How to flip Guthan's helm in OSRS

Flipping Guthan's helm on the Old School RuneScape Grand Exchange currently makes about 10,113 gp profit per item after the 2% GE tax: buy near 242,528 gp (the instant-sell price) and re-list near 257,796 gp (the instant-buy price).

• Buy at (instant-sell): 242,528 gp
• Sell at (instant-buy): 257,796 gp
• Margin after 2% tax: 10,113 gp (4.17% ROI)
• Buy limit per 4 hours: 15
• 24h volume: 340 (moderately traded)
• Max profit per limit cycle: 151,695 gp on 3,637,920 gp of capital

The flip, step by step

1. Place a buy offer at or just above 242,528 gp (the current instant-sell price).
2. Wait for the fill. Guthan's helm is moderately traded right now, so fills can take an hour or more, patience pays here.
3. Re-list at or just below 257,796 gp (the current instant-buy price).
4. The GE takes 5,155 gp tax (2%) per item when it sells, leaving 10,113 gp profit each.
5. Repeat up to the buy limit (15 per 4 hours), a full cycle is 151,695 gp on 3,637,920 gp of capital.

Margins move constantly. Re-check the live Guthan's helm numbers and price chart on GrandExchange.com right before committing.