+If tax classes are enabled, a row is created in every tax class for
+every district.
+
+Customer addresses aren't classified into districts here. Instead,
+when a Washington state address is inserted or changed in L<FS::cust_location>,
+a job is queued for FS::geocode_Mixin::process_district_update, to ask the
+Washington state API which tax district to use for this address.
+
+Options:
+
+ -f <filename>: Skip downloading, and process the given excel file
+
+ -t <taxname>: Updated or created records will be set to the given tax name.
+ If not specified, conf value 'tax_district_taxname' will be used
+
+ -y <year>: Specify year for tax table - defaults to current year
+
+ -q <quarter>: Specify quarter for tax table - defaults to current quarter
+
+ -l <lookup>: Attempt to look up the tax district classification for
+ unclassified cust_location records in Washington. Will
+ notify of records that cannot be classified
+
+=head1 Washington State Department of Revenue Resources
+
+The state of Washington makes data files available via their public website.
+It's possible the availability or format of these files may change. As of now,
+the only data file that contains both city and county names is published in
+XLSX format.
+
+=item WA Dept of Revenue
+
+https://dor.wa.gov
+
+=item Data file downloads
+
+https://dor.wa.gov/find-taxes-rates/sales-and-use-tax-rates/downloadable-database
+
+=item XLSX file example
+
+https://dor.wa.gov/sites/default/files/legacy/Docs/forms/ExcsTx/LocSalUseTx/ExcelLocalSlsUserates_19_Q1.xlsx
+
+=item CSV file example
+
+https://dor.wa.gov/sites/default/files/legacy/downloads/Add_DataRates2018Q4.zip
+
+
+=item Address lookup API tool
+
+http://webgis.dor.wa.gov/webapi/AddressRates.aspx?output=xml&addr=410 Terry Ave. North&city=&zip=98100