For the monthly base service, the fee is $10,000 per billing month.
A complete worked review · fictional data
Follow the terms.
Check the charge.
An effective amendment, a billed line, a service quantity and a question still to resolve. Inspect what the comparison has done—and the record your team needs next.
Worked example · fictional data
TT / 01Harbor Offices · August 2026
The billing review.
One billing period
Total invoiced$11,000
Contract basis$11,300
Possible difference$300Before credit review
Reviewed itemContract basisInvoice
Monthly base Review rateAmendment 1 §2 · effective Aug 1
$10,300$10,000Additional visits Matches4 visits × $250 · Schedule A §1
$1,000$1,000Why the base rate needs review
Governing source / Amendment 1 §2
Effective August 1, 2026, the monthly base service fee in Section 2 changes to $10,300. The remaining provisions continue unchanged.
$10,300 expected − $10,000 billed = $300 to review
Before changing the invoiceCheck separate credits & adjustments.
Follow the clause and calculation
A billing difference to review, not recovered cash.
Inspect the source documents
Service contract §2 · original monthly base
For the monthly base service, the fee is $10,000 per billing month.
Amendment 1 §2 · revised monthly base
Effective August 1, 2026, the monthly base service fee in Section 2 changes to $10,300. The remaining provisions continue unchanged.
Schedule A §1 · additional visits
Additional visits requested outside the monthly base service are billed at $250 per completed visit.
August invoice and service record · illustrative
Monthly base service: $10,000. Four completed additional visits: 4 × $250 = $1,000. Total invoiced: $11,000. Credits and adjustments require separate review.
The governing document chain
The changed rate is one part of the review.
Effective August 1, 2026, the monthly base service fee in Section 2 changes to $10,300. The remaining provisions continue unchanged.
Additional visits requested outside the monthly base service are billed at $250 per completed visit.
Monthly base service: $10,000. Four completed additional visits: 4 × $250 = $1,000. Total invoiced: $11,000. Credits and adjustments require separate review.
Different outcomes, equally useful
A difference. A match. A question.
| Reviewed item | Billed and expected | What we found |
|---|---|---|
| Monthly cleaning base · Amendment 1 §2 | billed $10,000 · expected $10,300 | $300 to review; check credits |
| 4 additional visits · Schedule A §1 | billed $1,000 · expected $1,000 | matches |
| Both items | billed $11,000 · expected $11,300 | $300 to review before correcting |
Harbor Offices · check before correcting
The base charge is $300 under the amended rate.
Amendment 1 changes the monthly base to $10,300 from August 1. The invoice bills $10,000: $10,300 − $10,000 = $300 to review. Check whether a separate credit or adjustment explains the difference before changing the invoice.
- Contract
- Harbor Offices cleaning agreement, Amendment 1 §2
- Invoice period
- August 1–31, 2026
- Amendment effective
- August 1, 2026
- Still to check
- any agreed credit or adjustment for August
Source extract
Harbor Offices · Amendment 1 §2 and August invoice
For the monthly base service, the fee is $10,000 per billing month. Effective August 1, 2026, the monthly base service fee in Section 2 changes to $10,300. The remaining provisions continue unchanged. Additional visits requested outside the monthly base service are billed at $250 per completed visit. Monthly base service: $10,000. Four completed additional visits: 4 × $250 = $1,000. Total invoiced: $11,000. Credits and adjustments require separate review.
Meadow Studios · a separate comparison
Three visits at $225 match the $675 billed.
In the Meadow Studios comparison, the service log records three additional visits in August; that contract's Schedule A prices them at $225 each; the invoice bills $675. Nothing to correct.
- Contract
- Meadow Studios cleaning agreement, Schedule A §1
- Service record
- three additional visits in August 2026
- Compared
- quantity and rate for this line only
Source extract
Meadow Studios cleaning agreement, Schedule A §1, August service log and invoice line
Schedule A §1: additional cleaning visits cost $225 each. August log: three additional visits, August 5, 12 and 19. Invoice: three additional visits, $675.
Pine Court Offices · missing document
Amendment 2 is needed before the August price can be checked.
In the Pine Court Offices comparison, the August service schedule refers to pricing set in Amendment 2, which wasn't in the documents. The comparison leaves that amount unresolved rather than guessing.
- Contract
- Pine Court Offices cleaning agreement
- Reviewed period
- August 2026
- Missing
- Amendment 2
- Left open
- the price and scope for August
Source extract
Pine Court Offices cleaning agreement, August service schedule
August service schedule: "Pricing and scope for this period are subject to Amendment 2."
What this sample covers
The two listed Harbor invoice items, the base-rate amendment and the visit quantity. Credits or adjustments need separate checking. This teaching example is not a customer finding or a prediction of financial return.
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