero at a retail broker. The gap between them is basically their cut. On some brokers and pairs it's small, on others it's big enough that both sides are negative even when there's a clear rate difference. That matters for swing traders who hold for several days. Compare the swap tables of two or three brokers for the pairs you hold most often, which takes a few minutes in the platform's symbol specifications. And remember the triple charge, usually on Wednesday night, which covers the weekend. A position held from Monday to Friday pays or earns seven nights of swap, not five.