Amazon USA Marketplace Reconciliation Using OMS

Amazon USA sellers often need to reconcile OMS records with Amazon-side reports across orders, settlements, returns, reimbursements, and bank deposits. Cointab helps finance teams turn that work into a structured workflow: upload the files, map the fields, run reconciliation, review exceptions, and export audit-ready reports.

Why Amazon USA reconciliation becomes complex

Amazon marketplace reconciliation usually involves multiple reports that do not all speak the same language. Internal OMS data may show what was ordered, shipped, or billed, while Amazon reports may show settlement values, fees, deductions, refunds, and reimbursements.

Common challenges include:

• Orders appearing in one report but not in another
• Amount differences caused by fees, returns, or deductions
• Multiple files that need to be reviewed together
• Late or missing reports from the marketplace or internal systems
• Spreadsheet-heavy review that becomes hard to audit and reuse

When this process is handled manually, teams often spend time repeating the same matching work every period.

How Cointab handles Amazon USA marketplace reconciliation

Cointab uses a Side A and Side B model to compare your internal records with Amazon-side records.

Side A: your OMS or internal records

Side A can include records from your order management system or other internal source-of-truth files, such as:

• Order report
• Sales report
• SKU master
• Internal settlement working
• Bank statement or books data, where relevant

Side B: Amazon records

Side B can include Amazon reports such as:

• Amazon order report
• MTR report
• Disbursement report
• FBA return report
• Reimbursement report
• Any other Amazon-side export used in the reconciliation workflow

Typical workflow

1. Upload the required files for Side A and Side B.
2. Map key fields such as date, amount, and identifiers.
3. Optionally upload supporting data for lookups, enrichment, or calculation.
4. Create derived columns when a field needs to be cleaned, combined, or calculated.
5. Run reconciliation manually or on a schedule.
6. Review matched, partially matched, unmatched, and skipped records.
7. Download the Excel reconciliation report for review, follow-up, or audit work.

If a file does not match the configured format, the system can reject it with a clear error so the workflow stays controlled and transparent.

Reports and data commonly used in Amazon reconciliation

Amazon USA reconciliation usually depends on a set of operational and financial reports that help finance teams understand what happened at order, settlement, and payout level.

Internal and supporting files

• OMS export
• SKU master
• Internal order report
• Bank statement
• Books or ledger data
• Fee or rate file
• Returns or order metadata files

Amazon-side files

• Order report
• MTR report
• Disbursement report
• FBA return report
• Reimbursement report

Supporting data is especially useful when a reconciliation needs enrichment before matching, such as adding missing order details, normalizing identifiers, or calculating a net amount.

What the reconciliation engine compares

Cointab’s reconciliation engine can compare Amazon and OMS data using structured logic rather than one simple exact-match rule. That matters when records need to be grouped, netted, or compared across multiple identifiers.

The engine can support:

• One-to-one matching
• One-to-many matching
• Many-to-one matching
• Many-to-many matching
• Net-to-net comparison
• Partial matching
• Contra matching

It can also work with different matching methods, such as exact identifier matching, subset matching, and comparisons where references appear in different fields.

This is useful when:

• An Amazon order maps to multiple internal records
• Multiple internal records roll up into one marketplace settlement
• Amounts need to be netted before comparison
• Identifier formats differ between OMS and Amazon reports
• A partial difference needs review instead of a forced match

How exceptions are reviewed

Cointab separates reconciliation output into clear categories so finance teams can focus on exceptions instead of reviewing every row manually.

Fully matched

These are transactions where the identifier and amount match according to the configured rules.

Partially matched

These are transactions where the records appear related, but the amounts do not fully match. This often helps identify underpayments, overcharges, fee differences, or settlement adjustments that need review.

Unmatched

These are records present on one side but not found on the other. For Amazon sellers, this can help surface missing orders, missing settlements, delayed payouts, or records that were not captured correctly.

Skipped

Skipped records are rows that were not included in reconciliation because of a rule, missing data, invalid values, duplicates, or file issues. Keeping skipped items visible helps teams understand what was excluded and why.

AI-assisted review for open items

After structured matching is complete, Cointab can use AI to help analyze open transactions where rules are not enough.

AI can assist with:

• Cleanup of messy identifiers or references
• Analysis of difficult open items
• Identifying possible reasons for a mismatch
• Suggesting whether a file may be missing
• Highlighting differences that may be linked to returns, fees, deductions, or delays

AI remains reviewable and conservative. If the evidence is not strong enough, the item should stay unmatched rather than being loosely matched.

Reuse, automation, and recurring runs

Amazon reconciliation is rarely a one-time activity. Most teams need the same workflow every week or month, which is why reusability matters.

Once a reconciliation is configured, Cointab lets teams reuse the same setup for future periods instead of rebuilding it from scratch.

Recurring workflows can also be automated through:

• Email
• SFTP
• API

This means the required reports can be received or pulled automatically, the reconciliation can run on schedule, and the output can be delivered back to downstream systems when needed.

Why this matters for finance teams

For finance, accounting, and marketplace operations teams, Amazon reconciliation is not just about matching rows. It is about control, visibility, and closing the loop between internal records and marketplace outcomes.

Cointab helps teams:

• Reduce manual spreadsheet work
• Keep matching logic consistent across periods
• Review exceptions faster
• Maintain clearer audit trails
• Handle late or missed files without restarting the entire workflow
• Reuse the same reconciliation for future periods
• Work in a shared team workspace with roles and history

Amazon USA reconciliation scenarios Cointab can support

This type of workflow is useful for several marketplace finance scenarios, including:

• OMS sales vs Amazon order and settlement records
• Order and payment matching across marketplace exports
• Returns and reimbursements versus internal records
• Settlement reconciliation where fees and deductions need review
• Bank and books checks where Amazon deposits must be tied back to accounting records

The same reconciliation setup can also be extended as the business grows, so teams do not need to start over every time a new period begins or a report arrives late.

What finance teams see in the report

After reconciliation completes, users can review a dashboard with transaction-level detail and summary counts.

Typical output includes:

• Total summary
• Fully matched summary
• Partially matched summary
• Unmatched summary
• Skipped summary
• Filtered transaction tables
• Detailed matched transaction views
• Excel report download

This gives finance teams a clear view of what is correct, what needs follow-up, and what remains open for review.

FAQ

What files are usually needed for Amazon USA marketplace reconciliation?

A typical setup uses an internal OMS or sales file on Side A and Amazon reports on Side B. Supporting files such as SKU masters, rate files, returns files, or bank statements can also be added when enrichment or additional checks are needed.

Can Amazon reconciliation be reused for future periods?

Yes. Once the workflow is configured, the same reconciliation can be reused for future periods by uploading the new files and running the same setup again.

What happens if a file arrives late or was missed?

The missed file can be uploaded under the same reconciliation and the report can be refreshed. This helps finance teams handle delayed marketplace or bank files without rebuilding the workflow.

How are unmatched or partially matched records handled?

Cointab keeps these records visible in the reconciliation report so teams can review the differences, investigate the reason, and take the next action manually if needed.