How to flip Coal in OSRS

Flipping Coal on the Old School RuneScape Grand Exchange currently makes about -4 gp profit per item after the 2% GE tax: buy near 117 gp (the instant-sell price) and re-list near 115 gp (the instant-buy price).

• Buy at (instant-sell): 117 gp
• Sell at (instant-buy): 115 gp
• Margin after 2% tax: -4 gp (-3.42% ROI)
• Buy limit per 4 hours: 13,000
• 24h volume: 41,010,352 (extremely liquid)
• Max profit per limit cycle: -52,000 gp on 1,521,000 gp of capital

The flip, step by step

1. Place a buy offer at or just above 117 gp (the current instant-sell price).
2. Wait for the fill. Coal is extremely liquid right now, so offers at fair prices typically fill within minutes.
3. Re-list at or just below 115 gp (the current instant-buy price).
4. The GE takes 2 gp tax (2%) per item when it sells, leaving -4 gp profit each.
5. Repeat up to the buy limit (13,000 per 4 hours), a full cycle is -52,000 gp on 1,521,000 gp of capital.

Margins move constantly. Re-check the live Coal numbers and price chart on GrandExchange.com right before committing.