Compare order routing reports, options assignment fees, outgoing transfer charges, and margin interest tables before funding a dollar. Look for SIP versus proprietary feed usage, fractional trading policies, and pre‑market liquidity. Test customer support responsiveness. Start with a tiny deposit and two tiny trades to verify statements match behavior under real, slightly volatile conditions.
Commission-free orders can still leak value through wider spreads, slippage, and poor routing. Place simultaneous paper quotes on multiple platforms, watch effective spread, and compare fills to mid‑price. Prefer limit orders on thin names. Review quarterly Rule 606 reports and best‑execution statistics for concrete evidence beyond marketing screenshots and cherry‑picked backtests.
Zero commissions often coexist with rich margin rates, debit card markups, and low cash sweep yields. If you sell options, examine assignment processing, exchange fees, and exercise cutoffs. Ask how short interest and hard‑to‑borrow fees are calculated. Small percentages compound painfully when you scale recurring strategies or maintain collateral through choppy markets.
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