Comparing true trading costs: do rebates actually come close to making up for wider spreads?

I’ve been comparing a few brokers and I keep hitting the same question: is it better to chase the lowest spreads or the best rebate percentage?

Obviously the answer is probably “it depends,” but I want to actually understand what the math looks like. I’ve seen brokers advertise 0.5 pip spreads with no rebate, and others with 1.2 pip spreads but 40% cashback or whatever the offer is.

I know GlobeGain provides rebate tracking, so theoretically I could calculate this, but I’m trying to understand the framework first before I start testing with real money.

Does anyone track their actual costs over time? Like, do you know what you’re really paying per lot after the rebates kick in? And does that number change your broker choice, or is execution quality more important than the math?

I’m not trying to optimize for every last pip, I just don’t want to pick a broker without understanding what I’m actually paying.

Calculate this way: your true cost per lot equals spread plus commission minus rebate.

Example: Broker A has 0.9 pip spread, zero commission, zero rebate. Cost is 0.9 pips. Broker B has 1.8 pip spread, zero commission, but GlobeGain gives you 0.6 pip rebate. True cost is 1.2 pips. Broker A wins.

But here’s what most traders miss: slippage and execution quality cost more than both combined. A broker that delays your order entry by even half a second during volatile times can cost you 2-3 pips per trade. That wipes out any spread savings.

Calculate expected yearly costs based on your trading volume, then test each broker with small positions. Real execution matters more than spreadsheet math.

Spread plus commission minus rebate equals real cost.

I’ve been tracking this for about six months now with two different brokers.

One has tighter spreads but smaller rebates. The other has wider spreads but better cashback rates. Honestly, after calculating everything, they came out pretty close to each other in terms of actual cost.

What surprised me is that my execution quality and how much I slip on entries changed my true cost more than the spread or rebate differences did.

I’d say do the math for your specific volume, but don’t ignore how a broker actually feels when you’re trading. That matters more than winning by 0.1 pip on paper.

Calculate spread plus commission minus rebate for each broker. Test both for a few weeks before deciding.

Execution quality costs more than spread differences usually.

Most traders underestimate execution costs because they’re not as obvious as spread quotes. When you place a market order during news and the price jumps before your fill, that’s slippage. It’s real money out of your account.

I’ve seen traders save 0.2 pips on spreads while paying 1 pip in slippage on half their trades. The math still loses.

Track your actual slippage for each broker over 20-30 trades. Add that to your spread cost. Then subtract rebates. That’s your true cost per trade, and that’s what should drive your decision.

One thing I recommend is opening a demo account with each broker and paper trading for a week.

It won’t show you exact slippage or real rebate flow, but you’ll get a feel for the platform, how responsive it is, and whether the spreads actually hold up during volatile times.

Then do the math with your expected trading volume. But don’t make the decision on spreadsheet numbers alone. How it feels to trade matters too.

I learned this the hard way: a broker with 0.5 pip spreads that slips you 1 pip on half your trades costs more than a broker with 1 pip spreads that fills cleanly.

When I finally started tracking slippage alongside spreads and rebates, my broker choice flipped completely. The spreadsheet said one thing, real trading execution said another.

Calculate the math, but then test it. Your true costs only become clear when you’re actually trading live.