Bill.com Holdings, Inc. BILL Moat

Key data

The moat

A small business that runs its accounts payable through BILL has connected it to its accounting system, its bank, and every vendor it pays. Approval workflows are configured, vendor records hold banking details, and the accountant who set it up bills by the hour to move it. That is a switching cost that grows with every invoice processed.

The distribution is the second half. Accounting firms deploy BILL across their client books, so the relationship is often with the bookkeeper rather than the business, and the bookkeeper standardises on one platform across dozens of clients.

What it produces is expansion within accounts. Net dollar retention rose from 92% to 95% across three fiscal years, meaning a cohort of businesses spends 95 cents on the dollar more each year than it did before, before any new customer is added.

Widening or narrowing

The two halves of the growth equation have separated.

The logo count inflected in December 2025 and has fallen 3.9% since, while volume rose 16% over the same two quarters. The take rate held flat throughout, which is genuinely good in a category where compression was the consensus expectation. Transactions rose from 29.7 million to 37.4 million, faster than volume, so the average payment got smaller while the number of them grew.

Growth is now entirely wallet share on a shrinking base. Rising net dollar retention confirms the mechanism: existing customers spend more, and there are fewer of them.

The overrated case. The improving retention number is the one management leads with and it measures only the customers who stayed. A metric computed on survivors will improve as the weakest cohort leaves, which is exactly what a falling logo count means. Both figures can be true and only one describes the moat.

On profit pool, BILL takes roughly forty basis points of the money it moves for a small business, which is a modest slice of a payment the business had to make anyway. The larger economic value sits with the banks holding the funds in transit and with the card networks where the payment goes on a card, neither of which BILL controls. That is why the take rate matters more than the volume: a thin slice of a large flow only compounds if the slice holds.

The moat is widening per customer and narrowing in reach.