The short answer: Accounts payable outsourcing hands a provider the invoice-to-payment cycle: capture, coding, approval routing, payment runs, and the vendor file. Tax preparation outsourcing hands a firm the annual return and the information returns that feed it. In the worked example below, an in-house AP clerk costs $15.87 per invoice at 380 invoices a month, so any outsourced quote can be tested against that number.
- AP outsourcing covers five tasks; the business keeps approval authority and bank access.
- A median bookkeeping clerk earned $50,670 a year in May 2025, or about $72,386 fully loaded.
- The IRS puts average S corporation return burden at 60 hours and $4,800 in out-of-pocket cost.
- Form 1099-NEC reporting starts at $2,000 per payee for payments made after December 31, 2025.
- A missed 1099 filed after August 1 costs $340 per return; 31 missed forms cost $10,540.
Last updated October 2026.
Most outsourcing decisions start with the books. The ledger is the obvious handoff. The next two candidates sit on either side of it: accounts payable, which feeds the ledger every day, and tax preparation, which consumes it once a year.
This guide sets the scope and cost of each. It covers what a provider actually does, what stays with the owner, how to price a proposal, and where the two services meet. They meet at the vendor file, because the W-9s collected in AP become the 1099s filed at tax time.
What is accounts payable outsourcing?
Accounts payable outsourcing is a contract under which an outside team runs the cycle from vendor invoice to vendor payment. The business keeps the decision rights. The provider does the processing.
A complete scope has five parts. Invoice capture pulls bills from an AP inbox into Bill.com or a similar tool. Coding assigns each bill to the general ledger account and class in QuickBooks Online, Xero, or NetSuite. Approval routing sends each bill to the right budget owner. Payment runs batch approved bills on a fixed weekly or biweekly schedule. Vendor management keeps the master file, the W-9 on record, and the payment details current.
Two items should never leave the business. The first is final payment approval above a set dollar threshold. The second is the authority to add or change a vendor’s bank account. Keeping both inside closes the most common route for payment fraud.
What stays in-house when you outsource AP?
Authority stays in-house; labor moves out. The owner or controller still approves spend, releases payments, and owns vendor relationships.
The provider works inside the company’s systems, under its own user login. Every action is logged to a named user, which gives the audit trail an outside reviewer will ask for. The company retains ownership of the AP tool, the bank connection, and the records.
The handoff also changes month-end. A provider that codes bills daily keeps the AP aging current, so the close starts from a reconciled subledger. Our guide to the accounts payable month-end close covers cutoffs and accruals. Late or uncoded bills are the usual reason a close slips past day 10.
What does accounts payable outsourcing cost?
Price it per invoice, then compare it with the cost of the hire it replaces. Monthly retainers and per-invoice fees both reduce to the same unit.
The internal benchmark comes from public wage data. The Bureau of Labor Statistics reports a median annual wage of $50,670 for bookkeeping, accounting, and auditing clerks as of May 2025, or $24.36 an hour. Wages made up 70.0% of private-industry compensation as of June 2026, so the fully loaded cost is about $72,386 a year.
That figure is the ceiling for an outsourced quote at the same volume. A useful test runs the quote through three questions. What volume does the fee assume? Which tasks sit outside the fee, such as vendor onboarding or 1099 preparation? What happens to the price when invoice count rises by 30%?
What does tax preparation outsourcing include for a business?
It includes the federal and state income tax returns, the extensions, and the information returns that support them. For most owners, the critical piece is the handoff between closed books and the preparer.
The return type sets the deadline. A calendar-year partnership files Form 1065 by March 15. An S corporation files Form 1120-S on the same date. Form 7004 extends the time to file, but the IRS instructions are direct: “Form 7004 does not extend the time to pay any tax due.”
Information returns arrive first. Form 1099-NEC is due to the IRS on January 31, or the next business day when that date falls on a weekend. That means vendor totals must be final within a month of year-end. Our year-end close in QuickBooks Online guide lists what a preparer will request. A preparer who receives reconciled books spends the engagement on tax positions, not on rebuilding the ledger.
What does it cost to outsource business tax preparation?
The IRS publishes its own estimate. In the Form 1120-S instructions, the average burden for S corporation and similar returns is 60 hours and $4,800 in out-of-pocket cost, which includes preparer fees and software.
The same instructions put a partnership return at about 60 hours and $5,300, and a Form 1120 C corporation return at about 90 hours and $8,600. The IRS adds a caution worth repeating: these are “national averages and don’t necessarily reflect a ‘typical’ case.”
Three factors move a quote above or below those averages. The first is the state footprint, since each state return adds work. The second is book quality, because cleanup billed at tax time costs more than cleanup done monthly. The third is complexity: fixed-asset schedules, multiple owners, and entity changes all add hours.
How do accounts payable and tax preparation connect?
Through the vendor file. Every contractor paid through AP is a potential 1099, and the data needed to file it is collected, or missed, at onboarding.
The threshold changed for 2026. For payments made after December 31, 2025, Form 1099-NEC reporting starts at $2,000 per payee, up from $600, with inflation indexing from 2027. Fewer payees cross the line, but the tracking requirement remains.
A missing taxpayer ID creates a second exposure. The IRS states that “the payer is required to withhold at the current rate of 24 percent” when a payee fails to provide a correct TIN, as described on its backup withholding page. An AP process that blocks payment until a W-9 is on file removes that risk before it starts.
Worked example: does outsourcing AP and tax prep pay off?
Take an illustrative S corporation with $18,000,000 in revenue, 380 vendor invoices a month, 46 contractor payees, and 3 shareholders.
- In-house AP clerk, fully loaded: $50,670 ÷ 0.70 = $72,386 a year, or $6,032 a month.
- Cost per invoice: $6,032 ÷ 380 = $15.87.
- An illustrative outsourced quote of $2,850 a month: $2,850 ÷ 380 = $7.50 per invoice.
- Annual difference: ($6,032 − $2,850) × 12 = $38,184.
The tax side shows what weak AP data costs. If 31 of the 46 payees cross $2,000 and the company files their 1099s after August 1, the penalty is 31 × $340 = $10,540. If the Form 1120-S is also 4 months late, the penalty adds $255 × 3 shareholders × 4 months = $3,060. Those two failures total $13,600, nearly three times the IRS average out-of-pocket cost of a full return.
Which tasks should a business outsource first?
Start with the high-volume, rules-based work, and keep judgment calls close. The table maps each task to a typical owner.
| Task | Outsource? | Who keeps authority | Key date or limit |
|---|---|---|---|
| Invoice capture and coding | Yes | Provider, reviewed monthly | Coded within 2 business days of receipt |
| Approval routing | Yes, the setup | Budget owners approve | Dollar threshold for second approver |
| Payment release | No | Owner or controller | Fixed weekly or biweekly run |
| Vendor bank changes | No | Owner, with call-back check | Verified before the next run |
| W-9 collection and 1099s | Yes | Provider, owner signs off | 1099-NEC due January 31 |
| Federal and state returns | Yes | Owner signs the return | Form 1065 and 1120-S due March 15 |
At Debit & Co., Aaron Ressel and Kevin Cahill review the year-end vendor file before any 1099 is filed. The Continuous Close Method™ keeps AP coded daily, so the year-end file is current by the first week of January.
For the broader decision between building and buying a finance team, see in-house vs. outsourced bookkeeping, and for how the core service runs, see outsourced bookkeeping, explained.
Frequently asked questions
What is accounts payable outsourcing?
It is a contract under which an outside team runs invoice capture, coding, approval routing, payment runs, and vendor records. The business keeps payment approval and control of vendor bank details.
What does it cost to outsource your tax preparation?
The IRS estimates an average S corporation return at 60 hours and $4,800 in out-of-pocket cost, a partnership return at $5,300, and a C corporation return at $8,600. State filings, book quality, and complexity move the quote.
What is CPA outsourcing?
It means engaging a CPA firm for work an internal team would otherwise do, such as tax returns, the year-end close, or review of monthly statements. The business still signs its own return.
What is accountant outsourcing for bookkeeping services?
It is a monthly engagement in which an outside accountant records transactions, reconciles accounts, and closes the books. AP and 1099 preparation are often added to the same scope.
Does the 2026 1099 threshold change AP outsourcing?
Yes. Form 1099-NEC reporting now starts at $2,000 per payee for payments made after December 31, 2025. AP still needs a W-9 on file for every contractor to track who crosses the line.
Sources: Internal Revenue Service, Instructions for Form 1120-S, Instructions for Form 1065, Instructions for Form 7004, Instructions for Forms 1099-MISC and 1099-NEC, General Instructions for Certain Information Returns, and Backup Withholding; U.S. Bureau of Labor Statistics, Occupational Employment and Wage Statistics, May 2025, and Employer Costs for Employee Compensation (all accessed October 2026). The company, invoice volume, payee counts, and outsourced quote in the worked example are illustrative.
