The general pattern
Most forex-focused firms permit overnight and weekend holding on both evaluation and funded accounts. Most futures-focused firms require positions to be flat before the session close, often with an automatic liquidation a few minutes beforehand.
That difference is structural rather than arbitrary: futures accounts carry overnight margin requirements that a firm running many accounts does not want to fund.
Gap risk is account risk
This is the part that matters more than the permission itself. If your firm measures the daily loss limit on equity including floating loss, a weekend gap against your position is a loss the moment the market opens — before you can react.
A 1.5% gap on a position sized to risk 1% is now a 1.5% loss you did not choose to take, and if it lands on top of an existing drawdown it can close the account at the open. Holding through the weekend on a funded account is therefore a materially different decision from holding on a personal account, even when the firm permits it.
Costs
Swap or financing charges apply to positions held past the daily rollover, and on a funded account they are deducted from your profit before the split is calculated. Triple swap on Wednesday is the usual convention.
For a short-term strategy this is noise. For anything holding several days, it is a real cost that belongs in your expectancy calculation, and it is worth checking whether the firm passes through the raw swap or marks it up.
Automatic liquidation
Where holding is prohibited, find out exactly what happens. Some firms close positions automatically at a stated time and treat it as a normal exit. Others treat an open position at the cut-off as a rule breach, which closes the account.
Those are very different outcomes for the same mistake, and the difference is written in the terms rather than on the pricing page.
What to check before buying
- Is overnight holding permitted on the evaluation, the funded account, or both?
- Is weekend holding treated separately from overnight?
- What happens to an open position at the cut-off — auto-close or breach?
- Does floating loss count toward the daily limit at the open?
- How is swap charged, and is it marked up?
If your strategy needs multi-day holds
Then this is a hard filter, not a preference. Restrict your shortlist to firms that permit it, then size positions on the assumption that a gap can happen — which in practice means sizing against the distance to your breach level with a margin for a gap, rather than against your stop distance.
See position sizing against a drawdown for the arithmetic.