Learjet 31
Flight Crew Flight Instructor; Flight Crew Instrument
Flight Crew Last 90 Days 150; Flight Crew Total 20000; Flight Crew Type 1500
Conflict Ground Conflict; Critical; Deviation / Discrepancy - Procedural Clearance; Ground Incursion Runway
Flight Crew Executed Go Around / Missed Approach
Human Factors
I was given taxi instruction; which I read back. It included a 'Hold short of Runway XX.' Which I read back. In the middle of shutting things down in the cockpit I missed the hold short line and stopped short of the runway. The aircraft in question was overhead already approximately 300 feet.  No excuse; I just got busy and missed a hold short. I have well over 20;000 hours; most if it at night flying freight; which involved many multiple landings during night. This is the first time with such an occurrence; hopefully the last. At no time was the other aircraft in any danger from my inaction/action.
LR-31 Captain reported that he taxied past the runway hold short line that resulted in the aircraft on final executing a go-around.