Date: 201909
Local time of day: 1201-1800
Location: TPA.Airport, FL
Flight conditions: VMC
Weather elements / visibility: 100
Light: Daylight
Aircraft: Learjet 55
Operator: Corporate
Operating under: Part 91
Flight plan: VFR
Mission: Passenger
Flight phase: Descent
Airspace: Class B TPA
ATC / advisory: TRACON TPA
Reporter organization: Corporate
Reporter function: Captain; Pilot Flying
Reporter qualification: Flight Crew Flight Instructor; Flight Crew Instrument; Flight Crew Multiengine; Flight Crew Air Transport Pilot (ATP)
Human factors: Human-Machine Interface; Situational Awareness
Second reporter function: First Officer; Pilot Not Flying
Anomaly: Airspace Violation All Types; Deviation / Discrepancy - Procedural Published Material / Policy
Detector: Person Air Traffic Control
When detected: In-flight
Result: Air Traffic Control Provided Assistance; Flight Crew Requested ATC Assistance / Clarification; Flight Crew Became Reoriented
Contributing factors: Human Factors
Primary problem: Human Factors

Narrative: Event occurred at the top of descent (while squawking 1200 with Mode C) during a routine intra-state repositioning flight.Twenty nautical miles after crossing directly over Tampa's Class Bravo geographic center-point; we initiated a VFR/VMC descent from 10;500 feet while continuing to fly southwest.We were avoiding local traffic visually; monitoring local TPA TRACON radio; TCAS as well as ADS-B (participating traffic). Inside the 30 mile Mode C ring there was only one other aircraft in our vicinity; which we maneuvered to cross five miles in trail. No traffic conflict occurred.Thirty nautical miles southwest of TPA we reversed course while continuing to descend to 1;600 ft. We also flew to be 500 ft. below TPA's 3;000-10;000 ft. twenty nautical mile outer shelf.At that time we proceeded to contact TPA on their local TRACON frequency. We informed TPA who we were; where we were and what we wanted to do.Tampa's TRACON Controller asked us if we knew that we had entered Class B Airspace without a clearance. I responded 'no' and said we had remained at 10;500 ft. until crossing beyond and outside of the twenty mile 10;000 ft. ring and that we had then re-crossed the same 20 mile ring at 2;500 ft.; which was 500 feet below the outer shelf's floor.He replied; yes you did; but that the Southwestern Control Airspace at Tampa now extends all the way out to the 30 NM Mode C Ring. My First Officer and I simultaneously expanded out our VFR Charts utilizing the EFB Foreflight on iPads to discover this to be true. I acknowledged the Controller's reprimand apologetically and said it would never happen again.My First Officer and I had thoroughly reviewed the flight to be conducted; including a standard briefing with Flight Services; but had not detected this change from the standard Class B configuration. At the time of our transgression we had our VFR and GPS maps zoomed in to cleanly display traffic on our navigation devices.This was very embarrassing. A lesson learned; which will be put into practice during all subsequent flights.


Second narrative: [Report narrative contained no additional information].


Synopsis: LR55 flight crew reported that their failure to correctly read airspace parameters resulted in a Class B airspace incursion.