Payroll Audits: Finding Errors Before They Compound

Most payroll errors are not dramatic. A premium computed on gross pay instead of basic salary, a night differential rate that was never switched on for the graveyard shift, one employee still carrying last year's tax status — none of these announce themselves. They repeat quietly, cutoff after cutoff, until a separated employee questions a final pay computation or an agency asks why a year of contributions is short.

Why small payroll errors get expensive

A payroll system is faithful. Whatever base, rate or schedule you configured, it will apply consistently until someone changes it — which means a single wrong setting is never a single wrong payslip. It is twenty-four of them a year, multiplied by everyone the setting touches.

The cost then grows on its own. Missed employer contributions to PhilHealth carry interest compounded monthly of at least 3% under Section 9 of the Universal Health Care Act. Unremitted Pag-IBIG amounts carry a penalty of 3% per month from the date they fall due, under Section 23(b) of RA 9679. SSS imposes penalties on late employer payments. None of these require anyone to notice the error first; they accrue in the background from the month the obligation was due.

Withholding errors compound differently. They flow into BIR Form 2316 and the annual alphalist, so a mistake found in February is no longer a payroll correction — it is an amended return, a reissued certificate, and an awkward conversation with an employee whose refund just changed.

Give the audit a fixed rhythm

An audit that happens "when there's time" does not happen. Assign it to a named person and give each layer a fixed date on the calendar, the same way the payroll run itself has one.

Four layers cover most risk. Every cutoff, run a five-minute variance check: headcount against the previous run, total gross against the previous run, and any negative net pay, zero-tax employee or unusually large payslip pulled out for a look. Every month, after remittance, reconcile what was deducted against what was actually paid to each agency. Every quarter, review configuration rather than output — contribution tables, rate settings, employee master data, tax status, and the movement of new hires and separations. Every year, run a fuller pass twice: once in November or early December, before 13th month pay is computed, and once in early January, before the BIR deadlines close.

Write the layers down as a checklist. The value of the routine is that it is identical each time, so a variance is visible without anyone having to remember what normal looked like.

Start with the inputs, not the totals

Payroll totals look reasonable long after the inputs stop being correct, so start where the numbers enter. Reconcile timekeeping to the payroll register first: hours worked, overtime, night hours, rest day work and leave, employee by employee for a sample, and in full for anyone whose pay moved sharply.

Then confirm the premium rates the system applies. The Labor Code requires overtime at the regular wage plus at least 25%, a night shift differential of not less than 10% of the regular wage for hours worked between ten in the evening and six in the morning, and at least 30% additional compensation for work on a scheduled rest day. For this year, Proclamation No. 1006 declared ten regular holidays, eight special non-working days and one special working day, and DOLE Labor Advisory No. 12, series of 2025 restates the pay rules — a regular holiday not worked pays 100% of the daily wage, worked pays 200% for the first eight hours, and 200% × 130% when it also falls on a rest day. Check that the holiday calendar loaded into payroll matches the proclamation, including the special working day, which is the one people mis-encode.

In ERPat, the Compensation module is fed straight from attendance, so the item to hunt for is the late correction: an attendance adjustment approved after the cutoff was closed, which belongs in the next run rather than silently in the last one.

Check each statutory deduction against its own base

Each mandatory contribution uses a different base and a different ceiling, and mixing them up is the most common configuration error in Philippine payroll. Audit them separately.

SSS contributions are computed on the Monthly Salary Credit at 15% — 10% employer, 5% employee — with the MSC running from ₱5,000 to ₱35,000 under the January 2025 schedule. PhilHealth premiums are 5% of Monthly Basic Salary only, shared equally between employer and employee, with a ₱10,000 floor and a ₱100,000 ceiling; commissions, overtime pay, allowances, 13th month pay and bonuses are excluded from the base, and so are deductions for tardiness, undertime or leave without pay. Pag-IBIG takes 1% from employees earning not more than ₱1,500 a month and 2% above that, with the employer contributing 2%, computed on a maximum fund salary of ₱10,000 since February 2024 — a ceiling of ₱200 from the member and ₱200 from the employer. That employer counterpart may not be deducted from or recovered from the employee.

For withholding tax, confirm the system is on the revised table effective 1 January 2023, and that 13th month pay and other benefits are treated as exempt only up to ₱90,000 for the year, with the excess taxed as compensation.

Reconcile payroll against the money and the filings

The third check is a three-way tie-out: what the payroll register says was deducted, what actually left the bank, and what was reported on the remittance or return. Gaps between the first two usually mean a timing or posting problem; gaps between the first and third mean someone will eventually receive a notice.

Anchor the reconciliation to the real deadlines. Business employers remit SSS contributions by the last day of the month following the applicable month. PhilHealth employer premiums are paid online through the Electronic Premium Remittance System against the Statement of Premium Account, over-the-counter payments from the employed sector having been discontinued. Pag-IBIG requires employers to remit through an accredited electronic payment and collection facility. Because ERPat's Finance module holds accounts, payments and reconciliation in the same platform as payroll, the disbursement can be matched to the posting rather than tracked in a separate spreadsheet.

If the reconciliation turns up historical gaps in PhilHealth premiums, note the timing: Circular No. 2026-0001 opened a one-time waiver of interest on missed employer contributions for the applicable months July 2013 through December 2024, with requests accepted only until 31 December 2026.

Write down what you checked

An audit that leaves no record is indistinguishable from no audit — both look the same to a DOLE inspector, a BIR examiner and a new payroll officer inheriting the file. Keep a dated worksheet for every pass: the period covered, the items reviewed, the exceptions found, the correction made, and who approved it. ERPat's Compliance module exists for exactly this, holding policy tracking, audit trails and the documentation regulators ask for alongside the payroll it describes.

Tie the annual pass to the dates that already exist. 13th month pay is due not later than December 24 under PD 851, computed as one-twelfth of basic salary earned within the calendar year, and DOLE requires a compliance report through its annual advisory. BIR Form 2316 goes to each employee by January 31, Form 1604-C with the alphalists is filed by January 31, and the duplicate 2316s for employees under substituted filing are submitted to the BIR by February 28.

Make it boring on purpose

The point of a payroll audit routine is not to catch someone. It is to make errors surface within one cycle instead of one year, when a correction is a single adjustment rather than a retroactive remittance with interest. Start with the layer you can actually sustain — the five-minute variance check every cutoff is worth more than an ambitious quarterly review nobody completes. Once the rhythm holds, the audit stops being an event and becomes the least eventful part of the payroll calendar.