How to Check a Trade Job Has Been Fully Invoiced

Before closing a trade job, compare its final agreed value with the valid invoices you have raised. If those figures do not match, there may be approved work that has not yet been billed, a credit that has been missed or an invoice still sitting in draft.

This is different from checking whether the customer has paid. A customer can owe money on an invoice while you also have additional work that has never been invoiced at all. Both affect your cash, but they require different action.

What does fully invoiced actually mean?

A job is fully invoiced when every part of the final agreed customer value has been included on a valid invoice. That value may be different from the amount on the original quote because the job can change once work begins.

The basic calculation is:

Final agreed job value = original accepted quote + approved additions − agreed omissions or credits

You can then calculate:

Remaining amount to invoice = final agreed job value − valid invoices raised

Use figures on the same basis throughout. If you are VAT registered, do not compare a VAT-inclusive customer quote with net invoice values. Compare gross with gross, or net with net.

Draft, declined or merely discussed extras should not automatically be included in the agreed value. Equally, a cancelled invoice should not be treated as though it still bills the customer.

Unbilled work and unpaid invoices are not the same thing

These two commercial problems are often mixed together:

• Unbilled work is agreed work that has not appeared on a valid invoice.
• Unpaid work has been invoiced, but the customer has not yet paid some or all of it.

That creates two separate calculations:

Looking only at the bank account will not reveal unbilled work. No payment can arrive for an invoice that was never raised.

A worked example of a missed variation

An electrician agrees a domestic installation for £4,800. During the job, the customer asks for several changes:

• One additional socket: £180
• A fitting to be moved after first fix: £320
• An extra visit caused by a late customer decision: £240
• An omitted light fitting credited back: £150

Assume these figures are all on the same VAT basis. The final agreed value is:

The business has already issued invoices for £1,440, £2,400 and £1,310. Total invoices raised are £5,150.

£5,390 agreed value − £5,150 invoiced = £240 left to invoice

The forgotten £240 is the extra visit. It may have felt like a small request at the time, but it still used labour, travelling time and a diary slot.

Now suppose the customer has paid £3,840. That does not mean the unbilled amount is £1,550. Of the £1,550 gap between agreed value and cash received, £1,310 has already been invoiced and is awaiting payment. Only £240 remains unbilled.

Why trade jobs finish with money missing

Site requests stay in conversations

A customer asks while you are working, or sends a quick message in the evening. You agree to look at it, complete the work and intend to add it later. By the time the final invoice is prepared, the request is buried under dozens of other messages.

The original quote is treated as the final invoice total

The original quote remains an important baseline, but it stops being the whole commercial picture when the agreed scope changes. Simply invoicing the original amount can leave every later addition behind.

Only materials are considered

An extra fitting might cost £40, but the customer request may also require collection time, installation labour, another visit, waste disposal or subcontractor time. Recovering the material cost alone does not recover the full commercial impact.

Omissions and additions are handled separately

A customer may remove one item and add another. If the omitted work is credited informally but the addition is never recorded, the final figure can become guesswork. Both movements should appear in the reconciliation.

The final invoice is created before the job is reviewed

Preparing a final invoice directly from memory encourages omissions. The commercial review should come first: baseline quote, approved changes, credits, invoices and then payments.

Keep a simple variation and decision record

You do not need to turn every job into a paperwork exercise. You do need enough information to show what changed and what should happen commercially.

For each possible change, record:

• the date of the request;
• what the customer asked to change;
• whether it is genuinely outside the original scope;
• the additional price or credit;
• any effect on timing or scheduled visits;
• whether the customer approved, declined or has not decided;
• where the approval is recorded;
• whether it has been invoiced.

A short written description is better than relying on a line such as extra work. For example, add and test one double socket to the agreed location is much clearer about the deliverable.

Written approval is particularly useful because agreement to the work is not always agreement to an unknown price. Wherever practical, confirm the scope and price before carrying out the change. Your contract terms and the circumstances of the job may also affect how changes should be handled, so seek appropriate professional advice where a dispute or significant contractual issue arises.

A practical job reconciliation process

1. Start with the accepted commercial baseline

Find the accepted quote or agreed contract value. Do not start with the amount received into the bank, because deposits and interim payments tell you about cash rather than the full value of the work.

2. Review every requested change

Check site notes, messages, emails, diary entries and conversations recorded against the project. Give each request a clear status: approved, declined, pending or included within the original scope.

Do not bill a request simply because it was discussed. The reconciliation should identify approved value, not turn every conversation into a charge.

3. Add approved extras and subtract agreed credits

Build the final agreed value from the original quote. Include separately approved additions and any agreed reductions for omitted work.

If you use daywork, check the agreed labour records, materials and any applicable terms before calculating the addition. Avoid inventing a total at the end of the project that the customer has never seen.

4. Check which invoices remain valid

List deposits, staged invoices, interim invoices, variation invoices and the final invoice. Separate valid invoices from drafts and cancelled documents.

A draft waiting to be sent is still an action to complete. A cancelled invoice should remain in the financial history, but it should not be counted as money currently billed to the customer.

5. Calculate the remaining amount to invoice

Subtract valid invoices raised from the final agreed job value. Investigate any difference rather than assuming it is correct.

• A positive figure can indicate work still to invoice.
• A zero figure suggests the agreed value has been fully billed.
• A negative figure can indicate overbilling, a missing credit, duplicate invoicing or inconsistent VAT treatment.

6. Reconcile customer payments separately

Once the invoice total is correct, compare valid invoices with payments received. This shows the debtor position: what has been billed but not yet paid.

7. Review the job costs and margin

Being fully invoiced does not necessarily mean the job was profitable. Make sure additional materials, labour-related costs, subcontractors and other direct spending are connected to the same project. You can then compare what the completed job earned with what it actually cost.

When should the reconciliation happen?

Do not wait until months after completion. Useful checkpoints include:

• before each stage or interim invoice;
• after a significant change to the scope;
• before the final scheduled visit;
• before issuing the final invoice;
• before marking the job commercially complete.

For a longer building or landscaping project, a weekly review can prevent several weeks of changes accumulating. For shorter domestic jobs, a five-minute check before the final invoice may be enough.

A pre-close checklist for trade jobs

• Has every site request been given a status?
• Are approved additions recorded with a price?
• Have omissions and customer credits been included?
• Are quote and invoice values compared on the same VAT basis?
• Have all valid staged and separate invoices been counted?
• Is any invoice still sitting in draft?
• Have cancelled invoices been excluded from the amount billed?
• Does the agreed job value equal the total invoiced?
• Have customer payments been reconciled separately?
• Are materials, subcontractors and other direct costs attached to the job?

Keeping the commercial trail with the project

Tools2Done connects the original project with its quotes, variations, invoices, project expenses, customer payments and profitability information. If the scope changes, you can prepare an additional quote linked to the same project rather than overwriting the original agreement. The customer can receive an online quote link to accept or decline.

Variations and other extra work can also be invoiced separately from the original payment schedule. The project financial view brings together quoted value, amount invoiced, project spend, payments received and the remaining amount to invoice.

This does not replace the need to decide whether a request is chargeable or what price is fair. It gives that decision a connected commercial record, making it easier to find before the job is closed.

The useful next step

Take one recently completed job and perform the calculation manually: original accepted value, approved additions, agreed credits, valid invoices and payments. If those records are spread across messages, notebooks and separate files, create a standard close-out checklist for every future project.

The aim is not to charge for every minor conversation. It is to make deliberate decisions about changed work, record what was agreed and make sure the final invoice reflects the job that was actually delivered.