Is it better to buy calls before or after earnings?

After the report, implied volatility has usually dropped, so the same strike and expiration tends to cost less. You give up the overnight gap in exchange. Buying beforehand makes sense only if you expect a move larger than the at-the-money straddle implies and can accept losing most of the premium if the move falls short.

How do I find the expected move before earnings?

Take the at-the-money call's price and add the at-the-money put's price, using the first expiration after the report. That straddle divided by the share price is roughly the move the options market expects, in either direction. A $100 stock with an $8.00 straddle implies a move of about 8%.

What is a cheaper way to trade a bullish earnings view?

A call debit spread buys one call and sells a higher strike call in the same expiration. The sold call's inflated premium pays for part of the one you buy, and because both legs lose implied volatility after the report, the crush does less damage. Owning the shares avoids the crush entirely and carries the full gap risk.

Buying Calls Before Earnings: Paying for a Move Already Priced In

Why did the call lose money when the stock went up? The answer was in the option’s price before the report came out, printed on the chain for anyone who looked.

What the option price already contains

In the days before a report, implied volatility climbs. Everyone can see the date. Everyone knows the stock may jump or drop overnight. So sellers demand more for any option that expires after the date, buyers pay it, and the premium on those contracts swells until the report is out.

Once the report is out, the uncertainty is gone. Implied volatility usually falls hard on the next open. That drop is the IV crush, and it takes a slice of every option’s value with it, whichever way the stock moved. It happens on good news too. The crush hits calls and puts alike, and it hits the nearest expiration hardest, since most of what that contract was worth before the open was the report itself and very little else.

You can read the size of the expected move straight from the option chain. Add the at-the-money call to the at-the-money put in the earliest expiration that includes the report.

Options traders expect roughly an $8 swing. A call buyer pays $4.20 for the upside half of that bet.

A $100 stock that rises: $105 against $103

Buy the 100 call for $4.20. The report comes out and the stock rises. What happens next depends on how far.

At $103 you were right about direction. You still lost $100 a contract, because the call went in holding a lot of time value inflated by the coming report, and after the report only $0.20 of it was left on top of the $3.00 of intrinsic value.

The hurdle is the premium itself. For the call to break even the morning after, the stock has to rise far enough that intrinsic value plus the small remaining time value adds back up to $4.20. In this example that means a rise of a little over $4, roughly half the straddle’s $8, and the market has already told you it thinks a move of that size is ordinary.

Why being right is not enough

Price the bet the way a bookmaker would. The straddle says an $8 move is normal here. A call buyer collects only on the up side. That side costs $4.20. It is full price for an outcome the market already calls routine.

So a call bought before the report makes money only when the stock goes up, goes up by more than the crush takes away, and does so quickly enough that time decay has not eaten the rest. Miss any of those and the trade loses. It can lose most of the premium on a stock that did roughly what the chain predicted, which is the part that catches first-time buyers.

The strongest case for buying the call

The best argument for the trade is defined risk. The most you can lose is $420 a contract. If the stock gaps 15%, you collect most of that move with a small outlay. A holder of 100 shares at $100 risks far more on a bad report.

That argument holds. It covers one situation, though: you expect a move larger than the market does. If you have a reason to believe the report will surprise by more than 8%, perhaps because the factors that move a stock after earnings point one way harder than the options reflect, buying the call is a fair way to express it. The difference between implied and historical volatility helps here, since a stock whose past report moves ran well above its current implied move gives you a reason to think the options are cheap.

Without that reason, you are paying retail for the market’s own forecast.

Cheaper ways to hold the same view

If you expect a good report and an ordinary move, these routes cost less.

Buy a call debit spread. You buy the 100 call and sell one at a higher strike with the same expiration date, and the sold leg’s inflated premium offsets the crush on the leg you own.
Own the shares. There is no implied volatility to lose. A $3 rise is a $3 gain, though the gap risk runs both ways in full.
Wait for the report. Buy the call after the open. By then implied volatility has dropped and the news is known.

More earnings setups and checks are collected on the earnings desk.

The verdict: buy the call only when you expect more than the market does

Buying calls before earnings pays when the move beats what the options already price, and it loses when the move is ordinary, even in the right direction. Check the straddle before you buy. If your view is a normal-sized beat, use a spread or the shares, and keep outright calls for the reports where you have a reason to expect a bigger move than the chain is quoting. The arithmetic shifts with the time left on the option and with how far implied volatility ran up before the date, so rerun it on the actual chain each time.