Comparison method
Invoice doesn't match the quote: how to compare them properly
Documents can look different without the price changing. Work through the accepted version, the whole-job totals, then the line detail, credits and tax separately.
QuoteTrace guide · Updated September 2026
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Start with the overall price
Compare the whole-job total on the accepted quote with the whole-job total on the invoice, before looking at any line item. Do not compare against a balance due, a progress claim or a partial payment request: those show what is payable now, not what the job costs in total. If the two whole-job totals are the same, the overall price has not changed, even where the wording differs.
What to check next
Check 1
Confirm which quote version you accepted
Suppliers often issue revised quotes. Identify the version you signed, emailed your approval to, or paid a deposit against, including its date and reference. Comparing the invoice against an earlier or superseded version produces differences that are not real.
Check 2
Match renamed and bundled items
The same work is frequently described differently on an invoice, or several quoted lines are combined into one bundled amount. Line up the descriptions by the work performed rather than the words used. When one document bundles a price, the documents cannot show how much each task contributed, so ask for an itemised breakdown instead of assuming a new charge.
Check 3
Separate rate changes from quantity changes
A familiar line can cost more for two very different reasons: the unit rate or hourly rate went up, or the quantity, hours or square metres went up. Check both numbers, not just the line total, because the explanation you need from the supplier depends on which one changed.
Check 4
Check credits, deposits and allowances
Deposits, discounts, rebates and trade credits should appear on the final account. A provisional allowance may also have been replaced by the actual cost. A missing credit can make an invoice look higher even when the work price never changed.
Check 5
Treat tax as its own comparison
Compare the amounts before tax first, then check the tax line separately. If the before-tax amount rose, tax normally rises with it. That expected movement is not a second unexplained charge and should not be counted twice.
A quick way to lay it out
- Accepted quote version and date, with its whole-job total before tax.
- Invoice whole-job total before tax, ignoring balance due and progress claims.
- Difference before tax, then the tax line compared on its own.
- A short list of lines that appear renamed, bundled, re-rated or re-quantified.
- Any deposit, discount or credit and where it appears on the invoice.
Questions to ask before paying
- Which version of the quote is this invoice based on, and can you send me that version?
- Is this invoice for the whole job, or is it a progress claim or balance due?
- Do these differently worded lines refer to the same work?
- Can you provide an itemised breakdown of this bundled amount?
- Did the rate change, the quantity change, or both?
- Where has my deposit, discount or agreed credit been applied?
- How was the tax on this invoice calculated?
Common questions
The wording is different but the total is the same. Is that a problem?
The overall price has not changed. Different wording can still be worth clarifying, because it may show the work performed was not exactly what was agreed, but it is a scope question rather than a price increase.
Should I compare the invoice against the balance due?
No. Compare whole-job totals. A balance due already deducts deposits or earlier progress payments, which makes the numbers look mismatched when the job price is unchanged.
Does QuoteTrace decide whether a charge is valid?
No. QuoteTrace identifies differences between the two documents you upload and suggests factual questions to ask. It does not provide legal, accounting or financial advice.
Related: Final invoice higher than the quote: what to check before paying
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