Somewhere in your payroll records right now, there is probably a check that shouldn’t count and a payment that was never counted. A void that got processed in your bank account but never made it back through payroll. A manual check someone cut in July for a missed commission and promised to “key in later.” A prior-quarter correction that lives in an email thread instead of your payroll system. Individually, these feel like loose ends. Collectively, they are the difference between accurate W-2s and a January full of apologies.
Here’s the uncomfortable math. Your W-2s are built from year-to-date payroll totals, and those totals believe whatever your system was told. Every void that wasn’t reversed overstates someone’s wages. Every manual check that wasn’t recorded understates them. Every adjustment that lives on a sticky note is invisible. The W-2 doesn’t know the difference between a clean year and a messy one. It just prints the numbers.
And the clock is real. 2026 W-2s and 1099-NECs are due to employees and the government by February 1, 2027, since January 31 falls on a Sunday. Between your last December payroll and that deadline sits a short, crowded window where ADP’s year-end processing turns your totals into official tax documents. Adjustments found before your final payroll of the year are routine. Adjustments found after W-2s are produced become corrections, and corrections are a different, more expensive animal.
A voided check is supposed to be a two-sided event: the payment is stopped, and payroll records are reversed so wages and taxes come back out of the year-to-date totals. When only one side happens, typically the bank side, the employee’s W-2 reports wages they never received and taxes that were never truly withheld. That ripples into their personal tax return, your quarterly filings, and your tax deposits.
Manual checks are the mirror image. A check written outside the normal payroll cycle, for a missed payment, a termination, a correction, puts real money in an employee’s hands. If it’s never recorded in the payroll system, the W-2 underreports wages. The employee files a tax return on numbers that don’t match what they were actually paid, and your Form 941 totals don’t match your W-2 totals, which is exactly the kind of mismatch that generates agency notices.
The hunt is less about any single transaction and more about knowing where these things hide. The usual suspects include:
That’s the short list. The complete reconciliation sequence, including the third-party sick pay, relocation, and taxable fringe items that surface every December, is in the Ignite HCM Year-End Checklist (ignitehcm.com/yearend-guide).
The common thread: each category requires comparing two sources that normally never meet, such as your bank activity against your payroll register, or your quarter-end filings against your year-to-date totals. That comparison work is why this takes days in November and weeks in January.
Here’s the detail that turns a small miss into a big one. Your wages aren’t just reported once on the W-2. They were reported all year long on quarterly employment tax returns. When you discover in December that a second-quarter manual check was never recorded, you’re not just fixing a W-2 total. You may be amending a quarterly return, adjusting tax deposits, and reconciling the difference across every report that touched that quarter.
The agencies cross-check these filings against each other. W-2 totals that don’t tie to the sum of your quarterly returns invite notices, and notices invite the kind of correspondence that consumes an entire payroll team’s spring. Finding the discrepancy yourself, now, keeps you in control of the fix. Letting the Social Security Administration find it does not.
Every adjustment has two prices: what it costs before W-2s are produced, and what it costs after. Before, it’s a line in your final payroll run or an adjustment entry, processed quietly, no one the wiser. After, the same error requires a Form W-2c for each affected employee, possibly amended quarterly returns, and an explanation to an employee who may have already filed their personal taxes on the wrong numbers.
That last part is the one that stings. An employee who files early, gets a refund, and then receives a W-2c may have to amend their own return. Now your bookkeeping miss has cost your employee time, possibly money, and definitely confidence. They will read every pay stub skeptically for the next year, and they will tell their coworkers to do the same.
In most organizations, the honest answer to “who reconciles voids and manual checks” is “whoever notices.” That’s the root cause. This is a job that needs one named owner, a deadline ahead of your final 2026 payroll run, and access to both the bank records and the payroll system. In smaller teams that’s the payroll manager with an afternoon blocked off. In larger ones it’s a short project with finance. Either way, the assignment happens in November, because the person who owns it needs time to actually chase down what they find. Naming the owner is the step most companies skip, and it’s the cheapest one on the list.
One more reason November is the right month for this: the people with the answers are still reachable. The manager who arranged that off-cycle check in July can still explain it. The bank statement from the voided payment is still easy to pull. Wait until late January and you’re reconstructing events from memory during the busiest stretch of the payroll year, while the same people you need are buried in W-2 questions. The facts don’t get better with age. They get vaguer, and vaguer facts mean slower, more expensive fixes.
Here’s a version of this we hear every January. During the year, a well-meaning manager arranges a few manual checks for employees who’d been shorted on commissions, handled through accounts payable and never recorded in payroll. Separately, a couple of voided paychecks from a summer termination get reversed at the bank but not in the payroll system.
Nobody looks until W-2s are already in employees’ hands. The fallout follows the same script every time: W-2c forms for the affected employees, an amended quarterly filing, catch-up tax deposits with interest, and an employee or two who already filed personal returns and now has to amend them. The cleanup in professional fees and staff time runs well into five figures, not counting the goodwill spent explaining to employees why their tax documents changed in March. The original errors would have taken perhaps two hours to fix in November.
Smaller teams are often more exposed, not less, because manual checks and voids are handled by one busy person with no second set of eyes. If anyone cut a check outside the normal cycle this year, or voided one, you have something to verify.
Before your final 2026 payroll run processes, ideally. That lets corrections flow through normal processing and land in your year-to-date totals cleanly. After that, you’re into year-end adjustment territory, and after W-2s are produced, you’re into W-2c territory. Each stage is more expensive than the last.
Incorrect W-2s, mismatches between your W-2s and quarterly filings that can trigger agency notices, corrected forms and amended returns, and employees filing personal taxes on wrong numbers. Underpaid taxes also accrue interest while you wait.
Ignite HCM’s consultants spent years inside ADP’s service organization before joining us, and we support ADP clients exclusively, which means we know exactly where unrecorded checks and half-finished voids hide in ADP Workforce Now, and how to get adjustments in cleanly before W-2s lock. No ticket queue, no starting over with a new rep every call. You get a dedicated consultant who sweeps the year with you. We’ve got you.
Year-end is won in November, not January. Grab the free Ignite HCM Year-End Checklist (ignitehcm.com/yearend-guide) — or REQUEST A CONSULTATION (ignitehcm.com/solutions/payroll-processing) and we’ll run it with you.
ADP and the ADP logo are registered trademarks of ADP, Inc. This article is general guidance only, not tax or legal advice. Confirm the treatment of specific adjustments and corrections with your licensed tax advisor.
