How Grand Exchange flipping works in OSRS
Buying low and selling high on the OSRS Grand Exchange: instant prices, buy limits, tax, and why margins shrink once everyone piles into the same item.
The two prices you are actually trading against
The Grand Exchange shows two live prices for a traded item: the instant-buy price (what you pay to get a copy right now) and the instant-sell price (what a buyer pays you right now). Flipping means buying at the lower of the two and reselling at the higher one, pocketing the gap, known as the margin, once tax is paid.
Those prices move with real trades as they happen, so a margin that looked good a minute ago can close as other players fill the same gap. This is the entire reason a live tracker is more useful here than a one-off price check.
Buy limits and the 4-hour window
Most tradeable items have a buy limit: a cap on how many of that item you can purchase within a rolling window, which resets 4 hours after your first purchase in that window. This exists to stop a single player from buying out the entire market and is why Varrock's tools quote a "profit per 4h" figure rather than an unlimited one; the real limit varies by item, so check the one shown on each item's own page rather than assuming a flat number.
Trading volume matters just as much as the limit: an item with a generous buy limit but almost no one trading it will not actually fill that limit in 4 hours. Varrock's flip finder and item pages show recent trade volume alongside the limit for exactly this reason.
Grand Exchange tax eats part of every sale
Selling an item (with a short list of exemptions) costs a tax, currently 2% of the sale price rounded down, capped at 5,000,000 gp on any single sale. That rate doubled from 1% on 29 May 2025, so copy or spreadsheets from before that date understate it. See the dedicated tax guide for the full exemption list and worked examples.
Every margin, score and profit figure on Varrock already has this tax subtracted, so the numbers shown are real take-home profit, not the raw price gap.
Why margins shrink, and how to work around it
The best-known flips attract the most competitors, so their margins get undercut fastest; this shows up on Varrock as a falling margin relative to its own recent average, flagged with a "Margin shrinking" badge. Spreading picks across more items, rather than everyone chasing the single top result, keeps margins from collapsing for everyone at once, which is why Varrock's flip finder varies its top picks between visitors instead of showing one universal list.
A flip score only reflects public data; it cannot see a lowball offer about to get undercut or a sudden supply dump. Always glance at the live spread in game before committing a large amount of gold.
Where to go from here on Varrock
The flip finder ranks every tradeable item by after-tax margin and volume with ready-made presets. The planner fills your actual free Grand Exchange slots within a cash budget. Signals scans for dips, spikes and volume surges across the whole market. All three are free.