In accounting, a true-up is an adjustment that replaces an estimated figure with the actual, verified number once final data is available. It’s recorded as a journal entry that either increases or decreases the original balance so the books reflect what really happened rather than what was projected. Businesses, insurers, and tax authorities lean on estimates throughout a reporting period because verified data rarely arrives in time for payments to go out or financial statements to close. The true-up closes that gap. Employees meet the term most often in 401(k) matching and insurance reconciliations; for businesses, it reaches into revenue recognition, intercompany billing, payroll, and quarterly tax payments.
How a True-Up Works
Every true-up follows the same three steps. Someone calculates a provisional figure from projections, historical trends, or incomplete data. That estimate acts as a placeholder so payments, billing, or reporting can proceed on schedule. The actual figure emerges later, once invoices arrive, audits finish, or a count is done. The accounting team then records a correcting entry for the difference.
Say a company accrues $10,000 of expenses for a quarter based on historical patterns, but the invoices actually total $12,000. The true-up debits the expense account for $2,000 and credits the liability account for $2,000. If the actual had come in lower, at $8,500, the entry reverses direction and reduces both the expense and the liability by $1,500. The math is always the same: actual minus estimate equals the adjustment.
True-ups are usually scheduled to coincide with a milestone — 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 figures that depend on it.
401(k) Matching True-Ups
This is where most employees first run into the term. Many employers match a portion of what workers contribute to a 401(k), but the match is calculated 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 is $24,500, with an additional $8,000 in catch-up contributions for workers age 50 and older.1Internal Revenue Service. 2026 Amounts Relating to Retirement Plans and IRAs Suppose you earn $120,000, 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 across the year and the employer deposits $500 in matching funds each month, giving you the full $6,000.
Now contribute $4,083 per month instead. You hit the $24,500 cap by June, and your contributions drop to zero for the rest of the year. Because the match is calculated each pay period, there’s nothing for the employer to match from July through December. You end up with $3,000 in matching funds instead of $6,000.
A 401(k) true-up fixes this. After the plan year closes, the employer recalculates your total contributions against your total compensation for the full year, works out the match you should have received, and deposits the difference. In the example above, the true-up adds $3,000. Not every employer offers a true-up provision, so check your plan document or ask HR. Compensation taken into account for employer contributions is capped at $360,000 in 2026.2Internal Revenue Service. Retirement Topics – 401(k) and Profit-Sharing Plan Contribution Limits
Payroll and Insurance True-Ups
Sales Commissions
Companies that pay commissions on preliminary sales bookings face a built-in timing problem. A salesperson closes a deal in March and gets paid on the booked amount, but the customer returns the product in May or cancels in July. The revenue the commission was based on no longer exists. The true-up recalculates commission against net revenue after returns and cancellations, with the difference either deducted from a future check or recovered as a chargeback. Some employers apply the adjustment retroactively to the original period; others net it against the current period. Either way, the goal is that commissions paid reflect revenue actually earned.
Health Insurance Premiums
Employers typically pay health insurance premiums based on projected utilization for the policy year. At year-end, the insurer compares premiums collected against actual claims and administrative costs. Overpaid premiums come back as a refund or a credit toward the next policy year. If claims exceeded projections, the employer owes the deficit. These reconciliations can involve meaningful sums, especially for self-insured or partially self-insured plans where the employer carries more of the claims risk.
Workers’ Compensation Audits
Workers’ compensation insurance follows the same estimate-then-reconcile pattern, but the variable being trued up is payroll rather than claims. At the start of the policy period, the insurer multiplies a rate against the employer’s estimated payroll for the coming year. After the policy ends, the insurer audits actual payroll broken down by job classification. Higher actual payroll means additional premium owed; lower payroll produces a credit. Classification matters because different job types carry different risk rates — a clerical worker and a roofer generate very different premiums per dollar of payroll.
Revenue Recognition and Contract True-Ups
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 on that estimate, then update it at the end of every reporting period as uncertainties resolve. Each update produces a true-up: revenue goes up if a performance milestone looks more likely, down if it doesn’t. This isn’t a one-time year-end exercise. It continues until every contingency in the contract settles.
Cost-Plus and Government Contracts
Cost-plus contracts are built around the true-up concept. A contractor bills the client throughout a project using estimated costs plus a markup, then submits actual costs for audit at the end of the project or at scheduled intervals. The client compares estimated billings against audited actuals and either remits the shortfall or receives a refund.
Government contracting adds a formal regulatory layer. Under federal acquisition rules, contractors on cost-reimbursement contracts must submit a final indirect cost rate proposal within six months after their fiscal year ends.3eCFR. 48 CFR 52.216-7 – Allowable Cost and Payment That proposal is the basis for the true-up between provisional billing rates used during the year and the actual indirect rates. Overstated costs can trigger recovery demands or contract disputes.
Intercompany Transfer Pricing
When related corporate entities transact with each other, they use internal transfer prices for shared services like IT or HR. These prices are set provisionally at the start of the year, often from budgeted costs. At fiscal year-end, the parent 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.4Internal 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.
Tax True-Ups
Estimated Tax Payments
The annual tax return is the true-up most people experience personally. Throughout the year, individuals and businesses pay estimated tax 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 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.5Internal 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%.6Internal Revenue Service. 2026 Form 1040-ES Estimated Tax for Individuals Falling short triggers an underpayment penalty at the IRS’s prevailing interest rate, which sits at 7% annually as of early 2026.7Internal Revenue Service. Interest Rates Remain the Same for the First Quarter of 2026 The penalty applies to each quarter’s shortfall individually, so catching up in Q4 doesn’t erase penalties on earlier underpayments.
Payroll Withholding
Payroll withholding is a true-up system running in reverse. Instead of the taxpayer sending in a lump sum, the employer withholds income and FICA taxes from each paycheck based on the employee’s Form W-4.8Internal Revenue Service. About Form W-4, Employee’s Withholding Certificate Those withholdings are provisional payments against the annual tax obligation. At year-end, the employer reports the total on Form W-2, and the employee reconciles it against actual tax liability at filing time. Over-withholding produces a refund; under-withholding produces a balance due and potentially a penalty. Updating your W-4 after major life changes keeps the provisional figure closer to reality.
Inventory and Fixed Asset True-Ups
Physical Inventory Counts
Book inventory and physical inventory almost never match. Products get damaged, stolen, miscounted, or lost in a warehouse. A physical count reveals the actual quantity on hand, and the difference needs a true-up. The standard adjustment debits a shrinkage expense, usually housed under cost of goods sold, and credits the inventory account 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.
Periodic inventory systems face this reconciliation at least once a year. Perpetual systems might rely on cycle counts throughout the year and true up in smaller increments. Persistent shrinkage beyond normal expectations can point to operational problems worth investigating beyond the accounting entry.
Fixed Asset Reconciliation
Fixed assets follow the same pattern. Companies maintain a detailed asset register listing equipment, furniture, vehicles, and property, along with cost and accumulated depreciation. Someone periodically verifies that those assets still exist and remain in service. When the count turns up a discrepancy — a laptop disposed of but never removed from the books, or a piece of equipment replaced but not written off — the register gets a true-up. The entry removes the asset’s remaining book value and accumulated depreciation, with any difference flowing through as a gain or loss on disposal. Skip this reconciliation and asset balances get overstated while depreciation expense gets understated.
When True-Up Errors Create Compliance Problems
A true-up adjustment that’s too small, too late, or missing entirely can shift from a bookkeeping nuisance to a regulatory problem. Materiality isn’t just a numbers question. The SEC has said there’s no bright-line percentage threshold: a quantitatively small misstatement can still be material if it masks a change in earnings trends, turns a loss into a profit, affects loan covenant compliance, or influences management compensation.9U.S. Securities & Exchange Commission. SEC Staff Accounting Bulletin No. 99 – Materiality Immaterial misstatements that recur over several years and accumulate into a material current-year error can require a restatement of prior-period financial statements.
Specific penalties attach to specific true-up failures. Filing a late or inaccurate Form 5500 for a retirement plan, which captures the year-end true-up data for employer contributions, carries an IRS penalty of $250 per day up to $150,000 for returns due after 2019, plus a Department of Labor penalty that can reach $2,529 per day with no cap.10Internal Revenue Service. 401(k) Plan Fix-It Guide – You Haven’t Filed a Form 5500 This Year For estimated tax true-ups, the IRS charges the underpayment rate on any shortfall for each quarter it remains unpaid, compounded daily.11Office of the Law Revision Counsel. 26 U.S. Code 6654 – Failure by Individual to Pay Estimated Income Tax That penalty applies even if you’re ultimately owed a refund when you file.
True-ups aren’t optional housekeeping. They’re the mechanism that keeps provisional numbers from hardening into permanent errors on financial statements, tax returns, and regulatory filings. Done on schedule, they prevent the kind of compounding problems that are far more expensive to fix after the fact.