VAT bill due before your client pays? A consultant’s cash-flow action plan

Why VAT can fall due before your client pays

If your VAT calculation includes a consultancy invoice that is still unpaid, ask your accountant to explain why it belongs in that return. The question to resolve is whether your accounting method uses the relevant invoice or supply timing, or payment timing, for that transaction. Do not assume the client’s eventual payment date determines your VAT position.

Keep an unpaid invoice separate from a genuinely cancelled supply. If you delivered the agreed work and are still seeking payment, describe it as an unpaid debt when discussing it with your adviser. Do not cancel and reissue the invoice simply to try to move the VAT. If the work was actually cancelled, the price changed or the client disputes the supply, explain what happened and ask what documentation and VAT treatment are appropriate.

Check your VAT accounting method and payment deadline

Open your VAT records and HMRC account alongside the outstanding invoice. Ask your accountant or bookkeeper to confirm the accounting method actually being used, rather than relying on how your invoicing software labels a report. VAT-registered businesses must keep VAT records; use those records as the starting point for the conversation.

Confirm the payment deadline and payment-method instructions against current GOV.UK guidance and your account. The research supplied for this article does not establish the ordinary VAT payment deadline or detailed accounting-method rules, so no universal deadline is given here. Put your verified payment date in the cash plan and check what you need to do for the money to arrive on time.

• Which VAT period and payment does this cash gap concern?
• Has the unpaid invoice been included correctly?
• Is the amount payable final or still an estimate?
• What payment instructions and timing apply to this business?

Calculate the shortfall using confirmed receipts and essential outgoings

Build a dated cash plan from today to the verified payment deadline. Start with available bank cash, including any VAT reserve only once. Add receipts with a specific, confirmed payment date, then deduct essential outgoings due before the VAT payment. Compare what remains with the verified VAT amount.

Keep unsigned proposals, potential extensions and vague promises out of the confirmed-receipts column. For the large unpaid invoice, run a fallback that excludes it even if the client has promised payment. Review any negative balance along the way, not just the closing figure: you need a workable sequence of payments as well as a workable total.

1. 1List available cash and identify any amounts already committed.
2. 2Record expected receipts by date, with the evidence behind each expectation.
3. 3List essential outgoings, including delivery costs and existing commitments.
4. 4Calculate the cash available for VAT and the remaining gap.
5. 5Repeat the calculation without the delayed client receipt.
6. 6Identify discretionary spending to pause and contact suppliers about any proposed changes before relying on them.

Ask for a part-payment without losing track of the balance

Contact the person who can confirm the client’s payment arrangements, not just your project sponsor. Ask whether the invoice is approved, whether anything is blocking it and what payment date they can commit to. If full settlement is not possible soon enough, request a specific part-payment and a date for the remainder.

Keep the request tied to the original invoice reference. Once money arrives, record the amount received and reconcile the outstanding balance before sending another reminder. Make clear in the written agreement that you are discussing staged payment, not offering a discount or accepting a smaller amount as full settlement.

• Suggested wording: “Could you arrange a part-payment of [amount] against invoice [reference] by [date], with the remaining [balance] paid by [date]? This request is for staged payment of the existing invoice, not a reduction in the total. Please confirm whether those dates are achievable.”
• If there is a dispute, ask the client to identify the disputed work and amount in writing, then discuss the appropriate next step with your adviser.

Cannot pay HMRC on time? Explore support before the deadline

If the fallback plan shows a shortfall, check current GOV.UK guidance on difficulties paying tax and contact HMRC before the deadline. Ask whether a payment arrangement, sometimes described as Time to Pay, could be considered for your circumstances. Do not treat support as an automatic entitlement or build your plan around an arrangement that has not been agreed.

Prepare the amount due, the cash you can offer, your essential outgoings and a realistic schedule based on expected receipts. Ask HMRC or your adviser about the applicable process, interest, penalties and your filing obligations. The supplied research does not establish current support criteria or terms, so verify those directly and retain a written record of any agreement.

Could the VAT Cash Accounting Scheme help with future invoices?

Put the VAT Cash Accounting Scheme on your adviser’s review list if delayed client payments repeatedly leave you short. Ask whether it would allow you to account for VAT on eligible sales when payment arrives, and how it would affect the timing of VAT recovery on your purchases. Compare both sides using your actual consulting receipts and supplier payments.

Check eligibility against current GOV.UK guidance, including the relevant turnover limits, conditions, exclusions and joining or leaving rules. The supplied research does not establish those details, so no eligibility threshold is quoted here. Ask specifically about existing unpaid invoices and transition treatment; do not assume changing methods will remove VAT already due.

• Bring a list of unpaid invoices and typical client payment patterns.
• Include subcontractor bills and other significant purchases in the comparison.
• Ask when any suitable change could take effect and how to avoid omissions or double counting.

Build a VAT reserve into your weekly cash-flow routine

Set a weekly appointment to review receipts, unpaid invoices, essential spending and the next estimated VAT payment. Agree a reserve approach with your accountant that reflects your actual VAT position rather than choosing an arbitrary percentage of turnover. Consider keeping the reserve separately identifiable so it is not mistaken for spare delivery cash.

Use the same review to act on slow-paying consultancy work. Confirm invoice receipt, resolve missing purchase-order details and chase specific payment commitments. For future engagements, discuss deposits or milestone billing before agreeing terms, and check their VAT treatment with your adviser. A reserve and clearer payment arrangements are planning tools, not substitutes for checking the liability.

How Invoices and payments helps

HappyNoodle’s Invoices and payments workflow lets you create invoices from the work, make payment simple and keep polite reminders connected to the right client. Use that workflow to support the collection side of this plan: issue the invoice, follow up with the relevant client and keep requests focused on payment. Alongside it, reconcile any part-payment in your accounting records before chasing the remainder. Keep VAT calculations, scheme decisions and any HMRC arrangement with your accountant and the relevant official guidance.