Payroll deductions are correct on the day someone sets them up. Then an employee gets married and updates a W-4. Another switches health plans during open enrollment. A garnishment order arrives, runs its course, and should stop, but nobody removes it from the payroll system. A 401(k) contribution percentage gets changed in one place and never makes it to another. None of these is a dramatic failure. Each is an ordinary event that a growing company generates every month, and each is a chance for a deduction to quietly drift out of alignment with what it is actually supposed to be.
Asure published a guide called How to Manage Payroll Deductions, 5 Step-by-Step Procedures for Growing Companies, built around a simple idea: getting mandatory and voluntary deductions right once is not the same as keeping them right as headcount grows. The first four procedures on that page cover how deductions get classified, authorized, and set up correctly in the first place. The fifth is the compliance audit, a systematic quarterly review of every active deduction and employer obligation, designed to catch miswithholding, missing authorizations, or deposit errors before they become penalties. This piece is a full working process for that fifth procedure, written for the Controller or payroll leader who owns the quarterly close and needs something more concrete than "review your deductions."
Why the quarterly close is the right moment to run this
For a Controller or payroll leader, the quarterly close already forces a pause to reconcile the numbers. That makes it the natural checkpoint for a deduction audit too, because the goal is the same one that shows up in how finance and payroll leaders describe a good quarter: clean reconciliation, no surprise agency notices, and audit-ready reporting available on demand instead of assembled under pressure. The alternative is finding out about a deduction problem when an employee disputes a paycheck, an agency sends a notice, or a benefits provider flags a funding gap. By then the error has usually repeated for more than one pay period, and the fix costs more time and more trust than it would have at quarter one.
The risk here is not really "getting deductions wrong." Most companies get deductions right when they set them up. The risk is drift, the slow accumulation of changes that never fully reach every system that depends on them. A quarterly audit is how you catch drift on a schedule, instead of catching it by accident.
What to pull before you start
A useful audit starts with three specific pulls, rather than a general look around the payroll system.
The full active deduction list. Every employee, every active deduction, mandatory and voluntary, current amount, and the date it last changed. This is your baseline.
Signed authorization records. For every voluntary deduction on that list, the underlying authorization: a benefits election, a 401(k) enrollment or change form, a signed voluntary deduction agreement, or the court order or agency instruction behind a mandatory withholding. If a deduction exists, something should exist that authorizes it.
Deposit confirmations for the quarter. Confirmation that withheld amounts, tax deposits, benefits premiums, retirement contributions, and garnishment remittances were actually deposited or remitted, for the correct amount, and on time. Federal payroll tax deposits follow the deposit schedule set out in IRS Publication 15 (irs.gov/publications/p15); benefits premiums, retirement contributions, and garnishment remittances follow the timeline the plan document or receiving agency requires.
This is also where a connected payroll platform earns its keep. When active deductions, signed authorizations, and deposit history all live inside AsureCentral, a payroll leader is not reconstructing the quarter from a payroll export, a benefits spreadsheet, and a folder of scanned forms. The pulls above come from one system instead of three, which is the difference between an audit that takes an afternoon and one that takes a week.
What to check for
With the three pulls in hand, the audit itself comes down to three comparisons.
A withholding that does not match a current W-4 or benefit election. Cross-reference each active deduction against the employee's most recent W-4, benefit election, or plan enrollment. A mismatch usually means an update happened in one place, HR made a change, an employee submitted a new form, an open enrollment election went through, and it never reached payroll.
A deduction with no authorization on file. For every voluntary deduction, confirm a signed authorization actually exists and matches the current amount. A deduction running without a matching, current authorization is not a rounding issue. It is a documentation gap that exposes the company if an employee later disputes the withholding.
A deposit that posted late or for the wrong amount. Compare deposit confirmations against the amount actually withheld and the required timing, the IRS Publication 15 deposit schedule for federal tax deposits, or the plan document or receiving agency's timeline for benefits, retirement, and garnishment remittances. A deposit that is short, late, or simply missing is a different kind of problem than the first two, because it involves money that already left an employee's paycheck and has not yet landed where it is supposed to.
How to prioritize what you find
Not every finding deserves the same response, and treating them all the same is its own kind of risk. Rank findings by what kind of exposure they create, not by how many there are.
A missing authorization is a compliance and documentation risk. There is no signed record proving the employee agreed to the deduction, which is a different category of problem than a math error, closer to a legal and audit-readiness issue than an accounting one. These findings get addressed first.
A withholding mismatch is an accuracy risk. The company has a real record of what changed, an election form or a W-4, but the payroll system was not updated to match it. These are usually correctable in the next pay cycle once identified, with any owed amount trued up and the employee notified.
A deposit timing or amount error is a process risk. It is usually mechanical, a bank holiday, a reporting delay, a manual step someone missed, rather than a sign the company misunderstands its obligations. That does not make it low priority on its own; a deposit error that repeats every quarter is a process that needs to be fixed at the source, rather than treated as an isolated event.
A hypothetical first quarterly audit, and what it might find
Consider a hypothetical: a regional logistics company that grows from roughly forty-five employees to more than a hundred over about two years, adding drivers, warehouse staff, and a second location along the way. Ahead of its Q3 close, its Controller runs a formal deduction audit for the first time, using exactly the process above: pull the active deduction list, pull the signed authorizations, pull the deposit confirmations, then compare.
An audit like this could easily surface three findings. A garnishment order might have been satisfied and closed by the court early in the quarter, but the deduction keeps running for two more pay periods because no one flags the closure to payroll. A warehouse employee might have added a dependent during a qualifying life event, with her health premium changing along with the plan, but the new premium amount never makes it into the payroll system, so she ends up underpaying for two pay periods without knowing it. And a 401(k) contribution for one payroll date might post three days later than the plan's stated timing requires, with no documented reason on file.
None of these findings would be catastrophic on their own. Together, they illustrate something more useful: deduction changes happen in HR conversations and benefits paperwork that do not always reliably reach payroll. That is exactly the kind of pattern a quarterly audit is built to catch before it becomes a bigger problem.
What closing a finding actually looks like
A finding is not closed when it is discovered. It is closed when three things happen.
The error is corrected. The deduction is trued up going forward, and any amount owed is reconciled, an over-withheld employee is refunded, an under-withheld amount is collected with notice, or a corrected deposit is remitted.
The reason it happened is documented. Not just "fixed," but why it happened, a benefit change that did not route to payroll, a form that was signed but never processed, a manual step nobody owned. This record is what makes the audit defensible later, and it is what turns one quarter's findings into next quarter's prevention list.
There is a specific reason to expect it will not repeat. A named process change, rather than a general promise to be more careful. If a benefits change did not reach payroll, who now owns making sure it does, and how. If a deposit posted late, what changed about the process to keep that from happening again next quarter.
A finding that gets corrected but never documented, or documented but never actually fixed at the process level, tends to resurface. The audit is only doing its job if the same finding does not show up again next quarter.
Where AsureCentral, Asure HR Compliance, and AsureWorks fit
The process above works because the three pulls, active deductions, signed authorizations, and deposit confirmations, all live in one place. That is what a connected system like AsureCentral is built to provide: deduction records, authorization documentation, and deposit history in a single environment, so a quarterly audit is a matter of comparing what is already there instead of assembling it from several disconnected sources by hand.
Some findings, especially missing authorizations, carry enough legal and compliance weight that a second, expert set of eyes is worth having. Asure HR Compliance gives a company access to certified HR professionals who can review audit findings alongside internal judgment, rather than leaving every close call about documentation and exposure to whoever happens to be running the audit that quarter.
And for a company that recognizes the value of this discipline but does not want to build and maintain it internally every quarter, AsureWorks is the option to have Asure specialists run the audit process directly as part of managed payroll and HR administration. The company remains the employer of record throughout; Asure specialists take on the recurring execution, not the underlying accountability.
Building the discipline in
A quarterly deduction audit is not a one-time project. It is a recurring discipline, the same four pulls and three checks, run on the same schedule every close, until it becomes as routine as the reconciliation itself. Paired with the other four procedures on the payroll deductions guide from Asure, which cover getting deductions classified and set up correctly from the start, this fifth procedure is what keeps them right as the company keeps growing. Whether that discipline lives inside AsureCentral, gets a second review through Asure HR Compliance, or gets handed to Asure specialists through AsureWorks, the goal is the same one every Controller already knows: no surprises, and nothing that has to be explained after an agency finds it first.
