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Invoice Compliance Checklist

Audit any invoice against the rules that actually apply to your client — required vs recommended fields, region by region, with a copy-ready summary you can keep on file.

5 regions: US, UK VAT, EU, Australia, Canada Required vs recommended, side by side Copy-ready summary for your records
0 of 17 required items checked 0%

Identity

0 / 7

Document

0 / 6

Line items

0 / 5

Totals

0 / 5

Payment

0 / 5

Status

Missing required
17
Recommended pending
11
17 required items missing — your invoice may be rejected.

This checklist is general guidance, not tax or legal advice. Invoice rules vary by jurisdiction (and, in the US, by state) and change over time. Confirm requirements with your accountant or tax authority before relying on it for compliance.

What you get out of this checklist

Most rejected invoices are missing one boring field — a VAT number, a PO reference, a supply date. This audit catches them before the invoice goes out the door, not three weeks later when the client's AP team finally writes back.

5 regions

Region-aware rules

Switch between US, UK (HMRC VAT-registered), EU (Directive 2006/112/EC), Australia (ATO), Canada (CRA), or a generic profile. The required items shift to match.

Required vs nice-to-have

Stop padding, start passing

Every line is tagged required or recommended for the region you pick — so you know exactly what blocks payment versus what just looks more professional.

60 sec

From draft to defensible

Tick through the checklist once, copy the summary into your project notes, and you have an audit trail of what was on the invoice the day you sent it.

Why invoices get rejected — and what it actually costs

When an invoice comes back marked 'cannot process', it's almost never the work that's the problem. It's a missing field that the AP team is contractually unable to ignore.

  • Missing tax ID delays payment for weeks. If you're VAT-registered in the UK or EU and your VAT number isn't on the invoice, the client legally cannot reclaim the VAT — so they reject it and the clock restarts.
  • Wrong region rules = rejected invoice. An ATO tax invoice without the words 'Tax Invoice' is not a valid tax invoice. A UK VAT invoice without a VAT rate per line fails an HMRC audit. A US invoice with no sales tax line confuses procurement.
  • AP teams reject invoices for missing PO. Most enterprise accounts payable systems auto-reject any invoice without a matching purchase order number. No PO match, no payment — even if the work is fully delivered.
  • Penalties for non-compliant VAT invoices. In the EU and UK, issuing an invoice that doesn't meet the directive is a compliance issue for both parties. Repeated non-compliance can trigger fines and audit attention you really don't want.

Everything this invoice audit checks for you

Built around the actual fields that AP teams, tax authorities, and clients look at — not just a generic 'looks fine to me' review.

Identity block, both sides

Your name and address, your tax ID where required, your client's full legal name and billing address, and their VAT number when intra-community or reverse-charge rules kick in.

Document metadata

The right document label ('Invoice', 'VAT Invoice', or 'Tax Invoice'), a unique sequential invoice number, issue date, due date, and supply or service period when the regime requires it.

Line items that survive an audit

Clear descriptions, quantity, unit price, line total, and per-line tax rate where VAT or GST rules require it. Vague descriptions are the most common reason invoices get queried.

Totals and payment instructions

Subtotal, tax total, grand total, currency stated explicitly, accepted payment methods, and bank or payment link details. Missing payment instructions is a top reason invoices stall in approval queues.

How to audit an invoice in three steps

The same flow works whether you're checking a draft invoice you're about to send or auditing a template you reuse every month.

  1. Step 1

    Pick your region

    Choose US, UK (VAT-registered), EU, Australia, Canada, or generic. The required items rebuild to match the rules your client's tax authority actually enforces.

  2. Step 2

    Tick what's already on your invoice

    Work through the five groups — identity, document, line items, totals, payment. Each item is tagged required or recommended so you know what's load-bearing.

  3. Step 3

    Copy the summary or fix the gaps

    Copy the plain-text summary for your records, or jump back to the invoice generator and add the missing fields before you send.

Why an invoice requirements checklist matters

An invoice requirements checklist is the difference between an invoice that gets paid in 14 days and one that bounces around an accounts payable inbox for two months. The work was done. The amount is correct. But one missing field — a VAT number, a PO reference, the words "Tax Invoice" at the top — is enough for an automated AP system or a careful tax authority to push it back.

The cost is real. Around 85% of freelancers report being paid late at some point, and a meaningful share of those delays trace back to invoice elements that weren't on the document. Worse, in VAT and GST regimes a non-compliant invoice doesn't just slow payment — it stops the client from reclaiming the tax, which makes you the source of their problem.

This checklist gives you a region-aware audit before the invoice goes out. It covers what should be on an invoice in the US, UK, EU, Australia, and Canada, splits each item into required vs recommended for that regime, and produces a plain-text summary you can save with your project notes.

Region-by-region summary of invoice requirements

United States

There's no federal invoicing law in the US. State sales tax rules and the procurement policies of your client's accounts payable team are the binding constraints. A defensible US invoice includes your business name and address, your client's full legal name and billing address, a unique invoice number, issue and due dates, itemized line descriptions with quantity and rate, a subtotal, a separate sales tax line if you're collecting it, the grand total, and your payment instructions. Including your EIN is recommended for B2B work — many enterprise vendor portals require it before they cut a check.

United Kingdom (HMRC, VAT-registered)

HMRC requires a full VAT invoice for any taxable supply over £250, with simplified invoices allowed below that. The full invoice must show: a unique sequential number; your business name, address, and VAT registration number; the customer's name and address; the date of supply (tax point); the invoice date; a description of the goods or services; the VAT rate applied per line item (20% standard, 5% reduced, or 0%); the net, VAT, and gross totals; and the unit price for each line. If any items are at different VAT rates, that has to be clear on the invoice. These rules are the reason a UK VAT invoice has so many more fields than a US invoice for the same job.

European Union (Directive 2006/112/EC)

The EU's harmonised VAT invoicing rules sit in Council Directive 2006/112/EC, with content requirements in Article 226. A full EU VAT invoice must include the issue date, a sequential invoice number, your VAT identification number and the customer's VAT number where applicable, both parties' full names and addresses, the quantity and nature of the supply, the date of supply, the unit price, the VAT rate, the VAT amount per rate, and the total amount payable. Simplified invoices are permitted for amounts under €100 (with member state variations up to roughly €250), and the EU is moving to mandatory structured e-invoicing for B2B from 2028.

Australia (ATO)

If you're GST-registered and selling more than A$82.50 (GST inclusive), Australia's ATO requires you to issue a tax invoice when the customer asks. The invoice must show the words "Tax Invoice" prominently, your Australian Business Number (ABN), the issue date, a brief description of the items including quantity and price, and the GST amount payable — either on its own line or as the statement "Total price includes GST" if the GST is exactly 1/11 of the total. For sales of A$1,000 or more you also have to show the buyer's identity or ABN. The ATO requires you to keep tax invoice records for five years.

Canada (CRA)

The CRA scales documentation requirements with the invoice value. Under C$30 you only need the supplier name, date, and total. Between C$30 and C$150 you also need your GST/HST registration number and payment terms. Above C$150 the CRA requires the buyer's name, itemised descriptions, and the tax amount shown separately. Tax should always be displayed separately from the net price, and the GST or HST rate should match the customer's province (HST 13% Ontario, GST 5% Alberta, and so on). Records must be kept for six years from the end of the tax year.

What AP teams actually look for

Tax law is one filter. The accounts payable team is the other, and they reject more invoices than the tax authority ever will. From procurement guidance and freelance forums, the recurring pattern is the same: missing PO number, mismatched legal entity name, vague line descriptions ("services rendered"), no payment instructions, wrong currency, and inconsistent invoice numbering. None of those are illegal. All of them stop payment.

The fix is to treat the AP team as a co-author of the invoice format. Ask before the first invoice: do you require a PO number, what legal entity should I bill, where do I send the invoice, and what payment terms apply. The five minutes that conversation costs is the cheapest insurance you can buy against a 45-day delay.

Common reasons invoices get rejected

Across the search results and freelancer reports, the same handful of reasons keep coming back:

  • The invoice is missing the PO number or has the wrong one.
  • The supplier's tax ID (EIN, VAT number, ABN, GST number) is missing.
  • The client's legal name on the invoice doesn't match what's in their AP system.
  • Line descriptions are too vague to map to the contract or PO.
  • Sales tax, VAT, or GST is not shown as a separate line.
  • There's no due date, or the terms aren't clear.
  • The currency isn't stated and a "$" symbol is ambiguous.
  • The bank details or payment link aren't on the invoice.

The audit checklist above maps directly to that list. If every required item for your region is checked, you've removed the most common reasons an invoice gets sent back.

The difference between an invoice and a tax invoice

An "invoice" is a generic commercial document — a request for payment with enough detail that both parties agree what's owed. A "tax invoice" or "VAT invoice" is a regulated document that triggers the buyer's right to reclaim input tax. The difference matters because tax invoices have mandatory fields, mandatory wording (the literal phrase "Tax Invoice" in Australia, for example), and statutory retention periods. Issue a regular invoice when you should have issued a tax invoice and you've created a problem your client can't fix without your help.

If you're VAT-registered in the UK or EU, GST-registered in Australia, or GST/HST-registered in Canada, default to issuing tax invoices for every business sale. The checklist above defaults to tax-invoice rules whenever you select one of those regions, so you don't have to remember which fields move from optional to required.

Frequently asked questions

What is legally required on an invoice?
It depends on your country and tax status. In the US there's no federal invoicing law — you need clear identity, an invoice number, dates, line items, totals, and payment terms. In the UK, EU, Australia, and Canada, if you're registered for VAT or GST you must add your tax registration number, the tax rate (per line in the UK and EU), and the tax total. Pick your region in the checklist above to see the exact required fields.
Is a US invoice the same as a tax invoice?
No. In the US, an 'invoice' is a generic billing document and there's no statutory format. In Australia, the UK, and the EU, a 'tax invoice' or 'VAT invoice' is a specific document with mandatory fields that lets the buyer reclaim input VAT or GST. If you're billing an Australian or UK client and you're tax-registered, you need to issue a tax invoice, not just a regular invoice.
What is a VAT invoice?
A VAT invoice is the document a VAT-registered business issues for taxable supplies. In the UK, a full VAT invoice must include a unique number, your VAT registration number, the date of supply, the customer's name and address, a description of the goods or services, the VAT rate per line, and the net, VAT, and gross totals. The EU equivalent is set out in Article 226 of Council Directive 2006/112/EC.
Do I need a PO number on my invoice?
Only if your client uses purchase orders — but if they do, you absolutely need it. Most enterprise accounts payable systems do an automatic three-way match between PO, goods receipt, and invoice. No matching PO means the invoice is rejected before a human ever sees it. Always ask for the PO number before you start the work, not after.
What happens if my invoice is missing required information?
Best case: the client's AP team sends it back and asks you to reissue, costing you days or weeks. Worst case: in VAT or GST regimes, the client cannot reclaim the tax and the invoice fails a tax audit, exposing both sides to penalties. The checklist above flags every required field for your region so this doesn't happen.
Do I need to put my address on an invoice?
Yes, in almost every region. AP teams use it to verify you're a real vendor, and tax authorities use it to confirm the supplier is who you say you are. A PO box alone is often refused — use a real street address (your registered business address or home address if you're a sole proprietor).
Do I need an invoice number if I'm a freelancer?
Yes. Every invoice should have a unique, sequential invoice number with no gaps. AP teams use the number to spot duplicates, and tax authorities expect it for reconciliation. A simple format like 2026-001, 2026-002 works fine — what matters is that no two invoices share the same number.
How long do I need to keep invoices?
It varies. The US IRS expects three years generally, six or seven in some cases. UK HMRC requires VAT invoices for six years. EU member states typically require ten years. Australia's ATO requires five years, and Canada's CRA requires six years from the end of the tax year. Save a copy of every invoice and the checklist summary alongside it.

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