1099 Checklist for Accountants: Preparing Client 1099s for the 2026 Tax Year

A 1099 checklist for accountants should cover five stages for every client: confirm who is a reportable payee, collect and validate W-9s, tie payment totals to the ledger, prepare and review the forms, then file and furnish by the deadline. For payments made in 2026, the reporting threshold for most Form 1099-NEC and 1099-MISC boxes rises from $600 to $2,000, and the 1099-NEC deadline falls on February 1, 2027.

This guide sets out that 1099 checklist for accountants stage by stage, with the 2026 rule changes built in, a worked client example, and a split of which tasks a CPA firm can hand to a support team and which stay with the reviewer. Starting the vendor and W-9 work in October or November keeps January free for review instead of chasing.

2026 Rule Changes to Build Into the Checklist

The One Big Beautiful Bill Act (P.L. 119-21) changed the dollar test that drives most client 1099 work. The IRS Instructions for Forms 1099-MISC and 1099-NEC state that "for tax years beginning after 2025, the minimum threshold amount for reporting certain payments required to be reported on certain information returns and/or perform backup withholding on those payments increased to $2,000" and that the amount may be adjusted for inflation beginning in calendar year 2027.

In practice, for the forms your team prepares in January 2027:

Two points catch firms out. The $600 test still applies to gross proceeds paid to an attorney, and backup withholding follows the same $2,000 threshold change. Our page on the 2026 1099 reporting threshold covers the law change in more depth, and the IRS 1099-MISC and 1099-NEC filing requirements guide lists the exceptions box by box.

Payment app and card thresholds moved too. The IRS confirmed in IR-2025-107 that third-party settlement organizations file Form 1099-K only when "the gross amount of reportable payment transactions to a payee exceeds $20,000 and the number of transactions exceeds 200." That matters for your clients' own income and is covered in our guide to the Form 1099-K reporting threshold.

The 1099 Checklist for Accountants, Stage by Stage

Work through the stages below for each client. The order matters because form preparation goes fastest when the data cleanup is finished first.

Stage 1: Set up the client list (October to November)

• List every client for whom the firm prepares 1099s, and note who owns vendor data at the client.
• Confirm the engagement letter covers 1099 preparation and filing.
• Record each client's accounting system, payment methods used during the year and prior-year 1099 count.
• Flag clients that started paying contractors this year or changed bookkeeping systems.

Stage 2: Review the vendor master file

• Pull the full vendor list and merge duplicates (for example, "ABC Plumbing" and "ABC Plumbing LLC").
• Mark each vendor's entity type from the W-9: individual or sole proprietor, single-member LLC, partnership, C corporation, S corporation.
• Mark attorneys and law firms separately, since they are reportable even when incorporated.
• Mark foreign vendors. The IRS instructions direct payers to use Form 1042-S for payments to nonresident aliens, so these vendors should carry a Form W-8 instead of a W-9.

Stage 3: Collect and validate W-9s

• Send W-9 requests to every vendor missing one, using the current form from the IRS About Form W-9 page.
• Check that the name and TIN on the W-9 match the vendor record exactly.
• Use the IRS TIN Matching service, which "lets you validate TIN and name combinations before submitting an information return." It is available to payers and their authorized agents, so the firm or client must register before January.
• Escalate any vendor that refuses or ignores the request.

Stage 4: Tie payments to the ledger

• Run a vendor payment report for January 1 to December 31, 2026 on a cash basis.
• Exclude payments made by credit card, debit card or payment apps. The IRS instructions state that these "must be reported on Form 1099-K by the payment settlement entity under section 6050W and are not subject to reporting on Form 1099-MISC or Form 1099-NEC."
• Exclude reimbursements for merchandise, freight and similar items the instructions list as not reportable.
• Compare totals to the general ledger and to the prior year. Large swings deserve a question to the client.

Clean books make this stage short. Our post on client bookkeeping workflow for CPA firms covers the monthly coding habits that keep vendor data usable at year end.

Stage 5: Apply the threshold and choose the form

• Apply the $2,000 test per payee for 2026 payments, with the exceptions in the table above.
• Remove payments to C and S corporations unless an exception applies. The instructions list "payments to a corporation (including a limited liability company (LLC) that is treated as a C or S corporation)" among payments that generally do not need a 1099.
• Choose 1099-NEC for services and 1099-MISC for rents, prizes, other income and attorney gross proceeds.
• Report any federal income tax withheld under backup withholding regardless of the amount paid.

Stage 6: Prepare, review and approve

• Prepare draft forms or an import file in the firm's filing software.
• Have a reviewer check name, TIN, address, amount, form type and box for each draft.
• Send the client a summary listing every payee, amount and form, and get written approval before filing.

Stage 7: File, furnish and store

• File electronically if the client has 10 or more information returns in total.
• Furnish recipient copies by the deadline.
• Save the approval, the final forms, the IRS acknowledgment and the W-9s in the client file.

Key 2027 Deadlines for Tax Year 2026 Forms

The IRS instructions state that you must "file Form 1099-NEC on or before January 31, using either paper or electronic filing procedures," and file Form 1099-MISC "by February 28, if you file on paper, or March 31, if you file electronically." When a date falls on a weekend or legal holiday, the deadline moves to the next business day.

January 31, 2027 and February 28, 2027 both fall on a Sunday, which is why the dates roll forward.

On e-filing, the General Instructions for Certain Information Returns state: "If you are required to file 10 or more information returns during the year, you must e-file." Since 2024 the 10-return threshold is calculated by aggregating all information returns the client files, so check the count in Stage 1. The filing channel is also changing. In IR-2026-99, the IRS set November 19, 2026 at 3 p.m. ET as the last day to file through the FIRE system and said current FIRE users must move to the Information Returns Intake System (IRIS) to file tax year 2026 returns. Our checklist for moving from FIRE to IRIS covers the setup steps.

Worked Example: One Client's 2026 Vendor List

A client paid seven vendors in 2026, totalling $59,350. Here is how the checklist sorts them.

The client files four forms: three 1099-NEC and one 1099-MISC. Under the 2025 $600 rule, the designer's $1,850 would also have needed a 1099-NEC.

The cleaner is the problem payee. Without a TIN, the client was required to withhold 24 percent from reportable payments; applied to the full $2,600, that is $624. The IRS backup withholding page confirms that the payer is required to withhold "at the current rate of 24 percent" when a payee fails to provide a correct TIN. Collecting the W-9 before the first payment avoids this. Our explainer on backup withholding covers how to stop and report it.

Penalties a 1099 Checklist Helps Avoid

The current General Instructions for Certain Information Returns list the penalty per information return for returns due in 2026: $60 if you correctly file within 30 days after the due date, $130 if you correctly file more than 30 days late but by August 1, and $340 after August 1 or when no return is filed. Intentional disregard starts at $680 per return. For returns required to be filed after December 31, 2026, the IRS General Instructions for Forms W-2 and W-3 (2026) show the same $60, $130 and $340 tiers and raise the intentional disregard minimum to $690 per form. Those figures come from the W-2 instructions, so confirm them in the 2026 General Instructions for Certain Information Returns once the IRS releases the final version.

A separate penalty applies to payee statements, so a form filed with the IRS on time but furnished late to the contractor still carries exposure. A missing W-9 or a wrong TIN can lead to an incorrect form, and the checklist deals with both before January.

Splitting Checklist Tasks Between Support Staff and Reviewers

The repeatable parts of 1099 season suit a trained support team. Final judgment calls belong to the firm.

Our post on 1099 outsourcing workflow and automation covers the software side of this split. For the handoff mechanics, the tax software handoff checklist for offshore teams applies to 1099 filing tools as well as return software. Since 1099 work lands at the same time as organizers and engagement letters, it belongs in your tax season outsourcing checklist alongside the rest of January.

Outsourcing helps most when the firm prepares 1099s for many clients and staff spend January chasing W-9s. A firm that files a handful of forms for a few clients may find it simpler to keep the work in house.

Frequently Asked Questions

What should a 1099 checklist for accountants include? It should cover client setup, vendor file review, W-9 collection and TIN validation, payment tie-out to the ledger, threshold and form selection, review and client approval, and filing with record retention. Each stage should have a named owner and a date.

When should accountants start the 1099 checklist? Starting the client list and vendor review in October or November is a sound practice. It leaves time for W-9 requests and TIN Matching before the year closes, so January can go to tie-outs, review and client approval.

When are 1099-NEC forms due for tax year 2026? The rule is January 31, but January 31, 2027 is a Sunday, so the deadline is Monday, February 1, 2027 for both filing with the IRS and furnishing recipient copies.

Do accountants need a W-9 from every vendor? Collecting a W-9 from every U.S. vendor before the first payment is the safest practice, even for corporations. It documents entity type and TIN, supports the decision not to file, and avoids backup withholding problems if payments later cross the threshold.

Which 1099 tasks can support staff handle? Vendor cleanup, W-9 tracking, ledger tie-out and draft preparation can be delegated, while the firm reviewer keeps classification decisions, client compliance conversations, final review and authorization to file.

Next Step

Madras Accountancy supports CPA firms with 1099 preparation, vendor data cleanup, W-9 tracking, payroll and bookkeeping support, with your team keeping review and filing decisions. To plan support for the coming 1099 season, contact our team.