You make 20U from a single trade, close the page, and think, “Not bad today.”

You might check the monthly statement, only to find the balance hasn’t increased much.

The reason isn’t necessarily all in the market. There’s a pot of money that seems small each time, but once it adds up, it really stands out: fees.

Many people are willing to spend a few hours researching entry and exit points, but very few spend ten minutes checking how much fee they paid in a month.

This bill is really worth calculating once.

Fees look low because you only looked once.

0.05%, which is five ten-thousandths.

At first glance, it really doesn’t seem like much. But fees are usually calculated based on the trade value, not just on the margin you put up. Also, opening and closing positions typically both incur charges. In the publicly available contract fee explanations, they may use 0.05% as an example for the taker fee rate; your actual fee rate depends on the trading instrument, your account tier, and any available discounts.

For example, the U below refers to USDT.

Suppose you put up 1,000U as margin and open a position worth 10,000U. Opening and closing both charge a trading fee of 0.05%.

This opening trade:

10,000 × 0.05% = 5U.

Assume the executed amount when closing positions is also around 10,000U—then it’s another 5U.

In and out—total about 10U.

That’s equivalent to 1% of this 1,000U margin, and it has already been used for trading fees. This hasn’t yet accounted for funding fees, slippage, or any profit/loss from the trade itself.

If this spread profit is 20U, after deducting about 10U in fees, what’s left is only about 10U.

So, how much this order “made,” and how much it finally ends up “in your pocket,” are sometimes not the same thing.

What’s more easily overlooked is the frequency.

Assume each trade size is about the same. If you fully open and close positions 5 times a day, that’s about 50U in trading fees. If you operate 20 days in a month, the total becomes about 1,000U.

This is just an accounting example under a fixed trade size, not a recommendation to trade this way. It shows that although the fee rate may look small, it doesn’t necessarily mean your total cost is low.

Does the invitation code matter? The key is: who gets the discount?

Some people think when registering that it doesn’t matter whether you fill in the invitation code, because it doesn’t affect usage anyway.

The functionality may not be much different, but the fee treatment may not be the same.

Some exchanges’ invitation programs provide eligible invited users with trading-fee rebates or discounts. After you complete the binding using an invitation link or invitation code with the corresponding promotion, the trades that meet the rules may receive the discount.

But there’s a detail here that must be clarified:

Just because the inviter can earn a commission doesn’t mean you can definitely receive the same proportion of rebates.

Some campaigns offer one-time rewards, others offer trading-fee discounts, and some offer ongoing rebates. Don’t just look at the largest number in the promotion material—see how much the discount for the “invited user” is written on the page.

For example, in a publicly available contract invitation notice, it may list an arrangement where invited users receive a 40% trading-fee discount. The exact applicable situations depend on your account and the event page.

Let’s stick with the previous account:

Suppose that in a given month you originally needed to pay 1000U in trading fees, and all these transactions meet the 40% discount criteria. After the discount, your cost becomes 600U—so you spend 400U less.

If an event uses a post-trade rebate, you need to check the actual credited records. If it uses a direct discount, you need to check the actual amount deducted. You can’t calculate both again.

This 400U isn’t money earned from doing more trades; it’s a portion of the costs that you would have originally had to pay that got reduced. For people who already have trading needs, this difference is very practical.

Existing registered users can also check their eligibility.

If you didn’t bind an invitation at registration, it doesn’t necessarily mean you have zero chance. For example, taking Binance’s old-user reactivation program: some older users who previously did not bind an invitation relationship and meet account duration and inactivity/disabled conditions may be able to set up an invitation relationship through a specified link. Not all old users can re-bind, and it doesn’t mean you can freely change to a different inviter.

For this point, just verify directly through the official page or by contacting customer service—don’t rely on only one sentence like “anyone can apply.”

In the end, I think the most worthwhile small thing to do before trading is to open up and review the invoice.

Check how much trading fee you paid in total over the past 30 days, then see whether your account actually received the corresponding discounts.

But don’t increase the number of trades just to get rebates. If you pay 100U in fees to get back 40U, you still end up paying 60U.

Save on fees whenever you can—but doing one unnecessary trade usually matters more than spending half a day researching a promotion.