SMT PLT FORGOT TO CLR CUSTOMS ON ARR IN SYR FROM CANADA.

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ON MAY/SUN/93 I FLEW TO TORONTO AGAIN TO RETURN 2 PAX. BEFORE DEPARTING TORONTO; I CALLED UNITED STATES CUSTOMS TO CONFIRM THAT I EXPECTED TO ARRIVE AT SYRACUSE AROUND XA15. AGENT SAID THAT HE MAY BE BUSY; BUT THAT HE WOULD GET TO ME AS SOON AS HE COULD AFTER I ARRIVED. I THANKED HIM; AND DEPARTED ON MY IFR FLT PLAN TO SYRACUSE ALONE. AT SYRACUSE; THE PRIMARY RWY IS 10/28. ALL GA IS BASED S OF RWY 10/28; AND GA ACFT RARELY TAXI N OF IT. CUSTOMS PARKING; HOWEVER; IS N OF RWY 10/28; AS THE CUSTOMS OFFICES ARE LOCATED IN THE ACR TERMINAL BUILDING. I LANDED ON RWY 28; AND DURING ROLLOUT SYRACUSE GND CTL CALLED 'TURN L NEXT TXWY; REMAIN THIS FREQ; TAXI TO THE RAMP.' I HAD LANDED ON RWY 28 LITERALLY HUNDREDS OF TIMES; AND THIS WAS A TYPICAL INSTRUCTION FROM GND CTL; BECAUSE ALL GA ACFT (EXCEPT THOSE GOING TO CUSTOMS) NEED TO TAXI TO AN FBO ON THE S SIDE. I HAD NO PAX WHO MAY HAVE REMINDED ME THAT WE NEEDED TO CHK IN AT CUSTOMS. I SIMPLY FELL INTO MY USUAL HABIT OF COMPLYING WITH GND CTL'S INSTRUCTIONS AND TAXIED TO MY HOME FBO. GND CTL DID NOT KNOW I NEEDED TO CHK IN AT CUSTOMS. I SIMPLY FORGOT; AND DROVE HOME. ON MAY/MON/93 I RECEIVED A PHONE CALL FROM AGENT OF UNITED STATES CUSTOMS AT SYRACUSE; WHO INFORMED ME OF MY VIOLATION. I WAS SHOCKED AT MY MISTAKE; AND I APOLOGIZED FOR IT. SUGGESTION: IN THE PROCESS OF CLOSING THE IFR FLT PLAN; CAN THE CTL TWR PASS ON TO GND CTL THE FACT THAT THE FLT ORIGINATED IN CANADA; AND THAT THE AIRPLANE SHOULD TAXI TO CUSTOMS?