Accrual vs. Cash for Ecommerce: Why Inventory Skews Profit
If you hold inventory for resale, accrual accounting usually gives you an accurate picture of profit, while cash accounting often distorts gross margin when large purchases get paid before sales happen. The main exception is the small-business gross receipts test, which sits at about $32 million for 2026. Below, we walk through the rules, a worked example, and the steps for switching methods.
TL;DR:
- The IRS generally requires accrual when merchandise drives income, but businesses averaging below about $32 million over three years may qualify for the 2026 exception.
- Inventory cost under accrual includes purchase, freight, customs, and eligible indirect costs; sellers must consistently use cost or lower of cost or market valuation.
- Changing methods generally requires Form 3115 with the tax return; sellers must count transition inventory, establish opening costs, and calculate any adjustment, often spread over years.
- Cash accounting can suit very small, low inventory operations when purchase and sale timing differs by only weeks; apply the chosen method consistently across channels.
Table of Contents
- How cash and accrual change reported profit
- IRS rules that trigger accrual and the small-business exception
- Inventory valuation and COGS under accrual accounting
- A seller’s checklist for choosing cash, accrual, or a hybrid
- Changing to accrual: Form 3115 and the bookkeeping work involved
- Keeping accrual books accurate with automated reconciliation
- Common mistakes sellers make and quick fixes
- BeanHawk as a way to simplify accrual bookkeeping
- FAQ
- Sources
How cash and accrual change reported profit
Cash accounting records income when money hits your account and expenses when you pay the bill. Accrual accounting records revenue when you make the sale and expenses, including the cost of goods sold, when that inventory actually sells, regardless of when you paid for it.
Here’s where that gap shows up in practice. Say you spend $40,000 on inventory in January and sell half of it for $60,000 spread across February and March.
- Under cash accounting, January shows a $40,000 loss because the full purchase hits that month’s books, even though nothing sold yet.
- Under accrual accounting, January shows no cost at all, and February and March each show the cost of the units actually sold alongside the revenue they generated.
On the balance sheet, accrual treats unsold inventory as an asset until it sells. Cash accounting has no such holding pattern: the expense is gone the moment you pay, whether or not the goods have moved. That timing mismatch is exactly what Publication 538 addresses when it explains why inventory-heavy businesses generally need accrual to keep income clearly reflected. Cash accounting can still tell you how much money is in the bank, but it will not tell you whether last month’s sales were actually profitable.
IRS rules that trigger accrual and the small-business exception
The IRS doesn’t leave this choice entirely up to you. Per Publication 538, when the production, purchase, or sale of merchandise is an income-producing factor in your business, you generally must use an accrual method for your purchases and sales, even if you use cash accounting for everything else.
- Most inventory-holding ecommerce sellers fall squarely into that rule.
- A small-business exception exists for taxpayers below the inflation-adjusted gross receipts threshold, which is about $32 million for 2026.
- Qualifying small businesses can treat inventory as non-incidental materials and supplies instead of using full accrual inventory accounting, under the conditions described in Publication 538.
- Switching between methods isn’t a bookkeeping choice you make quietly: it requires filing Form 3115 with the IRS.
For most sellers running six or seven figures in revenue, the $32 million threshold is far out of reach, which means accrual isn’t really optional. It’s the default the tax code expects.
Inventory valuation and COGS under accrual accounting
Once you’re on accrual, the next question is what actually counts as inventory cost. The IRS requires a consistent valuation method, and the two most common are cost and lower of cost or market, with LIFO available in some cases depending on your elections and record-keeping.
- Cost method: inventory is valued at what you paid to acquire and prepare it for sale.
- Lower of cost or market: inventory is valued at whichever is lower, your cost or current replacement value, which can reduce taxable income in a down market.
- LIFO: last-in, first-out valuation, used less commonly by smaller sellers due to its record-keeping demands.
Regulations and IRS guidance on inventory valuation also specify that acquisition costs, inbound shipping, and certain indirect costs tied to getting goods ready for sale belong in inventory cost, not as an immediate expense. For ecommerce sellers, that includes landed costs like freight and customs, which our guide on inventory cost capitalization breaks down in more detail. Get this wrong and your gross margin looks better or worse than it actually is, which throws off both pricing decisions and your tax return.
A seller’s checklist for choosing cash, accrual, or a hybrid
Before you lock in a method, there are a few questions worth settling with your accountant rather than guessing at.
- Is inventory a material part of your income, meaning does it drive most of your revenue?
- Are your average annual gross receipts over the last three years under the roughly $32 million threshold?
- Do you need gross margin figures that are accurate month to month for pricing or reorder decisions?
- Will a lender, investor, or buyer eventually need financials that reflect accrual-basis performance?
- Does your current software, whether QuickBooks, Xero, or a spreadsheet, actually support accrual postings and inventory tracking?
If inventory drives your revenue and you’re nowhere near the gross receipts threshold, accrual is the right default. Cash accounting can be acceptable for very small, low-inventory operations where purchase and sale timing rarely diverge by more than a few weeks.
Pro Tip: Whatever method you choose, apply it consistently across every sales channel and document the reasoning. Inconsistent treatment is one of the fastest ways to trigger IRS scrutiny.
Changing to accrual: Form 3115 and the bookkeeping work involved
Switching methods isn’t just a settings toggle. Form 3115 is the IRS mechanism for requesting a change in accounting method, and it generally needs to be filed with your tax return for the year of the change.
- Take a physical or system-based count of beginning and ending inventory for the transition year.
- Capitalize the value of beginning inventory onto the balance sheet instead of leaving it expensed.
- Calculate any resulting adjustment to taxable income from the method change, which the IRS typically allows you to spread over several years.
- Reconcile prior settlements and purchase records so your opening inventory figures match actual unit costs and landed costs.
- Confirm your accounting software, whether QuickBooks or Xero, is configured for accrual postings and recurring inventory reconciliation.
Plan for this to take real time during the transition quarter, not just a single afternoon of data entry.
Keeping accrual books accurate with automated reconciliation
Accrual accounting is only as good as the data feeding it, and multichannel settlements are where errors creep in fastest. Automated settlement posting and continuous monitoring of inbound shipment and ledger events reduce the reconciliation gaps that otherwise throw off COGS. Our resource on automating ecommerce accounting covers this in more depth, and our Amazon FBA bookkeeping guide walks through reconciling settlement events specifically.
When evaluating any automation for this, check for:
- Coverage across every sales channel you sell on, not just Amazon.
- Continuous monitoring of inbound shipments so damaged or lost units get flagged.
- Direct posting into QuickBooks or Xero rather than manual journal entry.
- Clear handling of returns and FBA adjustments so they land in the right period.
Common mistakes sellers make and quick fixes
The most common error we see is sellers expensing a big inventory purchase under cash accounting, then wondering why one month looks disastrous and the next looks great. A close second is ignoring landed costs, like freight and customs fees, and leaving them out of inventory value entirely.
Two fixes solve most of this: switch to accrual the moment inventory becomes a real driver of revenue, and capitalize landed costs from day one instead of expensing them as they’re paid. For anything involving a formal method change or multi-year adjustments, bring in a CPA rather than guessing.
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BeanHawk as a way to simplify accrual bookkeeping
Once you’ve settled on accrual, the harder part is keeping it accurate month after month. We built BeanHawk around that exact problem: continuous monitoring of inbound shipments and FBA ledger events, automated recovery of funds Amazon owes you, and settlement postings that go straight into QuickBooks or Xero with no commission taken on what we recover for you.
- Reconcile multichannel settlements automatically so COGS reflects what actually happened, not what a spreadsheet approximated.
- Post penny-accurate summarized journal entries for every channel, keeping inventory economics current without manual entry.
- Flag reimbursement gaps, like lost or damaged inbound units, that otherwise quietly erode margin.
Run a free FBA reimbursement audit to see what’s currently unreconciled, or check pricing to find the plan that fits your order volume.
This article is general information, not a substitute for advice from a qualified financial advisor. Consult a qualified financial professional about your own circumstances before acting on anything here.
FAQ
What is the key difference between cash and accrual accounting?
Cash accounting records income and expenses when money actually moves, while accrual accounting records them when a sale happens or a cost is incurred, regardless of payment timing. For inventory sellers, this means accrual matches revenue to the cost of the goods sold in that same period, which Publication 538 identifies as the standard requirement when merchandise is an income-producing factor.
What businesses can use cash basis accounting?
Businesses where inventory isn’t a material income-producing factor, such as most service businesses, generally qualify for cash accounting. Small businesses under the inflation-adjusted gross receipts threshold, about $32 million for 2026, can also qualify for an exception even if they carry some inventory.
What accounting methods can ecommerce sellers choose from?
The two primary methods are cash and accrual, with a hybrid approach also permitted in some cases, like using cash for general expenses while using accrual for inventory purchases and sales. Publication 538 outlines which combinations are allowed depending on your business structure and gross receipts.
What are the pros and cons of accrual accounting for ecommerce?
Accrual accounting gives a more accurate month-to-month gross margin because it matches revenue to the cost of goods actually sold, which supports better pricing and reorder decisions. The tradeoff is more bookkeeping work, including inventory counts and capitalizing landed costs, which is where automated settlement reconciliation tools can reduce the manual burden.
Do I need to file anything with the IRS to switch accounting methods?
Yes, changing from cash to accrual, or the reverse, generally requires filing Form 3115 with the IRS in the year of the change. The form formally requests IRS consent and often spreads any resulting income adjustment over multiple years rather than all at once.
Sources
- Instructions for Form I-8990 (IRS)
- Form 1125-A guidance and inventory valuation (RegInfo / Treasury documents)