Integrations
Excel and CSV import.
Drop in a spreadsheet and Plain Dot handles column mapping, validation, TIN matching, and filing.
What you get
Smart column mapping
We detect common headers automatically. Override mappings inline when needed.
Pre-flight validation
TIN format, address completeness, and amount fields are checked before submission.
Error reports
Download a clean error report for any rows that need fixing — edit and re-upload.
Any flavor of CSV
Comma, tab, semicolon, quoted, unquoted. If Excel can read it, so can we.