Your ad bill and your card payment answer different questions
A payment can settle last month's balance. A credit can change a cost already reported net. Reconcile the statement before deciding a fee is unexplained.
TL;DR
- Compare costs for a stated period separately from payments made during it. A card charge can settle costs from another period.
- Reconcile opening balance, charges, credits and payments to the closing balance using the statement's own definitions.
- Add agency and other relevant fees once. Do not subtract a credit again if the reported cost already includes it.
- An unexplained difference needs evidence. The invented example below explains a $100 gap without assuming an extra fee or a billing error.
The agency report lists one spend total. Your card statement shows another. Before challenging either, establish what each number measures: advertising delivered, the amount invoiced, or cash collected.
A reconciliation should connect those records. It should also leave a genuinely unmatched amount open for investigation instead of forcing the numbers to agree.
Pick the account, period and billing method
Write the advertising account identifier, currency and dates covered by the cost report. Then record the dates covered by the payment statement. If they differ, preserve both ranges.
Google's Billing Summary documentation distinguishes amounts owed under automatic payments from funds available under manual payments. Its separate transactions guide applies to monthly invoicing accounts. Start with the instructions for your actual billing method; do not look for a screen that belongs to another arrangement.
For an agency that pays the platform and rebills you, obtain the relevant platform statement and the contract's explanation of fees or markups. A single invoice line labeled advertising does not establish which underlying amounts it contains.
The agency-quote comparison gives questions to ask about fee and media scope before signing. Reconciliation checks what the resulting bill actually represents.
Work through an amount-owed example
All amounts below are invented. This is an original postpay example in which a positive balance means money owed. It is not a screenshot or a claim about a particular advertiser.
| Account movement | Amount | Meaning in this example |
|---|---|---|
| Opening balance owed | $400 | Unpaid amount at the start |
| Campaign charges | +$2,400 | Gross charges for the specified period |
| Credits | −$100 | Credits applied in this simplified period |
| Payments to the platform | −$2,200 | Cash that reduced the amount owed |
| Closing balance owed | $500 | Unpaid amount at the end |
The check is $400 + $2,400 − $100 − $2,200 = $500. Net media cost for this example is $2,300. The $2,200 payment is $100 lower because the amount still owed increased by $100.
Now add an agency fee of $800, both incurred and paid in the same period. The defined marketing cost is $3,100: $2,300 net media cost plus $800 agency fee. Cash paid is $3,000: $2,200 to the platform plus $800 to the agency.
The difference is still $100, explained by the change in the platform balance. It is not automatically an unexplained management charge.
This example has no taxes or other adjustments. If your statement includes them, add their actual lines and determine whether the chosen net-cost figure already includes them. A manual-payment account needs its funds-available reconciliation rather than this amount-owed sign convention.
Trace credits before subtracting them
A credit may be posted in one period while referring to service in another. Keep the posting date, related service period where given and original reference. Decide which comparison you are preparing instead of moving the amount silently to make a month look better.
Also check the report label. If a $2,300 net-cost figure already reflects the $100 credit, subtracting the credit again would understate cost at $2,200. That would accidentally make it equal the cash payment in this example and hide the real balance movement.
Preserve the original documents and show a separate adjustment when aligning periods. Do not edit a source export to erase the distinction. Google's billing guides describe cost, payment and adjustment views; your reconciliation should identify which one supplied each entry.
Add the costs the ad platform cannot show
Media is one part of the marketing bill. Management, setup, landing pages, call tools or other contracted items may sit on separate statements. Include only those that actually apply, and state whether your comparison covers all marketing or a narrower campaign.
| Local reference | Cost period | Payment date | Cost category | Included in another line? | Amount to investigate |
|---|---|---|---|---|---|
| Your invoice or statement ref | Dates the charge relates to | Actual or expected cash date | Media, fee or other defined item | Yes, No or Unknown | Keep unresolved amount visible |
A combined agency invoice can contain both media and management. Adding its full total to the platform cost would count media twice. Equally, treating the agency payment as management only could miss a media component. Verify the breakdown rather than infer it from the payee's name.
Keep purchases or costs unrelated to the reviewed campaign out of that campaign comparison, while retaining them in the business's full records. The purpose is a traceable scope, not a conveniently low cost per lead.
Turn the remaining difference into a specific question
An effective query names the reference and the missing connection: which platform account and dates does this media line cover? Is this amount before or after the credit? Does this invoice include the management fee already shown elsewhere?
Ask for a revised breakdown when necessary. A mismatch alone does not establish fraud, and a balancing total does not prove the contract was followed. You still need the agreed scope, actual statement and supporting service records.
When the cost view is reconciled, use payment dates for the separate cash-flow check. A monthly cost can be affordable overall and still fall due before customer receipts.
What this doesn't cover
This is a simplified operational reconciliation, not accounting, tax or legal advice. It does not establish your expense-recognition policy, audit an agency or prove that all charges are authorized. Real statements can include tax, currency differences, refunds, adjustments and billing methods absent from the example. Keep unresolved fields unknown until checked with the responsible provider or bookkeeper.
Questions owners ask
Is the card statement the best measure of monthly ad performance?
It measures payments. Use the matching cost period and campaign records for a defined performance comparison, and reconcile how those costs connect to cash paid.
Should a credit reduce this month's campaign cost?
First establish what period it relates to and whether your reported cost already includes it. Keep posting-date and service-period views explicit. Your bookkeeper can determine the treatment required in your accounts.
What if the agency cannot supply the platform statement?
Record that evidence gap and ask what supports the media line. Do not manufacture a platform total from the invoice or assume the missing statement means zero spend.
Sources and method
- Google Ads: About the Billing Summary page, read October 16, 2026, supports the billing-method and balance distinctions. The English UK help page was read; no live advertiser account was audited.
- Google Ads: View your transactions, read October 16, 2026, describes the monthly-invoicing transactions view and adjustment details.
- The ledger and amounts are original invented teaching examples with no client data.
Lonta AI provides managed advertising. We want the fee, media scope and evidence behind a cost comparison visible to the owner. Discuss your reporting requirements, or use this reconciliation with your existing provider before changing the budget.