home *** CD-ROM | disk | FTP | other *** search
- Xref: sparky rec.puzzles:8169 can.general:6192
- Newsgroups: rec.puzzles,can.general
- Path: sparky!uunet!uunet.ca!wildcan!sq!sherman
- From: dave@lsuc.on.ca (David Sherman)
- Subject: GST registration number check digit: puzzle and prize
- Message-ID: <1992Dec31.044137.22920@sq.sq.com>
- Sender: sherman@sq.sq.com (David Sherman)
- Organization: The Law Society of Upper Canada
- Distribution: can
- Date: Thu, 31 Dec 92 04:41:37 GMT
- Lines: 37
-
- Virtually all businesses in Canada are registered for the Goods and
- Services Tax (GST) and receive a registration number, which is "R"
- followed by nine digits. This number goes on invoices and cash
- register receipts (to allow business purchasing goods and services to
- recover the GST they pay), so it's not at all secret.
-
- Included in the 9 digits is a check digit. Revenue Canada Excise,
- which administers the GST, refuses to release the formula for the
- check digit, stating that it "relates to an internal procedure for
- verifying registration numbers".
-
- I challenge rec.puzzles readers to work out the formula for the check
- digit. If you are in Canada, you can collect GST registration numbers
- by simply looking at any receipts you have lying around. If you're not
- in Canada (despite the Distribution: can to this posting), here are some
- valid numbers:
-
- R123965659 R130134310 R111046959
- R121425516 R100573278 R104757711
- R121598072 R125509950 R132475302
- R110191434 R102420296 R105233795
- R120989157 R121560379 R106353063
- R100976786 R122481427 R121320907
- R102453032 R105059216 R105254007
- R105072136
-
- Please email solutions to me, dave@lsuc.on.ca.
- Prize to the first correct answer: an autographed copy of the
- "Practitioner's Goods and Services Tax, Annotated" (2nd edition)
- -- 1,000 pages of annotated GST legislation and regulations, a
- sure cure for insomnia! Plus, if you want, honourable mention
- in the "GST Times" newsletter that I write (read by thousands
- of accountants and lawyers across Canada).
-
- David Sherman
- Toronto telephone # 416-889-7658, fax # 416-889-3246
- Editor-in-Chief, "Canada GST Service" (looseleaf, 6 volumes)
-