Can You Pay Estimated Taxes Once a Year Instead of Quarterly? (2026)

Yes — if you own an S-Corporation. Under Treasury Regulation § 31.3402(a)-1, W-2 withholding is treated as paid equally throughout the year regardless of when the paycheck is issued. One optimized December paycheck can eliminate all quarterly obligations, cover penalty exposure, and unlock five-figure tax savings.

"If you're in an S-Corp and still making quarterly estimated payments, your W-2 is not being calculated correctly. The regulation allows you to issue one paycheck in December and have the withholding applied as if it had been spread across all four quarters. Most accountants simply don't use this. The cash flow advantage alone is enormous — you're using your capital all year to grow the business, not handing it to the IRS in installments."

— Neal McSpadden, Founder, Tax Sherpa

Key Takeaways

• Treasury Reg § 31.3402(a)-1 allows W-2 withholding to backdate across the full year — eliminating quarterly payment obligations for S-Corp owners
• A single December paycheck can cover 100% of annual federal tax liability, including a spouse's W-2 income
• The Q4 W-2 is also the vehicle to maximize QBI deduction, fund retirement contributions, and establish reasonable compensation — all in one transaction
• This strategy is legal, well-established, and almost always overlooked by general-practice accountants
• Guardrails apply: you must have an S-Corp with a defensible reasonable compensation basis

How Treasury Reg § 31.3402(a)-1 Actually Works

The IRS requires employers to withhold income tax from wages. The regulation governing this process — Treasury Regulation § 31.3402(a)-1 — specifies that W-2 withholding is applied equally across the entire tax year, regardless of when the paycheck is physically issued.

This is not a loophole. It is the mechanics of how W-2 withholding has always worked. When an employer (including an S-Corp where the owner is also the employee) issues a paycheck in December with $82,000 in withholding, the IRS treats that withholding as if it were distributed throughout the year — $20,500 per quarter.

The practical consequence: quarterly estimated payments are not required. The W-2 withholding satisfies the "paid throughout the year" requirement that triggers underpayment penalty protection.

This stands in direct contrast to estimated payments made by a sole proprietor or Schedule C filer, which must actually be received by the IRS on or before each quarterly due date (April 15, June 15, September 15, and January 15) to avoid the underpayment penalty. Miss one, and the penalty accrues for that quarter — no remedy, no catch-up.

With a Q4 W-2, the timing risk is eliminated entirely.

The Q4 W-2 Process: Step by Step

This is not an end-of-year scramble. It is a deliberate planning process that begins in October or November and executes in December. Here is how it works in sequence:

Step 1: Gather Year-to-Date Financials

Pull accurate profit-and-loss through October or November. The books must be current — this optimization is only as good as the data underneath it.

Step 2: Annualize for December

Estimate the final month's revenue and expenses. Add that to year-to-date to project full-year gross profit and net income.

Step 3: Optimize the Salary Figure

The salary figure is not arbitrary. It must clear four parallel tests:

• Reasonable compensation: The IRS requires S-Corp owner-employees to receive a salary commensurate with the services they provide. This is the floor — too low creates audit risk.
• QBI deduction optimization: Under Section 199A, the 20% qualified business income deduction phases down as W-2 wages increase. There is a precise salary figure that maximizes the deduction without eliminating it.
• Retirement contribution capacity: Employee 401(k) deferrals (up to $23,500 for 2026) and employer profit-sharing contributions (up to 25% of W-2 compensation) both require a W-2 to exist. The salary must be sized to support both.
• Total tax minimization: The salary generates FICA (7.65% employee + 7.65% employer share), which is real cost. The optimizer finds the intersection of all four constraints.

Step 4: Calculate Total Household Tax Liability

Include the owner's projected income tax, the spouse's W-2 income, any investment income, and state obligations. This is the number the withholding must cover.

Step 5: Construct the December Paycheck

Issue one paycheck — or at most a small number of paychecks in Q4 — structured so the federal withholding equals the household's total tax liability. The gross paycheck will be larger than it appears. Much of it goes directly to the IRS as withholding. The net deposit to the owner's bank account is often a small fraction of the gross.

Step 6: File the W-2 Through Payroll

The payroll processor files the W-2 and submits the withholding deposits. Done. No quarterly estimated payment vouchers. No EFTPS scheduling. No April 15 panic.

Case Study: The Jewelry Store Owner

This is not a theoretical example. This is a real client engagement.

A jewelry store owner in Atlanta operates as an S-Corporation. Revenue is seasonal — the back half of the year accounts for the majority of annual sales. She had been making quarterly estimated payments for years, which meant handing capital to the IRS during the first three quarters when she needed it most for inventory and operations.

In Q4, the analysis showed she needed approximately $95,000 in total payroll for the year. Her accountant at Tax Sherpa ran the full optimization — reasonable compensation satisfied, QBI deduction maximized, retirement contributions funded at both employee and employer level, and household tax liability (including the spouse's W-2 withholding gap) accounted for.

The result: one paycheck in December.

The $82,000 withholding amount was calculated after factoring in the QBI deduction that the payroll itself made possible. By sizing the salary correctly, the deduction reduced taxable income enough to generate approximately $20,000 in tax savings compared to what she would have owed without the optimization.

The withholding also covered the spouse's under-withholding — a problem that affects nearly every dual-income household (see below). The IRS received a single deposit, applied it as if paid throughout the year, and the underpayment penalty calculation came to zero.

What She Kept by Not Making Quarterly Payments

During the first three quarters, instead of sending estimated payments to the IRS, she used that capital to purchase inventory, fund operations, and finance growth. The opportunity cost of quarterly prepayment — essentially a zero-interest loan to the federal government — was eliminated.

The Spouse W-2 Problem (And Why It Almost Always Goes Unresolved)

When two spouses have W-2 income, the withholding on each job is calculated in isolation. Neither employer knows about the other's income. The result is almost always under-withholding at the household level — sometimes by tens of thousands of dollars — which triggers underpayment penalties or a large balance due in April.

The IRS has tried to solve this for decades. The revised W-4 introduced a household income worksheet specifically designed for dual-income households. The problem: almost nobody knows how to use it, and very few payroll departments walk employees through it correctly.

The Q4 W-2 strategy resolves this automatically. Because the S-Corp owner controls the payroll process, withholding can be sized to cover the household's total liability — including the gap created by the spouse's employer under-withholding. One calculation, one paycheck, total coverage.

Guardrails: When This Strategy Applies

This strategy is not available to everyone. Two conditions must be met:

Condition 1: You Must Operate as an S-Corporation

The mechanics of Treasury Reg § 31.3402(a)-1 apply to W-2 withholding, which only exists when there is an employer-employee relationship. A sole proprietor or Schedule C filer has no W-2 and cannot use this approach. Partnerships without individual S-Corp holding structures are similarly excluded at the federal level.

If you are currently operating as a sole proprietorship or single-member LLC taxed as a disregarded entity, the first step is the entity conversion conversation — this strategy is a downstream benefit of the right structure, not a standalone trick.

Condition 2: Reasonable Compensation Must Be Defensible

The IRS requires that S-Corp owner-employees receive compensation "reasonable" for the services performed. This is enforced through audit, and the IRS has been increasingly active in S-Corp reasonable comp examinations.

The Q4 W-2 must clear this standard. The salary cannot be set purely to minimize FICA or maximize QBI — it must reflect what an arm's-length employer would pay for the same services in the same industry. For most owner-operators, this is a meaningful number — often between $50,000 and $150,000 depending on the role and revenue level.

A W-2 that is either too low (to game payroll taxes) or structured without documented reasonable compensation analysis creates audit risk that eliminates any benefit from the strategy.

What Most Accountants Miss

General-practice accountants who serve business owners often default to the quarterly estimated payment system because it is familiar and simple to administer. The W-4 / W-2 optimization requires knowing Treasury Reg § 31.3402(a)-1, running a multi-variable salary optimization, coordinating payroll timing, and accounting for household-level tax dynamics.

Most tax preparers who see an S-Corp owner simply calculate an approximate salary, run payroll throughout the year, and then tell the client to make quarterly estimated payments for the remainder. The result: the client is paying FICA on payroll AND making estimated payments, with no optimization of QBI, retirement, or withholding timing.

The Q4 W-2 eliminates the estimated payment entirely, generates the QBI deduction at its maximum defensible value, funds the retirement account to its legal limit, and resolves the spousal withholding gap — all in a single year-end transaction.

FAQ

Does this strategy work for S-Corp owners in all states?

Federal estimated payments are eliminated. State treatment varies. Some states conform to the federal withholding mechanics; others require separate estimated payment filings regardless. States with pass-through entity tax (PTET) elections may offer additional options. This must be evaluated state by state.

What if my income is too variable to project in December?

The Q4 process explicitly annualizes from year-to-date data. Because December is the final month, the projection error is minimal — you are estimating one month, not twelve. In practice, the optimization is run conservatively to ensure the withholding at least meets safe harbor thresholds even in a downside scenario.

Can I issue more than one paycheck per year?

Yes. Some S-Corp owners issue quarterly paychecks or monthly payroll to maintain a cleaner compensation history — which also strengthens the reasonable compensation argument. The key insight is that the withholding from any of these checks is applied equally throughout the year regardless of when issued. The Q4-only approach is the most capital-efficient version.

What happens if I've already made quarterly estimated payments?

They become a credit against your tax liability. The W-2 withholding is additive — if you've already paid $20,000 in quarterly estimates and your W-2 covers $70,000 more, your total prepayment is $90,000 toward your liability. In practice, once this structure is in place, most owners stop making quarterly payments entirely in subsequent years.

Need Help With Estimated Tax Planning?

Tax Sherpa helps solopreneurs and small business owners restructure estimated tax payments into a system that works — not a quarterly scramble.

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