A typical implementation takes six weeks, depending on the level of customization required by the
client. Weeks 1-4 are spent in development. Week 5 is for user training and system test, with
migration to production (or another database) in Week 6. This requires a commitment from both the
Tax and AP departments to handle data scrubbing, training, system test, and changes to procedures.
There are a number of issues that influence the design of the enhancement. These issues are
Taxable Determination. The new process needs to know if a particular voucher line is taxable or
exempt. One alternative is to use account on the voucher distribution; a second alternative is to use
the item number or usage code on the voucher. The use of TDM to determine exempt transactions is
possible, as long as a field on the voucher distribution line can be reliably populated. This decision
affects both the design for the extract and the set up of TDM in Vertex.
Determine Extract Criteria. Date range using voucher GL date is required. Other options include
Voucher Origin, Set of Books, or Vendor Class. Any grouping field on the voucher header or vendor
table may be used.
Use of Vendor Address. Determine if vendor address will be used for tax calculations. If vendor
address is not used, ship to location will be used for all tax parameters. If the majority of vendors
have separate order addresses set up, it may make sense to use the vendor address. If most
vendors only have remit to addresses, use the ship to location.
Legal Entity. Determine if legal entity or Set of Books can be used one to one as the taxing legal
entity, or if a cross-reference is needed.
Canadian Processing. Determine if multi-currency is needed to handle Canadian locations and
Freight. Freight can be rolled into the taxable bases, ignored, or treated as a separate line. Freight
must be entered at the voucher header and distributed to each line to be treated as a separate line in
Discounts. Discounts can reduce the taxable basis or be ignored.
AP Training issues. There are two impact areas: vendor and location maintenance, and AP invoice
entry. The AP entry clerk may be required to maintain a field to determine taxability, such as usage
code and ShipTo location.