FPC common mistakes
FPC · Understand the traps and how to avoid them.
Classifying a worker as an independent contractor because the company issues a 1099-NEC and the worker agreed to it, without testing the actual working relationship.
Candidates treat the label on the invoice or contract as controlling, and the FPC exam frames the question around behavioral control, financial control, and the type of relationship rather than paperwork.
What to do instead
For each worker fact pattern, apply the common-law factors in order: does the payer control how, when, and where the work is done; who supplies tools and bears profit/loss risk; is there a written contract, benefits, or permanence? Remember some states impose a stricter ABC test for unemployment and wage law while the IRS uses common law for withholding.
Assuming every pre-tax deduction reduces every tax equally - e.g., subtracting a traditional 401(k) deferral from Social Security and Medicare wages, or subtracting a Section 125 health premium from federal income tax wages only.
Textbook summaries often say 'pre-tax reduces taxable wages' without distinguishing which tax bases each deduction touches, and the exam tests code sections rather than generalities.
What to do instead
Memorize deduction-by-tax-base: traditional 401(k)/403(b) deferrals reduce federal income tax and FICA (Social Security and Medicare) wages; Section 125 cafeteria plan health and dependent care premiums generally reduce federal income tax, FICA, and FUTA wages; Roth deferrals reduce nothing. Then check state rules separately because a few states do not follow the federal treatment.
Leaving employer-provided fringe benefits out of taxable wages entirely - treating group term life coverage above $50,000 or personal use of a company car as a nontaxable company expense.
The benefit never appears as a cash payment on the paycheck, so candidates do not think to impute income, and the exam presents these as short scenarios without a dollar figure labelled 'wages'.
What to do instead
For each benefit, ask whether the Code excludes it. Group term life insurance coverage over $50,000 produces imputed income using the IRS Table I rate per $1,000 of coverage per month; personal use of an employer vehicle is imputed using the lease value or cents-per-mile method. Imputed amounts go on the W-2 in Box 1, 3, 5 (as applicable) and Box 12 with the correct code.
Calculating overtime on base hourly rate only when the employee also received a nondiscretionary production bonus or shift differential during the workweek.
The bonus is often paid in a later pay period, so candidates compute overtime at the time it is earned and never go back to restate the regular rate.
What to do instead
Build the FLSA regular rate first: total straight-time earnings for the workweek divided by hours worked, including nondiscretionary bonuses, commissions, shift differentials, and other non-excludable payments. Pay 0.5 times that regular rate for hours over 40. Exclude discretionary bonuses, gifts, expense reimbursements, and paid leave from the regular rate. When a bonus covers multiple weeks, allocate it across the workweeks it covers and recompute.
Treating an exempt employee's salary as untouchable, or alternatively docking pay for partial-day absences and for disciplinary reasons.
Candidates conflate 'exempt from overtime' with 'exempt from all payroll rules' and forget the salary-basis requirement is a separate test from the duties test.
What to do instead
Apply the salary-basis rule: an exempt employee generally must receive the full predetermined salary for any workweek in which they perform any work, with limited exceptions (first/last week, full-day personal absences, FMLA, jury duty, military leave, safety-rule penalties). Full-day deductions for disciplinary suspensions are permitted only under a written policy for infractions of written workplace-conduct rules; partial-day docking is not.
Assigning a monthly deposit schedule without running the look-back period, or missing the $100,000 next-day deposit obligation after a large payroll.
Candidates memorize 'monthly or semiweekly' as a company characteristic rather than a status recalculated every year, and they overlook the one-day trigger because it is an exception to the normal schedule.
What to do instead
Determine depositor status each year from the look-back period: total employment taxes reported in the four quarters ending the prior June 30. At or below $50,000 is monthly; above $50,000 is semiweekly. Separately, if accumulated undeposited taxes reach $100,000 on any day, deposit by the next banking day regardless of schedule, and remain a semiweekly depositor for the rest of that year and the following year.
Applying the Social Security wage base fresh each pay period - withholding 6.2% on every paycheck all year - instead of tracking year-to-date wages against the annual limit.
Each individual payroll calculation looks correct in isolation, and candidates do not carry a running cumulative wage total in multi-period exam questions.
What to do instead
Keep a year-to-date taxable wage register per employee. Each period, tax only the portion of current wages that falls below the annual Social Security wage base (limit minus YTD Social Security wages). Medicare has no wage base, so Medicare withholding continues all year, and the additional Medicare tax of 0.9% applies to wages above the statutory threshold with no employer match.
Computing a gross-up by multiplying net pay by the tax rate, or by adding the tax amount once instead of dividing by one minus the combined rate.
Gross-up runs opposite to the familiar direction of payroll math, and candidates instinctively reach for multiplication because that is how withholding is normally applied.
What to do instead
Use gross = desired net / (1 - combined marginal tax rate). Sum every rate that applies to the payment (federal income tax, Social Security 6.2% up to the wage base, Medicare 1.45%, plus state and local if applicable) before dividing. Then verify by running the withholding back down from the computed gross and confirming the net matches the target.
Using the wrong withholding table for the pay frequency, or applying the supplemental flat rate to regular wages instead of to supplemental wages.
Candidates grab the annual percentage-method table because it is the one they remember, and they lose track of whether a payment is regular or supplemental when a scenario mixes base pay and a bonus.
What to do instead
Match the table to the pay period: annual, semiannual, quarterly, monthly, semimonthly, biweekly, weekly, or daily. Apply the optional flat 22% rate only to supplemental wages (bonuses, commissions, overtime premiums paid separately, severance) that are separately identified; when the employer has not withheld income tax on supplemental wages in the same year, aggregate the supplemental payment with regular wages instead. Remember the mandatory 37% rate on supplemental wages over $1 million in a calendar year.
Completing year-end without reconciling total wages and taxes on the quarterly Forms 941 to the totals that will appear on Forms W-2 and W-3.
Candidates treat quarter-end filing and year-end filing as separate tasks handled by separate people, so they never test whether the two sets of totals agree.
What to do instead
Before issuing W-2s, reconcile: total federal income tax withheld across the four 941s equals W-2 Box 2 totals; total Social Security and Medicare wages and tips on the 941s equal Box 3 and Box 5 totals; deposit liabilities from the 941 Schedule B or the deposit records equal the amounts reported. Investigate any variance, including imputed income, third-party sick pay, and corrected returns, before filing. Also confirm the retention schedule for payroll records supports the filing.