Published
We've written about how trading fees kill scalpers — the toll you pay every time you open and close. Funding is the other meter, and it's the one that punishes the opposite behaviour: holding. Where trade fees scale with how often you trade, funding scales with how long you stay in and how much leverage you carry. Most people glance at the tiny funding rate and ignore it. So let's do what nobody does and run the number on a held position.
What funding actually is
A perpetual future has no expiry, so exchanges use funding payments to keep the perp price tethered to spot. Every funding interval — typically every 8 hours, so three times a day — one side pays the other. When the perp trades above spot (more longs than shorts, the usual case in a bull market), longs pay shorts. When it's below, shorts pay longs. The key detail people miss: funding is charged on your notional position size, not on the margin you posted. That's the same trap as trading fees, and leverage makes it bite exactly the same way.
The "tiny" rate, annualized
The baseline funding rate on major perps sits around 0.01% per 8-hour interval. Three intervals a day:
- 0.01% × 3 = 0.03% per day of notional
- × 365 = ~10.95% per year of notional
So just to hold a long open at the calm baseline, you're paying roughly 11% a year on the full position value — before the market does anything. That's already in the range of a credit card carrying balance, on a number most traders treat as noise.
Now add leverage
Funding is on notional, your account feels it in margin, so leverage multiplies the pain — identical mechanics to fee drag. Post $100 of margin at 20x = $2,000 notional:
- One interval: 0.01% × $2,000 = $0.20
- Per day (3 intervals): $0.60 — that's 0.6% of your $100 margin, daily
- Over a 30-day hold: $18, or 18% of your margin gone to funding alone
Eighteen percent of your stake, in a flat market, just for the privilege of staying long for a month at 20x. Crank it to 50x and the same baseline funding eats 1.5% of margin a day — about 45% over a month. The leverage slider you thought was for upside is, once again, a cost multiplier on a guaranteed bill.
And funding doesn't stay at baseline
Here's where it turns from a drip into a wound. When the market gets greedy and everyone piles into longs, funding spikes. Rates of 0.05% to 0.1%+ per 8h are common in hot conditions, and extreme episodes have run higher still. Take a sustained 0.1% per interval:
- 0.1% × 3 = 0.3% per day of notional
- At 20x: 6% of your margin every single day
- Annualized: ~109% of notional per year
At that rate a long at 20x loses 6% of its margin a day to funding while you wait — the position can be perfectly right on direction and still bleed out. The cruel irony is that funding spikes hardest exactly when the crowd is most long, which is usually near the top, right before the move that would have hurt anyway.
The quiet part: funding can be your edge
Every dollar a long pays is a dollar a short receives. When funding is richly positive, holding the short side earns that ~11%/yr (or much more during spikes) as a carry — which is the entire basis of delta-neutral "funding farming." You don't have to trade it to use it: persistently high positive funding is a sentiment gauge telling you the long side is crowded and paying through the nose to stay there. Negative funding says the opposite. It's free information sitting in plain sight above every perp chart.
What the math says to do
- Check funding before you hold, not after. A trade you'd keep for days or weeks needs the funding cost in the plan. At 0.03%/day it's a tax; at 0.3%/day it can be bigger than your target move.
- Lower leverage for held trades. Funding-per-day-of-margin is leverage × rate × 3. The single biggest lever you control is the multiplier.
- Don't fight extreme funding. If you're paying 0.1%/8h to be long, the crowd is on your side of the boat and the exchange is charging you rent for the seat. Size down or wait.
- Mind which side pays. In a downtrend shorts often pay longs — the carry flips. Read the sign, don't assume.
None of this is complicated; it's one multiplication almost nobody runs. The funding number is small precisely so you'll ignore it — and over a long hold at leverage, it's often the difference between a winning trade and a flat one. Run it on your own position in the calculators below.
Method: funding illustrated at a 0.01% per-8h baseline (3 intervals/day) and a 0.1% elevated case, representative of major USDT-perp funding as of June 2026; actual rates float continuously and vary by exchange and asset. Trading fees are excluded here and only add to the cost. Figures are arithmetic, not a backtest — but the relationship between funding, leverage and daily margin drain is exact.
- Funding fee calculator — what holding actually costs at your rate and leverage
- Real futures profit calculator — P&L after fees and funding
- Break-even calculator — the move you need to clear all costs
- Position size calculator — size from risk, not impulse
- Liquidation calculator — how close the edge really is