Year-end accounting outsourcing: what to buy and how to check it

Three scopes, and the one the return needs

Close only means the provider reconciles the books to December 31 and stops at a reconciled trial balance. The work includes bank and credit card accounts matched to statements, including outstanding deposits and checks in transit, plus receivables, payables, inventory, accruals, prepaid expenses, depreciation, loan balances with accrued interest and the payroll liability accounts. The provider should hand over the reconciliation behind each balance.

Close plus tax package adds what the client's CPA needs to prepare the return. Expect a fixed asset schedule, a bad debt schedule, year-end AR and AP aging, a sales tax liability reconciliation where the client collects sales tax, a 1099 vendor list and a note explaining each adjusting entry. Use this scope when the CPA prepares the return and the firm's job ends at the handoff.

Full CAS means the provider also keeps the monthly ledger through the year, runs the payroll reconciliations and quarterly tie-outs, and answers the CPA's questions after the close. Decision rule: if the monthly books are not current, quote full CAS or a separate clean-up first, because a year-end close cannot repair months of unreconciled transactions in two to three weeks.

How the quote is built, and what it must state

Providers price year-end work in four ways: a fixed fee for the close, hourly billing against a written estimate, a monthly retainer that includes year-end, or a year-end add-on billed on top of a monthly package.

Check every quote against hours. One CPA firm publishes an estimate of 20-30 hours for an organized client with monthly bookkeeping and 50-80 hours for a disorganized one, with a close taking two to three weeks (Taxstra). A quote built on the 20-30 hour band is wrong before work starts if the client's books were behind in October. Ask which band the quote uses and what happens when the file moves to the second band. At the same hourly rate, a 50-hour file costs two and a half times a 20-hour estimate.

Confirm whether the quote includes the tax return. Close and return fees are often separate line items, and if the quote does not name the return, assume it is excluded. For an in-house comparison, LBMC's article cites a $52,000 to $75,000 salary range for a full-time bookkeeper, before hiring, training and benefits. That is an external figure for framing annual cost, not a price for one close.

What the client must provide, and the dates that set the timing

The provider can only close what it can see. Request bank and credit card statements through December 31, 2026 for every account, including any statement that closes in early January. Add loan statements showing the December 31 balance and the interest paid, a fixed asset list with purchase dates, costs and disposals, and the 2026 sales tax returns with their payment confirmations.

Inventory is the input clients skip most often. Taxstra's stated split is that the client provides the physical count, and the provider enters it and reconciles it to the books. Ask for the signed count sheet with the date of the count, and ask for it before the close starts.

Set the client dates from the forms. Form 941 for the fourth quarter of 2026 is due January 31, 2027. January 31, 2027 is a Sunday, so under the weekend rule in IRS Publication 509 the return is timely if filed by Monday, February 1, 2027. Forms 1099-NEC for 2026 payments are due on the same January 31 date. Collect the W-9s before the vendor list goes to the provider, and send the request in late December, because Taxstra recommends starting then rather than in January.

Usual's request builder can mark an item not applicable or will send later with a date, so a gap shows up early.

Failure modes and the fix for each

The bank reconciliation ties to a statement that stops in November. Fix: get the December statement and the list of December checks that cleared in January. Without both, the outstanding items line is an estimate, and the CPA will ask where it came from.

The 1099 vendor list is built from the bank feed, so card payments and processor deposits show up as vendor payments. Fix: match each vendor to its W-9 and its payment method. For 2026, a payment settlement entity reports on Form 1099-K only when payments exceed $20,000 and the transactions exceed 200, per the IRS instructions for Form 1099-K. A vendor paid by card below those levels gets no 1099-K from the processor, so check the Form 1099-NEC instructions on card and payment app payments before listing a vendor.

An LLC or corporation goes on the list automatically. Fix: read the tax classification on the W-9. Form 1099-NEC is generally not required for payments to an incorporated business, including an LLC taxed as a C or S corporation, unless the payment is for legal or medical services. An LLC taxed as a partnership is not in that group, so the classification decides it.

A vendor never gave a TIN. Fix: the IRS instructions say backup withholding applies to persons who have not given their TINs, and a Form 1099-NEC must be filed for each person from whom backup withholding was taken, regardless of the amount. Send one written request, keep the record and tell the client the exposure before the next payment.

Quality controls to test before signing

Ask for the close checklist with a preparer line, a reviewer line and a date on each. Taxstra says it follows its checklist strictly and recommends a final double-check before the close is finalized. The test is whether the reviewer is a named person who did not prepare the file, and whether that person's initials appear on the trial balance.

Ask for the journal entry memo behind every adjusting entry. Taxstra says each adjustment is documented with a journal entry explaining why. A provider that cannot produce the memo for a single accrual cannot hand the CPA an auditable close.

Ask how the firm's quality management system meets the AICPA standard SQMS No. 1. According to the Journal of Accountancy, firms had to establish that system by December 15, 2025 and must evaluate it by December 15, 2026. Ask for the most recent peer review report if the firm has one.

Under 31 CFR 10.22 a practitioner must exercise due diligence in preparing, approving and filing tax returns. Under 31 CFR 10.36 the individual with principal authority over the firm's practice must take reasonable steps to ensure the firm has adequate procedures in effect for all members, associates and employees. Ask the provider to name that individual.

If any of the provider's staff work outside the United States, the regulation requires the client's consent under 26 CFR 301.7216-3 before tax return information goes to that preparer. A Social Security number must be masked before it leaves the United States unless an adequate data protection safeguard applies. Put the consent in the engagement letter before the first upload, and name the provider in it.

A 30-minute test before you sign

Ask for one redacted close file from a client of similar size. Check three things: whether the trial balance ties to the reconciliations, whether the 1099 vendor list ties to the vendor ledger and the W-9 file, and whether every balance sheet account points to a schedule. If one of the three is missing, the provider is selling a process, not a close.

Write the scope into the engagement letter as a list: each schedule, the date of the final trial balance, the turnaround for CPA questions and the client input deadline. Decision rule: if the provider will not put a date on the input deadline, do not sign a fixed-fee close, because the fee assumes a file that arrives on time.

If the monthly books are not current, price the clean-up separately from the close. Run the bookkeeping cleanup checklist first, then quote the year-end close on the cleaned books.