The four-tool stack
Ask an Amazon seller how they know their profit and you will often hear a list. A settlement connector such as A2X or Webgility to post payouts to the books. A profit dashboard such as Sellerboard to see margin by product. A spreadsheet or planning tool to decide what to reorder. And accounting software to hold it all for the accountant.
Each tool solves a real problem, and many sellers run this setup successfully. But the tools do not share a ledger, so each calculates profit its own way, from its own copy of the data, on its own schedule.
There is also the cost of the stack itself: several subscriptions, several logins, and several vendors to call when something does not match.
Where the numbers drift apart
The dashboard shows one margin, the P&L shows another. The difference is usually in the details: product cost entered in one tool but not updated in the other, inbound freight included in one and expensed in the other, ad spend counted when it was billed in one and when it was incurred in another, reimbursements recognized in one and missed in the other.
Tax adds another layer. Amazon collects sales tax as a marketplace facilitator in US states and in some Canadian situations. If your tools do not keep that tax separate from tax you collect yourself, you risk overstating liabilities or remitting the same tax twice.
- Product cost and landed cost out of sync
- Ad spend timing differs between tools
- Reimbursements missed or double counted
- Marketplace-facilitator tax mixed with seller-collected tax
- Settlements that cross month-end split differently
What one P&L looks like
SeroBooks for Amazon puts Amazon economics into the same double-entry ledger as the rest of your business. Settlements are posted with fees itemized: referral, fulfillment, storage and the rest. Amazon Ads spend from Sponsored Products, Sponsored Brands and Sponsored Display lands on the P&L, with TACOS reported alongside. Returns and reimbursements are recorded, and marketplace-facilitator tax is split from tax you owe.
Because sales can be invoiced by order day, revenue lands in the month it happened, not the month the settlement closed. The P&L your accountant sees and the margin you look at every morning are the same number.
Inventory and replenishment in the same place
The ledger also knows your inventory: stock at Amazon fulfillment centres, inbound shipments in transit, and stock in your own storage, valued at landed cost. Forecasting and replenishment work from the same data, so a reorder suggestion knows both how fast a product sells and what it really costs.
Maya, the AI employee in SeroBooks, can draft purchase orders and reorder points from that data, and like everything Maya does, nothing is sent without your approval.
Questions to ask about your current setup
Before deciding whether to consolidate, test your current stack with a few questions. Does last month’s profit in your dashboard match the P&L your accountant prepares, within a small margin? Can you explain the difference if it does not? Is inbound freight in your product cost, and is it the same in every tool? Do you know how much Amazon reimbursed you last quarter, and is that income in your books?
Then look at tax. Can you show, for each marketplace, how much sales tax Amazon collected as a facilitator versus how much you collected and remitted yourself? And at month-end, does your Amazon clearing account return to zero after each payout?
If the answers are yes, your stack is working. If several are no, the problem is usually not any single tool but the gaps between them, and that is what one ledger is designed to remove.
Moving across without losing history
Sellers moving from QuickBooks Desktop can use SeroBooks’ migration with a dry run to bring their books across and check balances before committing. Sellers on QuickBooks Online can import their data. Either way, pick a clean start date, ideally the beginning of a month or quarter, and post settlements in SeroBooks from that date forward so no settlement is counted in both systems.
Who it fits and what it costs
SeroBooks for Amazon covers Amazon.ca, Amazon.com and Amazon.com.mx, so it fits North American sellers. It is $150 USD a month ($1,500 a year), includes core accounting, and has a 14-day free trial. Sellers on other SeroBooks plans can add the Amazon module for $100 USD a month.
If your current stack works and the numbers agree, there may be no reason to change. But if you spend time each month explaining why your dashboard and your books disagree, one ledger is worth a look. Our Amazon seller accounting guide walks through the bookkeeping either way.