Merging Amazon Ads Reports Across Multiple Accounts

Where duplicate spend can hide

When reports from separate accounts are stacked, the same row may appear in more than one export or a daily file can include overlapping date ranges. Without a consistent identifier, totals for clicks, cost, and sales can quietly inflate.

Using a unified view like Amazon Ads Dashboard by Todoza can help because the data is consolidated rather than manually stitched together. The account name or ID should remain part of every row so you can still filter back to a single seller account when needed.

A simple merge routine

A practical approach is to keep one folder for raw exports, normalize the headers, and append all files into a single table. Before summing, create a unique key from account, campaign, ad group, keyword or search term, and date, then remove duplicates based on that key.

• Export each account in CSV or XLSX format on the same schedule.
• Keep column names identical across accounts.
• Deduplicate before aggregating spend, clicks, and sales.
• Save the consolidated file as the single source for daily reporting.

When this matters

This process becomes important when you report spend to stakeholders or reconcile budgets across brands. A small duplicate from one marketplace can grow into a noticeable reporting error over a month.

Teams managing several Amazon marketplaces or client accounts should standardize the merge before reports are shared. The result is a cleaner picture of total advertising cost, ROAS, and wasted spend without manual recalculations.