How to Review VAT-Exclusive Fees and a Withholding-Tax Gross-Up

Otis, Ops at a 32-person UK B2B payments firm, is about to treat “Fees exclusive of VAT” as the all-in number. Finance missed the hidden risk. Knowing how to review vat-exclusive fees and a withholding-tax gross-up is a 25-minute hunt: exclusive or inclusive on the fee line, a valid VAT invoice before they add tax, gross-up is not VAT, who accounts, then clarify, cap, or walk.

September 2026. English law; exclusive courts of England and Wales. The packet — the exact file set that will be signed — is the MSA (master services agreement, the frame vendors hang order forms on) plus the order form and a billing exhibit (attached schedule). Annual Fees: £48,000. Fees exclusive of VAT. Clause 12: pay all Taxes including VAT and gross-up withholding so Vendor receives the full amount. Delaware sample: “UK VAT 20%,” no GB VAT number. Signature is Friday.

VAT-exclusive is a 20% add-on when UK VAT is actually due. A withholding gross-up compounds. Reverse charge is not optional even if they invoice UK VAT. GOV.UK VAT rates (live 21 September 2026): UK standard rate 20%. Charging VAT: exclusive × 1.2 (£60 → £72). VAT Notice 741A §5.16: if reverse charge applies and they still issue a UK VAT invoice, you must still reverse-charge.

Disclaimer: Checkory provides AI support, not legal advice. Consult a qualified lawyer for binding decisions.

How do exclusive versus inclusive fees show up on the order form?

Exclusive means VAT, if it is due, sits on top of the fee. Inclusive is the all-in. Circle “Fees exclusive of VAT” next to £48,000. Write an all-in only if UK VAT is actually due. If reverse charge applies, you account; you do not also pay 20% to Delaware.

Do: put exclusive or inclusive on the same line as the fee. Don’t: treat the MSA Taxes heading as the price. Sprintlaw: say whether fees are exclusive of VAT. GOV.UK colour if UK VAT is actually due: £48,000 × 1.2 = £57,600 at the live 20% standard rate — not a promise this US vendor must charge it. If the fee line is silent, do not assume exclusive. Demand the words.

Should you pay VAT before they send a valid invoice?

Pay vendor-charged VAT only against a valid VAT invoice. A Delaware PDF labelled “UK VAT 20%” with no GB VAT number is not that invoice. You cannot reclaim VAT on an invalid invoice or a pro-forma.

Do: condition any vendor VAT on a valid VAT invoice. Don’t: let Finance reclaim a labelled “VAT” line that is not input tax. VAT Notice 700/21 §4.1 wants a supplier VAT number, exclusive amounts, and VAT in sterling. VAT Regulations 1995 r.14 adds a “reverse charge” legend where the customer is liable. GOV.UK: invalid / pro-forma / statement / delivery note → no reclaim. Otis’s MSA dropped the Valid Invoice floor.

Why does a withholding-tax gross-up not equal VAT?

VAT is a consumption tax on a supply. Withholding tax is an income-tax deduction at source. A gross-up tops up the payor so the payee still receives the contractual amount after withholding. Clause 12 mixes them into “all Taxes including VAT.”

Do: carve VAT/GST out of the gross-up; limit it to lawful withholding; cap it; require treaty forms. Don’t: invent Otis’s WHT rate. For example, Wikipedia’s formula is amount ÷ (1 − rate); a 35% illustration on $10,000 is $15,384.62 — not this SaaS. HMRC INTM522030 (loan colour): gross-up plus withhold can mean you pay the tax twice until the payee claims treaty relief. Law Insider samples split exclusive VAT after a proper invoice from deduct-and-certificate versus gross-up. A US vendor is not a reason to gross-up VAT.

Who accounts under reverse charge and place of supply?

For B2B general-rule services, place of supply is where the customer belongs. If Notice 741A section 5 bites, Otis accounts to HMRC even if Delaware invoices UK VAT. Reverse charge is not optional. Do not also pay the fake VAT line.

Do: name who accounts and match the invoice legend. Don’t: treat a US “UK VAT” line as settling the UK return. VATA 1994 s.8 sits behind Notice 741A: B2B general rule is where the customer belongs; a USA customised-software example has the UK customer reverse-charge; the amount payable to the overseas supplier excludes UK VAT. If they still issue a UK VAT invoice, reverse-charge anyway. Land, events, and hire are other rules.

Is this the Net 30 payment-timing hunt?

Finance said this is just Net 30. Finance is looking at the calendar. This hunt is the tax number after exclusive, invoice, gross-up, and who accounts. If the fight is when the clock starts, withhold, or pause, that packet belongs on a different page.

Do: stay on tax mechanics. Don’t: spend counsel — a qualified lawyer, not the chatbot — on invoice-date versus acceptance while clause 12 is unsigned. If the fight is when the clock starts, withhold, or pause, that is how to review payment terms and Net 30. If Finance wants to short-pay a disputed line, that is set-off versus no-set-off. Neither page is exclusive versus inclusive, a valid VAT invoice, a WHT gross-up, or reverse charge.

When to clarify, cap the gross-up, or walk

Clarify only if exclusive or inclusive is on the fee, a valid-invoice or reverse-charge path exists (not both), VAT is carved out of the gross-up, a WHT cap plus treaty docs is in, and who accounts is named. Walk the exclusive + uncapped all-Taxes + fake UK VAT + reverse-charge silence package.

Success bar: a one-page log plus one Friday sentence that would change cash. Workflow: exclusive vs inclusive → valid VAT invoice before they add tax → gross-up ≠ VAT → who accounts (reverse charge) → not Net 30 → clarify / cap gross-up / walk. In practice, open the fee line, clause 12, and the sample invoice before you sign. Optional: upload the same PDF to document analysis for a first-pass — a machine extract of clauses before a human reads every page — then a named human still opens the fee line. Verify every High flag — a severity-high finding a named human still opens. Do not mark this paper ready to sign.