In accounting, a true-up is an adjusting journal entry that replaces an estimated amount on the books with the actual, verified figure once the real data is available. Businesses, insurers, and tax authorities work with estimates throughout a reporting period because verified numbers usually aren’t ready when payments have to go out or financial statements have to close. The true-up entry closes the gap, increasing or decreasing the original balance so the books reflect what actually happened.
The Three Steps Behind Every True-Up
Every true-up follows the same pattern, whether it’s a retirement plan match, an insurance premium, or a quarterly tax payment. Someone calculates a provisional figure using projections, historical trends, or incomplete data so that payments and reporting can proceed on schedule. Later, the actual figure emerges once invoices arrive, audits complete, or a policy period ends. Then the accounting team records a correcting entry to close the gap.
The math is simple: actual minus estimate equals the adjustment. Suppose a company accrues $10,000 in expenses for a quarter based on historical patterns, but the actual invoices total $12,000. The true-up entry debits expense for $2,000 and credits the corresponding liability for $2,000. If the actual had come in lower at $8,500, the entry reverses direction, reducing both the expense and the liability by $1,500.
True-ups usually line up with specific milestones: the end of a quarter, the close of a fiscal year, the expiration of an insurance policy, or the filing of an annual tax return. The longer an uncorrected estimate sits on the books, the more it distorts the financial picture downstream.
The 401(k) Match True-Up
This is where most employees first hear the term. Many employers match a portion of what their workers contribute to a 401(k), but the matching calculation happens each pay period rather than once a year. That per-payroll approach creates a problem for anyone who front-loads contributions and hits the annual limit before December.
In 2026, the standard employee contribution limit for a 401(k) is $24,500, with an additional $8,000 in catch-up contributions available for workers age 50 and older (or $11,250 for those turning 60 through 63 that year).1Internal Revenue Service. 2026 Amounts Relating to Retirement Plans and IRAs Say you earn $120,000 a year, paid monthly, and your employer matches dollar-for-dollar up to 5% of pay. Your full-year match potential is $6,000. Spread contributions evenly, and the employer deposits $500 in matching funds each month, so you collect the full $6,000.
Now contribute $4,083 per month instead and hit the $24,500 cap by June. Your contributions drop to zero for the second half of the year. Because the match is calculated each pay period, the employer has nothing to match for July through December, and you’d collect only $3,000 in matching funds. Real money left on the table.
A 401(k) true-up fixes this. After the plan year ends, the employer recalculates total contributions against total compensation for the full year, determines the match you should have received, and deposits the difference. In the example above, the true-up would add $3,000 to the account. Not every plan offers this provision, so check your plan document or ask HR. The compensation taken into account for determining employer contributions is capped at $360,000 in 2026.2Internal Revenue Service. Retirement Topics – 401(k) and Profit-Sharing Plan Contribution Limits
True-Ups in Payroll and Insurance
Sales Commissions
Companies that pay commissions on preliminary bookings face a built-in timing problem. A salesperson closes a deal in March and receives a commission on the booked amount, but the customer returns the product in May or cancels the contract in July. The revenue the commission was based on no longer exists. A true-up recalculates the commission against net revenue after returns and cancellations, and the difference is either deducted from a future commission check or recovered as a chargeback.
Health Insurance Premiums
Employers typically pay health insurance premiums based on projected utilization for the policy year. At year-end, the insurer compares total premiums collected against actual claims and administrative costs. Overpayment produces a refund or a credit toward the next policy year. If claims exceeded projections, the employer owes the deficit. The amounts involved can be meaningful, especially for self-insured or partially self-insured plans where the employer bears more of the claims risk.
Workers’ Compensation Payroll Audits
Workers’ compensation follows the same estimate-then-reconcile pattern, but the variable being trued up is payroll rather than claims. At the start of a policy period, the insurer sets a premium by applying a rate to the employer’s estimated payroll for the coming year. After the policy period ends, the insurer conducts a payroll audit, requesting actual payroll totals broken down by job classification. Higher-than-estimated payroll means additional premium owed; lower payroll means a credit. Classifications matter because a clerical worker and a roofer generate very different premiums per dollar of payroll.
True-Ups in Contracts and Revenue Recognition
Variable Consideration Under ASC 606
When a contract includes volume rebates, performance bonuses, or rights of return, the total price isn’t fixed at signing. Under ASC 606, companies must estimate the amount they expect to receive and recognize revenue based on that estimate. The standard requires updating the estimate at the end of every reporting period as uncertainties resolve. Each update produces a true-up: if the estimated transaction price rises because a performance milestone looks more likely, revenue goes up; if it falls, revenue is reversed. This is an ongoing recalibration, not a year-end task.
Intercompany Transfer Pricing
When related corporate entities transact with each other, they use internal transfer prices for shared services like IT support or HR. Those prices are set provisionally at the start of the year, often based on budgeted costs. At fiscal year-end, the parent company recalculates the actual cost of delivering those services and adjusts the intercompany charges.
Transfer pricing true-ups carry a tax dimension. The IRS requires intercompany transactions to reflect arm’s-length pricing, meaning the price related entities charge each other should approximate what unrelated parties would charge. A company can test its transfer prices after the tax year ends and self-correct on its original, timely filed return (including extensions) if the prices didn’t produce an arm’s-length result.3Internal Revenue Service. Taxpayer’s Affirmative Use of IRC 482 Missing that window can limit the company’s ability to adjust in its own favor, since late-filed or amended returns generally can’t increase intercompany costs.
True-Ups in Tax Accounting
Estimated Tax Payments
The annual tax return is the most familiar true-up most people experience. Throughout the year, individuals and businesses make estimated payments toward their tax liability based on projected income. When the return is filed, total payments are compared against the actual tax owed, producing either a refund or a balance due.
You’re generally required to make quarterly estimated payments if you expect to owe at least $1,000 after subtracting withholding and refundable credits, and you expect those credits to cover less than 90% of your current-year tax or 100% of your prior-year tax.4Internal Revenue Service. Estimated Tax If your adjusted gross income exceeded $150,000 in the prior year ($75,000 if married filing separately), that prior-year safe harbor rises to 110%.5Internal Revenue Service. 2026 Form 1040-ES Estimated Tax for Individuals Fall short and the IRS applies an underpayment penalty for each quarter’s shortfall individually, so even catching up by Q4 won’t erase penalties on earlier quarters.6Office of the Law Revision Counsel. 26 U.S. Code 6654 – Failure by Individual to Pay Estimated Income Tax
Payroll Withholding
Payroll withholding is a true-up system operating in reverse. Instead of the taxpayer estimating a lump sum, the employer withholds income and FICA taxes from each paycheck based on the employee’s Form W-4.7Internal Revenue Service. About Form W-4, Employee’s Withholding Certificate Those withholdings are provisional payments toward the annual tax obligation. At year-end, the employer reports the total on Form W-2, and the employee reconciles that total against actual tax liability at filing. Too much withheld means a refund; too little means a balance due and possibly a penalty. Updating your W-4 after major life changes keeps the provisional figure close to reality.
Inventory and Fixed Asset Adjustments
Book inventory and physical inventory almost never match perfectly. Products get damaged, stolen, miscounted, or lost in a warehouse. A physical count reveals the actual quantity on hand, and the gap between that count and the book balance needs a true-up. The standard entry debits a shrinkage expense (usually housed under cost of goods sold) and credits inventory for the shortfall. If the count turns up more inventory than the books show, the entry reverses. Either way, cost of goods sold shifts, which directly affects reported profit for the period.
Fixed assets follow a similar pattern. Companies maintain a detailed asset register listing every piece of equipment, furniture, vehicle, and property they own, along with cost and accumulated depreciation. Periodic physical verification catches discrepancies: a laptop disposed of but never removed from the books, or equipment replaced but not written off. The true-up entry removes the asset’s remaining book value and accumulated depreciation, with any difference flowing through as a gain or loss on disposal.
Why Getting True-Ups Right Matters
A true-up that’s too small, too late, or missing entirely can escalate from a bookkeeping nuisance to a regulatory problem. For estimated tax true-ups, the IRS charges interest on any shortfall for each quarter it remains unpaid, compounded daily, and the penalty applies even if you’re ultimately owed a refund when you file. For retirement plan true-ups, missing or inaccurate contribution data flows through to the annual Form 5500 filing, where penalties for late or inaccurate returns are substantial.8Internal Revenue Service. 401(k) Plan Fix-It Guide – You Haven’t Filed a Form 5500 This Year For public companies, an uncorrected estimate that recurs across years can accumulate into a material misstatement requiring a restatement of prior-period financial statements.9U.S. Securities & Exchange Commission. SEC Staff Accounting Bulletin No. 99 – Materiality
True-ups are the mechanism that keeps provisional numbers from hardening into permanent errors on financial statements, tax returns, and regulatory filings. Done on schedule, they’re routine housekeeping. Skipped or delayed, they compound into problems that cost far more to fix later.