Back Office

W-9s, certificates of insurance, vendor portals and worker-classification tests: the paperwork that decides whether you can invoice at all.

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About this section

Twelve years of freelance copywriting and video production left Delia Marsh with two files worth keeping: every contract she signed, and every invoice that went unpaid — around forty of the second kind, chased through reminders, demand letters, and small claims court. She is not a lawyer and does not practise law. Where a page relies on a statute, an agency rule, or a filing deadline, it names the section, links the agency's own text, and prints the date that text was last read.

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Every guide cites the agency, statute, or document it was checked against, and carries the date it was checked. Rules change — if something here is out of date, tell us and it gets corrected.