Date: 201708
Local time of day: 1201-1800
Location: ZZZ.Airport, US
Light: Daylight
Aircraft: B737 Undifferentiated or Other Model
Operator: Air Carrier
Operating under: Part 121
Flight plan: IFR
Mission: Passenger
Flight phase: Taxi
ATC / advisory: Tower ZZZ
Reporter organization: Air Carrier
Reporter function: Pilot Flying; Captain
Reporter qualification: Flight Crew Air Transport Pilot (ATP)
Human factors: Communication Breakdown; Situational Awareness
Anomaly: ATC Issue All Types; Deviation / Discrepancy - Procedural Clearance; Deviation / Discrepancy - Procedural Published Material / Policy; Ground Incursion Runway
Detector: Person Flight Crew
When detected: Taxi
Contributing factors: Procedure; Human Factors
Primary problem: Human Factors

Narrative: It was the last leg of a long five days of flying. We were well rested; however; we had just finished a two hour lunch break. The aircraft was full (with a jump seater) and a very senior crew in the back. The weather was fine and we pushed for a short taxi to [the runway].While taxiing out we could see and hear no other aircraft on the ramp or frequency. Half-way; Ground asked if we would be 'ready at the end'. We both thought that meant to expedite our taxi for a quick takeoff; so the First Officer responded we would be. With no one else in sight; and our 'get the job done company attitude' I bumped the throttles for the throttle burst check; called for the checklist and sped up my taxi. We were onto [the taxiway at the departure end of the runway] in no time; approaching the hold short line and had just finished the checklist. It was at that point; upon stopping the aircraft that we were ANTICIPATING to be cleared for an immediate takeoff. After a few seconds; the Tower Controller started to give us the normal takeoff clearance and I began to roll the aircraft to takeoff position. The Tower's clearance was '[Company]; RNAV to ZZZZZ; Runway XYR; [Company]; STOP.' Unfortunately I was arming the autothrottles; selecting LNAV; verifying the flight director switches; taxiing forward; and had already crossed the line. I knew immediately what had happened; I looked left and saw the company aircraft on final and also knew that the spacing for takeoff had been lost. I told Tower that I had crossed the hold short line and they told the company flight to go around.Yes; I wish I had verified the coast was clear first; and not after I began poking the auto pilot buttons; then I would have then ignored the Controller's initial statements and stayed put. However; the statement and tone of the Ground Controller's query seem to both the First Officer and I that they were helping us expedite our departure and we would not be stopping at the end of the runway. Normally I look left; but for some reason; today; I was in a hurry and assumed there would be no one at the end of the runway. Ultimately; this was the PICs fault for not 'looking before leaping' and letting my guard down when there were almost no threats present.The best course of action to prevent this from reoccurring is for the PIC to return to the habit of ALWAYS clearing the approach end of the runway prior to crossing the hold short line. Also slowing down and let the Controller finish the full clearance prior to moving. However; this type of 'get ready to go immediately' attitude is common practice at [large metropolitan airports]; where timing is critical during high traffic periods.




Synopsis: B737 Captain reported they crossed the runway hold short line prior to getting clearance from ATC.