Hundred MSHome / Blog / AP outsourcing: cost and sign-off
Accounts payable outsourcing: cost, workflow and sign-off
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Book a callAccounts payable outsourcing hands invoice entry, coding, matching and approval to an outside team. Hundred MS does not run payments; that stays with you. Cost and scope shift with invoice volume and approval layers. Here’s the real question: who checks and signs each invoice before it’s paid, by name. Ask that before you ask about price.
- Accounts payable outsourcing cost moves with invoice volume, approval layers and whether the provider runs payments, not one flat rate.
- An independent auditor reviews a provider’s SOC report under SSAE No. 18, section AT-C 320, to assess whether its controls are designed and operating effectively.
- In our work, AI enters and codes invoices, and a named senior accountant signs off before anything ties out and is paid.
How much does it cost to outsource accounts payable?
There is no flat rate for accounts payable outsourcing. Cost moves with invoice volume, approval steps, and whether the provider runs payments or just prepares them. The right question is not the headline rate. It is which of those three drives your own volume. Ask a provider for a scope tied to your own numbers before you compare quotes. Read on for when in-house still works and when it doesn’t.
Keep accounts payable in-house while one person can review every invoice without delay.
Consider outsourcing once volume, backlog or missing approval steps start slowing your close.
As with bookkeeping, we give a written scope and quote within 2 days of the first call.
That follows a free 30-minute discovery call with Narek. See our bookkeeping service.
How does accounts payable outsourcing actually work day-to-day?
Each week, invoices arrive and staff match them to a purchase order or vendor record. Then they code them to the right account and move them through approval. The provider checks the sub-ledger against the bank before release. In our work a named senior accountant signs off on that last step before anything is paid. Outsourcing changes who does the work, not who decides when to pay.
Say a batch has 40 invoices worth $50,000 total. AI matches and codes all 40 against purchase orders. A senior accountant reviews the batch, flags one $2,000 invoice with no matching PO, and holds it. The other 39 invoices, $48,000, post and move to payment. These numbers are illustrative, not a client result.
Outsourcing changes who processes the invoice, not when you choose to pay it.
That decision, and your cash timing, stays yours.
AP outsourcing for NetSuite works the same way, inside the ledger rather than a side spreadsheet.
See how this fits the broader close in NetSuite accounting.
Look at your last ten accounts payable invoices: how many did a named person check and sign off before payment?
How does Hundred MS’s AP outsourcing differ from a typical provider?
Hundred MS places a named senior accountant at the center of the process. AI enters and codes each invoice, matched against the purchase order and vendor record. That accountant checks and signs before anything posts. It is not a queue you never see.
Across all Hundred MS engagements to date: 43 companies served, 26 still with us.
We have 17 professionals on the team. A fractional CFO can sit above AP for cash timing and vendor risk.
What should you check before signing an AP outsourcing contract?
Before you sign, check who can see or move money in your bank account, and what control report the provider can show you. Ask any provider whether an outside auditor has checked their controls, and ask to see the report. Ask too how fast you get a written quote once you share your numbers.
That standard comes from SSAE No. 18, section AT-C 320, effective since May 1, 2017.
It defines two report levels, type 1 and type 2, set out in the System and Organization Controls framework.
An auditor uses that standard to evaluate a provider’s controls, per SSAE 18 guidance.
Hundred MS starts every engagement the same way: a free 30-minute discovery call, then a written quote within 2 days.
Your data stays yours throughout.
Is outsourcing accounts payable a dying concept or is it changing?
Accounts payable outsourcing is not dying; it is changing. AI now runs the repetitive parts, data entry, matching and coding are handled first by software, but a person still checks the output before payment. The relationship shifts toward a smaller team working with software, with one named person accountable for each number.
See how we set this up in AI for your finance team.
Where does a service help, and where can you do it alone?
You can run parts of accounts payable yourself. Ask any provider for their access model and a written quote before you sign anything. Where Hundred MS helps is the daily work: AI enters and codes each invoice. A named senior accountant checks the match and signs off before it posts.
We work inside your own accounting system, not a side spreadsheet.
A fractional CFO sits above the queue for cash timing when you need one.
Where this goes wrong
| The problem | What it costs you | The fix |
|---|---|---|
| Signing an AP outsourcing contract without checking bank access rights | Vendor data and payment rails exposed to an unreviewed queue | Require read-only access and a named sign-off step before any invoice is paid |
| Comparing providers on price per invoice alone | Hidden cost appears once a backlog surfaces coding mismatches | Ask for a written scope that covers backlog cleanup, not just steady-state volume |
| Treating AP automation software as the whole answer | Errors ship because nobody checks the coded output | Pair the software with a reviewer who signs off, named, before release |
Based on SSAE No. 18 and the System and Organization Controls framework for service-organization controls, and on Hundred MS’s own published engagement numbers and case studies.
Sources we opened and checked for this guide:
Published October 2026. Checked in October 2026. If something here is out of date, tell us and we will fix it.
